configure.sh 37.1 KB
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#!/bin/sh
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##
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##  configure.sh
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##
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##  This script is sourced by the main configure script and contains
##  utility functions and other common bits that aren't strictly libvpx
##  related.
##
##  This build system is based in part on the FFmpeg configure script.
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##


#
# Logging / Output Functions
#
die_unknown(){
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  echo "Unknown option \"$1\"."
  echo "See $0 --help for available options."
  clean_temp_files
  exit 1
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}

die() {
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  echo "$@"
  echo
  echo "Configuration failed. This could reflect a misconfiguration of your"
  echo "toolchains, improper options selected, or another problem. If you"
  echo "don't see any useful error messages above, the next step is to look"
  echo "at the configure error log file ($logfile) to determine what"
  echo "configure was trying to do when it died."
  clean_temp_files
  exit 1
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}

log(){
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  echo "$@" >>$logfile
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}

log_file(){
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  log BEGIN $1
  cat -n $1 >>$logfile
  log END $1
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}

log_echo() {
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  echo "$@"
  log "$@"
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}

fwrite () {
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  outfile=$1
  shift
  echo "$@" >> ${outfile}
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}

show_help_pre(){
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  for opt in ${CMDLINE_SELECT}; do
    opt2=`echo $opt | sed -e 's;_;-;g'`
    if enabled $opt; then
      eval "toggle_${opt}=\"--disable-${opt2}\""
    else
      eval "toggle_${opt}=\"--enable-${opt2} \""
    fi
  done
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  cat <<EOF
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Usage: configure [options]
Options:

Build options:
  --help                      print this message
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  --log=yes|no|FILE           file configure log is written to [config.log]
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  --target=TARGET             target platform tuple [generic-gnu]
  --cpu=CPU                   optimize for a specific cpu rather than a family
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  --extra-cflags=ECFLAGS      add ECFLAGS to CFLAGS [$CFLAGS]
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  ${toggle_extra_warnings}    emit harmless warnings (always non-fatal)
  ${toggle_werror}            treat warnings as errors, if possible
                              (not available with all compilers)
  ${toggle_optimizations}     turn on/off compiler optimization flags
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  ${toggle_pic}               turn on/off Position Independent Code
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  ${toggle_ccache}            turn on/off compiler cache
  ${toggle_debug}             enable/disable debug mode
  ${toggle_gprof}             enable/disable gprof profiling instrumentation
  ${toggle_gcov}              enable/disable gcov coverage instrumentation
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  ${toggle_thumb}             enable/disable building arm assembly in thumb mode
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  ${toggle_dependency_tracking}
                              disable to speed up one-time build
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Install options:
  ${toggle_install_docs}      control whether docs are installed
  ${toggle_install_bins}      control whether binaries are installed
  ${toggle_install_libs}      control whether libraries are installed
  ${toggle_install_srcs}      control whether sources are installed


EOF
}

show_help_post(){
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  cat <<EOF
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NOTES:
    Object files are built at the place where configure is launched.

    All boolean options can be negated. The default value is the opposite
    of that shown above. If the option --disable-foo is listed, then
    the default value for foo is enabled.

Supported targets:
EOF
  show_targets ${all_platforms}
  echo
  exit 1
}

show_targets() {
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  while [ -n "$*" ]; do
    if [ "${1%%-*}" = "${2%%-*}" ]; then
      if [ "${2%%-*}" = "${3%%-*}" ]; then
        printf "    %-24s %-24s %-24s\n" "$1" "$2" "$3"
        shift; shift; shift
      else
        printf "    %-24s %-24s\n" "$1" "$2"
        shift; shift
      fi
    else
      printf "    %-24s\n" "$1"
      shift
    fi
  done
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}

show_help() {
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  show_help_pre
  show_help_post
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}

#
# List Processing Functions
#
set_all(){
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  value=$1
  shift
  for var in $*; do
    eval $var=$value
  done
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}

is_in(){
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  value=$1
  shift
  for var in $*; do
    [ $var = $value ] && return 0
  done
  return 1
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}

add_cflags() {
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  CFLAGS="${CFLAGS} $@"
  CXXFLAGS="${CXXFLAGS} $@"
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}

add_cflags_only() {
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  CFLAGS="${CFLAGS} $@"
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}

add_cxxflags_only() {
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  CXXFLAGS="${CXXFLAGS} $@"
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}

add_ldflags() {
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  LDFLAGS="${LDFLAGS} $@"
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}

add_asflags() {
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  ASFLAGS="${ASFLAGS} $@"
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}

add_extralibs() {
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  extralibs="${extralibs} $@"
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}

#
# Boolean Manipulation Functions
#
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enable_feature(){
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  set_all yes $*
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}

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disable_feature(){
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  set_all no $*
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}

enabled(){
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  eval test "x\$$1" = "xyes"
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}

disabled(){
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  eval test "x\$$1" = "xno"
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}

soft_enable() {
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  for var in $*; do
    if ! disabled $var; then
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      enabled $var || log_echo "  enabling $var"
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      enable_feature $var
    fi
  done
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}

soft_disable() {
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  for var in $*; do
    if ! enabled $var; then
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      disabled $var || log_echo "  disabling $var"
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      disable_feature $var
    fi
  done
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}

#
# Text Processing Functions
#
toupper(){
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  echo "$@" | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
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}

tolower(){
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  echo "$@" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz
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}

#
# Temporary File Functions
#
source_path=${0%/*}
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enable_feature source_path_used
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if [ -z "$source_path" ] || [ "$source_path" = "." ]; then
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  source_path="`pwd`"
  disable_feature source_path_used
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fi

if test ! -z "$TMPDIR" ; then
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  TMPDIRx="${TMPDIR}"
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elif test ! -z "$TEMPDIR" ; then
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  TMPDIRx="${TEMPDIR}"
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else
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  TMPDIRx="/tmp"
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fi
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RAND=$(awk 'BEGIN { srand(); printf "%d\n",(rand() * 32768)}')
TMP_H="${TMPDIRx}/vpx-conf-$$-${RAND}.h"
TMP_C="${TMPDIRx}/vpx-conf-$$-${RAND}.c"
TMP_CC="${TMPDIRx}/vpx-conf-$$-${RAND}.cc"
TMP_O="${TMPDIRx}/vpx-conf-$$-${RAND}.o"
TMP_X="${TMPDIRx}/vpx-conf-$$-${RAND}.x"
TMP_ASM="${TMPDIRx}/vpx-conf-$$-${RAND}.asm"
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clean_temp_files() {
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  rm -f ${TMP_C} ${TMP_CC} ${TMP_H} ${TMP_O} ${TMP_X} ${TMP_ASM}
  enabled gcov && rm -f ${TMP_C%.c}.gcno ${TMP_CC%.cc}.gcno
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}

#
# Toolchain Check Functions
#
check_cmd() {
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  enabled external_build && return
  log "$@"
  "$@" >>${logfile} 2>&1
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}

check_cc() {
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  log check_cc "$@"
  cat >${TMP_C}
  log_file ${TMP_C}
  check_cmd ${CC} ${CFLAGS} "$@" -c -o ${TMP_O} ${TMP_C}
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}

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check_cxx() {
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  log check_cxx "$@"
  cat >${TMP_CC}
  log_file ${TMP_CC}
  check_cmd ${CXX} ${CXXFLAGS} "$@" -c -o ${TMP_O} ${TMP_CC}
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}

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check_cpp() {
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  log check_cpp "$@"
  cat > ${TMP_C}
  log_file ${TMP_C}
  check_cmd ${CC} ${CFLAGS} "$@" -E -o ${TMP_O} ${TMP_C}
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}

check_ld() {
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  log check_ld "$@"
  check_cc $@ \
    && check_cmd ${LD} ${LDFLAGS} "$@" -o ${TMP_X} ${TMP_O} ${extralibs}
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}

check_header(){
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  log check_header "$@"
  header=$1
  shift
  var=`echo $header | sed 's/[^A-Za-z0-9_]/_/g'`
  disable_feature $var
  check_cpp "$@" <<EOF && enable_feature $var
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#include "$header"
int x;
EOF
}

check_cflags() {
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 log check_cflags "$@"
 check_cc -Werror "$@" <<EOF
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int x;
EOF
}

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check_cxxflags() {
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  log check_cxxflags "$@"
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  # Catch CFLAGS that trigger CXX warnings
  case "$CXX" in
    *c++-analyzer|*clang++|*g++*)
      check_cxx -Werror "$@" <<EOF
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int x;
EOF
      ;;
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    *)
      check_cxx -Werror "$@" <<EOF
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int x;
EOF
      ;;
    esac
}

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check_add_cflags() {
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  check_cxxflags "$@" && add_cxxflags_only "$@"
  check_cflags "$@" && add_cflags_only "$@"
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}

check_add_asflags() {
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  log add_asflags "$@"
  add_asflags "$@"
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}

check_add_ldflags() {
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  log add_ldflags "$@"
  add_ldflags "$@"
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}

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check_asm_align() {
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  log check_asm_align "$@"
  cat >${TMP_ASM} <<EOF
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section .rodata
align 16
EOF
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  log_file ${TMP_ASM}
  check_cmd ${AS} ${ASFLAGS} -o ${TMP_O} ${TMP_ASM}
  readelf -WS ${TMP_O} >${TMP_X}
  log_file ${TMP_X}
  if ! grep -q '\.rodata .* 16$' ${TMP_X}; then
    die "${AS} ${ASFLAGS} does not support section alignment (nasm <=2.08?)"
  fi
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}

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# tests for -m$1 toggling the feature given in $2. If $2 is empty $1 is used.
check_gcc_machine_option() {
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  opt="$1"
  feature="$2"
  [ -n "$feature" ] || feature="$opt"

  if enabled gcc && ! disabled "$feature" && ! check_cflags "-m$opt"; then
    RTCD_OPTIONS="${RTCD_OPTIONS}--disable-$feature "
  else
    soft_enable "$feature"
  fi
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}

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write_common_config_banner() {
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  print_webm_license config.mk "##" ""
  echo '# This file automatically generated by configure. Do not edit!' >> config.mk
  echo "TOOLCHAIN := ${toolchain}" >> config.mk
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  case ${toolchain} in
    *-linux-rvct)
      echo "ALT_LIBC := ${alt_libc}" >> config.mk
      ;;
  esac
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}

write_common_config_targets() {
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  for t in ${all_targets}; do
    if enabled ${t}; then
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      if enabled child; then
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        fwrite config.mk "ALL_TARGETS += ${t}-${toolchain}"
      else
        fwrite config.mk "ALL_TARGETS += ${t}"
      fi
    fi
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    true;
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  done
  true
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}

write_common_target_config_mk() {
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  saved_CC="${CC}"
  saved_CXX="${CXX}"
  enabled ccache && CC="ccache ${CC}"
  enabled ccache && CXX="ccache ${CXX}"
  print_webm_license $1 "##" ""
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  cat >> $1 << EOF
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# This file automatically generated by configure. Do not edit!
SRC_PATH="$source_path"
SRC_PATH_BARE=$source_path
BUILD_PFX=${BUILD_PFX}
TOOLCHAIN=${toolchain}
ASM_CONVERSION=${asm_conversion_cmd:-${source_path}/build/make/ads2gas.pl}
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GEN_VCPROJ=${gen_vcproj_cmd}
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MSVS_ARCH_DIR=${msvs_arch_dir}
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CC=${CC}
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CXX=${CXX}
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AR=${AR}
LD=${LD}
AS=${AS}
STRIP=${STRIP}
NM=${NM}

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CFLAGS  = ${CFLAGS}
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CXXFLAGS  = ${CXXFLAGS}
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ARFLAGS = -rus\$(if \$(quiet),c,v)
LDFLAGS = ${LDFLAGS}
ASFLAGS = ${ASFLAGS}
extralibs = ${extralibs}
AS_SFX    = ${AS_SFX:-.asm}
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EXE_SFX   = ${EXE_SFX}
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VCPROJ_SFX = ${VCPROJ_SFX}
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RTCD_OPTIONS = ${RTCD_OPTIONS}
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EOF

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  if enabled rvct; then cat >> $1 << EOF
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fmt_deps = sed -e 's;^__image.axf;\${@:.d=.o} \$@;' #hide
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EOF
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  else cat >> $1 << EOF
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fmt_deps = sed -e 's;^\([a-zA-Z0-9_]*\)\.o;\${@:.d=.o} \$@;'
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EOF
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  fi
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  print_config_mk ARCH   "${1}" ${ARCH_LIST}
  print_config_mk HAVE   "${1}" ${HAVE_LIST}
  print_config_mk CONFIG "${1}" ${CONFIG_LIST}
  print_config_mk HAVE   "${1}" gnu_strip
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  enabled msvs && echo "CONFIG_VS_VERSION=${vs_version}" >> "${1}"
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  CC="${saved_CC}"
  CXX="${saved_CXX}"
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}

write_common_target_config_h() {
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  print_webm_license ${TMP_H} "/*" " */"
  cat >> ${TMP_H} << EOF
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/* This file automatically generated by configure. Do not edit! */
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#ifndef VPX_CONFIG_H
#define VPX_CONFIG_H
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#define RESTRICT    ${RESTRICT}
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#define INLINE      ${INLINE}
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EOF
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  print_config_h ARCH   "${TMP_H}" ${ARCH_LIST}
  print_config_h HAVE   "${TMP_H}" ${HAVE_LIST}
  print_config_h CONFIG "${TMP_H}" ${CONFIG_LIST}
  print_config_vars_h   "${TMP_H}" ${VAR_LIST}
  echo "#endif /* VPX_CONFIG_H */" >> ${TMP_H}
  mkdir -p `dirname "$1"`
  cmp "$1" ${TMP_H} >/dev/null 2>&1 || mv ${TMP_H} "$1"
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}

process_common_cmdline() {
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  for opt in "$@"; do
    optval="${opt#*=}"
    case "$opt" in
      --child)
        enable_feature child
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        ;;
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      --log*)
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        logging="$optval"
        if ! disabled logging ; then
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          enabled logging || logfile="$logging"
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        else
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          logfile=/dev/null
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        fi
        ;;
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      --target=*)
        toolchain="${toolchain:-${optval}}"
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        ;;
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      --force-target=*)
        toolchain="${toolchain:-${optval}}"
        enable_feature force_toolchain
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        ;;
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      --cpu=*)
        tune_cpu="$optval"
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        ;;
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      --extra-cflags=*)
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        extra_cflags="${optval}"
        ;;
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      --enable-?*|--disable-?*)
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        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
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        if echo "${ARCH_EXT_LIST}" | grep "^ *$option\$" >/dev/null; then
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          [ $action = "disable" ] && RTCD_OPTIONS="${RTCD_OPTIONS}--disable-${option} "
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        elif [ $action = "disable" ] && ! disabled $option ; then
          echo "${CMDLINE_SELECT}" | grep "^ *$option\$" >/dev/null ||
            die_unknown $opt
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          log_echo "  disabling $option"
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        elif [ $action = "enable" ] && ! enabled $option ; then
          echo "${CMDLINE_SELECT}" | grep "^ *$option\$" >/dev/null ||
            die_unknown $opt
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          log_echo "  enabling $option"
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        fi
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        ${action}_feature $option
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        ;;
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      --require-?*)
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        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
        if echo "${ARCH_EXT_LIST}" none | grep "^ *$option\$" >/dev/null; then
            RTCD_OPTIONS="${RTCD_OPTIONS}${opt} "
        else
            die_unknown $opt
        fi
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        ;;
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      --force-enable-?*|--force-disable-?*)
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        eval `echo "$opt" | sed 's/--force-/action=/;s/-/ option=/;s/-/_/g'`
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        ${action}_feature $option
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        ;;
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      --libc=*)
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        [ -d "${optval}" ] || die "Not a directory: ${optval}"
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        disable_feature builtin_libc
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        alt_libc="${optval}"
        ;;
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      --as=*)
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        [ "${optval}" = yasm ] || [ "${optval}" = nasm ] \
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          || [ "${optval}" = auto ] \
          || die "Must be yasm, nasm or auto: ${optval}"
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        alt_as="${optval}"
        ;;
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      --size-limit=*)
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        w="${optval%%x*}"
        h="${optval##*x}"
        VAR_LIST="DECODE_WIDTH_LIMIT ${w} DECODE_HEIGHT_LIMIT ${h}"
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        [ ${w} -gt 0 ] && [ ${h} -gt 0 ] || die "Invalid size-limit: too small."
        [ ${w} -lt 65536 ] && [ ${h} -lt 65536 ] \
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            || die "Invalid size-limit: too big."
        enable_feature size_limit
        ;;
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      --prefix=*)
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        prefix="${optval}"
        ;;
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      --libdir=*)
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        libdir="${optval}"
        ;;
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      --sdk-path=*)
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        [ -d "${optval}" ] || die "Not a directory: ${optval}"
        sdk_path="${optval}"
        ;;
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      --libc|--as|--prefix|--libdir|--sdk-path)
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        die "Option ${opt} requires argument"
        ;;
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      --help|-h)
        show_help
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        ;;
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      *)
        die_unknown $opt
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        ;;
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    esac
  done
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}

process_cmdline() {
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  for opt do
    optval="${opt#*=}"
    case "$opt" in
      *)
        process_common_cmdline $opt
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        ;;
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    esac
  done
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}

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post_process_common_cmdline() {
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  prefix="${prefix:-/usr/local}"
  prefix="${prefix%/}"
  libdir="${libdir:-${prefix}/lib}"
  libdir="${libdir%/}"
  if [ "${libdir#${prefix}}" = "${libdir}" ]; then
    die "Libdir ${libdir} must be a subdirectory of ${prefix}"
  fi
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}

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post_process_cmdline() {
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  true;
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}

setup_gnu_toolchain() {
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  CC=${CC:-${CROSS}gcc}
  CXX=${CXX:-${CROSS}g++}
  AR=${AR:-${CROSS}ar}
  LD=${LD:-${CROSS}${link_with_cc:-ld}}
  AS=${AS:-${CROSS}as}
  STRIP=${STRIP:-${CROSS}strip}
  NM=${NM:-${CROSS}nm}
  AS_SFX=.s
  EXE_SFX=
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}

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# Reliably find the newest available Darwin SDKs. (Older versions of
# xcrun don't support --show-sdk-path.)
show_darwin_sdk_path() {
  xcrun --sdk $1 --show-sdk-path 2>/dev/null ||
    xcodebuild -sdk $1 -version Path 2>/dev/null
}

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process_common_toolchain() {
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  if [ -z "$toolchain" ]; then
    gcctarget="${CHOST:-$(gcc -dumpmachine 2> /dev/null)}"
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    # detect tgt_isa
    case "$gcctarget" in
      armv6*)
        tgt_isa=armv6
        ;;
      armv7*-hardfloat*)
        tgt_isa=armv7
        float_abi=hard
        ;;
      armv7*)
        tgt_isa=armv7
        float_abi=softfp
        ;;
      *x86_64*|*amd64*)
        tgt_isa=x86_64
        ;;
      *i[3456]86*)
        tgt_isa=x86
        ;;
      *sparc*)
        tgt_isa=sparc
        ;;
    esac
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    # detect tgt_os
    case "$gcctarget" in
      *darwin10*)
        tgt_isa=x86_64
        tgt_os=darwin10
        ;;
      *darwin11*)
        tgt_isa=x86_64
        tgt_os=darwin11
        ;;
      *darwin12*)
        tgt_isa=x86_64
        tgt_os=darwin12
        ;;
      *darwin13*)
        tgt_isa=x86_64
        tgt_os=darwin13
        ;;
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      *darwin14*)
        tgt_isa=x86_64
        tgt_os=darwin14
        ;;
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      x86_64*mingw32*)
        tgt_os=win64
        ;;
      *mingw32*|*cygwin*)
        [ -z "$tgt_isa" ] && tgt_isa=x86
        tgt_os=win32
        ;;
      *linux*|*bsd*)
        tgt_os=linux
        ;;
      *solaris2.10)
        tgt_os=solaris
        ;;
      *os2*)
        tgt_os=os2
        ;;
    esac
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    if [ -n "$tgt_isa" ] && [ -n "$tgt_os" ]; then
      toolchain=${tgt_isa}-${tgt_os}-gcc
    fi
  fi
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  toolchain=${toolchain:-generic-gnu}
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  is_in ${toolchain} ${all_platforms} || enabled force_toolchain \
    || die "Unrecognized toolchain '${toolchain}'"
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  enabled child || log_echo "Configuring for target '${toolchain}'"
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  #
  # Set up toolchain variables
  #
  tgt_isa=$(echo ${toolchain} | awk 'BEGIN{FS="-"}{print $1}')
  tgt_os=$(echo ${toolchain} | awk 'BEGIN{FS="-"}{print $2}')
  tgt_cc=$(echo ${toolchain} | awk 'BEGIN{FS="-"}{print $3}')
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  # Mark the specific ISA requested as enabled
  soft_enable ${tgt_isa}
  enable_feature ${tgt_os}
  enable_feature ${tgt_cc}
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  # Enable the architecture family
  case ${tgt_isa} in
    arm*)
      enable_feature arm
      ;;
    mips*)
      enable_feature mips
      ;;
  esac

  # PIC is probably what we want when building shared libs
  enabled shared && soft_enable pic

  # Minimum iOS version for all target platforms (darwin and iphonesimulator).
  IOS_VERSION_MIN="6.0"

  # Handle darwin variants. Newer SDKs allow targeting older
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  # platforms, so use the newest one available.
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  case ${toolchain} in
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    arm*-darwin*)
      ios_sdk_dir="$(show_darwin_sdk_path iphoneos)"
      if [ -d "${ios_sdk_dir}" ]; then
        add_cflags  "-isysroot ${ios_sdk_dir}"
        add_ldflags "-isysroot ${ios_sdk_dir}"
      fi
      ;;
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    *-darwin*)
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      osx_sdk_dir="$(show_darwin_sdk_path macosx)"
      if [ -d "${osx_sdk_dir}" ]; then
        add_cflags  "-isysroot ${osx_sdk_dir}"
        add_ldflags "-isysroot ${osx_sdk_dir}"
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      fi
      ;;
  esac
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  case ${toolchain} in
    *-darwin8-*)
      add_cflags  "-mmacosx-version-min=10.4"
      add_ldflags "-mmacosx-version-min=10.4"
      ;;
    *-darwin9-*)
      add_cflags  "-mmacosx-version-min=10.5"
      add_ldflags "-mmacosx-version-min=10.5"
      ;;
    *-darwin10-*)
      add_cflags  "-mmacosx-version-min=10.6"
      add_ldflags "-mmacosx-version-min=10.6"
      ;;
    *-darwin11-*)
      add_cflags  "-mmacosx-version-min=10.7"
      add_ldflags "-mmacosx-version-min=10.7"
      ;;
    *-darwin12-*)
      add_cflags  "-mmacosx-version-min=10.8"
      add_ldflags "-mmacosx-version-min=10.8"
      ;;
    *-darwin13-*)
      add_cflags  "-mmacosx-version-min=10.9"
      add_ldflags "-mmacosx-version-min=10.9"
      ;;
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    *-darwin14-*)
      add_cflags  "-mmacosx-version-min=10.10"
      add_ldflags "-mmacosx-version-min=10.10"
      ;;
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    *-iphonesimulator-*)
      add_cflags  "-miphoneos-version-min=${IOS_VERSION_MIN}"
      add_ldflags "-miphoneos-version-min=${IOS_VERSION_MIN}"
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      iossim_sdk_dir="$(show_darwin_sdk_path iphonesimulator)"
      if [ -d "${iossim_sdk_dir}" ]; then
        add_cflags  "-isysroot ${iossim_sdk_dir}"
        add_ldflags "-isysroot ${iossim_sdk_dir}"
      fi
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      ;;
  esac
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  # Handle Solaris variants. Solaris 10 needs -lposix4
  case ${toolchain} in
    sparc-solaris-*)
      add_extralibs -lposix4
      ;;
    *-solaris-*)
      add_extralibs -lposix4
      ;;
  esac
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  # Process ARM architecture variants
  case ${toolchain} in
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    arm*)
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      # on arm, isa versions are supersets
      case ${tgt_isa} in
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        arm64|armv8)
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          soft_enable neon
          ;;
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        armv7|armv7s)
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          soft_enable neon
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          # Only enable neon_asm when neon is also enabled.
          enabled neon && soft_enable neon_asm
          # If someone tries to force it through, die.
          if disabled neon && enabled neon_asm; then
            die "Disabling neon while keeping neon-asm is not supported"
          fi
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          case ${toolchain} in
            *-darwin*)
              # Neon is guaranteed on iOS 6+ devices, while old media extensions
              # no longer assemble with iOS 9 SDK
              ;;
            *)
              soft_enable media
          esac
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          ;;
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        armv6)
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          soft_enable media
          ;;
      esac
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      asm_conversion_cmd="cat"
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      case ${tgt_cc} in
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        gcc)
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          CROSS=${CROSS:-arm-none-linux-gnueabi-}
          link_with_cc=gcc
          setup_gnu_toolchain
          arch_int=${tgt_isa##armv}
          arch_int=${arch_int%%te}
          check_add_asflags --defsym ARCHITECTURE=${arch_int}
          tune_cflags="-mtune="
          if [ ${tgt_isa} = "armv7" ] || [ ${tgt_isa} = "armv7s" ]; then
            if [ -z "${float_abi}" ]; then
              check_cpp <<EOF && float_abi=hard || float_abi=softfp
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#ifndef __ARM_PCS_VFP
#error "not hardfp"
#endif
EOF
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            fi
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            check_add_cflags  -march=armv7-a -mfloat-abi=${float_abi}
            check_add_asflags -march=armv7-a -mfloat-abi=${float_abi}
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            if enabled neon || enabled neon_asm; then
              check_add_cflags -mfpu=neon #-ftree-vectorize
              check_add_asflags -mfpu=neon
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            fi
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          else
            check_add_cflags -march=${tgt_isa}
            check_add_asflags -march=${tgt_isa}
          fi

          enabled debug && add_asflags -g
          asm_conversion_cmd="${source_path}/build/make/ads2gas.pl"
          if enabled thumb; then
            asm_conversion_cmd="$asm_conversion_cmd -thumb"
            check_add_cflags -mthumb
            check_add_asflags -mthumb -mimplicit-it=always
          fi
          ;;
        vs*)
          asm_conversion_cmd="${source_path}/build/make/ads2armasm_ms.pl"
          AS_SFX=.s
          msvs_arch_dir=arm-msvs
          disable_feature multithread
          disable_feature unit_tests
          vs_version=${tgt_cc##vs}
          if [ $vs_version -ge 12 ]; then
            # MSVC 2013 doesn't allow doing plain .exe projects for ARM,
            # only "AppContainerApplication" which requires an AppxManifest.
            # Therefore disable the examples, just build the library.
            disable_feature examples
          fi
          ;;
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        rvct)
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          CC=armcc
          AR=armar
          AS=armasm
          LD="${source_path}/build/make/armlink_adapter.sh"
          STRIP=arm-none-linux-gnueabi-strip
          NM=arm-none-linux-gnueabi-nm
          tune_cflags="--cpu="
          tune_asflags="--cpu="
          if [ -z "${tune_cpu}" ]; then
            if [ ${tgt_isa} = "armv7" ]; then
              if enabled neon || enabled neon_asm
              then
                check_add_cflags --fpu=softvfp+vfpv3
                check_add_asflags --fpu=softvfp+vfpv3
              fi
              check_add_cflags --cpu=Cortex-A8
              check_add_asflags --cpu=Cortex-A8
            else
              check_add_cflags --cpu=${tgt_isa##armv}
              check_add_asflags --cpu=${tgt_isa##armv}
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            fi
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          fi
          arch_int=${tgt_isa##armv}
          arch_int=${arch_int%%te}
          check_add_asflags --pd "\"ARCHITECTURE SETA ${arch_int}\""
          enabled debug && add_asflags -g
          add_cflags --gnu
          add_cflags --enum_is_int
          add_cflags --wchar32
          ;;
      esac
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      case ${tgt_os} in
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        none*)
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          disable_feature multithread
          disable_feature os_support
          ;;
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        android*)
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          SDK_PATH=${sdk_path}
          COMPILER_LOCATION=`find "${SDK_PATH}" \
                             -name "arm-linux-androideabi-gcc*" -print -quit`
          TOOLCHAIN_PATH=${COMPILER_LOCATION%/*}/arm-linux-androideabi-
          CC=${TOOLCHAIN_PATH}gcc
          CXX=${TOOLCHAIN_PATH}g++
          AR=${TOOLCHAIN_PATH}ar
          LD=${TOOLCHAIN_PATH}gcc
          AS=${TOOLCHAIN_PATH}as
          STRIP=${TOOLCHAIN_PATH}strip
          NM=${TOOLCHAIN_PATH}nm

          if [ -z "${alt_libc}" ]; then
            alt_libc=`find "${SDK_PATH}" -name arch-arm -print | \
              awk '{n = split($0,a,"/"); \
                split(a[n-1],b,"-"); \
                print $0 " " b[2]}' | \
                sort -g -k 2 | \
                awk '{ print $1 }' | tail -1`
          fi

          add_cflags "--sysroot=${alt_libc}"
          add_ldflags "--sysroot=${alt_libc}"

          # linker flag that routes around a CPU bug in some
          # Cortex-A8 implementations (NDK Dev Guide)
          add_ldflags "-Wl,--fix-cortex-a8"

          enable_feature pic
          soft_enable realtime_only
          if [ ${tgt_isa} = "armv7" ]; then
            soft_enable runtime_cpu_detect
          fi
          if enabled runtime_cpu_detect; then
            add_cflags "-I${SDK_PATH}/sources/android/cpufeatures"
          fi
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          ;;

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        darwin*)
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          XCRUN_FIND="xcrun --sdk iphoneos --find"
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          CXX="$(${XCRUN_FIND} clang++)"
          CC="$(${XCRUN_FIND} clang)"
          AR="$(${XCRUN_FIND} ar)"
          AS="$(${XCRUN_FIND} as)"
          STRIP="$(${XCRUN_FIND} strip)"
          NM="$(${XCRUN_FIND} nm)"
          RANLIB="$(${XCRUN_FIND} ranlib)"
          AS_SFX=.s

          # Special handling of ld for armv6 because libclang_rt.ios.a does
          # not contain armv6 support in Apple's clang package:
          #   Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn).
          # TODO(tomfinegan): Remove this. Our minimum iOS version (6.0)
          # renders support for armv6 unnecessary because the 3GS and up
          # support neon.
          if [ "${tgt_isa}" = "armv6" ]; then
            LD="$(${XCRUN_FIND} ld)"
          else
            LD="${CXX:-$(${XCRUN_FIND} ld)}"
          fi

          # ASFLAGS is written here instead of using check_add_asflags
          # because we need to overwrite all of ASFLAGS and purge the
          # options that were put in above
          ASFLAGS="-arch ${tgt_isa} -g"

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          add_cflags -arch ${tgt_isa}
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          add_ldflags -arch ${tgt_isa}

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          alt_libc="$(show_darwin_sdk_path iphoneos)"
          if [ -d "${alt_libc}" ]; then
            add_cflags -isysroot ${alt_libc}
          fi

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          if [ "${LD}" = "${CXX}" ]; then
            add_ldflags -miphoneos-version-min="${IOS_VERSION_MIN}"
          else
            add_ldflags -ios_version_min "${IOS_VERSION_MIN}"
          fi

          for d in lib usr/lib usr/lib/system; do
            try_dir="${alt_libc}/${d}"
            [ -d "${try_dir}" ] && add_ldflags -L"${try_dir}"
          done

          asm_conversion_cmd="${source_path}/build/make/ads2gas_apple.pl"
          ;;
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        linux*)
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          enable_feature linux
          if enabled rvct; then
            # Check if we have CodeSourcery GCC in PATH. Needed for
            # libraries
            hash arm-none-linux-gnueabi-gcc 2>&- || \
              die "Couldn't find CodeSourcery GCC from PATH"

            # Use armcc as a linker to enable translation of
            # some gcc specific options such as -lm and -lpthread.
            LD="armcc --translate_gcc"

            # create configuration file (uses path to CodeSourcery GCC)
            armcc --arm_linux_configure --arm_linux_config_file=arm_linux.cfg

            add_cflags --arm_linux_paths --arm_linux_config_file=arm_linux.cfg
            add_asflags --no_hide_all --apcs=/interwork
            add_ldflags --arm_linux_paths --arm_linux_config_file=arm_linux.cfg
            enabled pic && add_cflags --apcs=/fpic
            enabled pic && add_asflags --apcs=/fpic
            enabled shared && add_cflags --shared
          fi
          ;;
      esac
      ;;
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    mips*)
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      link_with_cc=gcc
      setup_gnu_toolchain
      tune_cflags="-mtune="
      if enabled dspr2; then
        check_add_cflags -mips32r2 -mdspr2
      fi
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      if enabled runtime_cpu_detect; then
        disable_feature runtime_cpu_detect
      fi

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      if [ -n "${tune_cpu}" ]; then
        case ${tune_cpu} in
          p5600)
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            check_add_cflags -mips32r5 -funroll-loops -mload-store-pairs
            check_add_cflags -msched-weight -mhard-float -mfp64
            check_add_asflags -mips32r5 -mhard-float -mfp64
            check_add_ldflags -mfp64
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            ;;
          i6400)
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            check_add_cflags -mips64r6 -mabi=64 -funroll-loops -msched-weight 
            check_add_cflags  -mload-store-pairs -mhard-float -mfp64
            check_add_asflags -mips64r6 -mabi=64 -mhard-float -mfp64
            check_add_ldflags -mips64r6 -mabi=64 -mfp64
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            ;;
        esac

        if enabled msa; then
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          add_cflags -mmsa
          add_asflags -mmsa
          add_ldflags -mmsa
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        fi
      fi

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      check_add_cflags -march=${tgt_isa}
      check_add_asflags -march=${tgt_isa}
      check_add_asflags -KPIC
      ;;
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    x86*)
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      case  ${tgt_os} in
        win*)
          enabled gcc && add_cflags -fno-common
          ;;
        solaris*)
          CC=${CC:-${CROSS}gcc}
          CXX=${CXX:-${CROSS}g++}
          LD=${LD:-${CROSS}gcc}
          CROSS=${CROSS:-g}
          ;;
        os2)
          AS=${AS:-nasm}
          ;;
      esac

      AS="${alt_as:-${AS:-auto}}"
      case  ${tgt_cc} in
        icc*)
          CC=${CC:-icc}
          LD=${LD:-icc}
          setup_gnu_toolchain
          add_cflags -use-msasm  # remove -use-msasm too?
          # add -no-intel-extensions to suppress warning #10237
          # refer to http://software.intel.com/en-us/forums/topic/280199
          add_ldflags -i-static -no-intel-extensions
          enabled x86_64 && add_cflags -ipo -static -O3 -no-prec-div
          enabled x86_64 && AR=xiar
          case ${tune_cpu} in
            atom*)
              tune_cflags="-x"
              tune_cpu="SSE3_ATOM"
              ;;
            *)
              tune_cflags="-march="
              ;;
          esac
          ;;
        gcc*)
          link_with_cc=gcc
          tune_cflags="-march="
          setup_gnu_toolchain
          #for 32 bit x86 builds, -O3 did not turn on this flag
          enabled optimizations && disabled gprof && check_add_cflags -fomit-frame-pointer
          ;;
        vs*)
          # When building with Microsoft Visual Studio the assembler is
          # invoked directly. Checking at configure time is unnecessary.
          # Skip the check by setting AS arbitrarily
          AS=msvs
          msvs_arch_dir=x86-msvs
          vc_version=${tgt_cc##vs}
          case $vc_version in
            7|8|9|10)
              echo "${tgt_cc} does not support avx/avx2, disabling....."
              RTCD_OPTIONS="${RTCD_OPTIONS}--disable-avx --disable-avx2 "
              soft_disable avx
              soft_disable avx2
              ;;
          esac
          ;;
      esac

      bits=32
      enabled x86_64 && bits=64
      check_cpp <<EOF && bits=x32
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#if !defined(__ILP32__) || !defined(__x86_64__)
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#error "not x32"
#endif
EOF
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      case ${tgt_cc} in
        gcc*)
          add_cflags -m${bits}
          add_ldflags -m${bits}
          ;;
      esac

      soft_enable runtime_cpu_detect
      # We can't use 'check_cflags' until the compiler is configured and CC is
      # populated.
      check_gcc_machine_option mmx
      check_gcc_machine_option sse
      check_gcc_machine_option sse2
      check_gcc_machine_option sse3
      check_gcc_machine_option ssse3
      check_gcc_machine_option sse4 sse4_1
      check_gcc_machine_option avx
      check_gcc_machine_option avx2

      case "${AS}" in
        auto|"")
          which nasm >/dev/null 2>&1 && AS=nasm
          which yasm >/dev/null 2>&1 && AS=yasm
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          if [ "${AS}" = nasm ] ; then
            # Apple ships version 0.98 of nasm through at least Xcode 6. Revisit
            # this check if they start shipping a compatible version.
            apple=`nasm -v | grep "Apple"`
            [ -n "${apple}" ] \
              && echo "Unsupported version of nasm: ${apple}" \
              && AS=""
          fi
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          [ "${AS}" = auto ] || [ -z "${AS}" ] \
            && die "Neither yasm nor nasm have been found"
          ;;
      esac
      log_echo "  using $AS"
      [ "${AS##*/}" = nasm ] && add_asflags -Ox
      AS_SFX=.asm
      case  ${tgt_os} in
        win32)
          add_asflags -f win32
          enabled debug && add_asflags -g cv8
          EXE_SFX=.exe
          ;;
        win64)
          add_asflags -f x64
          enabled debug && add_asflags -g cv8
          EXE_SFX=.exe
          ;;
        linux*|solaris*|android*)
          add_asflags -f elf${bits}
          enabled debug && [ "${AS}" = yasm ] && add_asflags -g dwarf2
          enabled debug && [ "${AS}" = nasm ] && add_asflags -g
          [ "${AS##*/}" = nasm ] && check_asm_align
          ;;
        darwin*)
          add_asflags -f macho${bits}
          enabled x86 && darwin_arch="-arch i386" || darwin_arch="-arch x86_64"
          add_cflags  ${darwin_arch}
          add_ldflags ${darwin_arch}
          # -mdynamic-no-pic is still a bit of voodoo -- it was required at
          # one time, but does not seem to be now, and it breaks some of the
          # code that still relies on inline assembly.
          # enabled icc && ! enabled pic && add_cflags -fno-pic -mdynamic-no-pic
          enabled icc && ! enabled pic && add_cflags -fno-pic
          ;;
        iphonesimulator)
          add_asflags -f macho${bits}
          enabled x86 && sim_arch="-arch i386" || sim_arch="-arch x86_64"
          add_cflags  ${sim_arch}
          add_ldflags ${sim_arch}
          ;;
        os2)
          add_asflags -f aout
          enabled debug && add_asflags -g
          EXE_SFX=.exe
          ;;
        *)
          log "Warning: Unknown os $tgt_os while setting up $AS flags"
          ;;
      esac
      ;;
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    *-gcc|generic-gnu)
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      link_with_cc=gcc
      enable_feature gcc
      setup_gnu_toolchain
      ;;
  esac
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  # Try to enable CPU specific tuning
  if [ -n "${tune_cpu}" ]; then
    if [ -n "${tune_cflags}" ]; then
      check_add_cflags ${tune_cflags}${tune_cpu} || \
        die "Requested CPU '${tune_cpu}' not supported by compiler"
    fi
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    if [ -n "${tune_asflags}" ]; then
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      check_add_asflags ${tune_asflags}${tune_cpu} || \
        die "Requested CPU '${tune_cpu}' not supported by assembler"
    fi
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    if [ -z "${tune_cflags}${tune_asflags}" ]; then
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      log_echo "Warning: CPU tuning not supported by this toolchain"
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    fi
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  fi

  if enabled debug; then
    check_add_cflags -g && check_add_ldflags -g
  else
    check_add_cflags -DNDEBUG
  fi

  enabled gprof && check_add_cflags -pg && check_add_ldflags -pg
  enabled gcov &&
    check_add_cflags -fprofile-arcs -ftest-coverage &&
    check_add_ldflags -fprofile-arcs -ftest-coverage

  if enabled optimizations; then
    if enabled rvct; then
      enabled small && check_add_cflags -Ospace || check_add_cflags -Otime
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    else
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      enabled small && check_add_cflags -O2 ||  check_add_cflags -O3
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    fi