configure.sh 40.8 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
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##  utility functions and other common bits that aren't strictly libaom
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##  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 [$CFLAGS]
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  --extra-cxxflags=ECXXFLAGS  add ECXXFLAGS to CXXFLAGS [$CXXFLAGS]
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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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}

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enable_codec(){
  enabled "${1}" || echo "  enabling ${1}"
  enable_feature "${1}"

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  is_in "${1}" av1 && enable_feature "${1}_encoder" "${1}_decoder"
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}

disable_codec(){
  disabled "${1}" || echo "  disabling ${1}"
  disable_feature "${1}"

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  is_in "${1}" av1 && disable_feature "${1}_encoder" "${1}_decoder"
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}

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# Iterates through positional parameters, checks to confirm the parameter has
# not been explicitly (force) disabled, and enables the setting controlled by
# the parameter when the setting is not disabled.
# Note: Does NOT alter RTCD generation options ($RTCD_OPTIONS).
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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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}

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# Iterates through positional parameters, checks to confirm the parameter has
# not been explicitly (force) enabled, and disables the setting controlled by
# the parameter when the setting is not enabled.
# Note: Does NOT alter RTCD generation options ($RTCD_OPTIONS).
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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=$(awk 'BEGIN { srand(); printf "%d\n",(rand() * 32768)}')
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TMP_H="${TMPDIRx}/aom-conf-$$-${RAND}.h"
TMP_C="${TMPDIRx}/aom-conf-$$-${RAND}.c"
TMP_CC="${TMPDIRx}/aom-conf-$$-${RAND}.cc"
TMP_O="${TMPDIRx}/aom-conf-$$-${RAND}.o"
TMP_X="${TMPDIRx}/aom-conf-$$-${RAND}.x"
TMP_ASM="${TMPDIRx}/aom-conf-$$-${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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}

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check_add_cxxflags() {
  check_cxxflags "$@" && add_cxxflags_only "$@"
}

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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 = -crs\$(if \$(quiet),,v)
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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 AOM_CONFIG_H
#define AOM_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}
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  echo "#endif /* AOM_CONFIG_H */" >> ${TMP_H}
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  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="${optval}"
        ;;
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      --extra-cxxflags=*)
        extra_cxxflags="${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 is_in ${option} ${ARCH_EXT_LIST}; then
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          [ $action = "disable" ] && RTCD_OPTIONS="${RTCD_OPTIONS}--disable-${option} "
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        elif [ $action = "disable" ] && ! disabled $option ; then
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          is_in ${option} ${CMDLINE_SELECT} || die_unknown $opt
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          log_echo "  disabling $option"
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        elif [ $action = "enable" ] && ! enabled $option ; then
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          is_in ${option} ${CMDLINE_SELECT} || 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'`
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        if is_in ${option} ${ARCH_EXT_LIST}; then
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            RTCD_OPTIONS="${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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# Print the major version number of the Darwin SDK specified by $1.
show_darwin_sdk_major_version() {
  xcrun --sdk $1 --show-sdk-version 2>/dev/null | cut -d. -f1
}

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# Print the Xcode version.
show_xcode_version() {
  xcodebuild -version | head -n1 | cut -d' ' -f2
}

# Fails when Xcode version is less than 6.3.
check_xcode_minimum_version() {
  xcode_major=$(show_xcode_version | cut -f1 -d.)
  xcode_minor=$(show_xcode_version | cut -f2 -d.)
  xcode_min_major=6
  xcode_min_minor=3
  if [ ${xcode_major} -lt ${xcode_min_major} ]; then
    return 1
  fi
  if [ ${xcode_major} -eq ${xcode_min_major} ] \
    && [ ${xcode_minor} -lt ${xcode_min_minor} ]; then
    return 1
  fi
}

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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
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      aarch64*)
        tgt_isa=arm64
        ;;
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      armv6*)
        tgt_isa=armv6
        ;;
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      armv7*-hardfloat* | armv7*-gnueabihf | arm-*-gnueabihf)
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        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 "$gcctarget" in
      *darwin10*)
        tgt_isa=x86_64
        tgt_os=darwin10
        ;;
      *darwin11*)
        tgt_isa=x86_64
        tgt_os=darwin11
        ;;
      *darwin12*)
        tgt_isa=x86_64
        tgt_os=darwin12
        ;;
      *darwin13*)
        tgt_isa=x86_64
        tgt_os=darwin13
        ;;
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      *darwin14*)
        tgt_isa=x86_64
        tgt_os=darwin14
        ;;
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      *darwin15*)
        tgt_isa=x86_64
        tgt_os=darwin15
        ;;
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      x86_64*mingw32*)
        tgt_os=win64
        ;;
      *mingw32*|*cygwin*)
        [ -z "$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).
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  # Shared library framework builds are only possible on iOS 8 and later.
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  if enabled shared; then
    IOS_VERSION_OPTIONS="--enable-shared"
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    IOS_VERSION_MIN="8.0"
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  else
    IOS_VERSION_OPTIONS=""
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    IOS_VERSION_MIN="6.0"
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  fi
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  # Handle darwin variants. Newer SDKs allow targeting older
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  # platforms, so use the newest one available.
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  case ${toolchain} in
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    arm*-darwin*)
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      add_cflags "-miphoneos-version-min=${IOS_VERSION_MIN}"
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      iphoneos_sdk_dir="$(show_darwin_sdk_path iphoneos)"
      if [ -d "${iphoneos_sdk_dir}" ]; then
        add_cflags  "-isysroot ${iphoneos_sdk_dir}"
        add_ldflags "-isysroot ${iphoneos_sdk_dir}"
      fi
      ;;
    x86*-darwin*)
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      osx_sdk_dir="$(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 ${toolchain} in
    *-darwin8-*)
      add_cflags  "-mmacosx-version-min=10.4"
      add_ldflags "-mmacosx-version-min=10.4"
      ;;
    *-darwin9-*)
      add_cflags  "-mmacosx-version-min=10.5"
      add_ldflags "-mmacosx-version-min=10.5"
      ;;
    *-darwin10-*)
      add_cflags  "-mmacosx-version-min=10.6"
      add_ldflags "-mmacosx-version-min=10.6"
      ;;
    *-darwin11-*)
      add_cflags  "-mmacosx-version-min=10.7"
      add_ldflags "-mmacosx-version-min=10.7"
      ;;
    *-darwin12-*)
      add_cflags  "-mmacosx-version-min=10.8"
      add_ldflags "-mmacosx-version-min=10.8"
      ;;
    *-darwin13-*)
      add_cflags  "-mmacosx-version-min=10.9"
      add_ldflags "-mmacosx-version-min=10.9"
      ;;
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    *-darwin14-*)
      add_cflags  "-mmacosx-version-min=10.10"
      add_ldflags "-mmacosx-version-min=10.10"
      ;;
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    *-darwin15-*)
      add_cflags  "-mmacosx-version-min=10.11"
      add_ldflags "-mmacosx-version-min=10.11"
      ;;
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    *-iphonesimulator-*)
      add_cflags  "-miphoneos-version-min=${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 ${toolchain} in
            # Apple iOS SDKs no longer support armv6 as of the version 9
            # release (coincides with release of Xcode 7). Only enable media
            # when using earlier SDK releases.
            *-darwin*)
              if [ "$(show_darwin_sdk_major_version iphoneos)" -lt 9 ]; then
                soft_enable media
              else
                soft_disable media
                RTCD_OPTIONS="${RTCD_OPTIONS}--disable-media "
              fi
              ;;
            *)
              soft_enable media
              ;;
          esac
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          ;;
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        armv6)
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          case ${toolchain} in
            *-darwin*)
              if [ "$(show_darwin_sdk_major_version iphoneos)" -lt 9 ]; then
                soft_enable media
              else
                die "Your iOS SDK does not support armv6."
              fi
              ;;
            *)
              soft_enable media
              ;;
          esac
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          ;;
      esac
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      asm_conversion_cmd="cat"
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      case ${tgt_cc} in
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        gcc)
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          link_with_cc=gcc
          setup_gnu_toolchain
          arch_int=${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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          elif [ ${tgt_isa} = "arm64" ] || [ ${tgt_isa} = "armv8" ]; then
            check_add_cflags -march=armv8-a
            check_add_asflags -march=armv8-a
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          else
            check_add_cflags -march=${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}
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          # 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
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          ;;
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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 ${tgt_os} in
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        none*)
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          disable_feature multithread
          disable_feature os_support
          ;;
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        android*)
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          if [ -z "${sdk_path}" ]; then
            die "Must specify --sdk-path for Android builds."
          fi

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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

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          if [ -d "${alt_libc}" ]; then
            add_cflags "--sysroot=${alt_libc}"
            add_ldflags "--sysroot=${alt_libc}"
          fi
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          # 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
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          LD="${CXX:-$(${XCRUN_FIND} ld)}"
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          # 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}"