Prune shout_prefix from *-config include flags if it would generate a warning.

Make all xiph_compiler macros comply with our coding guidelines
XIPH_GCC_INCLUDE_WARNING renamed XIPH_GCC_WARNING

svn path=/trunk/m4/; revision=5013

m4/ac_config_libconfig_in.m4

@@ -98,11 +98,11 @@ for option in $options extra; do
     exec-prefix | eprefix)  echo '  o="$o $exec_prefix"' >>$LIBCONFIG_FILE ;;
     template-version)  echo '  o="$o $template_version"' >>$LIBCONFIG_FILE ;;
     cflags)
-      echo '  i=`eval echo "$includedir"`' >>$LIBCONFIG_FILE ;
-      echo '  i=`eval echo "$i"`' >>$LIBCONFIG_FILE ;
-      echo '  if test "_$i" != "_/usr/include" ; then' >>$LIBCONFIG_FILE ;
-      echo '    o="$o -I$includedir"' >>$LIBCONFIG_FILE ;
-      echo '  fi' >>$LIBCONFIG_FILE ;
+#      echo '  i=`eval echo "$includedir"`' >>$LIBCONFIG_FILE ;
+#      echo '  i=`eval echo "$i"`' >>$LIBCONFIG_FILE ;
+#      echo '  if test "_$i" != "_/usr/include" ; then' >>$LIBCONFIG_FILE ;
+#      echo '    o="$o -I$includedir"' >>$LIBCONFIG_FILE ;
+#      echo '  fi' >>$LIBCONFIG_FILE ;
       echo '  o="$o $cflags"' >>$LIBCONFIG_FILE ;;
     libs)  echo '  o="$o -L$libdir $libs"' >>$LIBCONFIG_FILE ;;
     help)  echo '  h="1"' >>$LIBCONFIG_FILE ;;

m4/ogg.m4

@@ -23,7 +23,7 @@ if test "x$ogg_prefix" = "x"; then
     fi
 fi
 
-XIPH_GCC_INCLUDE_WARNING([$ogg_prefix/include],,
+XIPH_GCC_WARNING([-I$ogg_prefix/include],,
         [OGG_CFLAGS="-I$ogg_prefix/include"
         OGG_LDFLAGS="-L$ogg_prefix/lib"
         ])

m4/vorbis.m4

@@ -32,7 +32,7 @@ fi
 VORBIS_CFLAGS="$OGG_CFLAGS"
 VORBIS_LDFLAGS="$OGG_LDFLAGS"
 if test "x$vorbis_prefix" != "x$ogg_prefix"; then
-    XIPH_GCC_INCLUDE_WARNING("$vorbis_prefix/include",,
+    XIPH_GCC_WARNING(-I"$vorbis_prefix/include",,
             [VORBIS_CFLAGS="$VORBIS_CFLAGS -I$vorbis_prefix/include"
             VORBIS_LDFLAGS="-L$vorbis_prefix/lib $VORBIS_LDFLAGS"
             ])

m4/xiph_compiler.m4

 dnl xiph_compiler.m4
-dnl $Id: xiph_compiler.m4,v 1.3 2003/06/24 05:04:54 brendan Exp $
-
-dnl XIPH_CLEAN_CCFLAGS
-dnl Brendan Cully <brendan@xiph.org> 20030612
-dnl
-# XIPH_CLEAN_CCFLAGS(flag-list, dest-shell-var-name)
-# Filters out duplicate compiler flags
-# Operates right-to-left on -l flags, left-to-right on everything else
-# eg XIPH_CLEAN_CCFLAGS([-L/opt/lib -lfoo -lm -L/opt/lib -lbar -lm], [MY_LDFLAGS])
-# => MY_LDFLAGS="-L/opt/lib -lfoo -lbar -lm"
-# the cat<<EOF construct makes sure echo doesn't pick, say, -n
-AC_DEFUN([XIPH_CLEAN_CCFLAGS],
-[AC_REQUIRE([AC_PROG_FGREP])
-xcc_REV_FLAGS=''
-for flag in $1
-do
-  case "$flag" in
-  -l*)
-    xcc_REV_FLAGS="$flag $xcc_REV_FLAGS"
-    ;;
-  *)
-    if { cat <<EOF
- $xcc_REV_FLAGS x
-EOF
-} | $FGREP -v -e " $flag " > /dev/null
-    then
-      xcc_REV_FLAGS="$flag $xcc_REV_FLAGS"
-    fi
-  esac
-done
-
-for flag in $xcc_REV_FLAGS
-do
-  if { cat <<EOF
- $$2 x
-EOF
-} | $FGREP -v -e " $flag " > /dev/null
-  then
-    $2="$flag $$2"
-  fi
-done
-])dnl XIPH_CLEAN_CCFLAGS
+dnl $Id: xiph_compiler.m4,v 1.4 2003/06/26 16:03:37 brendan Exp $
 
 dnl XIPH_FUNC_VA_COPY
 dnl Karl Heyes
@@ -79,29 +38,89 @@ AC_TRY_COMPILE([int func(void) __attribute__((unused));],
 ])
 ])dnl XIPH_C_ATTRIBUTE
 
-dnl XIPH_GCC_INCLUDE_WARNING
+dnl XIPH_GCC_WARNING
 dnl Karl Heyes
 dnl
-# XIPH_GCC_INCLUDE_WARNING(include-dir, action-if-warning, action-if-not)
-# Tests whether GCC emits a warning if explicitly asked to put include-dir
-# in its include path, because GCC is already including that path by default
-AC_DEFUN([XIPH_GCC_INCLUDE_WARNING],
+# XIPH_GCC_WARNING(flag, action-if-warning, action-if-not)
+# Tests whether GCC emits a warning if explicitly asked to use flag.
+# Useful for eg system default include paths
+AC_DEFUN([XIPH_GCC_WARNING],
 [AC_REQUIRE([AC_PROG_CC])
-xgiw_warning=no
+xt_warning=no
 if test x"$GCC" = "xyes"
 then
   save_cflags="$CFLAGS"
-  CFLAGS="-Werror -I$1"
-  AC_TRY_COMPILE(,,,xgiw_warning=yes)
+  CFLAGS="-Werror $1"
+  AC_TRY_COMPILE(,,,xt_warning=yes)
   CFLAGS="$save_cflags"
 fi
-if test "$xgiw_warning" = "yes"
+if test "$xt_warning" = "yes"
 then
   ifelse([$2],,:,[$2])
 else
   ifelse([$3],,:,[$3])
 fi
-])dnl XIPH_GCC_INCLUDE_WARNING
+])dnl XIPH_GCC_WARNING
+
+dnl XIPH_CLEAN_CCFLAGS
+dnl Brendan Cully <brendan@xiph.org> 20030612
+dnl
+# XIPH_CLEAN_CCFLAGS(flag-list, dest-shell-var-name)
+# Filters out duplicate compiler flags, and -I flags if XIPH_GCC_WARNING
+# complains about them
+# Operates right-to-left on -l flags, left-to-right on everything else
+# eg XIPH_CLEAN_CCFLAGS([-L/opt/lib -lfoo -lm -L/opt/lib -lbar -lm], [MY_LDFLAGS])
+# => MY_LDFLAGS="-L/opt/lib -lfoo -lbar -lm"
+# the cat<<EOF construct makes sure echo doesn't pick, say, -n
+AC_DEFUN([XIPH_CLEAN_CCFLAGS],
+[AC_REQUIRE([AC_PROG_FGREP])
+xt_FLAGS=''
+
+for flag in $1
+do
+  case "$flag" in
+  -l*)
+    xt_FLAGS="$flag $xt_FLAGS"
+    ;;
+  *)
+    if { cat <<EOF
+ $xt_FLAGS x
+EOF
+} | $FGREP -v -e " $flag " > /dev/null
+    then
+      xt_FLAGS="$flag $xt_FLAGS"
+    fi
+    ;;
+  esac
+done
+
+$2=''
+for flag in $xt_FLAGS
+do
+  if { cat <<EOF
+ $$2 x
+EOF
+} | $FGREP -v -e " $flag " > /dev/null
+  then
+    $2="$flag $$2"
+  fi
+done
+
+# Prune -I flags if $CC warns about them
+xt_FLAGS=''
+for flag in $$2
+do
+  case "$flag" in
+  -I*)
+    XIPH_GCC_WARNING([$flag], [], [xt_FLAGS="$xt_FLAGS $flag"])
+    ;;
+  *)
+    xt_FLAGS="$xt_FLAGS $flag"
+    ;;
+  esac
+done
+$2="$xt_FLAGS"
+])dnl XIPH_CLEAN_CCFLAGS
 
 dnl XIPH_VAR_APPEND
 dnl Karl Heyes
@@ -132,8 +151,8 @@ dnl
 AC_DEFUN([XIPH_VAR_PREPEND],
 [dnl
 AC_REQUIRE([AC_PROG_FGREP])
-xvp_compare="$1"
-filtered=""   
+xt_compare="$1"
+xt_filtered=""   
 for arg in $2
 do
   if { cat <<EOF
@@ -141,9 +160,9 @@ do
 EOF
 } | $FGREP -v -e " $arg " > /dev/null
   then
-    compare="$arg $compare"
-    filtered="$filtered $arg"
+    xt_compare="$arg $xt_compare"
+    xt_filtered="$xt_filtered $arg"
   fi
 done
-$1="$filtered $$1"
+$1="$xt_filtered $$1"
 ])dnl XIPH_VAR_PREPEND