autoconf: use compiler flag test macro from GNU Autoconf Archive

(This implementation has EXTRA-FLAGS option.)

norefs

Change-Id: I456b89ce8a7b2624b0196013527682fce13078e6

configure.ac

@@ -140,7 +140,7 @@ AC_ARG_ENABLE([recvmmsg],
 AC_ARG_ENABLE([lto],
     AS_HELP_STRING([--enable-lto=yes|no], [enable link-time optimizations, enable if not broken for some extra speed [default=no]]),
     [case "${enableval}" in
-      yes) AX_CHECK_COMPILER_FLAGS("-flto", [CFLAGS="$CFLAGS -flto"], []) ;;
+      yes) AX_CHECK_COMPILE_FLAG("-flto", [CFLAGS="$CFLAGS -flto"], []) ;;
       no) ;;
       *)  AC_MSG_ERROR([bad value ${enableval} for --enable-lto]) ;;
     esac])
@@ -150,11 +150,11 @@ AC_ARG_ENABLE([microseconds-log],
     AS_HELP_STRING([--enable-microseconds-log], [enable microseconds in log messages [default=no]]),
     AC_DEFINE([ENABLE_MICROSECONDS_LOG], [1], [microseconds in log messages]))
 
-AX_CHECK_COMPILER_FLAGS("-fpredictive-commoning", [CFLAGS="$CFLAGS -fpredictive-commoning"], [])
+AX_CHECK_COMPILE_FLAG("-fpredictive-commoning", [CFLAGS="$CFLAGS -fpredictive-commoning"], [])
 
 # Disable strict aliasing
 # FIXME: we break strict aliasing on many occurenes, disable it until resolved or kept
-AX_CHECK_COMPILER_FLAGS("-fno-strict-aliasing", [CFLAGS="$CFLAGS -fno-strict-aliasing"], [])
+AX_CHECK_COMPILE_FLAG("-fno-strict-aliasing", [CFLAGS="$CFLAGS -fno-strict-aliasing"], [])
 
 # Checks for libraries.
 # FIXME: Replace `main' with a function in `-lm':

m4/ax_check_compiler_flags.m4 → m4/ax_check_compile_flag.m4

 # ===========================================================================
-#        http://autoconf-archive.cryp.to/ax_check_compiler_flags.html
+#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
-#   AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
 #
 # DESCRIPTION
 #
-#   Check whether the given compiler FLAGS work with the current language's
-#   compiler, or whether they give an error. (Warnings, however, are
-#   ignored.)
+#   Check whether the given FLAG works with the current language's compiler
+#   or gives an error.  (Warnings, however, are ignored)
 #
 #   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
 #   success/failure.
 #
-# LAST MODIFICATION
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
+#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
+#   force the compiler to issue an error when a bad flag is given.
 #
-#   2008-04-12
+#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
 #
-# COPYLEFT
+# LICENSE
 #
-#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
-#   Copyright (c) 2008 Matteo Frigo
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
 #   This program is free software: you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
@@ -46,33 +49,24 @@
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Macro Archive. When you make and
-#   distribute a modified version of the Autoconf Macro, you may extend this
-#   special exception to the GPL to apply to your modified version as well.
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
 
-AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
-[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
-AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
-dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
-AS_LITERAL_IF([$1],
-  [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1), [
-      ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
-      _AC_LANG_PREFIX[]FLAGS="$1"
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
-        AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
-        AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
-      _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
-  [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
-   _AC_LANG_PREFIX[]FLAGS="$1"
-   AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
-     eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
-     eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
-   _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
-eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)
-AC_MSG_RESULT($ax_check_compiler_flags)
-if test "x$ax_check_compiler_flags" = xyes; then
-	m4_default([$2], :)
-else
-	m4_default([$3], :)
-fi
-])dnl AX_CHECK_COMPILER_FLAGS
+#serial 2
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+    [AS_VAR_SET(CACHEVAR,[yes])],
+    [AS_VAR_SET(CACHEVAR,[no])])
+  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS

m4/ax_ext.m4

@@ -98,22 +98,22 @@ AC_DEFUN([AX_EXT],
 
   if test "$ax_cv_have_mmx_ext" = yes; then
     AC_DEFINE(HAVE_MMX,,[Support mmx instructions])
-    AX_CHECK_COMPILER_FLAGS([-mmmx], [SIMD_FLAGS="$SIMD_FLAGS -mmmx"], [])
+    AX_CHECK_COMPILE_FLAG([-mmmx], [SIMD_FLAGS="$SIMD_FLAGS -mmmx"], [])
   fi
 
   if test "$ax_cv_have_sse_ext" = yes; then
     AC_DEFINE(HAVE_SSE,,[Support SSE (Streaming SIMD Extensions) instructions])
-    AX_CHECK_COMPILER_FLAGS([-msse], [SIMD_FLAGS="$SIMD_FLAGS -msse"], [])
+    AX_CHECK_COMPILE_FLAG([-msse], [SIMD_FLAGS="$SIMD_FLAGS -msse"], [])
   fi
 
   if test "$ax_cv_have_sse2_ext" = yes; then
     AC_DEFINE(HAVE_SSE2,,[Support SSE2 (Streaming SIMD Extensions 2) instructions])
-    AX_CHECK_COMPILER_FLAGS([-msse2], [SIMD_FLAGS="$SIMD_FLAGS -msse2"], [])
+    AX_CHECK_COMPILE_FLAG([-msse2], [SIMD_FLAGS="$SIMD_FLAGS -msse2"], [])
   fi
 
   if test "$ax_cv_have_sse3_ext" = yes; then
     AC_DEFINE(HAVE_SSE3,,[Support SSE3 (Streaming SIMD Extensions 3) instructions])
-    AX_CHECK_COMPILER_FLAGS([-msse3], [SIMD_FLAGS="$SIMD_FLAGS -msse3"], [])
+    AX_CHECK_COMPILE_FLAG([-msse3], [SIMD_FLAGS="$SIMD_FLAGS -msse3"], [])
   fi
 
   if test "$ax_cv_have_ssse3_ext" = yes; then