X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=m4%2Fattributes.m4;h=f0bcf2421190af6d2a80529f45f1d9068bafaa42;hp=3bf96a304b8e2f3d781f6952ce6fb19afbcd85aa;hb=33b40551236a6c0c323226b78f1b1e5751a95ff5;hpb=47be870bd83fb3719dffc3ee9348a409ab762a14

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index 3bf96a304..f0bcf2421 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -1,6 +1,7 @@
 dnl Macros to check the presence of generic (non-typed) symbols.
 dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes@gmail.com>
 dnl Copyright (c) 2006-2008 xine project
+dnl Copyright (c) 2012 Lucas De Marchi <lucas.de.marchi@gmail.com>
 dnl
 dnl This program is free software; you can redistribute it and/or modify
 dnl it under the terms of the GNU General Public License as published by
@@ -32,52 +33,28 @@ dnl distribute a modified version of the Autoconf Macro, you may extend
 dnl this special exception to the GPL to apply to your modified version as
 dnl well.
 
-dnl Check if the flag is supported by compiler
-dnl CC_CHECK_CFLAGS_SILENT([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
-
-AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [
-  AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]),
-    [ac_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS $1"
-     AC_COMPILE_IFELSE([int a;],
-       [eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],
-       [eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])
-     CFLAGS="$ac_save_CFLAGS"
-    ])
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
-    [$2], [$3])
-])
-
-dnl Check if the flag is supported by compiler (cacheable)
-dnl CC_CHECK_CFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
-
-AC_DEFUN([CC_CHECK_CFLAGS], [
-  AC_CACHE_CHECK([if $CC supports $1 flag],
-    AS_TR_SH([cc_cv_cflags_$1]),
-    CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
-  )
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
-    [$2], [$3])
-])
-
-dnl CC_CHECK_CFLAG_APPEND(FLAG, [action-if-found], [action-if-not-found])
-dnl Check for CFLAG and appends them to CFLAGS if supported
-AC_DEFUN([CC_CHECK_CFLAG_APPEND], [
-  AC_CACHE_CHECK([if $CC supports $1 flag],
-    AS_TR_SH([cc_cv_cflags_$1]),
-    CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
-  )
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
-    [CFLAGS="$CFLAGS $1"; DEBUG_CFLAGS="$DEBUG_CFLAGS $1"; $2], [$3])
+dnl Check if FLAG in ENV-VAR is supported by compiler and append it
+dnl to WHERE-TO-APPEND variable
+dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
+
+AC_DEFUN([CC_CHECK_FLAG_APPEND], [
+  AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
+                 AS_TR_SH([cc_cv_$2_$3]),
+		 [eval "AS_TR_SH([cc_save_$2])='${$2}'"
+		  eval "AS_TR_SH([$2])='-Werror $3'"
+		  AC_COMPILE_IFELSE([AC_LANG_SOURCE([int a = 0; int main(void) { return a; } ])],
+                                    [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
+                                    [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
+		  eval "AS_TR_SH([$2])='$cc_save_$2'"])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes],
+        [eval "$1='${$1} $3'"])
 ])
 
-dnl CC_CHECK_CFLAGS_APPEND([FLAG1 FLAG2], [action-if-found], [action-if-not])
-AC_DEFUN([CC_CHECK_CFLAGS_APPEND], [
-  for flag in $1; do
-    CC_CHECK_CFLAG_APPEND($flag, [$2], [$3])
+dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
+AC_DEFUN([CC_CHECK_FLAGS_APPEND], [
+  for flag in $3; do
+    CC_CHECK_FLAG_APPEND($1, $2, $flag)
   done
 ])
 
@@ -147,7 +124,7 @@ AC_DEFUN([CC_CHECK_ATTRIBUTE], [
     AS_TR_SH([cc_cv_attribute_$1]),
     [ac_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS $cc_cv_werror"
-     AC_COMPILE_IFELSE([$3],
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE([$3])],
        [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"],
        [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"])
      CFLAGS="$ac_save_CFLAGS"
@@ -271,11 +248,11 @@ AC_DEFUN([CC_FUNC_EXPECT], [
     [cc_cv_func_expect],
     [ac_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS $cc_cv_werror"
-     AC_COMPILE_IFELSE(
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE(
        [int some_function() {
         int a = 3;
         return (int)__builtin_expect(a, 3);
-	}],
+	}])],
        [cc_cv_func_expect=yes],
        [cc_cv_func_expect=no])
      CFLAGS="$ac_save_CFLAGS"
@@ -295,11 +272,11 @@ AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
     [ac_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS $cc_cv_werror"
      for cc_attribute_align_try in 64 32 16 8 4 2; do
-        AC_COMPILE_IFELSE([
+        AC_COMPILE_IFELSE([AC_LANG_SOURCE([
           int main() {
             static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
             return c;
-          }], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
+          }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
      done
      CFLAGS="$ac_save_CFLAGS"
   ])