Update attributes.m4 from lscube projects.

1 files changed, 28 insertions, 0 deletions

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index 9c4a0c8..45ea789 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -32,6 +32,9 @@ 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"
@@ -46,6 +49,9 @@ AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [
     [$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]),
@@ -56,6 +62,28 @@ AC_DEFUN([CC_CHECK_CFLAGS], [
     [$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"; $2], [$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])
+  done
+])
+
+dnl Check if the flag is supported by linker (cacheable)
+dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+
 AC_DEFUN([CC_CHECK_LDFLAGS], [
   AC_CACHE_CHECK([if $CC supports $1 flag],
     AS_TR_SH([cc_cv_ldflags_$1]),