Add GIT_CC_CHECK_FLAG_APPEND, GIT_CC_CHECK_FLAGS_APPEND
and GIT_CC_CHECK_LDFLAGS autoconf macro.
Signed-off-by: Elia Pinto <gitter.spiros@xxxxxxxxx>
---
Makefile | 6 ++++--
configure.ac | 45 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index 827006b..23485f1 100644
--- a/Makefile
+++ b/Makefile
@@ -344,10 +344,12 @@ GIT-VERSION-FILE: FORCE
@$(SHELL_PATH) ./GIT-VERSION-GEN
-include GIT-VERSION-FILE
+GIT_CFLAGS =
+GIT_LDFLAGS =
# CFLAGS and LDFLAGS are for the users to override from the command line.
-CFLAGS = -g -O2 -Wall
-LDFLAGS =
+CFLAGS = -g -O2 -Wall $(GIT_CFLAGS)
+LDFLAGS = $(GIT_LDFLAGS)
ALL_CFLAGS = $(CPPFLAGS) $(CFLAGS)
ALL_LDFLAGS = $(LDFLAGS)
STRIP ?= strip
diff --git a/configure.ac b/configure.ac
index 6af9647..c67ca60 100644
--- a/configure.ac
+++ b/configure.ac
@@ -139,6 +139,51 @@ if test -n "$1"; then
fi
])
+
+dnl Check if FLAG in ENV-VAR is supported by compiler and append it
+dnl to WHERE-TO-APPEND variable
+dnl GIT_CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
+
+AC_DEFUN([GIT_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_LINK_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 GIT_CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
+AC_DEFUN([GIT_CC_CHECK_FLAGS_APPEND], [
+ for flag in $3; do
+ GIT_CC_CHECK_FLAG_APPEND($1, $2, $flag)
+ done
+])
+
+dnl Check if the flag is supported by linker (cacheable)
+dnl GIT_CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+
+AC_DEFUN([GIT_CC_CHECK_LDFLAGS], [
+ AC_CACHE_CHECK([if $CC supports $1 flag],
+ AS_TR_SH([cc_cv_ldflags_$1]),
+ [ac_save_LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS $1"
+ AC_LINK_IFELSE([int main() { return 1; }],
+ [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
+ [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
+ LDFLAGS="$ac_save_LDFLAGS"
+ ])
+
+ AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
+ [$2], [$3])
+])
+
+
## Configure body starts here.
AC_PREREQ(2.59)
--
1.7.10.4
--
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