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We want it to be possible to bulid with clang, so also check against that.
# Pascal Jäger <pascal.jaeger@leimstift.de>
--- a/configure.ac
+++ b/configure.ac
@@ -303,7 +303,7 @@ done
AC_DEFUN([AC_CHECK_GCC_ARG],
[if test -n "$GCC"; then
- AC_CACHE_CHECK([whether gcc accepts [$2]],
+ AC_CACHE_CHECK([whether $[$CC] accepts [$2]],
ac_cv_gcc_accepts_[$1],
[rm -rf conftest.$ac_ext
touch conftest.$ac_ext
@@ -316,7 +316,7 @@ AC_DEFUN([AC_CHECK_GCC_ARG],
# earlier diagnostics".
#
without_no=`echo $2 | sed s/Wno-/W/`
- if ( ( gcc -c $without_no conftest.$ac_ext -o/dev/null >/dev/null ) \
+ if ( ( $CC -c $without_no conftest.$ac_ext -o/dev/null >/dev/null ) \
2>&1 | \
grep unrecognized >/dev/null ); then
ac_cv_gcc_accepts_[$1]=no
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