autoconf: Use include-fixed directory with makedepend on newer GCC
On newer GCC releases, the compiler's headers have been split between
the include and include-fixed directories. Add both if the directories
exist.
Signed-off-by: Dan Nicholson <dbn.lists@gmail.com>
Signed-off-by: Julien Cristau <jcristau@debian.org>
diff --git a/configure.ac b/configure.ac
index 33c1072..ba48e9d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,10 +46,14 @@
MKDEP_OPTIONS=-fdepend
dnl Ask gcc where it's keeping its secret headers
if test "x$GCC" = xyes; then
- GCC_INCLUDES=`$CC -print-file-name=include`
- if test "x$GCC_INCLUDES" != x; then
- MKDEP_OPTIONS="$MKDEP_OPTIONS -I$GCC_INCLUDES"
- fi
+ for dir in include include-fixed; do
+ GCC_INCLUDES=`$CC -print-file-name=$dir`
+ if test "x$GCC_INCLUDES" != x && \
+ test "$GCC_INCLUDES" != "$dir" && \
+ test -d "$GCC_INCLUDES"; then
+ MKDEP_OPTIONS="$MKDEP_OPTIONS -I$GCC_INCLUDES"
+ fi
+ done
fi
AC_SUBST([MKDEP_OPTIONS])