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-rw-r--r--m4/acinclude.m419
1 files changed, 19 insertions, 0 deletions
diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index 15bb31e8..845c8286 100644
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -38,6 +38,25 @@ AC_DEFUN([GCC_STACK_PROTECT_CC],[
fi
])
+dnl GCC_STACK_CLASH_PROTECTION
+dnl check -fstack-clash-protection with the C compiler, if it exists then
+dnl updates CFLAGS
+AC_DEFUN([GCC_STACK_CLASH_PROTECTION],[
+ AC_LANG_ASSERT(C)
+ if test "X$CC" != "X"; then
+ AC_CACHE_CHECK([whether ${CC} accepts -fstack-clash-protection],
+ scp_cv_cc,
+ [scp_old_cflags="$CFLAGS"
+ CFLAGS="$CFLAGS -fstack-clash-protection"
+ AC_TRY_COMPILE(,, scp_cv_cc=yes, scp_cv_cc=no)
+ CFLAGS="$scp_old_cflags"
+ ])
+ if test $scp_cv_cc = yes; then
+ CFLAGS="$CFLAGS -fstack-clash-protection"
+ fi
+ fi
+])
+
dnl GCC_FORTIFY_SOURCE_CC
dnl checks -D_FORTIFY_SOURCE with the C compiler, if it exists then updates
dnl CPPFLAGS