configure: Use -fstack-protector-strong when available

[empserver] / m4 / my_append_compile_flags.m4

diff --git a/m4/my_append_compile_flags.m4 b/m4/my_append_compile_flags.m4
index d96fab1d0fb6b9abe4f4cc7ed4923fa5d8bd8745..aa4bf409cd9a2496a2c656d727601a7c12059edd 100644 (file)
--- a/m4/my_append_compile_flags.m4
+++ b/m4/my_append_compile_flags.m4
@@ -1,6 +1,6 @@
 # SYNOPSIS
 #
-#   MY_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
+#   MY_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -20,6 +20,8 @@
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
 #   NOTE: This macro depends on the AX_APPEND_FLAG and
 #   AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
 #   MY_APPEND_LINK_FLAGS.
@@ -62,6 +64,6 @@ AC_DEFUN([MY_APPEND_COMPILE_FLAGS],
 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
 for flag in $1; do
   tflag=`echo "$flag" | sed 's/^-Wno-/-W/'`
-  AX_CHECK_COMPILE_FLAG([$tflag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3])
+  AX_CHECK_COMPILE_FLAG([$tflag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
 done
 ])dnl MY_APPEND_COMPILE_FLAGS