Makefile: add a new script to check -fstack-usage support

If -fstack-usage option is given to crosstools that do not support it, gcc displays a warning message but still exits with status 0. This means we can not rely on $(call cc-option,...) to detect if -fstack-usage option is supported or not. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

Makefile: add a new script to check -fstack-usage support
If -fstack-usage option is given to crosstools that do not support it, gcc displays a warning message but still exits with status 0. This means we can not rely on $(call cc-option,...) to detect if -fstack-usage option is supported or not. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Masahiro Yamada · Tom Rini
1 parent ad21fbc118
Showing 2 changed files with 21 additions and 1 deletions Side-by-side Diff
Makefile
scripts/gcc-stack-usage.sh
@@ -547,7 +547,9 @@
 KBUILD_AFLAGS	+= -g
  
 # Report stack usage if supported
-KBUILD_CFLAGS += $(call cc-option,-fstack-usage)
+ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-stack-usage.sh $(CC)),y)
+	KBUILD_CFLAGS += -fstack-usage
+endif
  
 KBUILD_CFLAGS += $(call cc-option,-Wno-format-nonliteral)
  
+#!/bin/sh
+# Test for gcc '-fstack-usage' support
+# Copyright (C) 2013, Masahiro Yamada <yamada.m@jp.panasonic.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+TMP="$$"
+
+cat <<END | $@ -Werror -fstack-usage -x c - -c -o $TMP >/dev/null 2>&1 \
+							&& echo "y"
+int main(void)
+{
+	return 0;
+}
+END
+
+rm -f $TMP $TMP.su
...	...	@@ -547,7 +547,9 @@
547	547	KBUILD_AFLAGS += -g
548	548
549	549	# Report stack usage if supported
550		-KBUILD_CFLAGS += $(call cc-option,-fstack-usage)
	550	+ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-stack-usage.sh $(CC)),y)
	551	+ KBUILD_CFLAGS += -fstack-usage
	552	+endif
551	553
552	554	KBUILD_CFLAGS += $(call cc-option,-Wno-format-nonliteral)
553	555
	1	+#!/bin/sh
	2	+# Test for gcc '-fstack-usage' support
	3	+# Copyright (C) 2013, Masahiro Yamada <yamada.m@jp.panasonic.com>
	4	+#
	5	+# SPDX-License-Identifier: GPL-2.0+
	6	+#
	7	+
	8	+TMP="$$"
	9	+
	10	+cat <<END \| $@ -Werror -fstack-usage -x c - -c -o $TMP >/dev/null 2>&1 \
	11	+ && echo "y"
	12	+int main(void)
	13	+{
	14	+ return 0;
	15	+}
	16	+END
	17	+
	18	+rm -f $TMP $TMP.su