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

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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>
This commit is contained in:
Masahiro Yamada 2013-12-11 20:11:34 +09:00 committed by Tom Rini
parent ad21fbc118
commit 5b1f1f4aff
2 changed files with 21 additions and 1 deletions
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4
Makefile
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@ -547,7 +547,9 @@ KBUILD_CFLAGS += -g
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)

18
scripts/gcc-stack-usage.sh Normal file
View file

@ -0,0 +1,18 @@
#!/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