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    Subject[patch 5/5] -fstack-protector feature: Enable the compiler flags in CFLAGS
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    Subject: [patch 5/5] Add the -fstack-protector option to the CFLAGS
    From: Arjan van de Ven <arjan@linux.intel.com>

    Add a feature check that checks that the gcc compiler has stack-protector
    support and has the bugfix for PR28281 to make this work in kernel mode.
    The easiest solution I could find was to have a shell script in scripts/
    to do the detection; if needed we can make this fancier in the future
    without making the makefile too complex.

    Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
    CC: Andi Kleen <ak@suse.de>
    CC: Sam Ravnborg <sam@ravnborg.org>

    ---
    arch/x86_64/Makefile | 3 +++
    scripts/gcc-x86_64-has-stack-protector.sh | 8 ++++++++
    2 files changed, 11 insertions(+)

    Index: linux-2.6.18-rc4-stackprot/arch/x86_64/Makefile
    ===================================================================
    --- linux-2.6.18-rc4-stackprot.orig/arch/x86_64/Makefile
    +++ linux-2.6.18-rc4-stackprot/arch/x86_64/Makefile
    @@ -55,6 +55,9 @@ cflags-y += $(call cc-option,-funit-at-a
    # prevent gcc from generating any FP code by mistake
    cflags-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)

    +cflags-$(CONFIG_CC_STACKPROTECTOR) += $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC) -fstack-protector )
    +cflags-$(CONFIG_CC_STACKPROTECTOR_ALL) += $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC) -fstack-protector-all )
    +
    CFLAGS += $(cflags-y)
    CFLAGS_KERNEL += $(cflags-kernel-y)
    AFLAGS += -m64
    Index: linux-2.6.18-rc4-stackprot/scripts/gcc-x86_64-has-stack-protector.sh
    ===================================================================
    --- /dev/null
    +++ linux-2.6.18-rc4-stackprot/scripts/gcc-x86_64-has-stack-protector.sh
    @@ -0,0 +1,6 @@
    +#!/bin/sh
    +
    +echo "int foo(void) { char X[200]; return 3; }" | $1 -S -xc -c -O0 -mcmodel=kernel -fstack-protector - -o - | grep -q "%gs"
    +if [ "$?" -eq "0" ] ; then
    + echo $2
    +fi
    -
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