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After building with CONFIG_FORTIFY_SOURCE=y, many .*.d files are left
in lib/test_fortify/ because the compiler outputs header dependencies
into *.d without fixdep being invoked.
When compiling C files, if_changed_dep should be used so that the
auto-generated header dependencies are recorded in .*.cmd files.
Currently, if_changed is incorrectly used, and only two headers are
hard-coded in lib/Makefile.
In the previous patch version, the kbuild test robot detected new errors
on GCC 7.
GCC 7 or older does not produce test.d with the following test code:
$ echo 'void b(void) __attribute__((__error__(""))); void a(void) { b(); }' |
gcc -Wp,-MMD,test.d -c -o /dev/null -x c -
Perhaps, this was a bug that existed in older GCC versions.
Skip the tests for GCC<=7 for now, as this will be eventually solved
when we bump the minimal supported GCC version.
Link: https://lore.kernel.org/oe-kbuild-all/CAK7LNARmJcyyzL-jVJfBPi3W684LTDmuhMf1koF0TXoCpKTmcw@mail.gmail.com/T/#m13771bf78ae21adff22efc4d310c973fb4bcaf67
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20240727150302.1823750-4-masahiroy@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
29 lines
973 B
Makefile
29 lines
973 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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ccflags-y := $(call cc-disable-warning,fortify-source)
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quiet_cmd_test_fortify = TEST $@
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cmd_test_fortify = $(CONFIG_SHELL) $(src)/test_fortify.sh \
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$< $@ "$(NM)" $(CC) $(c_flags) -DKBUILD_EXTRA_WARN1
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$(obj)/%.log: $(src)/%.c $(src)/test_fortify.sh FORCE
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$(call if_changed_dep,test_fortify)
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logs = $(patsubst $(src)/%.c, %.log, $(wildcard $(src)/*-*.c))
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targets += $(logs)
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quiet_cmd_gen_fortify_log = CAT $@
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cmd_gen_fortify_log = cat $(or $(real-prereqs),/dev/null) > $@
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$(obj)/test_fortify.log: $(addprefix $(obj)/, $(logs)) FORCE
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$(call if_changed,gen_fortify_log)
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# GCC<=7 does not always produce *.d files.
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# Run the tests only for GCC>=8 or Clang.
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always-$(call gcc-min-version, 80000) += test_fortify.log
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always-$(CONFIG_CC_IS_CLANG) += test_fortify.log
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# Some architectures define __NO_FORTIFY if __SANITIZE_ADDRESS__ is undefined.
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# Pass CFLAGS_KASAN to avoid warnings.
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KASAN_SANITIZE := y
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