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f541906e89
* split the CFLAGS_GCOV block out of the top-level Makefile into scripts/Makefile.gcov * include it via include-$(CONFIG_GCOV_KERNEL) like neighbour KASAN/KCOV/UBSAN makefiles do * keep the include before scripts/Makefile.gcc-plugins: the try-run must not get -fplugin= options, plugins do not exist on clean builds CFLAGS_GCOV is no longer defined when CONFIG_GCOV_KERNEL is off: * its user in scripts/Makefile.lib is guarded by the CONFIG_GCOV_KERNEL * in i915/xe header an empty value is harmless The try-run compiler invocations also stop running on builds without GCOV. Link: https://lore.kernel.org/20261001-b4-prep-gcov-v1-2-794792e06f24@virtuozzo.com Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Suggested-by: Peter Oberparleiter <oberpar@linux.ibm.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nicolas Schier <nsc@kernel.org> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Mikhail Zaslonko <zaslonko@linux.ibm.com>
22 lines
910 B
Makefile
22 lines
910 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
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ifdef CONFIG_CC_IS_GCC
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CFLAGS_GCOV += -fno-tree-loop-im
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# Use atomic counter updates to avoid concurrent-access crashes in GCOV.
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# Only enable if -fprofile-update=prefer-atomic does not introduce new
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# undefined symbols (e.g. libatomic calls that the kernel cannot link).
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CFLAGS_GCOV += $(call try-run,\
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echo 'long long x; void f(void){x++;}' | \
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$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w $(CFLAGS_GCOV) \
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-x c - -c -o "$$TMP.base" && \
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echo 'long long x; void f(void){x++;}' | \
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$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w $(CFLAGS_GCOV) \
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-fprofile-update=prefer-atomic \
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-x c - -c -o "$$TMP" && \
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$(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \
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$(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \
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cmp -s "$$TMP.ubase" "$$TMP.utest",\
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-fprofile-update=prefer-atomic)
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endif
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export CFLAGS_GCOV
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