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# SPDX-License-Identifier: GPL-2.0-only
CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
ifdef CONFIG_CC_IS_GCC
CFLAGS_GCOV += -fno-tree-loop-im
# Use atomic counter updates to avoid concurrent-access crashes in GCOV.
# Only enable if -fprofile-update=prefer-atomic does not introduce new
# undefined symbols (e.g. libatomic calls that the kernel cannot link).
CFLAGS_GCOV += $(call try-run,\
echo 'long long x; void f(void){x++;}' | \
$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w $(CFLAGS_GCOV) \
-x c - -c -o "$$TMP.base" && \
echo 'long long x; void f(void){x++;}' | \
$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w $(CFLAGS_GCOV) \
-fprofile-update=prefer-atomic \
-x c - -c -o "$$TMP" && \
$(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \
$(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \
cmp -s "$$TMP.ubase" "$$TMP.utest",\
-fprofile-update=prefer-atomic)
endif
export CFLAGS_GCOV
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