| # 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 |
