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selftests/bpf: Silence unused-but-set build warnings

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There are some set but not used build errors when compiling bpf selftests
with the latest upstream mainline GCC, at the beginning add the attribute
__maybe_unused for the variables, but it is better to just add the option
-Wno-unused-but-set-variable to CFLAGS in Makefile to disable the errors
instead of hacking the tests.

  tools/testing/selftests/bpf/map_tests/lpm_trie_map_basic_ops.c:229:36:
  error: variable ‘n_matches_after_delete’ set but not used [-Werror=unused-but-set-variable=]

  tools/testing/selftests/bpf/map_tests/lpm_trie_map_basic_ops.c:229:25:
  error: variable ‘n_matches’ set but not used [-Werror=unused-but-set-variable=]

  tools/testing/selftests/bpf/prog_tests/bpf_cookie.c:426:22:
  error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]

  tools/testing/selftests/bpf/prog_tests/find_vma.c:52:22:
  error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]

  tools/testing/selftests/bpf/prog_tests/perf_branches.c:67:22:
  error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]

  tools/testing/selftests/bpf/prog_tests/perf_link.c:15:22:
  error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Link: https://lore.kernel.org/r/20251018082815.20622-1-yangtiezhu@loongson.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tiezhu Yang
2025-10-18 16:28:15 +08:00
committed by Alexei Starovoitov
parent 50de48a4dd
commit c67f4ae737
1 changed files with 1 additions and 0 deletions
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1
tools/testing/selftests/bpf/Makefile
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@@ -46,6 +46,7 @@ endif
CFLAGS += -g $(OPT_FLAGS) -rdynamic -std=gnu11 \
-Wall -Werror -fno-omit-frame-pointer \
-Wno-unused-but-set-variable \
$(GENFLAGS) $(SAN_CFLAGS) $(LIBELF_CFLAGS) \
-I$(CURDIR) -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \
-I$(TOOLSINCDIR) -I$(TOOLSARCHINCDIR) -I$(APIDIR) -I$(OUTPUT)