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| author | Andrii Nakryiko <andrii@kernel.org> | 2021-04-23 21:13:33 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-04-24 00:05:26 +0300 |
| commit | 0fec7a3cee1cf8e4f86ff563d229408ccbdc2d66 (patch) | |
| tree | 819ff515663653459f53849db97538345e828e29 /tools | |
| parent | 5b438f01d7eb2dc9bec7cd79de881b5f155d9a71 (diff) | |
| download | linux-0fec7a3cee1cf8e4f86ff563d229408ccbdc2d66.tar.xz | |
libbpf: Suppress compiler warning when using SEC() macro with externs
When used on externs SEC() macro will trigger compilation warning about
inapplicable `__attribute__((used))`. That's expected for extern declarations,
so suppress it with the corresponding _Pragma.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210423181348.1801389-4-andrii@kernel.org
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/lib/bpf/bpf_helpers.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index b904128626c2..75c7581b304c 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -25,9 +25,16 @@ /* * Helper macro to place programs, maps, license in * different sections in elf_bpf file. Section names - * are interpreted by elf_bpf loader + * are interpreted by libbpf depending on the context (BPF programs, BPF maps, + * extern variables, etc). + * To allow use of SEC() with externs (e.g., for extern .maps declarations), + * make sure __attribute__((unused)) doesn't trigger compilation warning. */ -#define SEC(NAME) __attribute__((section(NAME), used)) +#define SEC(name) \ + _Pragma("GCC diagnostic push") \ + _Pragma("GCC diagnostic ignored \"-Wignored-attributes\"") \ + __attribute__((section(name), used)) \ + _Pragma("GCC diagnostic pop") \ /* Avoid 'linux/stddef.h' definition of '__always_inline'. */ #undef __always_inline |