diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2019-10-11 05:29:01 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-10-11 23:11:55 +0200 |
| commit | e78dcbf414545b53218dab0fb5af5d6b61513eaf (patch) | |
| tree | 8ff553578ad3fd12d931273d5f24b72e2f9a5228 | |
| parent | libbpf: Generate more efficient BPF_CORE_READ code (diff) | |
| download | linux-e78dcbf414545b53218dab0fb5af5d6b61513eaf.tar.xz linux-e78dcbf414545b53218dab0fb5af5d6b61513eaf.zip | |
libbpf: Handle invalid typedef emitted by old GCC
Old GCC versions are producing invalid typedef for __gnuc_va_list
pointing to void. Special-case this and emit valid:
typedef __builtin_va_list __gnuc_va_list;
Reported-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20191011032901.452042-1-andriin@fb.com
| -rw-r--r-- | tools/lib/bpf/btf_dump.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 87f27e2664c5..139812b46c7b 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -975,6 +975,17 @@ static void btf_dump_emit_typedef_def(struct btf_dump *d, __u32 id, { const char *name = btf_dump_ident_name(d, id); + /* + * Old GCC versions are emitting invalid typedef for __gnuc_va_list + * pointing to VOID. This generates warnings from btf_dump() and + * results in uncompilable header file, so we are fixing it up here + * with valid typedef into __builtin_va_list. + */ + if (t->type == 0 && strcmp(name, "__gnuc_va_list") == 0) { + btf_dump_printf(d, "typedef __builtin_va_list __gnuc_va_list"); + return; + } + btf_dump_printf(d, "typedef "); btf_dump_emit_type_decl(d, t->type, name, lvl); } |