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libbpf: Handle invalid typedef emitted by old GCC

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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
This commit is contained in:
Andrii Nakryiko 2019-10-10 20:29:01 -07:00 committed by Daniel Borkmann
parent 409017847d
commit e78dcbf414
1 changed files with 11 additions and 0 deletions
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11
tools/lib/bpf/btf_dump.c
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@ -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);
}