Andrii Nakryiko 474e70bd90 libbpf: Avoid enum forward-declarations in public API in C++ mode ... [ Upstream commit b42693415b ] C++ enum forward declarations are fundamentally not compatible with pure C enum definitions, and so libbpf's use of `enum bpf_stats_type;` forward declaration in libbpf/bpf.h public API header is causing C++ compilation issues. More details can be found in [0], but it comes down to C++ supporting enum forward declaration only with explicitly specified backing type: enum bpf_stats_type: int; In C (and I believe it's a GCC extension also), such forward declaration is simply: enum bpf_stats_type; Further, in Linux UAPI this enum is defined in pure C way: enum bpf_stats_type { BPF_STATS_RUN_TIME = 0; } And even though in both cases backing type is int, which can be confirmed by looking at DWARF information, for C++ compiler actual enum definition and forward declaration are incompatible. To eliminate this problem, for C++ mode define input argument as int, which makes enum unnecessary in libbpf public header. This solves the issue and as demonstrated by next patch doesn't cause any unwanted compiler warnings, at least with default warnings setting. [0] https://stackoverflow.com/questions/42766839/c11-enum-forward-causes-underlying-type-mismatch [1] Closes: https://github.com/libbpf/libbpf/issues/249 Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20221130200013.2997831-1-andrii@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-12-31 13:14:43 +01:00
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api	tools api fs: Cache cgroupfs mount point	2021-02-17 15:09:08 -03:00
bpf	libbpf: Avoid enum forward-declarations in public API in C++ mode	2022-12-31 13:14:43 +01:00
lockdep	…
perf	perf tools: Fix segfault accessing sample_id xyarray	2022-04-27 14:38:50 +02:00
subcmd	libsubcmd: Fix use-after-free for realloc(..., 0)	2022-02-23 12:03:12 +01:00
symbol	libsymbols kallsyms: Move hex2u64 out of header	2020-05-05 16:35:32 -03:00
traceevent	KVM: x86/mmu: Rename "nxe" role bit to "efer_nx" for macro shenanigans	2021-06-24 18:00:41 -04:00
argv_split.c	…
bitmap.c	tools lib: Adopt bitmap_intersects() operation from the kernel sources	2021-06-30 15:28:00 -03:00
ctype.c	…
find_bit.c	tools: sync lib/find_bit implementation	2021-05-06 19:24:12 -07:00
hweight.c	…
rbtree.c	tools/: replace HTTP links with HTTPS ones	2020-08-07 11:33:21 -07:00
str_error_r.c	…
string.c	tools lib: Adopt memchr_inv() from kernel	2020-11-27 08:34:52 -03:00
vsprintf.c	…
zalloc.c	…