2022-02-21 07:56 UTC-0500 ~ Mauricio Vásquez <mauricio@xxxxxxxxxx>
> This commit fixes a compilation error on systems with glibc < 2.26 [0]:
>
> ```
> In file included from main.h:14:0,
> from gen.c:24:
> linux/tools/include/tools/libc_compat.h:11:21: error: attempt to use poisoned "reallocarray"
> static inline void *reallocarray(void *ptr, size_t nmemb, size_t size)
> ```
>
> This happens because gen.c pulls <bpf/libbpf_internal.h>, and then
> <tools/libc_compat.h> (through main.h). When
> COMPAT_NEED_REALLOCARRAY is set, libc_compat.h defines reallocarray()
> which libbpf_internal.h poisons with a GCC pragma.
>
> This commit reuses libbpf_reallocarray() implemented in commit
> 029258d7b228 ("libbpf: Remove any use of reallocarray() in libbpf").
>
> v1 -> v2:
> - reuse libbpf_reallocarray() instead of reimplementing it
>
> Reported-by: Quentin Monnet <quentin@xxxxxxxxxxxxx>
> Signed-off-by: Mauricio Vásquez <mauricio@xxxxxxxxxx>
>
> [0]: https://lore.kernel.org/bpf/3bf2bd49-9f2d-a2df-5536-bc0dde70a83b@xxxxxxxxxxxxx/
Fixes: a9caaba399f9 ("bpftool: Implement "gen min_core_btf" logic")
Reviewed-by: Quentin Monnet <quentin@xxxxxxxxxxxxx>
Thanks!
