diff options
Diffstat (limited to 'package/network/utils/bpftools/patches/002-libbpf-fix-build-failure-from-uninitialized-variable.patch')
| -rw-r--r-- | package/network/utils/bpftools/patches/002-libbpf-fix-build-failure-from-uninitialized-variable.patch | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/package/network/utils/bpftools/patches/002-libbpf-fix-build-failure-from-uninitialized-variable.patch b/package/network/utils/bpftools/patches/002-libbpf-fix-build-failure-from-uninitialized-variable.patch new file mode 100644 index 0000000000..a61d0930f8 --- /dev/null +++ b/package/network/utils/bpftools/patches/002-libbpf-fix-build-failure-from-uninitialized-variable.patch @@ -0,0 +1,46 @@ +From 74d0dcf7608b1bab116e297468ac51b57eb97ce0 Mon Sep 17 00:00:00 2001 +From: Tony Ambardar <Tony.Ambardar@gmail.com> +Date: Thu, 20 Aug 2020 10:06:24 -0700 +Subject: [PATCH] libbpf: fix build failure from uninitialized variable warning + +While compiling libbpf, some GCC versions (at least 8.4.0) have difficulty +determining control flow and a emit warning for potentially uninitialized +usage of 'map', which results in a build error if using "-Werror": + +In file included from libbpf.c:56: +libbpf.c: In function '__bpf_object__open': +libbpf_internal.h:59:2: warning: 'map' may be used uninitialized in this function [-Wmaybe-uninitialized] + libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \ + ^~~~~~~~~~~~ +libbpf.c:5032:18: note: 'map' was declared here + struct bpf_map *map, *targ_map; + ^~~ + +The warning/error is false based on code inspection, so silence it with a +NULL initialization. + +Fixes: 646f02ffdd49 ("libbpf: Add BTF-defined map-in-map support") +Ref: 063e68813391 ("libbpf: Fix false uninitialized variable warning") + +Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com> +--- + tools/lib/bpf/libbpf.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c +index 11e4725b8b1c..a72296797357 100644 +--- a/tools/lib/bpf/libbpf.c ++++ b/tools/lib/bpf/libbpf.c +@@ -5028,8 +5028,8 @@ static int bpf_object__collect_map_relos(struct bpf_object *obj, + int i, j, nrels, new_sz, ptr_sz = sizeof(void *); + const struct btf_var_secinfo *vi = NULL; + const struct btf_type *sec, *var, *def; ++ struct bpf_map *map = NULL, *targ_map; + const struct btf_member *member; +- struct bpf_map *map, *targ_map; + const char *name, *mname; + Elf_Data *symbols; + unsigned int moff; +-- +2.25.1 + |