libbpf: Compile using -std=gnu89

The minimum supported C standard version is C89, with use of GNU
extensions, hence make sure to catch any instances that would break
the build for this mode by passing -std=gnu89.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211105234243.390179-4-memxor@gmail.com

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index b393b5e..5f7086f 100644 (file)
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -84,6 +84,7 @@ else
 endif
 
 # Append required CFLAGS
+override CFLAGS += -std=gnu89
 override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
 override CFLAGS += -Werror -Wall
 override CFLAGS += $(INCLUDES)