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bpftool: Add -Wformat-signedness flag to detect format errors 

This commit adds the -Wformat-signedness compiler flag to detect and
prevent printf format errors, where signed or unsigned types are
mismatched with format specifiers. This helps to catch potential issues at
compile-time, ensuring that our code is more robust and reliable. With
this flag, the compiler will now warn about incorrect format strings, such
as using %d with unsigned types or %u with signed types.

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250311112809.81901-2-jiayuan.chen@linux.dev
This commit is contained in:
Jiayuan Chen 2025-03-11 19:28:08 +08:00 committed by Andrii Nakryiko
parent b02f072a36
commit 8d86767be9
1 changed files with 6 additions and 1 deletions
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7
tools/bpf/bpftool/Makefile
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@ -71,7 +71,12 @@ prefix ?= /usr/local
bash_compdir ?= /usr/share/bash-completion/completions
CFLAGS += -O2
CFLAGS += -W -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
CFLAGS += -W
CFLAGS += -Wall
CFLAGS += -Wextra
CFLAGS += -Wformat-signedness
CFLAGS += -Wno-unused-parameter
CFLAGS += -Wno-missing-field-initializers
CFLAGS += $(filter-out -Wswitch-enum -Wnested-externs,$(EXTRA_WARNINGS))
CFLAGS += -DPACKAGE='"bpftool"' -D__EXPORTED_HEADERS__ \
-I$(or $(OUTPUT),.) \