netdev - [PATCH v2 bpf-next 4/4] bpftool: treat compilation warnings as errors

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Date:   Tue, 16 Mar 2021 20:12:57 -0700
From:   Andrii Nakryiko <andrii@...nel.org>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii@...nel.org>, <kernel-team@...com>
Subject: [PATCH v2 bpf-next 4/4] bpftool: treat compilation warnings as errors

Make bpftool compilation stricter and treat all compilation warnings as errors.

Depending on libbfd version on the system, jit_disasm.c might trigger the
following compilation warning-turned-error:

jit_disasm.c: In function ‘disasm_print_insn’:
jit_disasm.c:121:29: error: assignment discards ‘const’ qualifier from pointer
target type [-Werror=discarded-qualifiers]
   info.disassembler_options = disassembler_options;
                                ^

This was fixed in libbfd, but older versions of the library are still widely
used. So disable -Wdiscarded-qualifiers for that particular line of code.

Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
---
 tools/bpf/bpftool/Makefile     | 3 ++-
 tools/bpf/bpftool/jit_disasm.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index b3073ae84018..59de954faaf5 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -56,7 +56,8 @@ 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 -Wall -Wextra -Werror
+CFLAGS += -Wno-unused-parameter -Wno-missing-field-initializers
 CFLAGS += $(filter-out -Wswitch-enum -Wnested-externs,$(EXTRA_WARNINGS))
 CFLAGS += -DPACKAGE='"bpftool"' -D__EXPORTED_HEADERS__ \
 	-I$(if $(OUTPUT),$(OUTPUT),.) \
diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c
index e7e7eee9f172..20083fbed5c2 100644
--- a/tools/bpf/bpftool/jit_disasm.c
+++ b/tools/bpf/bpftool/jit_disasm.c
@@ -118,7 +118,10 @@ void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
 	info.arch = bfd_get_arch(bfdf);
 	info.mach = bfd_get_mach(bfdf);
 	if (disassembler_options)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
 		info.disassembler_options = disassembler_options;
+#pragma GCC diagnostic pop
 	info.buffer = image;
 	info.buffer_length = len;
 
-- 
2.30.2