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From a6a5dba23d19f6a900b0359a7390df4a6b9a42f4 Mon Sep 17 00:00:00 2001
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From: Jerome Marchand <jmarchan@redhat.com>
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Date: Tue, 15 Mar 2022 17:59:24 +0100
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Subject: [PATCH 1/3] libbpf-tools: Allow to use different cflags for bpf
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targets
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commit 531b698cdc20 ("libbpf-tools: Enable compilation warnings for
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BPF programs") applies CFLAGS to all targets. However, some of the c
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flags typically used by distribution are not available to the bpf
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target. Add a new BPFCFLAGS macro to take care of that.
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Fixes the following compilation error on fedora:
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BPF bashreadline.bpf.o
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clang-13: warning: optimization flag '-ffat-lto-objects' is not supported [-Wignored-optimization-argument]
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clang-13: warning: argument unused during compilation: '-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1' [-Wunused-command-line-argument]
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clang-13: warning: argument unused during compilation: '-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1' [-Wunused-command-line-argument]
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clang-13: warning: argument unused during compilation: '-fstack-clash-protection' [-Wunused-command-line-argument]
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error: option 'cf-protection=return' cannot be specified on this target
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error: option 'cf-protection=branch' cannot be specified on this target
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2 errors generated.
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---
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libbpf-tools/Makefile | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/libbpf-tools/Makefile b/libbpf-tools/Makefile
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index 6bf1ed08..39af95ec 100644
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--- a/libbpf-tools/Makefile
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+++ b/libbpf-tools/Makefile
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@@ -7,6 +7,7 @@ LIBBPF_SRC := $(abspath ../src/cc/libbpf/src)
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LIBBPF_OBJ := $(abspath $(OUTPUT)/libbpf.a)
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INCLUDES := -I$(OUTPUT) -I../src/cc/libbpf/include/uapi
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CFLAGS := -g -O2 -Wall
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+BPFCFLAGS := -g -O2 -Wall
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INSTALL ?= install
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prefix ?= /usr/local
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ARCH := $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/' | sed 's/ppc64le/powerpc/' | sed 's/mips.*/mips/')
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@@ -106,7 +107,7 @@ $(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(OUTPUT)
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$(OUTPUT)/%.bpf.o: %.bpf.c $(LIBBPF_OBJ) $(wildcard %.h) $(ARCH)/vmlinux.h | $(OUTPUT)
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$(call msg,BPF,$@)
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- $(Q)$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) \
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+ $(Q)$(CLANG) $(BPFCFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) \
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-I$(ARCH)/ $(INCLUDES) -c $(filter %.c,$^) -o $@ && \
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$(LLVM_STRIP) -g $@
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--
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2.35.1
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