tools build: bpf: Append EXTRA_CFLAGS and HOST_EXTRACFLAGS#7927
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bpftool builds a bootstrap libbpf with HOSTCC, but the libbpf submake can still inherit target build flags through CFLAGS. This can break cross builds when host objects are compiled with target-only options. Since HOST_CFLAGS contains warning options that are not suitable for building libbpf, use LIBBPF_BOOTSTRAP_CFLAGS with the warning options removed to build the bootstrap libbpf. Clear EXTRA_CFLAGS so target extra flags are not mixed into the host bootstrap libbpf build. Signed-off-by: Leo Yan <leo.yan@arm.com> Acked-by: Quentin Monnet <qmo@kernel.org>
Prepare for future changes where EXTRA_CFLAGS may include flags not applicable to the host compiler. Move the HOST_CFLAGS assignment before appending EXTRA_CFLAGS to CFLAGS so that HOST_CFLAGS does not inherit flags from EXTRA_CFLAGS. Acked-by: Quentin Monnet <qmo@kernel.org> Signed-off-by: Leo Yan <leo.yan@arm.com>
Append HOST_EXTRACFLAGS to HOST_CFLAGS so that additional flags can be applied to the host compiler. Acked-by: Quentin Monnet <qmo@kernel.org> Signed-off-by: Leo Yan <leo.yan@arm.com>
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tools/scripts/Makefile.include may expand EXTRA_CFLAGS in a future change. This could alter the initialization of CFLAGS, as the default options "-g -O2" would never be set once EXTRA_CFLAGS is expanded. Prepare for this by moving the CFLAGS initialization before including tools/scripts/Makefile.include, so it is not affected by the extended EXTRA_CFLAGS. Append EXTRA_CFLAGS to CFLAGS only after including Makefile.include and place it last so that the extra flags propagate properly and can override the default options. tools/scripts/Makefile.include already appends $(CLANG_CROSS_FLAGS) to CFLAGS, the Makefile appends $(CLANG_CROSS_FLAGS) again, remove the redundant append. Signed-off-by: Leo Yan <leo.yan@arm.com> Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Append EXTRA_CFLAGS to CFLAGS so that additional flags can be applied to the compiler. Signed-off-by: Leo Yan <leo.yan@arm.com>
ASAN reports stack-buffer-overflow due to the uninitialized op_name. Initialize it to fix the issue. Fixes: 054b6c7 ("selftests/bpf: Add verifier log tests for BPF_BTF_LOAD command") Signed-off-by: Leo Yan <leo.yan@arm.com>
The urandom_read helper and its shared library are built with $(CLANG) directly rather than through the normal selftest $(CC) rules. The CFLAGS variable can contain specific flags only for $(CC) but might be imcompatible for $(CLANG) and those flags are not necessarily valid for the clang-only urandom_read build. Split the BPF selftest local flags into COMMON_CFLAGS and append them to CFLAGS for the normal build path. Use COMMON_CFLAGS directly for urandom_read and liburandom_read.so, while still filtering out -static as before. Signed-off-by: Leo Yan <leo.yan@arm.com>
The BPF selftests prefer static LLVM linking, which works for native builds but can break cross builds. Its --link-static output may include host-only libraries that are unavailable for the cross compilation, causing link failures. Avoid static LLVM linking for cross builds and use shared LLVM libraries instead. Native builds keep the existing behavior. Signed-off-by: Leo Yan <leo.yan@arm.com>
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Pull request for series with
subject: tools build: bpf: Append EXTRA_CFLAGS and HOST_EXTRACFLAGS
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1104693