mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-22 17:52:09 +00:00
17961a37ce
The BPF Makefile in net/bpf did incorrect path substitution for O=dir
builds, e.g.
make O=/tmp/kselftest headers
make O=/tmp/kselftest -C tools/testing/selftests
would fail in selftest builds [1] net/ with
clang-16: error: no such file or directory: 'kselftest/net/bpf/nat6to4.c'
clang-16: error: no input files
Add a pattern prerequisite and an order-only-prerequisite (for
creating the directory), to resolve the issue.
[1] https://lore.kernel.org/all/202212060009.34CkQmCN-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 837a3d66d6 ("selftests: net: Add cross-compilation support for BPF programs")
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20221206102838.272584-1-bjorn@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
52 lines
1.8 KiB
Makefile
52 lines
1.8 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
CLANG ?= clang
|
|
SCRATCH_DIR := $(OUTPUT)/tools
|
|
BUILD_DIR := $(SCRATCH_DIR)/build
|
|
BPFDIR := $(abspath ../../../lib/bpf)
|
|
APIDIR := $(abspath ../../../include/uapi)
|
|
|
|
CCINCLUDE += -I../../bpf
|
|
CCINCLUDE += -I../../../../../usr/include/
|
|
CCINCLUDE += -I$(SCRATCH_DIR)/include
|
|
|
|
BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
|
|
|
|
MAKE_DIRS := $(BUILD_DIR)/libbpf $(OUTPUT)/bpf
|
|
$(MAKE_DIRS):
|
|
mkdir -p $@
|
|
|
|
TEST_CUSTOM_PROGS = $(OUTPUT)/bpf/nat6to4.o
|
|
all: $(TEST_CUSTOM_PROGS)
|
|
|
|
# Get Clang's default includes on this system, as opposed to those seen by
|
|
# '-target bpf'. This fixes "missing" files on some architectures/distros,
|
|
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
|
|
#
|
|
# Use '-idirafter': Don't interfere with include mechanics except where the
|
|
# build would have failed anyways.
|
|
define get_sys_includes
|
|
$(shell $(1) $(2) -v -E - </dev/null 2>&1 \
|
|
| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
|
|
$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
|
|
endef
|
|
|
|
ifneq ($(CROSS_COMPILE),)
|
|
CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
|
|
endif
|
|
|
|
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
|
|
|
|
$(TEST_CUSTOM_PROGS): $(OUTPUT)/%.o: %.c $(BPFOBJ) | $(MAKE_DIRS)
|
|
$(CLANG) -O2 -target bpf -c $< $(CCINCLUDE) $(CLANG_SYS_INCLUDES) -o $@
|
|
|
|
$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
|
|
$(APIDIR)/linux/bpf.h \
|
|
| $(BUILD_DIR)/libbpf
|
|
$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
|
|
EXTRA_CFLAGS='-g -O0' \
|
|
DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
|
|
|
|
EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR)
|
|
|