selftests: net: Fix O=dir builds
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>
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@ -12,7 +12,7 @@ CCINCLUDE += -I$(SCRATCH_DIR)/include
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BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
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MAKE_DIRS := $(BUILD_DIR)/libbpf
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MAKE_DIRS := $(BUILD_DIR)/libbpf $(OUTPUT)/bpf
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$(MAKE_DIRS):
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mkdir -p $@
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@ -37,8 +37,8 @@ endif
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CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
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$(TEST_CUSTOM_PROGS): $(BPFOBJ)
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$(CLANG) -O2 -target bpf -c $(@:.o=.c) $(CCINCLUDE) $(CLANG_SYS_INCLUDES) -o $@
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$(TEST_CUSTOM_PROGS): $(OUTPUT)/%.o: %.c $(BPFOBJ) | $(MAKE_DIRS)
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$(CLANG) -O2 -target bpf -c $< $(CCINCLUDE) $(CLANG_SYS_INCLUDES) -o $@
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$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
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$(APIDIR)/linux/bpf.h \
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