On Tue, Jan 12, 2021 at 6:01 AM Jean-Philippe Brucker jean-philippe@linaro.org wrote:
Build bpftool and resolve_btfids using the host toolchain when cross-compiling, since they are executed during build to generate the selftests. Add a host build directory in order to build both host and target version of libbpf. Build host tools using $(HOSTCC) defined in Makefile.include.
Signed-off-by: Jean-Philippe Brucker jean-philippe@linaro.org
Makes sense.
Acked-by: Andrii Nakryiko andrii@kernel.org
tools/testing/selftests/bpf/Makefile | 43 ++++++++++++++++++++++------ 1 file changed, 34 insertions(+), 9 deletions(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index c51df6b91bef..1d85565883ea 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 include ../../../../scripts/Kbuild.include include ../../../scripts/Makefile.arch +include ../../../scripts/Makefile.include
CXX ?= $(CROSS_COMPILE)g++
@@ -113,7 +114,20 @@ SCRATCH_DIR := $(OUTPUT)/tools BUILD_DIR := $(SCRATCH_DIR)/build INCLUDE_DIR := $(SCRATCH_DIR)/include BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a -RESOLVE_BTFIDS := $(BUILD_DIR)/resolve_btfids/resolve_btfids +ifneq ($(CROSS_COMPILE),) +HOST_BUILD_DIR := $(BUILD_DIR)/host +HOST_SCRATCH_DIR := $(OUTPUT)/host-tools +else +HOST_BUILD_DIR := $(BUILD_DIR) +HOST_SCRATCH_DIR := $(SCRATCH_DIR) +endif +HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a +RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
+# sort removes libbpf duplicates when not cross-building +MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf \
$(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids \$(INCLUDE_DIR))VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ @@ -157,7 +171,7 @@ $(OUTPUT)/test_stub.o: test_stub.c $(BPFOBJ) $(call msg,CC,,$@) $(Q)$(CC) -c $(CFLAGS) -o $@ $<
-DEFAULT_BPFTOOL := $(SCRATCH_DIR)/sbin/bpftool +DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
$(OUTPUT)/runqslower: $(BPFOBJ) | $(DEFAULT_BPFTOOL) $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/runqslower \ @@ -182,10 +196,11 @@ $(OUTPUT)/test_sysctl: cgroup_helpers.c
BPFTOOL ?= $(DEFAULT_BPFTOOL) $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
$(BPFOBJ) | $(BUILD_DIR)/bpftool
$(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \
OUTPUT=$(BUILD_DIR)/bpftool/ \prefix= DESTDIR=$(SCRATCH_DIR)/ install
CC=$(HOSTCC) LD=$(HOSTLD) \OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install $(Q)mkdir -p $(BUILD_DIR)/bpftool/Documentation $(Q)RST2MAN_OPTS="--exit-status=1" $(MAKE) $(submake_extras) \ -C $(BPFTOOLDIR)/Documentation \@@ -198,7 +213,16 @@ $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \ $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \ DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
-$(BUILD_DIR)/libbpf $(BUILD_DIR)/bpftool $(BUILD_DIR)/resolve_btfids $(INCLUDE_DIR): +ifneq ($(BPFOBJ),$(HOST_BPFOBJ)) +$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
../../../include/uapi/linux/bpf.h \| $(INCLUDE_DIR) $(HOST_BUILD_DIR)/libbpf$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers+endif
+$(MAKE_DIRS): $(call msg,MKDIR,,$@) $(Q)mkdir -p $@
nit: I'd just put this rule right next to MAKE_DIRS definition
@@ -211,7 +235,7 @@ else $(Q)cp "$(VMLINUX_H)" $@ endif
-$(RESOLVE_BTFIDS): $(BPFOBJ) | $(BUILD_DIR)/resolve_btfids \ +$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \ $(TOOLSDIR)/bpf/resolve_btfids/main.c \ $(TOOLSDIR)/lib/rbtree.c \ $(TOOLSDIR)/lib/zalloc.c \ @@ -219,7 +243,8 @@ $(RESOLVE_BTFIDS): $(BPFOBJ) | $(BUILD_DIR)/resolve_btfids \ $(TOOLSDIR)/lib/ctype.c \ $(TOOLSDIR)/lib/str_error_r.c $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids \
OUTPUT=$(BUILD_DIR)/resolve_btfids/ BPFOBJ=$(BPFOBJ)
CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)# Get Clang's default includes on this system, as opposed to those seen by # '-target bpf'. This fixes "missing" files on some architectures/distros, @@ -450,7 +475,7 @@ $(OUTPUT)/bench: $(OUTPUT)/bench.o $(OUTPUT)/testing_helpers.o \ $(call msg,BINARY,,$@) $(Q)$(CC) $(LDFLAGS) -o $@ $(filter %.a %.o,$^) $(LDLIBS)
-EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) \ +EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) \ prog_tests/tests.h map_tests/tests.h verifier/tests.h \ feature \ $(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32 bpf_gcc bpf_testmod.ko) -- 2.30.0