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. Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> --- tools/testing/selftests/bpf/Makefile | 46 +++++++++++++++++++++------- 1 file changed, 35 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index c51df6b91bef..95ce81513648 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 +114,15 @@ 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 VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ @@ -135,6 +144,14 @@ $(notdir $(TEST_GEN_PROGS) \ $(TEST_GEN_PROGS_EXTENDED) \ $(TEST_CUSTOM_PROGS)): %: $(OUTPUT)/% ; +# 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 \ + $(INCLUDE_DIR)) +$(MAKE_DIRS): + $(call msg,MKDIR,,$@) + $(Q)mkdir -p $@ + $(OUTPUT)/%.o: %.c $(call msg,CC,,$@) $(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@ @@ -157,7 +174,7 @@ $(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 +199,11 @@ $(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 \ @@ -198,9 +216,14 @@ $(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): - $(call msg,MKDIR,,$@) - $(Q)mkdir -p $@ +ifneq ($(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 $(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) | $(BPFTOOL) $(INCLUDE_DIR) ifeq ($(VMLINUX_H),) @@ -211,7 +234,7 @@ 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 +242,8 @@ $(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 +474,7 @@ $(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
