On Tue, Jan 12, 2021 at 6:01 AM Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> 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@xxxxxxxxxx> > --- Makes sense. Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > 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 >
