On Mon, Jan 16, 2023 at 01:57:51PM -0800, Ian Rogers wrote: > HOSTCC is always wanted when building. Setting CC to HOSTCC happens > after tools/scripts/Makefile.include is included, meaning flags are > set assuming say CC is gcc, but then it can be later set to HOSTCC > which may be clang. tools/scripts/Makefile.include is needed for host > set up and common macros in objtool's Makefile. Rather than override > CC to HOSTCC, just pass CC as HOSTCC to Makefile.build, the libsubcmd > builds and the linkage step. This means the Makefiles don't see things > like CC changing and tool flag determination, and similar, work > properly. > > Also, clear the passed subdir as otherwise an outer build may break by > inadvertently passing an inappropriate value. I tested with cross builds for s390/ppc/arm64 and it was ok some comments below thanks, jirka > > Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx> > --- > tools/bpf/resolve_btfids/Makefile | 17 +++++++---------- > 1 file changed, 7 insertions(+), 10 deletions(-) > > diff --git a/tools/bpf/resolve_btfids/Makefile b/tools/bpf/resolve_btfids/Makefile > index 76b737b2560d..515d87b32fb8 100644 > --- a/tools/bpf/resolve_btfids/Makefile > +++ b/tools/bpf/resolve_btfids/Makefile > @@ -18,14 +18,11 @@ else > endif > > # always use the host compiler > -AR = $(HOSTAR) > -CC = $(HOSTCC) > -LD = $(HOSTLD) > -ARCH = $(HOSTARCH) I wonder all the tools should use HOSTCC in the first place? seems more clear than forcing it from other makefiles subcmd even has: CC ?= $(CROSS_COMPILE)gcc LD ?= $(CROSS_COMPILE)ld AR ?= $(CROSS_COMPILE)ar which seems wrong unless I'm missing something.. should be always the host compiler, right? > +HOST_OVERRIDES := AR=$(HOSTAR) CC="$(HOSTCC)" LD="$(HOSTLD)" AR="$(HOSTAR)" \ > + ARCH=$(HOSTARCH) EXTRA_CFLAGS="$(HOSTCFLAGS) $(KBUILD_HOSTCFLAGS)" there's extra AR set and ARCH value is not in "" > + > RM ?= rm > CROSS_COMPILE = > -CFLAGS := $(KBUILD_HOSTCFLAGS) > -LDFLAGS := $(KBUILD_HOSTLDFLAGS) > > OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/ > > @@ -56,12 +53,12 @@ $(OUTPUT) $(OUTPUT)/libsubcmd $(LIBBPF_OUT): > > $(SUBCMDOBJ): fixdep FORCE | $(OUTPUT)/libsubcmd > $(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(SUBCMD_OUT) \ > - DESTDIR=$(SUBCMD_DESTDIR) prefix= \ > + DESTDIR=$(SUBCMD_DESTDIR) $(HOST_OVERRIDES) prefix= subdir= \ > $(abspath $@) install_headers > > $(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUT) > $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(LIBBPF_OUT) \ > - DESTDIR=$(LIBBPF_DESTDIR) prefix= EXTRA_CFLAGS="$(CFLAGS)" \ > + DESTDIR=$(LIBBPF_DESTDIR) $(HOST_OVERRIDES) prefix= subdir= \ > $(abspath $@) install_headers > > CFLAGS += -g \ > @@ -76,11 +73,11 @@ export srctree OUTPUT CFLAGS Q > include $(srctree)/tools/build/Makefile.include > > $(BINARY_IN): fixdep FORCE prepare | $(OUTPUT) > - $(Q)$(MAKE) $(build)=resolve_btfids > + $(Q)$(MAKE) $(build)=resolve_btfids $(HOST_OVERRIDES) > > $(BINARY): $(BPFOBJ) $(SUBCMDOBJ) $(BINARY_IN) > $(call msg,LINK,$@) > - $(Q)$(CC) $(BINARY_IN) $(LDFLAGS) -o $@ $(BPFOBJ) $(SUBCMDOBJ) $(LIBS) > + $(Q)$(HOSTCC) $(BINARY_IN) $(KBUILD_HOSTLDFLAGS) -o $@ $(BPFOBJ) $(SUBCMDOBJ) $(LIBS) > > clean_objects := $(wildcard $(OUTPUT)/*.o \ > $(OUTPUT)/.*.o.cmd \ > -- > 2.39.0.314.g84b9a713c41-goog >
