Messages in this thread | | | From | Nick Desaulniers <> | Date | Fri, 9 Dec 2022 10:26:20 -0800 | Subject | Re: [PATCH v2 4/4] objtool: Alter how HOSTCC is forced |
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On Mon, Nov 21, 2022 at 4:12 PM Ian Rogers <irogers@google.com> wrote: > > HOSTCC is always wanted when building objtool. 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. To avoid mixing CFLAGS from different compilers just > the objtool CFLAGS are determined. HOSTCFLAGS is added to these so > that command line flags can add to the CFLAGS. > > Signed-off-by: Ian Rogers <irogers@google.com> > --- > tools/objtool/Makefile | 27 ++++++++++++++++----------- > 1 file changed, 16 insertions(+), 11 deletions(-) > > diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile > index 61a00b7acae9..e550a98e2dd9 100644 > --- a/tools/objtool/Makefile > +++ b/tools/objtool/Makefile > @@ -2,16 +2,12 @@ > include ../scripts/Makefile.include > include ../scripts/Makefile.arch > > -# always use the host compiler > -AR = $(HOSTAR) > -CC = $(HOSTCC) > -LD = $(HOSTLD) > - > ifeq ($(srctree),) > srctree := $(patsubst %/,%,$(dir $(CURDIR))) > srctree := $(patsubst %/,%,$(dir $(srctree))) > endif > > +MAKE = make -S > LIBSUBCMD_DIR = $(srctree)/tools/lib/subcmd/ > ifneq ($(OUTPUT),) > LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd > @@ -36,13 +32,20 @@ INCLUDES := -I$(srctree)/tools/include \ > -I$(srctree)/tools/objtool/include \ > -I$(srctree)/tools/objtool/arch/$(SRCARCH)/include \ > -I$(LIBSUBCMD_OUTPUT)/include > -WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs
Looking closer at the V=1 diff in meld, I think this is dropping EXTRA_WARNINGS. I think you want to add those back to OBJTOOL_CFLAGS.
> -CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS) > -LDFLAGS += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS) > +WARNINGS := -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs > +OBJTOOL_CFLAGS := -Werror $(WARNINGS) -g $(INCLUDES) $(LIBELF_FLAGS) $(HOSTCFLAGS) > +OBJTOOL_LDFLAGS := $(LIBELF_LIBS) $(LIBSUBCMD) > > # Allow old libelf to be used: > elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr) > -CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED) > +OBJTOOL_CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED) > + > +# Always want host compilation. > +HOST_OVERRIDES := CC="$(HOSTCC)" EXTRA_CFLAGS="$(OBJTOOL_CFLAGS)" \ > + LD="$(HOSTLD)" AR="$(HOSTAR)" > +BUILD_HOST_OVERRIDES := CC="$(HOSTCC)" CFLAGS="$(OBJTOOL_CFLAGS)" \ > + LD="$(HOSTLD)" LDFLAGS="$(OBJTOOL_LDFLAGS)" \ > + AR="$(HOSTAR)" > > AWK = awk > MKDIR = mkdir > @@ -65,10 +68,11 @@ include $(srctree)/tools/build/Makefile.include > > $(OBJTOOL_IN): fixdep FORCE > $(Q)$(CONFIG_SHELL) ./sync-check.sh > - $(Q)$(MAKE) $(build)=objtool > + $(Q)$(MAKE) $(build)=objtool $(BUILD_HOST_OVERRIDES) > + > > $(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN) > - $(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@ > + $(QUIET_LINK)$(HOSTCC) $(OBJTOOL_IN) $(KBUILD_HOSTLDFLAGS) $(OBJTOOL_LDFLAGS) -o $@ > > > $(LIBSUBCMD_OUTPUT): > @@ -77,6 +81,7 @@ $(LIBSUBCMD_OUTPUT): > $(LIBSUBCMD): fixdep FORCE $(LIBSUBCMD_OUTPUT) > $(Q)$(MAKE) -C $(LIBSUBCMD_DIR) O=$(LIBSUBCMD_OUTPUT) \ > DESTDIR=$(LIBSUBCMD_DESTDIR) prefix= subdir= \ > + $(HOST_OVERRIDES) \ > $@ install_headers > > $(LIBSUBCMD)-clean: > -- > 2.38.1.584.g0f3c55d4c2-goog >
-- Thanks, ~Nick Desaulniers
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