Messages in this thread | | | From | Masahiro Yamada <> | Date | Sat, 5 Jun 2021 17:19:30 +0900 | Subject | Re: x86 - weird cross-compile build problem with try-run next-20210602 |
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On Sat, Jun 5, 2021 at 5:33 AM Valdis Klētnieks <valdis.kletnieks@vt.edu> wrote: > > I built a gcc 11.1 cross-compiler targeting x86_64, and builds > were throwing an error message: > > Makefile:149: CONFIG_X86_X32 enabled but no binutils support > > so I added some debugging to arch/x86/Makefile: > > ifdef CONFIG_X86_X32 > x32_ld_ok := $(call try-run,\ > /bin/echo -e '1: .quad 1b' | \ > $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ > $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMP.o" && \ > $(LD) -m elf32_x86_64 "$$TMP.o" -o "$$TMP",y,n) > $(warning x32_ld_ok is +$(x32_ld_ok)+ with CC=$(CC) $(KBUILD_AFLAGS) OBJ=$(OBJCOPY) LD=$(LD) ) > ifeq ($(x32_ld_ok),y) > CONFIG_X86_X32_ABI := y > > and that throws: > > arch/x86/Makefile:143: x32_ld_ok is ++ with CC=x86_64-unknown-linux-gnu-gcc -D__ASSEMBLY__ -fno-PIE -m64 OBJ=x86_64-unknown-linux-gnu-objcopy LD=x86_64-unknown-linux-gnu-ld > > Anybody have a clue why $(x32_ld_ok) is null rather than 'y' or 'n'?
What command did you run?
I see this warning message for 'make install' for example.
$ make install arch/x86/Makefile:148: CONFIG_X86_X32 enabled but no binutils support
Please add one more debug line: $(warning need-compiler is +$(need-compiler)+) and what will you get?
One quick fix is to change
ifeq ($(x32_ld_ok),y)
to
ifneq ($(x32_ld_ok),n)
But, I think moving this check to Kconfig is a more proper fix.
> (It's totally possible that my cross-compiler is broken, but I still don't see how > try-run would return null rather than 'n' in that case... I built a shell script that did the > test and that ended with $? == 0, but had a warning msg: > > + /bin/echo -e '1: .quad 1b' > + x86_64-unknown-linux-gnu-gcc -D__ASSEMBLY__ -fno-PIE -m64 -c -x assembler -o /tmp/z97 - > + x86_64-unknown-linux-gnu-objcopy -O elf32-x86-64 /tmp/z97 /tmp/z99.o > + x86_64-unknown-linux-gnu-ld -m elf32_x86_64 /tmp/z99.o -o /tmp/z98 > x86_64-unknown-linux-gnu-ld: warning: cannot find entry symbol _start; defaulting to 0000000000401000 > echo $? > + echo 0 > 0 > > >
-- Best Regards Masahiro Yamada
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