Re: Build failure with gcc 8.1

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Hi Greet,

On Wed, Sep 12, 2018 at 09:22:50AM +0200, Geert Uytterhoeven wrote:
Hi Mike,

On Wed, Sep 12, 2018 at 9:13 AM Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> wrote:
I'm having troubles with building the current -mm tree for m68k with
gcc-8.1.0.

$ export ARCH=m68k
$ export CROSS_COMPILE=/opt/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-
$ make O=/home/rppt/build/cross/m68k/defconfig defconfig all

  ...

  GEN     .version
  CHK     include/generated/compile.h
  AR      built-in.a
  LD      vmlinux.o
  MODPOST vmlinux.o
drivers/rtc/rtc-proc.o: In function `is_rtc_hctosys.isra.0':
rtc-proc.c:(.text+0x2a0): undefined reference to `strcmp'
/home/rppt/git/linux/Makefile:1040: recipe for target 'vmlinux' failed
make[1]: *** [vmlinux] Error 1
make[1]: Leaving directory '/home/rppt/build/cross/m68k/defconfig'
Makefile:146: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2

I've checked with several other configs and it seems that CONFIG_MMU=y and
CONFIG_MMU_MOTOROLA=y are causing the trouble.

The same configs are buildable with gcc-4.9.0.

Please check
https://lore.kernel.org/lkml/28ebe45d-3dbd-2a82-f537-b0725f7a2bcf@xxxxxxxxxxxxx/

Does that help? Thanks!

Yes, this explains what went wrong, thanks!
 
Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds


-- 
Sincerely yours,
Mike.




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