Re: [2.6 patch] remove support for gcc < 3.2

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Thu, 2005-08-04 22:38:31 +0200, Adrian Bunk <bunk@stusta.de> wrote:
> On Thu, Aug 04, 2005 at 08:54:47AM +0200, Jan-Benedict Glaw wrote:
> >...
> > Current GCC from CVS (plus minor configury patches) seems to work. We
> > had -fno-unit-at-a-time missing in our arch Makefile which hides a bug
> > in kernel's sources.
> > 
> > I guess that if you remove -fno-unit-at-a-time from i386 and use a
> > current GCC, you'll run into that fun, too.
> 
> What bug exactly?

-fno-unit-at-a-time grounded:

jbglaw@d2:~/test_gcc/linux-2.6.13-rc5-git3$ grep fno-unit-at arch/i386/Makefile 
# CFLAGS += $(call cc-option,-fno-unit-at-a-time)

For presenting it, I built a gcc right from CVS:

jbglaw@d2:~/test_gcc/linux-2.6.13-rc5-git3$ i486-linux-gcc -v
Using built-in specs.
Target: i486-linux
Configured with: /home/jbglaw/vax-linux/scm/build-20050802-192552-i486-linux/src/gcc/configure --disable-multilib --with-newlib --disable-nls --enable-threads=no --disable-threads --enable-symvers=gnu --enable-__cxa_atexit --disable-shared --target=i486-linux --prefix=/home/jbglaw/vax-linux/scm/build-20050802-192552-i486-linux/install/usr --enable-languages=c
Thread model: single
gcc version 4.1.0 20050802 (experimental)

...and here you can see it explode even on i386:

jbglaw@d2:~/test_gcc/linux-2.6.13-rc5-git3$ make CC=i486-linux-gcc V=1 bzImage
[...]
  CHK     include/asm-i386/asm_offsets.h
make -f scripts/Makefile.build obj=init
  i486-linux-gcc -Wp,-MD,init/.main.o.d  -nostdinc -isystem /home/jbglaw/vax-linux/scm/build-20050802-192552-i486-linux/install/usr/lib/gcc/i486-linux/4.1.0/include -D__KERNEL__ -Iinclude  -Wall -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -ffreestanding -O2     -fomit-frame-pointer -pipe -msoft-float -mpreferred-stack-boundary=2 -march=i686 -mtune=pentium4 -Iinclude/asm-i386/mach-default -Wdeclaration-after-statement -Wno-pointer-sign    -DKBUILD_BASENAME=main -DKBUILD_MODNAME=main -c -o init/main.o init/main.c
init/main.c:415: error: tmp_cmdline causes a section type conflict
init/main.c:414: error: done causes a section type conflict
init/main.c:536: error: initcall_debug causes a section type conflict
include/asm/bugs.h:35: error: __setup_str_no_halt causes a section type conflict
include/asm/bugs.h:43: error: __setup_str_mca_pentium causes a section type conflict
include/asm/bugs.h:52: error: __setup_str_no_387 causes a section type conflict
init/main.c:146: error: __setup_str_nosmp causes a section type conflict
init/main.c:154: error: __setup_str_maxcpus causes a section type conflict
init/main.c:211: error: __setup_str_debug_kernel causes a section type conflict
init/main.c:212: error: __setup_str_quiet_kernel causes a section type conflict
init/main.c:220: error: __setup_str_loglevel causes a section type conflict
init/main.c:298: error: __setup_str_init_setup causes a section type conflict
init/main.c:543: error: __setup_str_initcall_debug_setup causes a section type conflict
make[1]: *** [init/main.o] Error 1
make: *** [init] Error 2

MfG, JBG

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