Re: gcc 4.5 and powerpc: cannot link

[Titus von Boxberg <titus at v9g dot de>]

Am 16.05.2010 um 21:18 schrieb Khem Raj:
> On (16/05/10 20:24), Titus von Boxberg wrote:
>> All,
>> 
>> I'm trying to use CT-NG for creating a cross gcc4.5 for powerpc.
>> It fails when compiling the final compiler during configuration of libgomp,
>> complaining that the compiler cannot create executables.
>> 
>> ------
>> configure:3680: /Users/titus/tmp/ctng-ppc/targets/powerpc-unknown-linux-gnu/build/build-cc/./gcc/xgcc -B/Users/titus/tmp/ctng-ppc/targets/powerpc-unknown-linux-gnu/build/build-cc/./gcc/ -B/Volumes/HD2/x-tools/powerpc-unknown-linux-gnu/powerpc-unknown-linux-gnu/bin/ -B/Volumes/HD2/x-tools/powerpc-unknown-linux-gnu/powerpc-unknown-linux-gnu/lib/ -isystem /Volumes/HD2/x-tools/powerpc-unknown-linux-gnu/powerpc-unknown-linux-gnu/include -isystem /Volumes/HD2/x-tools/powerpc-unknown-linux-gnu/powerpc-unknown-linux-gnu/sys-include    -g -Os   conftest.c >&5
>> /Users/titus/tmp/ctng-ppc/targets/powerpc-unknown-linux-gnu/build/build-cc/./gcc/crtend.o: In function `__do_global_ctors_aux':
>> crtstuff.c:(.text+0xc): undefined reference to `_savegpr_31'
>> collect2: ld returned 1 exit status
>> configure:3684: $? = 1
>> ------
>> 
>> conftest.c contains only main() { return 0; }
>> 
>> It seems to me that I encounter this bug (with libgcc.a?)
>> 
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43810
>> 
>> Is anyone already experienced with this and has a workaround or an explanation?
> 
> This happens with -Os. If gcc does not have the below patch then try
> it out
> 
> http://gcc.gnu.org/ml/gcc-cvs/2009-09/msg00315.html

Thanks for the hint. The change you mentioned is apparently incorporated in gcc4.5.

To successfully build the cross compiler,
it suffices to remove --enable-target-optspace from the configuration parameters of gcc.
This removes Os from the compiler flags during build of the cross compiler.

In ct-ng this parameter is hardwired in scripts/build/cc/gcc.sh
Would that be a candidate for the .config-file of ct-ng?

Regards
Titus


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