x86 build failure : __sync_sub_and_fetch_4

[Dagobert Michelsen]

Hi Riccrdo,

Am 09.12.2015 um 15:17 schrieb Riccardo Mottola <rmottola at opencsw.org>:
> while building a new release of gnustep-base, I get this failure on unstable9x
> 
> Making all for tool autogsdoc...
> /opt/csw/bin/gcc-4.6      -m32 -march=i386 -L/opt/csw/GNUstep/lib -L/opt/csw/lib -shared-libgcc  -pthread -fexceptions -fgnu-runtime -o obj/autogsdoc \
>        ./obj/autogsdoc.obj/autogsdoc.m.o ./obj/autogsdoc.obj/AGSParser.m.o ./obj/autogsdoc.obj/AGSOutput.m.o ./obj/autogsdoc.obj/AGSIndex.m.o ./obj/autogsdoc.obj/AGSHtml.m.o \
>          -L../Source/./obj -L/home/rmottola/GNUstep/Library/Libraries -L/opt/csw/GNUstep/Local/Library/Libraries -L/opt/csw/GNUstep/System/Library/Libraries -L/opt/csw/GNUstep/Local/Library/Libraries -L/opt/csw/GNUstep/Local/Library/Libraries -L/opt/csw/GNUstep/System/Library/Libraries -L/opt/csw/lib -lgnustep-base   -lpthread -lobjc   -lsocket -lnsl -lm
> Undefined                       first referenced
> symbol                             in file
> __sync_sub_and_fetch_4              ../Source/./obj/libgnustep-base.so
> __sync_add_and_fetch_4              ../Source/./obj/libgnustep-base.so
> ld: fatal: Symbol referencing errors. No output written to obj/autogsdoc
> 
> Have you aready experienced something like that?

Sure:
  http://wiki.opencsw.org/porting-faq#toc8

> From what I could gather from the internet, this is caused by forcing i386 because those functions are available only on >= 486 as atomic function.
> If someone can confirm that this is the problem, is it it reasonable to compile for 486 and up only? What's the best way to set march ?

I doubt you can run on a CPU which does not support 486 commands, so it is most certainly ok.


Best regards

  — Dago

--
"You don't become great by trying to be great, you become great by wanting to do something,
and then doing it so hard that you become great in the process." - xkcd #896

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