gcc 4.8 on MacOS fails depending on -arch order

[Eric Gallager]

I am surprised that it even worked at all in the first case; last I heard,
FSF GCC did not support multiple `-arch` flags at all...
See gcc docs here: http://gcc.gnu.org/onlinedocs/gcc/Darwin-Options.html

The code that the Apple version of gcc uses to support multiple arch flags
can be found here:
http://opensource.apple.com/source/gcc/gcc-5666.3/driverdriver.c



On Fri, Apr 11, 2014 at 12:53 PM, Andrew Jaffe <a.h.jaffe at gmail.com> wrote:

> I am trying to get a recent version of gcc 4.8.2 up on my machine.
>
> For a minimal source file, I get errors depending on the order of the
> -arch flags. (I have used +universal, although in fact some of these same
> errors occur even without that, strangely)
>
> Specifically,  `-arch x86_64 -arch i386` (or either of them alone) works:
>
>     % /opt/local/bin/gcc-mp-4.8 -arch x86_64 -arch i386 conftest.c
>     % /opt/local/bin/gcc-mp-4.8 -arch x86_64 -arch i386 -O3 conftest.c
>
> But `-arch i386 -arch x86_64` fails:
>
>     % /opt/local/bin/gcc-mp-4.8 -arch i386 -arch x86_64 conftest.c
>     /var/folders/6l/7gzvw1zs42sbhj7_hlrpykfm0000gv/T//cc6JCBdP.s:5:bad
> register name `%rbp'
>     /var/folders/6l/7gzvw1zs42sbhj7_hlrpykfm0000gv/T//cc6JCBdP.s:7:bad
> register name `%rsp'
>     /var/folders/6l/7gzvw1zs42sbhj7_hlrpykfm0000gv/T//cc6JCBdP.s:10:bad
> register name `%rbp'
>
>     % /opt/local/bin/gcc-mp-4.8 -arch i386 -arch x86_64 -O3 conftest.c
>
> /var/folders/6l/7gzvw1zs42sbhj7_hlrpykfm0000gv/T//ccs67E0q.s:34:FATAL:Bad
> fx_size (0x8) in fix_to_relocation_info()
>
> Help! (Disclosure: I don't think this is strictly a macports problem: I
> get the same issue using the gcc that comes with a /usr/local binary
> install of gfortran.)
>
> The minimal source:
>
>      int main ()
>      {
>       return 0;
>      }
>
> For info:
>
>     % /opt/local/bin/gcc-mp-4.8 --version
>     gcc-mp-4.8 (MacPorts gcc48 4.8.2_0+universal) 4.8.2
>     Copyright (C) 2013 Free Software Foundation, Inc.
>
>
>
> _______________________________________________
> macports-users mailing list
> macports-users at lists.macosforge.org
> https://lists.macosforge.org/mailman/listinfo/macports-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.macosforge.org/pipermail/macports-users/attachments/20140411/fabac586/attachment.html>