[patch] Update build flags for new compiler feature

Dave Korn dave.korn.cygwin@googlemail.com
Sat Oct 3 13:17:00 GMT 2009

Corinna Vinschen wrote:

> Btw., I also had to set --disable-__cxa_atexit in contrast to your
> --enable-__cxa_atexit.  If I don't do that, I get undefined reference
> errors (some dso_foo and cxa_foo functions) when building libstdc++.

  Yes, that's just a dumbass typo on my part.  I meant to fix it a version or
two ago but it slipped my mind and I didn't remember because it gets
suppressed somehow on a native build.

> Apparently.  There's no line containing __wrap__Znaj in config.log.

  Yeh, that proves I'm using the wrong sort of autoconf test.  Argh, thanks
for finding that out for me.

>> "-DUSE_CYGWIN_LIBSTDCXX_WRAPPERS=1" into the CFLAGS.  Meanwhile, I need to go
> Thanks, I'll try that.

  That really ought to work.  Let me know if it does; I'm still holding back
on committing that patch to the flags.

> While you're at it, there is another problem.  When building gcc-4.3.4
> as cross, the auto-host.h file contains
>   #ifndef USED_FOR_TARGET
>   /* #undef HAVE_GAS_ALIGNED_COMM */
>   #endif
> afterwards.  That's quite unlucky, since options.c contains an
> unconditional
>   int use_pe_aligned_common = HAVE_GAS_ALIGNED_COMM;
> So, right now I had to define HAVE_GAS_ALIGNED_COMM to 1 manually in
> auto-host.h.

  *headdesk*  Right, one more for the to-do list, thanks for finding it.

> And, while we're at it, how do I switch on the TSAWARE flag by default?

  I'm planning to add it to LINK_SPEC in gcc/config/i386/cygwin.h.

  I'll start building 4.3.4-2 on Monday.  Busy this weekend.


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