gcc-2.95.3 miscompiles VNC (and maybe XFree86)

[Ronald Wahl]

Hi,

I reported the following bug for pgcc-2.95.1 some time ago. Now I thought
it may be fixed in gcc-2.95.3 but it still occurs (so it's really no pgcc
bug). Now the bug description:

Compiling VNC (version 3.3.3 - but this doesn't matter much) with
-O2 -mcpu=k6 result in a segfaulting VNC server:

  $ programs/Xserver/Xvnc :1
  _XSERVTransSocketINETCreateListener: Unable to get service for `²`
  _XSERVTransMakeAllCOTSServerListeners: failed to create listener for tcp
  Segmentation fault

As I reported some time ago this bug occures on XFree86-3.3.5 (maybe all
XFree releases - not checked) too. With -fno-schedule-insns2 added to
CDEBUGFLAGS the segfault went away. So there must be a bug in instruction
scheduling (at least for -mcpu=k6). Would be nice if anyone could fix
this.

thx,
ron

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