bug#17598: Emacs pretest 24.3.91 - AIX - SIGSEV when customize

[Dmitry Antipov]

On 06/03/2014 09:28 AM, Gilles PION wrote:

> Could you suggest sensible configure options to rebuilt
> a definitive version and to confirm everything is OK now?

Hm...here is what I can suggest for trunk on AIX.

1. Choose the compiler.
   IIUC gcc can't create 64-bit binaries on AIX, but xlc can (-q64).
   Note build with gcc is far more well tested, and I have no ideas
   whether unexec will work for 64-bit XCOFF binary.

2. Choose CFLAGS.
   If you don't want to debug, just use '-O2' for both gcc and xlc.
   If you want to debug, add '-g3' for gcc and up to '-g9' for xlc
   (for the latter, please report your results!).
   If you want to fight for 1% with the very unexpected results, try:
     for gcc:
        - determine CPU type with 'prtconf | grep -i "Processor Type"'
          ==> Processor Type: PowerPC_POWERX (where X is Power core
          generation) and use CFLAGS='-O3 -mcpu=powerX -mtune=powerX'
     for xlc, try '-O5'.

3. Choose configuration options.

   For some weird reasons, you can't link without -lXpm (probably some
   other library from vendor's X requires it). So use:
     --without-all --with-xpm
   to get the bare minimum executable with X support. This is pretty
   enough to do basic programming tasks (i.e. editing source code).

   If you want more features, look through 'configure --help' output,
   choose the features you want, install required external libraries,
   and then try '--without-all --with-FEATURE'. Note that just
   'configure' (with no options) means the most feature-rich configuration
   which may be compiled with installed headers and libraries.

Dmitry