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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’ve been working on porting omniORB to HP-UX/Itanium,
and ran into a problem when using configure to generate the build files.
It manifested as an error preprocessing ir.idl with omnicpp. After much
debugging, I found that it was the build of omnicpp that was the issue.
In the traditional build process, the config.h file includes the config-hpux.h
file, which defines HAVE_ALLOCA and includes HP’s <alloca.h>.
Configure doesn’t set HAVE_ALLOCA or include <alloca.h>, so the omniORB
supplied alloca.c is used. This doesn’t work correctly on
HP-UX/Itanium with aCC compiler 6.0 and beyond. It looks like the routine
to determine stack direction changes when compiled with optimization vs. no
optimization. The simple fix is to add HAVE_ALLOCA and the #include
<alloca.h> to the acconfig.h file. More generically, configure
should test for alloca support and use the vendor supplied version, if
available. Minor changes will need to be made to both cccp.c and cexp.c
to include <alloca.h> when configure determines it is available.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This will probably also effect AIX, VMS and Linux, since
they all provide an alloca().<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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font-family:Arial'><o:p> </o:p></span></font></p>
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