[mpich2-dev] MPICH2 use of AC_C_CONST

[David Gingold]

Last night I chased down an ugly problem that showed up when I tried  
to build MPICH2 with -Wall -Werror (telling gcc to turn on more  
warnings, and to consider warnings to be errors).

The upshot is that -Wall -Werror makes autoconf believe that the  
compiler doesn't support "const", and then things go downhill from  
there.  The root cause is described here:

	http://www.nabble.com/fix-AC_C_CONST-to-work-with-CFLAGS--O2--Wall-- 
Werror-td17164627.html

...where there is some discussion about whether the problem ought to  
be fixed in autoconf.

Does MPICH2 in fact build on pre-C89 compilers?  If not, perhaps it  
would make sense to drop the use of AC_C_CONST in configure.in (as a  
poster above suggests) and to enforce that the compiler be at least C89.

-dg

--
David Gingold
Principal Software Engineer
SiCortex
Three Clock Tower Place, Suite 210
Maynard MA 01754
(978) 897-0214 x224



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