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RE: [bgl-discuss] xlc/xlf versions of mpicc/mpif77 etc?

At 09:38 AM 5/11/2005, Andrew Siegel wrote: 
I think we all just invoke the compilers directly and include/link
explicitly (would be nice to have a wrapper though). Did you want a sample
makefile, or were you just curious if there was an alternative ...

I'm surprised that invoking the compiler directly is acceptable; the extra link information is awkward to type and error-prone. I'm trying to understand why the mpicc/mpif77/etc. scripts are not used. (It is not easy to find the correct info for compiling and linking files on BG/L; there's no obvious link on the BGL web pages, for example.) For my codes, I expect the process to be

set

MPICC = path-to-mpicc
MPIF77 = path-to-mpif77

in my Makefile, followed by

make

followed by (in many cases a script that executes more than one job)

mpirun or mpiexec

followed by a step that gathers the results of the run. Before the update, this was all that I needed to do to successfully use either the Gnu or XL compilers. This seems simple to me, but if there is an easier way, I'd like to use it. Surely you don't all remember that long link line with the various exports etc? My memory isn't that good anymore :(

Bill



-----Original Message-----
From: owner-discuss@xxxxxxxxxxxxxxx [mailto:owner-discuss@xxxxxxxxxxxxxxx]
On Behalf Of William Gropp
Sent: Wednesday, May 11, 2005 9:31 AM
To: discuss@xxxxxxxxxxxxxxx
Subject: [bgl-discuss] xlc/xlf versions of mpicc/mpif77 etc?

I had set things up so that

setenv MPICH_F77 xlf
mpif77 ...

would get you the xlf version of mpif77 (with the correct libraries and
options), and similarly for the C, F90, and C++ compilers. This also worked
with mpif77 -conf=xlf ... .  I find this particularly convenient because it
makes it easy to use existing makefiles and switch between the
compilers.  With the compiler upgrade, these have vanished.  What do people
to to use the xl compilers now?

I also noted that the mpicc script sets the compiler flags -g -O2, which it
should not do (IBM needs to fix this in the distributions).

Bill

William Gropp
http://www.mcs.anl.gov/~gropp

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William Gropp
http://www.mcs.anl.gov/~gropp 

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