Thanks a lot Eric for the clear explanation.
Eric
Eric Noulard a écrit :
I did forget the ML.
---------- Forwarded message ----------
From: Eric Noulard <eric.noul...@gmail.com>
Date: 2011/9/9
Subject: Re: [CMake] 64 bit flags
To: pellegrini <pellegr...@ill.fr>
2011/9/9 pellegrini <pellegr...@ill.fr>:
Hello everybody,
I have a Fortran project that is currently built (using gfortran, g95 or
ifort) on 32 bits machines but that might need quite soon to be built on 64
bit machines as well.
Does cmake automatically detect the processor architecture and add the 64
bit flag at configuration time or do I have to declare those flags through,
for example, a '-D option ?
CMake chose the default target architecture of your compiler so
if the default target ofthe compiler is 64bits no need for special flags.
To be more clear:
If I compile some code on a 32bits host the compiler
(C, Fortran or whatever) usually produce 32bits binaries
If I compile some code on a 64 bits host the compiler
(C, Fortran or whatever) usually produce 64bits binaries
So CMake detect the compiler (C; Fortran, ...) and do not care
about 32/64 bits issue.
Now if YOUR code as 32/64 bits specific zone then you need an appropriate
macro whose definition may be done by you (in CMakeLists.txt) by testing
the value of CMAKE_SIZEOF_VOID_P.
Now some platform like Mac OS support multi-arch binaries and if you
crawl the mail archive you'll find discussion about that.
--
Erk
Membre de l'April - « promouvoir et défendre le logiciel libre » -
http://www.april.org
--
Eric Pellegrini
Calcul Scientifique
Institut Laue-Langevin
Grenoble, France
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