[CMake] SET_CXX_COMPILER

[Ian.Appru at ubs.com]

Hi,

I found following commands worked ok with bash on linux and solaris

>set PATH=<path to compiler>:$PATH
>CXX=gcc && bootstrap

Regards
Ian

-----Original Message-----
From: cmake-bounces+ian.appru=ubs.com at cmake.org [mailto:cmake-bounces+ian.appru=ubs.com at cmake.org] On Behalf Of Sören Freudiger
Sent: 16 February 2006 17:48
To: cmake at cmake.org
Subject: AW: [CMake] SET_CXX_COMPILER

hmm, sorry about to say that, but:
this doesn't seems to work.

bash:
export CXX="gcc" 
or
export CXX="mpicxx"

CMakeLists.txt
MESSAGE(${CMAKE_CXX_COMPILER})

results in "ccmake ."
c++

and is CMAKE_CXX_COMPILER set to: /usr/bin/c++

what can I do?

I tested the last stable cmake version 2.2 patch 3 and 2.2 develop from CVS

Kind regards,
CMakeAnn

-----Ursprüngliche Nachricht-----
Von: William A. Hoffman [mailto:billlist at nycap.rr.com]
Gesendet: Donnerstag, 16. Februar 2006 14:03
An: Sören Freudiger; cmake at cmake.org
Betreff: Re: [CMake] SET_CXX_COMPILER

At 03:12 AM 2/16/2006, Sören Freudiger wrote:
>Hi folks
>
>two questions:
>
>1. my macro:
>  MACRO(SET_CXX_COMPILER compiler)
>    SET(CMAKE_CXX_COMPILER ${compiler} CACHE STRING "C++ compiler" 
>FORCE)
>  ENDMACRO(SET_CXX_COMPILER)
>
>and my implementation:
>  SET_CXX_COMPILER("distcc mpicxx")
>  
>results in a build.cmake file with
>
>  distcc\ mpicxx ...
>
>the problem is the backslash "\" before the blank. How can the be avoided?
>Like this I cannot execute make.
>
>2. why does the compiler not change at the build.cmake file by changing 
>the
>C++ compiler within the advanced options in ccmake? I can set the 
>C++ compiler
>within ccmake e.g. to gcc, but I always get the "c++"-compiler at the 
>build file?
>(of course only if I am not using my SET_CXX_COMPILER macro...). 
>
>Hoping for answers,
>QuestAnn

Because of the way the compiler is tested and used for setting things up, it is not a good idea to change it after the language has been enabled.
The way to do what you want is this:

export CXX = "distcc mpicxx"
cmake ../project

You can tell cmake what compiler to use before running cmake with the environment variables CC and CXX.  However, I seem to remember a bug with this, and you may have to use CVS cmake for this to work correctly.

-Bill

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