[CMake] How to use CMake with icc via configuration options when needing interprocedural optimization?

[Yuri Timenkov]

I think this could work, but if compiler is altered before project() call
(but I didn't check this and suggest set variable only if it's not already
set). Specifying only one variable  in command line looks more
user-friendly and robust than several ones.
Anther option is using initial cache.

Regards,
Yuri

On Wed, Feb 8, 2012 at 12:59 AM, Alexander Neundorf <a.neundorf-work at gmx.net
> wrote:

> Hi Janitor,
>
> On Tuesday 07 February 2012, janitor 048 wrote:
> > Hello,
> >
> > this is a question I recently asked on stackoverflow (
> >
> http://stackoverflow.com/questions/9129233/recommended-ways-to-use-cmake-wi
> > th-icc-via-configuration-options) but that has not received any response
> > since then. Maybe this mailing list is a better place to ask... Here goes
> >
> > I would like to use the Intel compiler icc (or icpc) with a CMake-based
> > project (on Linux for what it's worth). I can of course export the CXX
> > variable when calling cmake, e.g. like
> >
> > CXX=icpc cmake ../
> >
> > and this works fine. I would however like to make this choice available
> via
> > a custom option. For this I parse custom option, e.g.
> >
> > cmake -DMY_COMPILER_OPTION=Intel ..
> >
> > as
> >
> > IF (MY_COMPILER_OPTION STREQUAL "Intel")
> >   MESSAGE(STATUS "** Compiling with Intel settings **")
> >   SET(CMAKE_CXX_COMPILER "icpc")
> >   SET(CMAKE_CXX_FLAGS_RELEASE "-O3 -w")
> >   SET(CMAKE_CXX_FLAGS_DEBUG "-g")
> > ENDIF ()
>
> Don't do that, this is too late in the initialization process.
> The recommended way is to set the CXX environment variable. This is only
> necessary during the initial cmake run, afterwards this is stored in the
> cmake
> cmake cache.
> It should also work to preset the compiler variables:
> cmake -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc ....
>
> (I didn't check, but it should work).
>
> Alex
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