[Cmake] Determining host compiler/OS from CMake

[Parag Chandra]

Thanks a lot! I managed to solve my problem yesterday with this:

IF (WIN32)
	Command
ENDIF (WIN32)

IF (UNIX)
	Command
ENDIF (UNIX)

IF (CYGWIN)
	Command
ENDIF (CYGWIN)

Seems all these defines are in the system already, but weren't
documented (at least I couldn't find them).

-----Original Message-----
From: William A. Hoffman [mailto:bill.hoffman at kitware.com] 
Sent: Friday, March 01, 2002 9:00 AM
To: Andy Cedilnik; Parag Chandra; cmake at public.kitware.com
Subject: Re: [Cmake] Determining host compiler/OS from CMake

I have added some new variables, and  found some old ones.
The following variables are now available (variables marked as **New
will 
be in cmake 1.4 or the current cvs,
the others have been around for a while.):

CMAKE_COMPILER_IS_GNUCXX - a boolean telling you if the compiler is gnu
CMAKE_SYSTEM - Win32, or the result of uname        **New
CMAKE_CXX_COMPILER - the name of the command line compiler tool (cl,
g++, 
CC, aCC, etc)
CMAKE_BUILD_TOOL - the tool that cmake is generating to, make, nmake, 
borlandmake, msdev, devenv  **New


Here is a sample list file:

IF( CMAKE_COMPILER_IS_GNUCXX )
   MESSAGE("Compiler is gnu")
ELSE( CMAKE_COMPILER_IS_GNUCXX)
   MESSAGE("Compiler is not gnu")
ENDIF( CMAKE_COMPILER_IS_GNUCXX)

MESSAGE("  system " ${CMAKE_SYSTEM}
         "  compiler " ${CMAKE_CXX_COMPILER}
         "  build tool " ${CMAKE_BUILD_TOOL}
)

Here is the output on cygwin:

Compiler is gnu
   system CYGWIN_NT-5.1-1.3.9(0.51/3/2)  compiler c++  build tool make

-Bill


At 12:14 PM 2/28/2002 -0500, Andy Cedilnik wrote:
>At 11:53 AM 2/28/2002 -0500, Bill Hoffman wrote:
>>Short answer: No, currently there is not.
>>
>>>Is there a predefined Cmake variable that I can use to determine the 
>>>compiler and/or the operating system that Cmake is running under? I d

>>>like Cmake to be able to set some flags via the ADD_DEFINITIONS
command 
>>>using this information.
>
>Not to want to start the flame fights, but it may be a good idea to add
>some minimal support for getting compiler information in CMake.
>I mean, you can always do things in your C files and determine
>what compiler it is, but we could have something like:
>CMAKE_CXX_COMPILER_TYPE, which would say something like
>gcc,  hpux-aCC,  msvc, or bcc. This way developer could do some
>tricks inside CMake versus inside source files.
>
>There is a "hacky" way of determining certain things already. For
>example you can say IF(BORLAND) for borland or IF(WIN32) IF(UNIX)
>for cygwin and so on.
>
>So, simple mechanism for describing compiler and platform:
>
>COMPILER_TYPE=gcc
>COMPILE_PLATFORM=win32
>= cygwin
>
>Comments?
>
>                         Andy
>
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