[CMake] CHECK_FUNCTION_EXISTS

[George Neill]

Hi CMakers,

I feel rather stupid asking this question, but here I go.   I have the
following simple CMakeLists.txt file (on the windows platform, default
MSVC compiler install).


C:\Documents and Settings\gneill\Desktop\tmp>type CMakeLists.txt

PROJECT(GEORGE C)

include(CheckFunctionExists)

CHECK_FUNCTION_EXISTS(Sleep HAVE_SLEEP)
CHECK_FUNCTION_EXISTS(strtod HAVE_STRTOD)


Here's the result,

C:\Documents and Settings\gneill\Desktop\tmp>cmake .

-- Check for working C compiler: C:/Program Files/Microsoft Visual
Studio .NET 2003/Vc7/bin/cl.exe
-- Check for working C compiler: C:/Program Files/Microsoft Visual
Studio .NET 2003/Vc7/bin/cl.exe -- works
-- Check size of void*
-- Check size of void* - done
-- Looking for Sleep
-- Looking for Sleep - not found
-- Looking for strtod
-- Looking for strtod - found
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Documents and
Settings/gneill/Desktop/tmp


Is there some trick to making it find Sleep()  (which is located in
windows.h/kernel32.lib)?  It's appears to be able to find strtod which
is in the CRT.

I have also tried adding (below) with no luck,

SET(CMAKE_REQUIRED_LIBRARIES kernel32 user32)

Here's what I am seeing in CMakeFiles\CMakeError.log

Determining if the function Sleep exists failed with the following output:

Microsoft (R) Development Environment  Version 7.10.6030.
Copyright (C) Microsoft Corp 1984-2001. All rights reserved.

------ Build started: Project: cmTryCompileExec, Configuration: Debug
Win32 ------

Compiling...

Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.6030 for 80x86

Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.
cl /Od /D "WIN32" /D "_WINDOWS" /D "CHECK_FUNCTION_EXISTS=Sleep" /D "_DEBUG" /D
"CMAKE_INTDIR=\"Debug\"" /D "_MBCS" /FD /RTCs /MDd /GS /Fo"cmTryCompileExec.dir\
Debug\\" /Fd"C:/Documents and Settings/gneill/Desktop/tmp/CMakeFiles/CMakeTmp/De
bug/cmTryCompileExec.pdb" /W3 /c /Zi /TC   /Zm1000
   "\Program Files\CMake 2.4\share\cmake-2.4\Modules\CheckFunctionExists.c"
CheckFunctionExists.c
Linking...
CheckFunctionExists.obj : error LNK2019: unresolved external symbol
_Sleep referenced in function _main

Debug\cmTryCompileExec.exe : fatal error LNK1120: 1 unresolved externals

Build log was saved at "file://c:\Documents and
Settings\gneill\Desktop\tmp\CMakeFiles\CMakeTmp\cmTryCompileExec.dir\Debug\BuildLog.htm"

cmTryCompileExec - 2 error(s), 0 warning(s)

---------------------- Done ----------------------

    Build: 0 succeeded, 1 failed, 0 skipped


Maybe I just have something misconfigured (or missing something
simple) .. any suggestions?


TIA,
George.