Notes
(0022657) Andreas Roth (reporter) 2010-10-22 02:05	The attached CMakeLists.txt produced the following results: -- Check for working C compiler using: Visual Studio 9 2008 -- Check for working C compiler using: Visual Studio 9 2008 -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working CXX compiler using: Visual Studio 9 2008 -- Check for working CXX compiler using: Visual Studio 9 2008 -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Looking for printf -- Looking for printf - found -- Looking for non_existing_printf -- Looking for non_existing_printf - found -- Looking for fprintf -- Looking for fprintf - found CMake Error at CMakeLists.txt:10 (MESSAGE): Found non_existing_printf And this is the Output in CMakeOutput.log: 1>------ Build started: Project: cmTryCompileExec, Configuration: Debug Win32 ------ 1>Compiling... 1>Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 15.00.30729.01 for 80x86 1>Copyright (C) Microsoft Corporation. All rights reserved. 1>cl /Od /D "WIN32" /D "_WINDOWS" /D "CHECK_FUNCTION_EXISTS=printf" /D "_DEBUG" /D "CMAKE_INTDIR=\"Debug\"" /D "_MBCS" /FD /RTC1 /MDd /Fo"cmTryCompileExec.dir\Debug\\" /Fd"C:\work\trac\test\check_function_exists\build-vs\CMakeFiles\CMakeTmp\Debug/cmTryCompileExec.pdb" /W3 /c /Zi /TC /Zm1000 1> "..\..\..\..\..\..\..\cmake\share\cmake-2.8\Modules\CheckFunctionExists.c" 1>CheckFunctionExists.c 1>Linking... 1>Embedding manifest... 1>Build log was saved at "file://c:\work\trac\test\check_function_exists\build-vs\CMakeFiles\CMakeTmp\cmTryCompileExec.dir\Debug\BuildLog.htm" [^] 1>cmTryCompileExec - 0 error(s), 0 warning(s) ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ========== Determining if the function non_existing_printf exists passed with the following output: Change Dir: C:/work/trac/test/check_function_exists/build-vs/CMakeFiles/CMakeTmp Run Build Command:C:\PROGRA~2\MICROS~1.0\Common7\IDE\devenv.com CMAKE_TRY_COMPILE.sln /build Debug /project cmTryCompileExec Microsoft (R) Visual Studio Version 9.0.30729.1. Copyright (C) Microsoft Corp. All rights reserved. ========== Build: 0 succeeded, 0 failed, 1 up-to-date, 0 skipped ========== Determining if the function fprintf exists passed with the following output: Change Dir: C:/work/trac/test/check_function_exists/build-vs/CMakeFiles/CMakeTmp Run Build Command:C:\PROGRA~2\MICROS~1.0\Common7\IDE\devenv.com CMAKE_TRY_COMPILE.sln /build Debug /project cmTryCompileExec Microsoft (R) Visual Studio Version 9.0.30729.1. Copyright (C) Microsoft Corp. All rights reserved. ========== Build: 0 succeeded, 0 failed, 1 up-to-date, 0 skipped ========== As you can see the result of the second and third CHECK_FUNCTION_EXISTS command is bogus, since MSVC thinks the output file is up-to-date.

(0022661) Bill Hoffman (manager) 2010-10-22 11:05	--debug-trycompile is only useful as a debugging tool, and is know to break things. There is a reason we wipe the directory by default. The usually usage is to setup the project so it will just run one try-compile when you do --debug-trycompile. I usually run cmake once on the whole project. Then delete the cache entry for the try-compile I am debugging, then run cmake again with --debug-trycompile. I don't think it is worth the time to make --debug-trycompile work all the time.

(0024171) David Cole (manager) 2010-12-15 12:07	This is working as intended. As Bill says in the note, --debug-trycompile is only useful as a debugging tool, and should be used only to debug one try_compile at a time...

(0026065) David Cole (manager) 2011-04-04 12:00	Closing resolved issues that have not been updated in more than 3 months.

Issue History
Date Modified	Username	Field	Change
2010-10-22 01:58	Andreas Roth	New Issue
2010-10-22 01:58	Andreas Roth	File Added: CMakeLists.txt
2010-10-22 02:05	Andreas Roth	Note Added: 0022657
2010-10-22 11:05	Bill Hoffman	Note Added: 0022661
2010-12-15 12:06	David Cole	Assigned To	=> Bill Hoffman
2010-12-15 12:06	David Cole	Status	new => assigned
2010-12-15 12:07	David Cole	Note Added: 0024171
2010-12-15 12:07	David Cole	Status	assigned => resolved
2010-12-15 12:07	David Cole	Fixed in Version	=> CMake 2.8.4
2010-12-15 12:07	David Cole	Resolution	open => no change required
2011-04-04 12:00	David Cole	Note Added: 0026065
2011-04-04 12:00	David Cole	Status	resolved => closed

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