MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0015269CMakeCMakepublic2014-11-30 11:392016-06-10 14:31
ReporterDavid Zemon 
Assigned ToKitware Robot 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionmoved 
PlatformParallax Propeller P8X32AOSUbuntuOS Version14.04
Product VersionCMake 3.0.2 
Target VersionFixed in Version 
Summary0015269: Toolchain file not loaded without C language enabled
DescriptionProblem:
My toolchain file is not being loaded.

Apparent Cause:
Any time the C language is not enabled (by either 'project' or 'enable_langauge').

Normally, I have the toolchain file loaded with a file at the top of my root CMakeLists.txt file that reads:
  set(CMAKE_TOOLCHAIN_FILE ${PROPWARE_PATH}/PropellerToolchain.cmake)
but in an effort to try and debug this, I've also added the definition to my command line. No change occurred.
Steps To ReproduceReproducing the problem is straight-forward, but requires installing a toolchain as was deemed too complicated in my previous bug. For those willing to try, see instructions here: http://public.kitware.com/Bug/view.php?id=15155 [^]

I have not yet been able to reproduce this with a desktop build, but will report back if that changes.
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Issue History
Date ModifiedUsernameFieldChange
2014-11-30 11:39David ZemonNew Issue
2014-11-30 11:41David ZemonNote Added: 0037313
2014-12-01 11:14Brad KingNote Added: 0037328
2014-12-01 22:47David ZemonNote Added: 0037351
2014-12-02 09:13Brad KingNote Added: 0037353
2016-06-10 14:29Kitware RobotNote Added: 0042676
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0037313)
David Zemon   
2014-11-30 11:41   
I should clarify the apparent cause:
If I specify no languages with the project command (therefore leaving C and C++ enabled), it works fine. If I specify only C++ in the project command, it breaks and does not load my toolchain file.
(0037328)
Brad King   
2014-12-01 11:14   
FYI, if no project() command is present then CMake inserts one at line 0 of the top-level CMakeLists.txt file. This causes C and CXX to be enabled prior to execution of any other line in the CMakeLists.txt file.
(0037351)
David Zemon   
2014-12-01 22:47   
The PropWare build system is setup such that project() is required by all projects (the PROJECT_NAME variable is used throughout).

I ran into this when I had to enable a new language in a C++ project. I changed the project command from `project(my_project)` to `project(my_project CXX DAT)`. I can absolutely see users doing this as well, and that presents a real problem.

Also, sorry about the severity being "major" - that was mistake.
(0037353)
Brad King   
2014-12-02 09:13   
Returning to the problem in the description, the enable_language() and project() commands both call configure and/or load CMakeSystem.cmake:

 http://www.cmake.org/gitweb?p=cmake.git;a=blob;f=Source/cmGlobalGenerator.cxx;hb=v3.0.2#l400 [^]

which loads the toolchain file:

 http://www.cmake.org/gitweb?p=cmake.git;a=blob;f=Modules/CMakeSystem.cmake.in;hb=v3.0.2#l6 [^]

This should work regardless of what languages are enabled or not. It happens before the list of languages is even considered.
(0042676)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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