MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0008851CMakeCMakepublic2009-04-06 10:592016-06-10 14:30
ReporterAlexandre Feblot 
Assigned ToBill Hoffman 
PrioritynormalSeverityminorReproducibilityhave not tried
StatusclosedResolutionmoved 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0008851: Allow to globally set which compiler to use with a given file extension
DescriptionCMAKE_CXX_SOURCE_FILE_EXTENSIONS and CMAKE_C_SOURCE_FILE_EXTENSIONS are currently read-only variables, as they are:
   - overwritten by project() or enable_language() if they are set before calling these functions.
   - not taken into account anymore after calling these functions.

So the current and ugly way to let cmake know that you want, let's say all .c files considered as C++ is to set the LANGUAGE property for all of them.

Modifications to CMAKE_CXX_SOURCE_FILE_EXTENSIONS and CMAKE_C_SOURCE_FILE_EXTENSIONS values should be honored after calling project() or enable_language().

Typical use case:

project(MY_PROJECT C CXX) # also add "C" because a specific lib might need to be compiled in pure C.
list(APPEND CMAKE_CXX_SOURCE_FILE_EXTENSIONS "c")
list(REMOVE_ITEM CMAKE_C_SOURCE_FILE_EXTENSIONS "c")
add_subdirectory(...)
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Issue History
Date ModifiedUsernameFieldChange
2009-04-06 10:59Alexandre FeblotNew Issue
2009-04-06 11:03Bill HoffmanStatusnew => assigned
2009-04-06 11:03Bill HoffmanAssigned To => Bill Hoffman
2015-06-02 07:04FlorianMNote Added: 0038873
2015-06-02 07:07FlorianMNote Edited: 0038873bug_revision_view_page.php?bugnote_id=38873#r1794
2015-06-02 07:08FlorianMNote Edited: 0038873bug_revision_view_page.php?bugnote_id=38873#r1795
2015-06-02 07:15FlorianMNote Edited: 0038873bug_revision_view_page.php?bugnote_id=38873#r1796
2016-06-10 14:27Kitware RobotNote Added: 0041538
2016-06-10 14:27Kitware RobotStatusassigned => resolved
2016-06-10 14:27Kitware RobotResolutionopen => moved
2016-06-10 14:30Kitware RobotStatusresolved => closed

Notes
(0038873)
FlorianM   
2015-06-02 07:04   
(edited on: 2015-06-02 07:15)
I also would have needed this before and like to propose a quite simple solution for this:

If CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS and CMAKE_<LANG>_IGNORE_EXTENSIONS would be defined as cached variables (without FORCE) I could change/pre-define its value as I could do with CMAKE_<LANG>_FLAGS (including the possibility to set it in a toolchain file).

E.g. changing CMakeCXXCompiler.cmake.in to:

...
set(CMAKE_CXX_IGNORE_EXTENSIONS inl;h;hpp;HPP;H;o;O;obj;OBJ;def;DEF;rc;RC CACHE INTERNAL "")
set(CMAKE_CXX_SOURCE_FILE_EXTENSIONS C;M;c++;cc;cpp;cxx;mm;CPP CACHE INTERNAL "")
...

That would still need to be defined before the project()/enable_language() commands, but at least I could change the values.

Possible workaround with current versions: using one of the "hooks"/configuration variables inside e.g. CMakeCXXCompiler.cmake.in:

cmake_minimum_required(VERSION 2.8)

set(CMAKE_CXX_SYSROOT_FLAG_CODE "list(APPEND CMAKE_CXX_SOURCE_FILE_EXTENSIONS xyz)")

project(Test CXX)

add_executable(Test SomeOtherFile.xyz)
(0041538)
Kitware Robot   
2016-06-10 14:27   
Resolving issue as `moved`.

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