I'm trying to determine how much work is required modify cmake to
support in-source build trees for multiple Makefile configurations.
Currently, given a source tree such as:
Source/
Proj1/
Proj2/
with CMakeLists.txt files at each level, it is possible to configure a
Makefile style build tree in-source, by use of
% cd Source
% cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=RELEASE
for a single configuration type, or out-of-tree using
% cd Source
% (mkdir release; cd release; cmake -G 'Unix Makefiles'
-DCMAKE_BUILD_TYPE=RELEASE)
% (mkdir debug; cd debug; cmake -G 'Unix Makefiles'
-DCMAKE_BUILD_TYPE=DEBUG)
to create separate file trees configured for each kind of configuration.
What I would like to do is to enable in-source build trees which support
multiple configurations in a single tree. I have a proposal for how it
would work, but I don't know how much of a change to the cmake code it
would take to support it.
The current in-source layout of a build tree looks like:
Source/
CMakeLists.txt
CMakeCache.txt
CMakeFiles/
... where the objects are built.
Makefile
Proj1/
CMakeLists.txt
CMakeFiles/
...
Makefile
Proj2/
CMakeLists.txt
CMakeFiles/
...
Makefile
What I want to be able to do is to generate 'Makefile' and 'CMakeFiles/'
in a subdirectory of each directory, so if I ran for example:
% cd Source
% cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=DEBUG -
DCMAKE_INLINE_BUILD_PREFIX =DEBUGBUILD
it would build the in-line tree configured for DEBUG,
Source/
DEBUGBUILD/CMakeLists.txt
DEBUGBUILD/CMakeCache.txt
DEBUGBUILD/CMakeFiles/
... where the objects are built.
DEBUGBUILD/Makefile
Proj1/
DEBUGBUILD/CMakeLists.txt
DEBUGBUILD/CMakeFiles/
...
DEBUGBUILD/Makefile
Proj2/
DEBUGBUILD/CMakeLists.txt
DEBUGBUILD/CMakeFiles/
...
DEBUGBUILD/Makefile
Of course the relative paths would be wired so as to allow it to be
built by,
% cd Source/DEBUGBUILD
% make
If this was possible, then a number of parallel configuration trees
could be built:
% cd Source
% cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=DEBUG
-DCMAKE_INLINE_BUILD_PREFIX=DEBUGBUILD
% cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=RELEASE
-DCMAKE_INLINE_BUILD_PREFIX=RELEASEBUILD
generating,
Source/
DEBUGBUILD/
RELEASEBUILD/
Proj1/
DEBUGBUILD/
RELEASEBUILD/
Proj2/
DEBUGBUILD/
RELEASEBUILD/
It would then be a simple step to insert Makefiles in the usual places
that they lived, allowing:
% cd Source
% make DEBUG RELEASE
or
% make all
or something.
Can someone with a familiarity with the cmake code base point me in the
right direction to implement this please?
Thanks,
Joe
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