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