[CMake] Shared intermediary files

Tue Feb 21 09:34:52 EST 2012

If possible, you might want to see about doing all the generation at
CMake time.  That should allow you to still build in parallel, unless
you need them to be generated differently for each one (in which case,
you should probably try to generate them in a subdirectory specific to
each target).

Aaron Meadows

From: Kevin Schmidt [mailto:kevin at eyesopen.com] 
Sent: Tuesday, February 21, 2012 8:26 AM
To: Meadows, Aaron C.; cmake at cmake.org
Subject: RE: [CMake] Shared intermediary files

Yes, for clarity, we do generate the files at build time, not cmake
time.

Kevin

From: aaron.meadows at thomsonreuters.com
[mailto:aaron.meadows at thomsonreuters.com] 
Sent: Tuesday, February 21, 2012 9:14 AM
To: Kevin Schmidt; cmake at cmake.org
Subject: RE: [CMake] Shared intermediary files

I'm not sure why there would be a conflict on the generated files
(unless you are generating them at Build time rather than at CMake
time), but you can probably solve the issue by making one version of the
Library depend on the other version, thus preventing them from building
at the same time.

Someone with more experience may be able to jump in hear and give a
better answer..

Aaron Meadows

From: Kevin Schmidt [mailto:kevin at eyesopen.com] 
Sent: Tuesday, February 21, 2012 8:09 AM
To: Meadows, Aaron C.; cmake at cmake.org
Subject: RE: [CMake] Shared intermediary files

Hi - 

  Actually, I have two calls to add_library, so they are in two
projects, but ONE solution.  They are built simultaneously by the
BUILD_ALL target

Kevin

From: aaron.meadows at thomsonreuters.com
[mailto:aaron.meadows at thomsonreuters.com] 
Sent: Tuesday, February 21, 2012 9:06 AM
To: Kevin Schmidt; cmake at cmake.org
Subject: RE: [CMake] Shared intermediary files

Can you clarify your setup just a bit?  

Do you have two ways you configure the build tree, once as Dynamic and
once as Static libraries?  And you are building both at the same time?

Or

Are you are calling add_library() twice with the same input files but
specifying SHARED on one of them, so they are all building together in
one project (i.e. Visual Studio Solution)?

Or

Doing something completely different?

Aaron Meadows

From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf
Of Kevin Schmidt
Sent: Monday, February 20, 2012 3:07 PM
To: cmake at cmake.org
Subject: [CMake] Shared intermediary files

Hello,

  I'm in the process of converting over a large, monolithic tree with
many libraries from a custom build solution over to cmake.  So far,
we've loved it.  I am wondering about others' solutions to a problem we
have encountered. 

We have more than a few cases of generated source files - for example,
Qt moc files.   These all get dumped into CMAKE_CURRENT_BINARY_DIR.
Now, the libraries we have build both static & shared, and have the same
source files.  In Visual Studio, this generates two projects in the
solution.  It seems that these do not share dependencies.  Occasionally,
this means that both libraries try to write to the generated source file
at the same time, which generates a (false) build failure.  

What do others do?  Am I misunderstanding something?

Kevin

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