[CMake] [PATCH] Optionally skip link dependencies on shared library files

[Leif Walsh]

Sounds good, I'll send a patch soon. 

Sent from my iPhone

On Oct 26, 2012, at 11:13, Brad King <brad.king at kitware.com> wrote:

> On 10/26/2012 10:39 AM, Leif Walsh wrote:
>> Sure thing. Can you let me know where to find an example test? I'll pattern match one over the weekend.
> 
> Most CMake tests just verify that binaries build correctly.
> The "Tests/BuildDepends" test is the only one that actually
> tests rebuild behavior.  It has custom commands to build a
> sub-project in its Project subdirectory multiple times while
> making modifications in between.
> 
> You'll have to modify the inner test project to add a shared
> library and an executable that links to it.  Set the new
> property on the executable only.  After the first build,
> verify that the executable's time is newer than the library
> time.  Between builds, modify a the shared library source
> (which of course will have to be in the build tree to avoid
> modifying CMake's source tree).  After the second build
> verify that the library is newer than the executable.
> 
> Checking the file times is probably most easily done as a
> custom target on the inner project that depends on the
> executable.  Its COMMAND should run a cmake script and
> pass -Dexe=$<TARGET_FILE:exe> -Dlib=$<TARGET_FILE:lib> to
> it.  The script can compare the ${lib} and ${exe} file
> times with if(... FILE_IS_NEWER ...).
> 
> Thanks,
> -Brad