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

[Leif Walsh]

D'oh!  Sorry I dropped this ball, thanks again, this is the most helpful
patch ever.

Brad King <brad.king at kitware.com> writes:

> On 10/26/2012 11:22 AM, Leif Walsh wrote:
>> 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 ...).
>>
>> Sounds good, I'll send a patch soon. 
>
> I finally had time to add this test myself:
>
>  http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=306796e8
>
> -Brad


-- 
Cheers,
Leif