[CMake] CMake add_subdirectory and recompiling

[David Cole]

 On Wed, Dec 21, 2011 at 11:56 AM, Michael Wild <themiwi at gmail.com> wrote:
> On 12/21/2011 05:25 PM, André Caron wrote:
>> I've recently been surprised by the behavior of CMake when modifying
>> "CMakeLists.txt" files pointed to by "add_subdirectory()" directives.
>> I've asked the question on StackOverflow[1] and have gotten no clean
>> answer.  If anyone is interested, there is a small bounty (50 points)
>> on the question expiring in a few hours.
>>
>> The question is tad bit lengthy, so I won't duplicate here.  Any reply
>> on either the mailing list or to the linked StackOverflow question is
>> appreciated.
>>
>> Thanks!
>> André
>>
>> [1]: http://stackoverflow.com/questions/8479929/cmake-add-subdirectory-and-recompiling
>
> Get rid of the file(GLOB ...). Never, ever use it unless you know
> exactly what you're doing. Using it usually breaks something.
>
> Also, you didn't say *what* changes you made that caused a full rebuild.
> If you change anything that will show up on the command line (e.g.
> change add_definitions(), include_directories(), etc.), this will of
> course cause a rebuild.
>
> Michael
>
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I agree with the advice to get rid of file(GLOB, but I also think it's
irrelevant to the problem here. Using it should have no bearing on
what rebuilds when CMake re-runs, assuming that the set of globbed
files is the same from run to run.