[CMake] CMake rebuilds every time

[David Cole]

On Mon, Oct 22, 2012 at 6:38 AM, Arindam Mukherjee
<arindam.mukerjee at gmail.com> wrote:
> On Mon, Oct 22, 2012 at 4:06 PM, Arindam Mukherjee
> <arindam.mukerjee at gmail.com> wrote:
>> I am sorry I missed your response. Here are the details:
>>
>> 1. I have a shell / batch script which does two things:
>>     a. cd build_dir && cmake $SRC_PATH
>>     b. make   # On Unix
>>
>>     On Windows, for step b., we run
>>     devenv proj.sln /Build "Release|x86" /out <logfile_path>
>>
>> Here is the top level CMakeLists.txt:
>> http://pastebin.com/QWG4wSuf
>>
>> Here is a CMakeLists.txt in one of the subdirs:
>> http://pastebin.com/QYGCpH7k
>>
>> These are fairly representative of how the CMakeLists.txt are.
>
> I should have added - we have source files with extension ".C" (i.e.
> .C in caps) and these are meant to be C++ sources.
>
>>
>> Regards,
>> Arindam
>>
>> On Tue, Oct 16, 2012 at 9:04 PM, David Cole <david.cole at kitware.com> wrote:
>>> What does your CMakeLists look like?
>>>
>>> Only the necessary rebuild steps should be taken on an incremental build.
>>>
>>> How do you invoke a rebuild? (Just typing 'make' or some other mechanism?)
>>>
>>>
>>> On Mon, Oct 15, 2012 at 6:22 AM, Arindam Mukherjee
>>> <arindam.mukerjee at gmail.com> wrote:
>>>> Hi,
>>>>
>>>> I have a cross-platform build setup using cmake 2.8.9 which builds on
>>>> 5 different OSs. However it rebuilds every time even when neither the
>>>> Makefile timestamps nor the source file timastamps had changed.
>>>> Examining the generated Makefiles I can see that all .o, .i and .s
>>>> targets have been marked .PHONY. Don't know if this is the reason for
>>>> it. How to fix this to not rebuild every time but do incremental
>>>> builds?
>>>>
>>>> Thanks,
>>>> Arindam
>>>> --
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The *.C files will only be seen as "C" files on Windows because the
file system is case insensitive, so there is no difference between "c"
and "C"... Use ".cpp" or ".cxx" to name C++ source files.