[CMake] Generating Source Files

[Philip Lowman]

You can run a CMake script with add_custom_command() which executes
file(blob).  Check out the "-P" flag to cmake.

On Sat, Apr 4, 2009 at 10:07 AM, Jeremy Cowgar <jeremy at cowgar.com> wrote:

> Can I trigger the FILE( GLOB .. ) to run right before the executable is
> built? Or cause the ADD_CUSTOM_COMMAND to execute the FILE( GLOB ... ) after
> it's done? This has to be able to be solved somehow...
>
> Jeremy
>
>
> Jeremy Cowgar wrote:
>
>> Hello,
>>
>> I use CMake with quite a few simple projects, however, I am migrating one
>> project that has a few Makefiles for different platforms/compilers. I am
>> running into a problem with a custom command, it's output and how to link
>> against it.
>>
>> Here is the situation. I have 1 file, say parser.e. It will be translated
>> into C. However, the tool doing the translating will split the file into
>> many C files if too large, but more than that, parser.e may include
>> common.e, version.e, johndoe.e. The translator will also translate all of
>> those. So, from parser.e, I wind up with parser_1.c, parser_2.c, common.c,
>> version.c, johndoe.c. Now, someone ads a feature to parser.e that requires
>> regex.e, well, now the translation will include regex_1.c, regex_2.c. So,
>> the thing is, I don't want to maintain that parser.e translates into XYZ,
>> ABC files because it's in such a state of flux. So, I did this:
>>
>> FILE( MAKE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/int )
>> ADD_CUSTOM_COMMAND(
>>  OUTPUT int/main.c
>>  DEPENDS ${EU_CORE_FILES} ${EU_INTERPRETER_FILES}
>>  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/int
>>  COMMAND ${TRANSLATOR} ${CMAKE_CURRENT_SOURCE_DIR}/int.ex
>> )
>> FILE( GLOB EU_INTERPRETER_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/int/*.c" )
>>
>> That makes the directory where the translated files will go, adds a custom
>> command with the output set to int/main.c which I know will *always* exist
>> after translation. Then, I set the source file list that I can later link
>> into the main application via FILE( GLOB ... ).
>>
>> The problem with this is, it seems that FILE( GLOB .. ) is running before
>> the custom command, thus, the first time I try to build, I get all sorts of
>> linking problems because EU_INTERPRETER_SOURCES is empty. Now, the next time
>> I run, it finds the files and things link properly.
>>
>
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-- 
Philip Lowman
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