[CMake] Need help generating a config file

[Aaron Boxer]

Thanks a lot, Eric.

So, I have two cmake variables, and I want to #define FOO_DEFINE if
one or the other is set, otherwise I don't want FOO_DEFINE defines at all.

Is this possible ?



On Thu, Oct 13, 2016 at 3:27 PM, Eric Noulard <eric.noulard at gmail.com>
wrote:

>
>
> 2016-10-13 21:18 GMT+02:00 Aaron Boxer <boxerab at gmail.com>:
>
>> Hello,
>>
>> I have a     foo.h.cmake.in     file that I am using to generate a
>> foo_config.h    file.
>>
>> Here is the line in my cmake file that generates the header:
>>
>> configure_file(${CMAKE_CURRENT_SOURCE_DIR}/foo.h.cmake.in
>>   ${CMAKE_CURRENT_BINARY_DIR}/foo_config.h @ONLY)
>>
>
>
> You specified @ONLY option which means that only @VARNAME@ will be
> processed
> and not ${VARNAME}
>
>
>>
>>
>> I would like to define or undefine DEFINE in the config file
>> based on some cmake variables.
>>
>>
>> Here is my line in the foo.h.cmake.in file:
>>
>> #cmakedefine FOO_DEFINE ${SOME_CMAKE_VARIABLE}
>>
>
> Either you drop the @ONLY option of configure_file or you write
>
> #cmakedefine FOO_DEFINE @SOME_CMAKE_VARIABLE@
>
> and you should get what you want.
> @ONLY is very useful when you configure some kind of shell script template
> where $ shoudn't be interpreted by CMake condigure_file because it's meant
> to kept
> as is in the resulting configured file.
>
>
>
>>
>> However, I only get
>>
>> #define FOO_DEFINE ${SOME_CMAKE_VARIABLE}
>>
>> in the foo_config.h file.
>>
>>
>> Thanks,
>> Aaron
>>
>>
>>
>>
>>
>>
>> --
>>
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>
>
>
> --
> Eric
>
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