Alternate build directory for CMake-based port?

[Bradley Giesbrecht]

On Aug 23, 2012, at 7:45 AM, Joshua Root wrote:

> On 2012-8-24 00:39 , Kevin Reid wrote:
>> I am interested in getting the GNU Radio ports (gnuradio-*) updated to the latest version. (Relevant ticket: <https://trac.macports.org/ticket/31475>. The maintainer has acknowledged the problem but no work has been done for 11 months.) I have not seriously attempted to work on portfiles before.
>> 
>> GNU Radio 3.6.* has switched exclusively to a CMake-based build system. For the most part, I have been able to simply apply the cmake PortGroup and modify the configuration parameters to CMake style.
>> 
>> However, GNU Radio also insists that the build directory be different from the source directory; the CMakeLists.txt file contains:
>> 
>> if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
>>    message(FATAL_ERROR "Prevented in-tree build. This is bad practice.")
>> endif(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
>> 
>> I could of course patch out this condition, but that seems unnecessarily fragile if it even works. How can I tell MacPorts to use distinct source and build directories for a CMake-based port?
>> 
>> The official build instructions are to do
>>  (in gnuradio source)
>>  mkdir build
>>  cd build
>>  cmake ../
>>  make
>> but since MacPorts takes care of these commands via its own infrastructure I don't know where to "just" insert a cd command and tweak the pathnames.
> 
> Sure, something like this should do it:
> 
> worksrcdir    ${worksrcdir}/build
> post-extract {
>    file mkdir ${worksrcpath}
> }

Wouldn't something like this be need:
configure.args      ../


Regards,
Bradley Giesbrecht (pixilla)

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