[cmake-developers] execute_process inconsitancy

[J Decker]

On Mon, Sep 3, 2012 at 1:04 PM, Brad King <brad.king at kitware.com> wrote:
> On 09/03/2012 03:04 PM, J Decker wrote:
>> I use this command to get the current repository version number.
>>
>> Under windows I have to use 'cmd /c ...'
>> under linux or I obviously can't use that.
>>
>> Is there a test I can do in a cmakelists to test the shell processor?
>>
>> Is there something I can do to make this the same command?
>>
>> Under windows, without cmd /c .... the output variable is blank.
>>
>>
>> if( WIN32 )
>>
>> execute_process( COMMAND cmd /c hg id -i WORKING_DIRECTORY
>> ${CMAKE_SOURCE_DIR} OUTPUT_VARIABLE TMP_CURRENT_REPO_REVISION )
>>
>> else( WIN32 )
>>
>> execute_process( COMMAND hg id -i WORKING_DIRECTORY
>> ${CMAKE_SOURCE_DIR} OUTPUT_VARIABLE TMP_CURRENT_REPO_REVISION )
>>

execute_process( COMMAND hg id -i WORKING_DIRECTORY
${CMAKE_SOURCE_DIR} OUTPUT_VARIABLE TMP_CURRENT_REPO_REVISION
ERROR_VARIABLE TMP_CURRENT_REPO_REVISION2 )
message( "1)" ${TMP_CURRENT_REPO_REVISION} )
message( "1)" ${TMP_CURRENT_REPO_REVISION2} )

both revision and revision2 are blank, (without cmd /c before)

>> endif( WIN32 )
>
> The command operates the same way on both platforms.
> My guess is that "hg" is printing to stderr on Windows.
> Try this:
>
>  execute_process(
>    COMMAND hg id -i
>    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
>    OUTPUT_VARIABLE TMP_CURRENT_REPO_REVISION
>    ERROR_VARIABLE TMP_CURRENT_REPO_REVISION
>    )
>
> -Brad