[CMake] "cmake --build ." and colors

[Gregoire Aujay]

Hello,

Ok tell me if I am wrong but what you're saying is that it is possible to enable a pass-thru mode for cmake --build but currently it is not implementer?

Meanwhile I finally found a workaround using the "build_command" Command that I did not see before: http://www.cmake.org/cmake/help/v2.8.11/cmake.html#command:build_command 

During CMake phase I can output all the build commands I want:
    - one with "all" target 
    - the other one with @_target_@ so I configure it later

Then I use these files to build my .bat / .sh that I can launch.

I seems to work fine, I have my colors and my compact ninja output. But now with MSVC_IDE the output is disabled, I can live with that for now :)

Regards,
Gregoire

-----Original Message-----
From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of Brad King
Sent: vendredi 17 mai 2013 17:43
To: Leif Walsh
Cc: cmake at cmake.org; Andreas Mohr
Subject: Re: [CMake] "cmake --build ." and colors

On 05/04/2013 08:12 AM, Leif Walsh wrote:
> I think the colors and carriage returns (without line feeds) are lost 
> because the build tool sees its controlling terminal is cmake, not a 
> real terminal program capable of showing color or redrawing, so it 
> doesn't output them. Cmake may be logging this stuff too (to send to 
> cdash for example) so this is kind of a responsible choice.

This is correct, but it doesn't have to be so.  In the case of a direct "cmake --build ..." invocation from a terminal CMake is not doing any special logging so it should be able to share its host terminal such that isatty() returns true for the underlying tools.

The "cmake --build ..." implementation ultimately runs through the cmSystemTools::RunSingleCommand code path:

 http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/cmSystemTools.cxx;hb=v2.8.11#l615

in order to invoke the native build command.  One could add an option to that code path to share the output pipes with the cmake process just like "ctest --launch" does in pass-thru mode:

 http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/CTest/cmCTestLaunch.cxx;hb=v2.8.11#l221
 cmsysProcess_SetPipeShared(cp, cmsysProcess_Pipe_STDOUT, 1);  cmsysProcess_SetPipeShared(cp, cmsysProcess_Pipe_STDERR, 1);

One could then activate that from the "cmake --build" call site by passing the option through all the intermediate levels of the call stack (cmake::Build and cmGlobalGenerator::Build IIRC).

-Brad
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