On Fri, Nov 17, 2017 at 10:42 AM, Steven Watanabe via Boost <
boost@lists.boost.org> wrote:

AMDG

On 11/17/2017 09:29 AM, Stefan Seefeld via Boost wrote:

I just merged some work to GIL's `develop` branch. This notably involves
improvements to the testing infrastructure. Testing GIL is a bit
involved, as it requires various backend libraries (PNG, JPEG, TIFF,
etc.) to be installed. While the stand-alone testing works fine
(https://github.com/boostorg/gil/blob/develop/.travis.yml#L304-L306),
the integrated testing will thus fail, until the testing logic is
augmented by the necessary instructions to a) install the prerequisites
and b) invoke the build system with the appropriate flags
(https://github.com/boostorg/gil/blob/develop/io/test/Jamfile#L13-L22)

  Please use the Boost.Build modules for these libraries
instead.  You can make the tests run only when the
corresponding libraries are available, like this:

using zlib ;

run png_test.cpp
  : # args
  : # input-files
  : # requirements
    [ ac.check-library /zlib//zlib : <library>/zlib//zlib : <build>no ]
    # in English, if the library is found, use it, otherwise,
    # skip this test
;

Although ideally it should be:

import zlib ;

run ... ;

And then ask the testers to add the appropriate "using zlib ... ;" to their
configuration. And that should also include any CI testing you do also.

Is there a way for the Jamfile to add a "using zlib ;" or similar that will serve as a default, i.e. whenever the user-config.jam file doesn't contain a "using zlib " statement ? I'd like to be able to write a valid Jamfile that works (and finds prerequisite libs in default locations) without a user-config.jam, but allow users to override the paths. But right now it seems I have to add "using zlib ;" to either my user-config.jam, or the Jamfile, but not both.

Thanks,

-- 

      ...ich hab' noch einen Koffer in Berlin...