[cmake-developers] [RFC] Remove `-i` from the build command for makefile generators

[Brad King]

On 05/05/2015 04:11 PM, Ben Boeckel wrote:
> Does anyone have any issue with remove `-i` from the implicit flags from
> makefile generators with the build command (ctest_build)?

We can change it with explicit options to the relevant commands and
also add a policy to change the default (leaving the explicit options
as a way to enable the old behavior).

There are two places that do this:

* The build_command() command is called by the CTest module to
  initialize the MAKECOMMAND cache entry.  This is used by
  'ctest -M $mode -T Build' to drive the build of an existing tree.
  This can be overridden by setting the cache entry manually.

* The ctest_build() command generates the build command line.
  This can be overridden by setting CTEST_BUILD_COMMAND in the
  script before calling ctest_build().  These days it just needs
  to be something like "cmake --build . --config Debug".

Both cases call GenerateCMakeBuildCommand on the global generator
to generate the "cmake --build" command line.

-Brad