[CMake] Replace default "make all" with "make help"

[J Decker]

On Wed, Aug 2, 2017 at 8:12 AM, DKLind <davidklind at gmail.com> wrote:

> Is it possible to replace the default target of the "Unix Makefiles"
> generated Makefile of 'all' with 'help'? By default, I mean when no target
> is specified when invoking 'make', the 'all' target is assumed.


Because cmake works with so many targets, it's unlikely this would be of
much use; ninja itself has ability to specify default target, but that's
not available from CMake; also generators like Visual Studio, et al.  don't
have 'all' they have ALL_BUILD and no 'help' target.

https://cmake.org/cmake/help/v3.0/command/build_command.html
I suppose you could wrap your CMakeLists in another that checks $<target>
and if not set, then trigger cmake --build with --target help....

that's probably a really bad idea in general though.

If someone is using cmake to build though; one would think they would just
'know' that make help is a thing to do...

Or - why would you want your one project to behave any different than all
the others in the world? (or perhaps a nicer phrasing)  Why do you want to
do this?


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