Build target for component libraries

[brycelelbach]

[reported by maciek] [Trac time Wed Jan 18 17:46:13 2012] Add a build target for the components in src/components.

[brycelelbach]

[comment by hkaiser] [Trac time Wed Jan 18 22:37:58 2012] Not that I wouldn't agree with your general comments, the ESSENTIAL stuff is easy to use:

add_hpx_component(remote_object
  FOLDER "Core/Components"
  HEADER_ROOT "${hpx_SOURCE_DIR}/hpx/components/remote_object"
  AUTOGLOB ESSENTIAL)

(even if I still don't understand what it is meant to control).

[brycelelbach]

[comment by blelbach] [Trac time Mon Jan 23 17:27:10 2012] ESSENTIAL isn't hard to use, see above. If you have specific requests, please reopen this ticket (e.g. if you have a specific way to make this better).

[brycelelbach]

[comment by maciek] [Trac time Mon Jan 23 20:25:02 2012] I guess I am to blame for mentioning *_ESSENTIAL, which I incorrectly perceived as a crutch to get around the problem. Surely, you don't suggest that users who just want to get all the components compiled start messing with the cmake files or type in mile-long make command??? All I want is something like "components" pseudotarget (at least until the semantics of "make all" is clarified).

If anyone wants to continue the off-topic discussion:
What is an "essential" component?
If a component is really essential, shouldn't it be a part of HPX library?
Who decides whether a component is essential?

[brycelelbach]

[comment by blelbach] [Trac time Tue Jan 24 15:03:32 2012] r6808