I apologize for this nasty commit, but I somehow overlooked Chandler's
comment to re-indent these files to two space indention.  I know this
is a horrible commit, but I figured if it was done quickly after the 
first one, not too many conflicts would arise.

Again, I'm sorry and won't do this again.

llvm-svn: 242301

This commit improves numerous functionalities of the OpenMP CMake build 
system to be more conducive with LLVM's build system and build philosophies.
The CMake build system, as it was before this commit, was not up to LLVM's 
standards and did not implement the configuration stage like most CMake based
build systems offer (check for compiler flags, libraries, etc.) In order to
improve it dramatically in a short period of time, a large refactoring had 
to be done.
The main changes done with this commit are as follows:

* Compiler flag checks - The flags are no longer grabbed from compiler specific
  directories.  They are checked for availability in config-ix.cmake and added
  accordingly inside LibompHandleFlags.cmake.
* Feature checks were added in config-ix.cmake.  For example, the standard CMake
  module FindThreads is probed for the threading model to use inside the OpenMP
  library.
* OS detection - There is no longer a LIBOMP_OS variable, OS-specifc build logic
  is wrapped around the WIN32 and APPLE macros with !(WIN32 OR APPLE) meaning 
  a Unix flavor of some sort.
* Got rid of vestigial functions/macros/variables
* Added new libomp_append() function which is used everywhere to conditionally
  or undconditionally append to a list
* All targets have the libomp prefix so as not to interfere with any other
  project
* LibompCheckLinkerFlag.cmake module was added which checks for linker flags
  specifically for building shared libraries.
* LibompCheckFortranFlag.cmake module was added which checks for fortran flag
  availability.
* Removed most of the cruft from the translation between the perl+Makefile based
  build system and this one.  The remaining components that they share are
  perl scripts which I'm in the process of removing.

There is still more left to do.  The perl scripts still need to be removed, and
a config.h.in file (or similarly named) needs to be added with #cmakedefine lines
in it.  But this is a much better first step than the previous system.

Differential Revision: http://reviews.llvm.org/D10656

llvm-svn: 242298

Most CMake build systems put CMakeLists.txt files inside source directories where 
items need to get built. This change follows that convention by adding a new 
runtime/src/CMakeLists.txt file. An additional benefit is this helps logically 
seperate configuring with building as well. This change is mostly just copying and 
pasting the bottom half of runtime/CMakeLists.txt into runtime/src/CMakeLists.txt, 
but a few changes had to be made to get it to work. Most of those changes were to 
directory prefixes.

Differential Revision: http://reviews.llvm.org/D10344

llvm-svn: 239542

Remove runtime/CMakeLists.txt.old and runtime/src/CMakeLists.txt as
they no longer worked and were not being kept up to date.

Differential Revision: http://reviews.llvm.org/D9756

llvm-svn: 237615

llvm-svn: 225792

llvm-svn: 215093

Patch by Jack Howarth!

llvm-svn: 210025

This is not yet supported for production builds but can already produce working
binaries on OS X and Linux with clang and gcc.

The intention is to improve support to the point where it can integrate with
the LLVM runtime platform, cover all platforms, runtime/release build
configurations and run the tests.

Patch by Jack Howarth!

llvm-svn: 209994