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

Just changed LIBOMP_USE_DEBUGGER to false.

llvm-svn: 241852

These changes enable external debuggers to conveniently interface with 
the LLVM OpenMP Library.  Structures are added which describe the important
internal structures of the OpenMP Library e.g., teams, threads, etc.
This feature is turned on by default (CMake variable LIBOMP_USE_DEBUGGER)
and can be turned off with -DLIBOMP_USE_DEBUGGER=off.

Differential Revision: http://reviews.llvm.org/D10038

llvm-svn: 241832

Currently, OMPT support requires the weak attribute which isn't supported
on Windows.  This patch has CMake error out when LIBOMP_OMPT_SUPPORT=true
and the users is building on Windows.
http://lists.cs.uiuc.edu/pipermail/openmp-dev/2015-June/000692.html

Patch by Jonas Hahnfeld

llvm-svn: 239912

Add new LIBOMP_ENABLE_ASSERTIONS macro which can be set in a standalone build
or takes the value of LLVM_ENABLE_ASSERTIONS when inside llvm/projects.  This
change also defines the KMP_BUILD_ASSERT() macro to do nothing when ENABLE_ASSERTIONS
is off.  This means the __kmp_build_check_* types won't be defined and thus, no warnings.
http://lists.cs.uiuc.edu/pipermail/openmp-dev/2015-June/000719.html

Patch by Jack Howarth and Jonathan Peyton

llvm-svn: 239546

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

This change has the CMake build system create a dynamic library named
libomp instead of libiomp5.  Also any reference to libiomp is replaced
with libomp.  One can still use the LIBOMP_LIB_NAME variable to enforce
a different name, and everything will still work as expected.  An important
note is that libiomp5 and libgomp symlinks are created at install time when
on Unix systems.  On Windows, copies are created with the legacy names.

llvm-svn: 238715

The CMAKE_OSX_ARCHITECTURES CMake variable allows users to build
universal fat libraries that contain both i386 and x86_64 code.  These
changes allow this build by having the z_Linux_asm.s file detect the architecture
itself instead of receiving it through the build system.

Also, there was a LIBOMP_OSX_ARCHITECTURES CMake variable added to allow
people to only build libomp as a fat library and not the entire LLVM/Clang system.
http://lists.cs.uiuc.edu/pipermail/openmp-dev/2015-May/000626.html

llvm-svn: 238566

Removing unnecessary spaces. For CACHE variables, putting the description string
on its own line which mimics libcxx. There are no logic changes.

Differential Revision: http://reviews.llvm.org/D9945

llvm-svn: 238219

Cached CMake variables need to have a prefix so they don't collide with other
projects. This change (a lot of simple changes) simply prefixes cached variables
with LIBOMP_ and sets all of these variables to UPPERCASE which is convention.
e.g., os => LIBOMP_OS, ompt_support => LIBOMP_OMPT_SUPPORT.

Differential Revision: http://reviews.llvm.org/D9829

llvm-svn: 237845

Added comment to CMakeLists.txt about library install directory suffix option.

llvm-svn: 237384

llvm-svn: 237360

llvm-svn: 237130

llvm-svn: 236746

This patch integrates the libiomp CMake build system into the LLVM CMake build 
system so that users can checkout libiomp into the projects directory of llvm 
and build llvm,clang, and libiomp all together.  These changes specifically 
introduce a new install target which will put libraries and headers into the 
correct locations when either a standalone build or part of llvm.
The copy_recipe() method has been removed in favor of the POST_BUILD method 
to move headers into the exports subdirectory.  And lastly, the MicroTests.cmake 
file was refactored which led to simpler target dependencies and a new target, 
make libiomp-micro-tests, which performs the 5 small tests (test-relo, 
test-touch, etc.) when called.

llvm-svn: 236534

llvm-svn: 236117

llvm-svn: 230520

added support for PPC architectures (version 3): initial patch provided by Carlo Bertolli, latest version from Johnny Peyton

llvm-svn: 226479

llvm-svn: 226272

llvm-svn: 225792

llvm-svn: 225789

understand that this is not friendly, and are working to change our
internal code-development to make it easier to make development
features available more frequently and in finer (more functional)
chunks. Unfortunately we haven't got that in place yet, and unpicking
this into multiple separate check-ins would be non-trivial, so please
bear with me on this one. We should be better in the future.

Apologies over, what do we have here?

GGC 4.9 compatibility
--------------------
* We have implemented the new entrypoints used by code compiled by GCC
4.9 to implement the same functionality in gcc 4.8. Therefore code
compiled with gcc 4.9 that used to work will continue to do so.
However, there are some other new entrypoints (associated with task
cancellation) which are not implemented. Therefore user code compiled
by gcc 4.9 that uses these new features will not link against the LLVM
runtime. (It remains unclear how to handle those entrypoints, since
the GCC interface has potentially unpleasant performance implications
for join barriers even when cancellation is not used)

--- new parallel entry points ---
new entry points that aren't OpenMP 4.0 related
These are implemented fully :-
      GOMP_parallel_loop_dynamic()
      GOMP_parallel_loop_guided()
      GOMP_parallel_loop_runtime()
      GOMP_parallel_loop_static()
      GOMP_parallel_sections()
      GOMP_parallel()

--- cancellation entry points ---
Currently, these only give a runtime error if OMP_CANCELLATION is true
because our plain barriers don't check for cancellation while waiting
        GOMP_barrier_cancel()
        GOMP_cancel()
        GOMP_cancellation_point()
        GOMP_loop_end_cancel()
        GOMP_sections_end_cancel()

--- taskgroup entry points ---
These are implemented fully.
      GOMP_taskgroup_start()
      GOMP_taskgroup_end()

--- target entry points ---
These are empty (as they are in libgomp)
     GOMP_target()
     GOMP_target_data()
     GOMP_target_end_data()
     GOMP_target_update()
     GOMP_teams()

Improvements in Barriers and Fork/Join
--------------------------------------
* Barrier and fork/join code is now in its own file (which makes it
easier to understand and modify).
* Wait/release code is now templated and in its own file; suspend/resume code is also templated
* There's a new, hierarchical, barrier, which exploits the
cache-hierarchy of the Intel(r) Xeon Phi(tm) coprocessor to improve
fork/join and barrier performance.

***BEWARE*** the new source files have *not* been added to the legacy
Cmake build system. If you want to use that fixes wil be required.

Statistics Collection Code
--------------------------
* New code has been added to collect application statistics (if this
is enabled at library compile time; by default it is not). The
statistics code itself is generally useful, the lightweight timing
code uses the X86 rdtsc instruction, so will require changes for other
architectures.
The intent of this code is not for users to tune their codes but
rather 
1) For timing code-paths inside the runtime
2) For gathering general properties of OpenMP codes to focus attention
on which OpenMP features are most used. 

Nested Hot Teams
----------------
* The runtime now maintains more state to reduce the overhead of
creating and destroying inner parallel teams. This improves the
performance of code that repeatedly uses nested parallelism with the
same resource allocation. Set the new KMP_HOT_TEAMS_MAX_LEVEL
envirable to a depth to enable this (and, of course, OMP_NESTED=true
to enable nested parallelism at all).

Improved Intel(r) VTune(Tm) Amplifier support
---------------------------------------------
* The runtime provides additional information to Vtune via the
itt_notify interface to allow it to display better OpenMP specific
analyses of load-imbalance.

Support for OpenMP Composite Statements
---------------------------------------
* Implement new entrypoints required by some of the OpenMP 4.1
composite statements.

Improved ifdefs
---------------
* More separation of concepts ("Does this platform do X?") from
platforms ("Are we compiling for platform Y?"), which should simplify
future porting.


ScaleMP* contribution
---------------------
Stack padding to improve the performance in their environment where
cross-node coherency is managed at the page level.

Redesign of wait and release code
---------------------------------
The code is simplified and performance improved.

Bug Fixes
---------
    *Fixes for Windows multiple processor groups.
    *Fix Fortran module build on Linux: offload attribute added.
    *Fix entry names for distribute-parallel-loop construct to be consistent with the compiler codegen.
    *Fix an inconsistent error message for KMP_PLACE_THREADS environment variable.

llvm-svn: 219214

llvm-svn: 215093

CMAKE buld system should meet everyone's requirements.

Enhanced CMake Build System Commit 

* Supports Linux, Mac, Windows, and Intel® Xeon Phi builds
* Supports building with gcc, icc, clang, and Visual Studio compilers
* Supports bulding "fat" libraries on OS/X with clang
* Details and documentation on how to use build system 
  are in Build_With_CMake.txt
* To use the old CMake build system (corresponds to 
  CMakeLists.txt.old), just rename CMakeLists.txt to
  CMakeLists.txt.other and rename CMakeLists.txt.old to
  CMakeLists.txt

llvm-svn: 214850

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