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[CMake] Disable building libomptarget and add CMake switch 

Introduce OPENMP_ENABLE_LIBOMPTARGET which defaults to OFF at the moment.

libomptarget is not yet ready for prime time:
 - Offloading to NVIDIA GPUs is not completed yet (compiler, device RTL)
 - The generic ELF plugin for offloading to the host (meant for testing)
   uses a single instance of the OpenMP runtime (libomp). That is why
   omp_is_initial_device() returns 1 which makes the tests fail.
Because of these reasons, we want to disable building (and testing!)
for release 5.0.

See https://bugs.llvm.org/show_bug.cgi?id=33859

Differential Revision: https://reviews.llvm.org/D35719

llvm-svn: 309115
This commit is contained in:
Jonas Hahnfeld 2017-07-26 13:55:00 +00:00
parent df0ee9e1b9
commit 203c730719
1 changed files with 12 additions and 1 deletions
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13
openmp/CMakeLists.txt
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@ -4,9 +4,20 @@ set(OPENMP_LLVM_TOOLS_DIR "" CACHE PATH "Path to LLVM tools for testing")
add_subdirectory(runtime)
# The tests currently don't pass if the generic ELF plugin is built.
# TODO: Fix the tests and enable libomptarget by default on supported
# architectures and platforms.
set(ENABLE_LIBOMPTARGET OFF)
# Currently libomptarget cannot be compiled on Windows or MacOS X.
# Since the device plugins are only supported on Linux anyway,
# there is no point in trying to compile libomptarget on other OSes.
if (NOT (WIN32 OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin"))
if (WIN32 OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
set(ENABLE_LIBOMPTARGET OFF)
endif()
option(OPENMP_ENABLE_LIBOMPTARGET "Enable building libomptarget for offloading."
${ENABLE_LIBOMPTARGET})
if (OPENMP_ENABLE_LIBOMPTARGET)
add_subdirectory(libomptarget)
endif()