Extended Description

Following recent news of Clang is OpenMP 3.1 complete, which is wonderful, I tried to use clang with OpenMP support. Before I can run any more test, it seems that the _OPENMP macro is not properly defined at all.

The following is a minimal example

#ifndef _OPENMP
#error NO OPENMP defined
#endif

int main () {}

And on compile line clang++ -fopenmp -o test test.cpp (or clang)

The following is more details of the build of clang
OS : CentOS 7 (updated daily)

LLVM subprojects in the build tree: LLVM, clang, compiler-rt, polly, clang-extra-tools, libcxx, libcxxabi

CMake options:

args="$args -DCMAKE_BUILD_TYPE=Release"
args="$args -DCMAKE_INSTALL_PREFIX=/opt/LLVM/$prefix"
args="$args -DBUILD_SHARED_LIBS=ON"
args="$args -DLLVM_ENABLE_BACKTRACES=OFF"
args="$args -DLLVM_ENABLE_CRASH_OVERRIDES=OFF"
args="$args -DLLVM_ENABLE_PEDANTIC=OFF"
args="$args -DLLVM_ENABLE_WARNINGS=OFF"
args="$args -DLLVM_INCLUDE_DOCS=OFF"
args="$args -DLLVM_INCLUDE_EXAMPLES=OFF"
args="$args -DLLVM_INCLUDE_TESTS=OFF"
args="$args -DLLVM_TARGETS_TO_BUILD=host"