[cfe-dev] OpenMP issue

[Jeffrey Walton via cfe-dev]

Hi Everyone,

In case you are still seeking feedback
(https://releases.llvm.org/3.7.0/tools/clang/docs/ReleaseNotes.html#openmp-support)
:

CXX=clang++ CXXFLAGS="-DNDEBUG -g2 -O3 -fopenmp=libomp" make -j 4
...

clang++ -DNDEBUG -g2 -O3 -fopenmp=libomp -DCRYPTOPP_DISABLE_MIXED_ASM
-fPIC -pthread -pipe -c nbtheory.cpp

nbtheory.cpp:16:11: fatal error: 'omp.h' file not found
# include <omp.h>
          ^~~~~~~
1 error generated.
make: *** [GNUmakefile:1587: nbtheory.o] Error 1

$ cat nbtheory.cpp
...
#ifdef _OPENMP
# include <omp.h>
#endif
...

Finally,

$ clang++ --version
clang version 6.0.1 (tags/RELEASE_601/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /bin

And:

$ clang++ --version
clang version 6.0.1 (tags/RELEASE_601/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /bin

$ lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: Fedora
Description:    Fedora release 28 (Twenty Eight)
Release:        28
Codename:       TwentyEight

GCC, ICC, MSVC, IBM XLC and SunCC are OK.

Jeff