[Openmp-dev] libomp.lib is not automatically added on Windows

Tue Aug 11 09:22:43 PDT 2015

    Doesn't visualstudio::Linker::ConstructJob() in
cfe/lib/Driver/Tools.cpp need to be expanded to handle OMPRT_OMP?
Currently that is only done in darwin::Linker::ConstructJob() and
gnutools::Linker::ConstructJob(). It seems that the same support was
never added to  visualstudio::Linker::ConstructJob().
                  Jack

On Tue, Aug 11, 2015 at 2:14 AM, İsmail Dönmez
<openmp-dev at lists.llvm.org> wrote:
> That doesn't change the result on Windows.
>
> On Tuesday, August 11, 2015, Bataev, Alexey via Openmp-dev
> <openmp-dev at lists.llvm.org> wrote:
>>
>> Johnny,
>> try to use -fopenmp=libomp. Currently -fopenmp does not turn on OpenMP
>> support.
>>
>> Best regards,
>> Alexey Bataev
>> =============
>> Software Engineer
>> Intel Compiler Team
>>
>> 10.08.2015 18:51, Peyton, Jonathan L via Openmp-dev пишет:
>>>
>>> Clang front end developers,
>>>
>>> We are having trouble getting the -fopenmp flag to work on Windows.  It
>>> appears that the linking phase does not include libomp.lib?  Below is an
>>> OpenMP hello world compilation output.
>>>
>>> -- Johnny
>>>
>>> -----Original Message-----
>>> From: İsmail Dönmez [mailto:ismail at i10z.com]
>>> Sent: Monday, August 10, 2015 10:04 AM
>>> To: Peyton, Jonathan L
>>> Subject: Re: [Openmp-dev] libomp.lib is not automatically added on
>>> Windows
>>>
>>> Hi,
>>>
>>> On Mon, Aug 10, 2015 at 6:02 PM, Peyton, Jonathan L
>>> <jonathan.l.peyton at intel.com> wrote:
>>>>
>>>> Can you include -v in the compile command and post the output?
>>>
>>> Sure:
>>>
>>> C:\Users\ismail\Desktop>clang -O2 -fms-compatibility-version=19 -fopenmp
>>> -v omp_hello.c clang version 3.8.0 (http://llvm.org/git/clang
>>> 45770fa6e4eb618277ed85044d5a2d4c962c57cf) (http://llvm.org/git/llvm
>>> 97bdbf60d9923a9e06effbb96801129070499fd5)
>>> Target: x86_64-pc-windows-msvc
>>> Thread model: posix
>>> InstalledDir: C:\Program Files\LLVM\bin
>>>   "C:\\Program Files\\LLVM\\bin\\clang.exe" -cc1 -triple
>>> x86_64-pc-windows-msvc19.0.0 -emit-obj -disable-free -main-file-name
>>> omp_hello.c -mrelocation-model pic -pic-level 2 -mthread-model posix
>>> -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu
>>> x86-64 -momit-leaf-frame-pointer -v -dwarf-column-info -resource-dir
>>> "C:\\Program Files\\LLVM\\bin\\..\\lib\\clang\\3.8.0"
>>> -internal-isystem "C:\\Program
>>> Files\\LLVM\\bin\\..\\lib\\clang\\3.8.0\\include" -internal-isystem
>>> "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\INCLUDE"
>>> -internal-isystem "C:\\Program Files (x86)\\Microsoft Visual Studio
>>> 14.0\\VC\\ATLMFC\\INCLUDE" -internal-isystem "C:\\Program Files
>>> (x86)\\Windows Kits\\10\\include\\10.0.10150.0\\ucrt"
>>> -internal-isystem "C:\\Program Files (x86)\\Windows
>>> Kits\\NETFXSDK\\4.6\\include\\um" -internal-isystem "C:\\Program Files
>>> (x86)\\Windows Kits\\8.1\\include\\shared" -internal-isystem "C:\\Program
>>> Files (x86)\\Windows Kits\\8.1\\include\\um"
>>> -internal-isystem "C:\\Program Files (x86)\\Windows
>>> Kits\\8.1\\include\\winrt" -O2 -fdebug-compilation-dir
>>> "C:\\Users\\ismail\\Desktop" -ferror-limit 19 -fmessage-length 100 -fopenmp
>>> -fnoopenmp-use-tls -mstackrealign -fms-extensions -fms-compatibility
>>> -fms-compatibility-version=19 -fdelayed-template-parsing -fobjc-runtime=gcc
>>> -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops
>>> -vectorize-slp -o
>>> "C:\\Users\\ismail\\AppData\\Local\\Temp\\omp_hello-45bdc2.o" -x c
>>> omp_hello.c clang -cc1 version 3.8.0 based upon LLVM 3.8.0svn default target
>>> x86_64-pc-windows-msvc #include "..." search starts here:
>>> #include <...> search starts here:
>>>   C:\Program Files\LLVM\bin\..\lib\clang\3.8.0\include
>>>   C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE
>>> C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE
>>> C:\Program Files (x86)\Windows Kits\10\include\10.0.10150.0\ucrt  C:\Program
>>> Files (x86)\Windows Kits\NETFXSDK\4.6\include\um  C:\Program Files
>>> (x86)\Windows Kits\8.1\include\shared  C:\Program Files (x86)\Windows
>>> Kits\8.1\include\um  C:\Program Files (x86)\Windows Kits\8.1\include\winrt
>>> End of search list.
>>>   "C:\\Program Files (x86)\\Microsoft Visual Studio
>>> 14.0\\VC\\bin\\amd64\\link.exe" -out:a.exe -defaultlib:libcmt -nologo
>>> "C:\\Users\\ismail\\AppData\\Local\\Temp\\omp_hello-45bdc2.o"
>>> omp_hello-45bdc2.o : error LNK2019: unresolved external symbol
>>> __kmpc_fork_call referenced in function main omp_hello-45bdc2.o : error
>>> LNK2019: unresolved external symbol omp_get_thread_num referenced in
>>> function .omp_outlined.
>>> omp_hello-45bdc2.o : error LNK2019: unresolved external symbol
>>> omp_get_num_threads referenced in function .omp_outlined.
>>> omp_hello-45bdc2.o : error LNK2019: unresolved external symbol
>>> __kmpc_cancel_barrier referenced in function .omp_outlined.
>>> a.exe : fatal error LNK1120: 4 unresolved externals
>>> clang.exe: error: linker command failed with exit code 1120 (use -v to
>>> see invocation)
>>>
>>> C:\Users\ismail\Desktop>
>>> _______________________________________________
>>> Openmp-dev mailing list
>>> Openmp-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>>
>>
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