llvm dev - Oct 2019 - How to Switch to Static Runtime and Enable C++ Exceptions?

Hi.

I'm trying to build LLVM 10.0.0 with CMake on the command line (Developer
Command Prompt for VS2019) and I need to know how to switch to a static runtime.
I've tried setting LLVM's variable for this, but it didn't work.  I
still have a dynamic runtime.  Along with that, I also need to know how to
enable C++ exceptions.

One thing I tried was to do "-DCMAKE_CXX_FLAGS="/std:c++17 /MT /EHsc
/permissive-"" but this also didn't work.  Specifying these on the
CXXFLAGS environment variable didn't do anything either.  I was using the
same session of the Developer Command Prompt, but I made sure to run
"refreshenv" to take the new environment from the registry before
continuing.

I did try to do "-DLLVM_ENABLE_EH=On" but I still got a warning from
CMake (from benchmarks/CMakeLists.txt, if I recall correctly) saying that using
std::regex with exceptions disabled isn't fully supported.

Any help is appreciated.  Thanks in advance (I also sent an email on the CMake
mailing list, by the way).
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I ran this command "cmake -S../llvm -G"Visual Studio 16 2019"
-Thost=x64 -DCMAKE_INSTALL_PREFIX=../install -DCMAKE_BUILD_TYPE=Release
-DCMAKE_MSVC_RUNTIME_LIBRARY=MT -DCMAKE_CXX_FLAGS="/permissive- /EHsc
/std:c++17 /O2 /MT /D_SILENCE_ALL_CXX_DEPRECATION_WARNINGS"
-DLLVM_ENABLE_RTTI=On -DLLVM_ENABLE_EH=ON -DCMAKE_CXX_STANDARD=17
-DPYTHON_HOME=C:/Users/Osman/AppData/Local/Programs/Python/Python38
-DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld;lldb;libcxx;libcxxabi"".
But I still get "Using Release VC++ CRT: MD", and also the CMake
warning: "CMake Warning at utils/benchmark/CMakeLists.txt:244 (message):
  Using std::regex with exceptions disabled is not fully supported".

Please help.
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Hi Osman,

You can’t enable the static CRT through the command-line. You would need to
apply this patch: https://reviews.llvm.org/D55056
(although it doesn’t work with lldb)

Alex.
________________________________
De : llvm-dev <llvm-dev-bounces at lists.llvm.org> de la part de Osman
Zakir via llvm-dev <llvm-dev at lists.llvm.org>
Envoyé : 28 octobre 2019 07:47:43
À : llvm-dev at lists.llvm.org <llvm-dev at lists.llvm.org>
Objet : Re: [llvm-dev] How to Switch to Static Runtime and Enable C++
Exceptions?

I ran this command "cmake -S../llvm -G"Visual Studio 16 2019"
-Thost=x64 -DCMAKE_INSTALL_PREFIX=../install -DCMAKE_BUILD_TYPE=Release
-DCMAKE_MSVC_RUNTIME_LIBRARY=MT -DCMAKE_CXX_FLAGS="/permissive- /EHsc
/std:c++17 /O2 /MT /D_SILENCE_ALL_CXX_DEPRECATION_WARNINGS"
-DLLVM_ENABLE_RTTI=On -DLLVM_ENABLE_EH=ON -DCMAKE_CXX_STANDARD=17
-DPYTHON_HOME=C:/Users/Osman/AppData/Local/Programs/Python/Python38
-DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld;lldb;libcxx;libcxxabi"".
But I still get "Using Release VC++ CRT: MD", and also the CMake
warning: "CMake Warning at utils/benchmark/CMakeLists.txt:244 (message):
  Using std::regex with exceptions disabled is not fully supported".

Please help.
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