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

I would really like to know about how to apply the patch for making MSVC-built
LLVM executables lighter.  But aside from that, I also want to know what LLVM
does to CMake's default setting of /EHsc.  I want to keep that setting on,
but I can't figure out how.  Any help is appreciated.  Thanks in advance. 
P.S. The CMAKE_CXX_FLAGS variable isn't helping at all, otherwise I
wouldn't be asking this.
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Try setting LLVM_ENABLE_EH to ON on the CMake command line.

On Mon, Oct 28, 2019 at 7:38 AM Osman Zakir via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I would really like to know about how to apply the patch for making
> MSVC-built LLVM executables lighter.  But aside from that, I also want to
> know what LLVM does to CMake's default setting of /EHsc.  I want to
keep
> that setting on, but I can't figure out how.  Any help is appreciated.
> Thanks in advance.  P.S. The CMAKE_CXX_FLAGS variable isn't helping at
all,
> otherwise I wouldn't be asking this.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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It sounds like you probably need to dig into the CMake logic a little bit
and find out where the _HAS_EXCEPTIONS=0 define is coming from.  Not many
people (maybe nobody) uses this configuration, so it's not surprising that
it may have some issues.

On Mon, Oct 28, 2019 at 9:36 AM Osman Zakir <osmanzakir90 at hotmail.com>
wrote:
> I already did that.  CMake still gives me a warning from
> utils/benchmark/CMakeLists.txt saying that using std::regex with exceptions
> disabled isn't fully supported.
>
>
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I'll try to do it all from within the IDE.  I noticed that the /EHsc flag is
already there (makes me wonder why CMake still gave that warning).  But I also
noticed something else.  What's the reason for this in the Post-Build Event
command line for INSTALL.vcxproj?

"
setlocal
"C:\Program Files\CMake\bin\cmake.exe" -DBUILD_TYPE=$(Configuration)
-P cmake_install.cmake​
if %errorlevel% neq 0 goto :cmEnd​
:cmEnd​
endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone​
:cmErrorLevel​
exit /b %1​
:cmDone​
if %errorlevel% neq 0 goto :VCEnd
"

Also, libclang.vcxproj has a static runtime set but it was also set to build a
DLL instead of a static .lib library.  I changed it to have it build a static
library.  I wonder if that's a good idea.
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