[CMake] How to Switch to Static Runtime on Command Line?

[Juan Sanchez]

Hello,

It has been a while since I've looked at this stuff, but I do use
exceptions in my project.  So I add the /EHsc:
SET (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /fp:strict /EHsc
${WARNINGS_IGNORE}")
SET (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /fp:strict ${WARNINGS_IGNORE}")

and I also add a linker flag:
SET (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /SAFESEH:NO")
SET (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SAFESEH:NO
/NODEFAULTLIB:python3")
SET (CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} /SAFESEH:NO")

According to the M$ documentation, SAFESEH is relevant for x86, but not x64:
https://docs.microsoft.com/en-us/cpp/build/reference/safeseh-image-has-safe-exception-handlers?view=vs-2019

In order to change runtimes, I have also had to enable defaultlib's in case
they got in through other libraries or header files:
SET (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}
/NODEFAULTLIB:LIBCMT")

According to this instruction you can disable all of the libraries you do
not want:
https://docs.microsoft.com/en-us/cpp/error-messages/tool-errors/linker-tools-warning-lnk4098?view=vs-2019

For example, above I had to do:
/NODEFAULTLIB:python3

because the Python header files in my project were force linking the wrong
library.

Regards









On Mon, Oct 28, 2019 at 6:02 AM Osman Zakir <osmanzakir90 at hotmail.com>
wrote:

> 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 specifying 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.
>
> Note: I don't want to edit the CMakeLists.txt file because I want to be
> able to run "git pull" without having to stage any changes (I cloned the
> LLVM GitHub repository for the source code).
>
> Any help is appreciated.  Thanks in advance.
> --
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