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

[Eric Doenges]

By default, CMake will use /EHsc when compiling for the Windows 
platform, with no option to change this that I am aware of. If a project 
wants different settings, it needs to handle this itself. And in fact, 
LLVM 3.4.2 conditionally modifies /EHsc to /EHs-c- in 
cmake/modules/LLVMProcessSources.cmake, so I wouldn't be surprised if 
LLVM 10.0.0 does something similar (I don't have a more recent version 
of LLVM lying about, so I can't check).



To figure out what option(s) you need to set or what files you need to 
modify, you either need to ask the LLVM developers, or dig through the 
LLVM cmake project to figure out what it is doing with the /EHsc option.



Am 28.10.19 um 13:33 schrieb Osman Zakir:
Alright, thanks.  What about enabling C++ exceptions?  I tried setting 
LLVM_ENABLE_EH to On, but it didn't help.  Setting CMAKE_CXX_FLAGS to 
/EHsc doesn't help either.

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

[Mateusz Loskot]

On Mon, 28 Oct 2019 at 13:23, Eric Doenges  wrote:

> I think it is worth adding to what Mateusz wrote that the
> MSVC_RUNTIME_LIBRARY property / CMAKE_MSVC_RUNTIME_LIBRARY variable are
> only available if policy CMP0091 is set to NEW
>

Yes, indeed. FWIW, it is also documented in the frame "Note" on docs page
of the property/variable.

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

[Mateusz Loskot]

On Mon, 28 Oct 2019 at 13:09, Osman Zakir  wrote:
>
> I did read that.
> I tried to specify CMAKE_MSVC_RUNTIME_LIBRARY and MSVC_RUNTIME_LIBRARY as 
> /MT, -MT and MT, but nothing worked.

I'm sorry, but that confirms you did not read that document.

Hint 1: "The allowed values are"

Hint 2: In CMake, for XXX property there is a corresponding variable
https://cmake.org/cmake/help/v3.15/variable/CMAKE_MSVC_RUNTIME_LIBRARY.html

Best regards,
-- 
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Re: [CMake] How to Switch to Static Runtime on Command Line?

[Eric Doenges]

I think it is worth adding to what Mateusz wrote that the 
MSVC_RUNTIME_LIBRARY property / CMAKE_MSVC_RUNTIME_LIBRARY variable are 
only available if policy CMP0091 is set to NEW, which it will not be 
because LLVM's CMakeLists.txt only requires CMake 3.4.3 or later (and 
thus all policies introduced after 3.4.3 are set to OLD for 
compatibility). So if you do not want to edit LLVM's CMakeLists.txt, you 
need to use the options provided by LLVM's CMake project to control the 
build.


We select the CRT LLVM's libraries will use with the LLVM_USE_CRT_DEBUG 
and LLVM_USE_CRT_RELEASE options, i.e. to build with a static MSVC 
runtime we use


-DLLVM_USE_CRT_DEBUG=MTd -DLLVM_USE_CRT_RELEASE=MT

These options are not documented on the "Building LLVM with CMake" page, 
but can be found by looking into LLVM's cmake directory.


Am 28.10.19 um 12:53 schrieb Mateusz Loskot:

On Mon, 28 Oct 2019 at 12:22, Osman Zakir  wrote:

And I should do "-DCMAKE_MSVC_RUNTIME_LIBRARY=/MT"

Man, read the docs I pasted!!!
https://cmake.org/cmake/help/v3.15/prop_tgt/MSVC_RUNTIME_LIBRARY.html

Best regards,

--

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doen...@mvtec.com  | Tel: +49 89 457 695-0 
| www.mvtec.com 


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

[Osman Zakir]

Okay, actually I can't enable a static runtime for LLVM on the command line.  I 
was told about a patch I need to apply.
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Re: [CMake] How to Switch to Static Runtime on Command Line?

[Mateusz Loskot]

On Mon, 28 Oct 2019 at 12:22, Osman Zakir  wrote:
>
> And I should do "-DCMAKE_MSVC_RUNTIME_LIBRARY=/MT"

Man, read the docs I pasted!!!
https://cmake.org/cmake/help/v3.15/prop_tgt/MSVC_RUNTIME_LIBRARY.html

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

[Osman Zakir]

I tried "-DCMAKE_MSVC_RUNTIME_LIBRARY=MT" and also 
"-DCMAKE_MSVC_RUNTIME_LIBRARY=/MT" before that, along with 
"-DCMAKE_BUILD_TYPE=Release", but I still get "Using Release VC++ CRT: MD".  
What's going on?  I also did "-DCMAKE_CXX_FLAGS="/permissive- /EHsc /std:c++17 
/O2 /MT /D_SILENCE_ALL_CXX_DEPRECATION_WARNINGS"" but this also didn't help.  
Do you have any ideas?

The command I ran was "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"".
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Re: [CMake] How to Switch to Static Runtime on Command Line?

[Osman Zakir]

Thanks for the reply.

What about enabling C++ exceptions?

And I should do "-DCMAKE_MSVC_RUNTIME_LIBRARY=/MT" to set the runtime type to 
static, right?
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Re: [CMake] How to Switch to Static Runtime on Command Line?

[Mateusz Loskot]

On Mon, 28 Oct 2019 at 12:01, Osman Zakir  wrote:
>
> 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.

This may help (CMake 3.15 or later only):

https://cmake.org/cmake/help/latest/policy/CMP0091.html
https://cmake.org/cmake/help/v3.15/prop_tgt/MSVC_RUNTIME_LIBRARY.html

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

[Osman Zakir]

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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