Compiling with Clang on Windows doesn't respect b_vscrt option #14571
Description
Describe the bug
Setting the b_vscrt variable does not have any effect when Clang is used to compile the project.
To Reproduce
meson.build:
project('simple', 'cpp')
executable('myexe', 'source.cpp')
source.cpp:
#include <iostream>
int main()
{
std::cout << "Hello World\n";
}
native.ini:
[built-in options]
b_vscrt = 'md'
meson setup --native-file native.ini builddir
The Meson build system
Version: 1.8.0
Source dir: D:\git\msn
Build dir: D:\git\msn\builddir
Build type: native build
Project name: simple
Project version: undefined
C++ compiler for the host machine: clang++ (clang 20.1.0 "clang version 20.1.0")
C++ linker for the host machine: clang++ link 14.43.34809.0
Host machine cpu family: x86_64
Host machine cpu: x86_64
Build targets in project: 1
simple undefined
User defined options
Native files: native.ini
Found ninja-1.12.1 at C:\vim\vim91\ninja.EXE
meson compile -C builddir
INFO: autodetecting backend as ninja
INFO: calculating backend command to run: C:\vim\vim91\ninja.EXE -C D:/git/msn/builddir
ninja: Entering directory `D:/git/msn/builddir'
[2/2] Linking target myexe.exe
This produces an executable that depends only on the kernel32.dll:
Meaning it continues to use the default option for the standard library https://github.com/llvm/llvm-project-release-prs/blob/b3a30dc094050d74a3d5d1a1e2406ca648c7d67d/clang/lib/Driver/ToolChains/Clang.cpp#L4533-L4540 that is the statically linked one.
Expected behavior
b_vscrt value should set -fms-runtime-lib on the compiler command line command line
By changing the native.ini file to:
[built-in options]
cpp_args = ['-fms-runtime-lib=dll']
cpp_link_args = ['-Xlinker', '/NODEFAULTLIB:libcmt']
Compiling produces the executable which links to the expected dynamic library:
Admittedly, there is some weirdness going on, that the link flags need to be added too, but there is an another issue open for that on the LLVM project llvm/llvm-project#129881
system parameters
- Is this a cross build or just a plain native build (for the same computer)?
- native build
- what operating system (e.g. MacOS Catalina, Windows 10, CentOS 8.0, Ubuntu 18.04, etc.)
- Windows 11
- what Python version are you using e.g. 3.8.0
- Python 3.12.4
- what
meson --version- 1.8.0
- what
ninja --versionif it's a Ninja build- 1.12.1