This repository provides Windows MSVC headers and libraries with a standardized sysroot rule as what GCC and Clang do, similar to other triplets, to facilitate cross-compilation and canadian-compilation. Some people prefer to use ${cpu}-windows-msvc triplet over ${cpu}-windows-gnu triplet, so I decide to provide one by myself.

Clang's winsysroot is pretty useless since it does not follow the rule of other targets are doing. That is a massive burden for libraries to maintain. Plus the file structures are overcomplicated to the point of useless.

I intend to modify the clang frontend to support the --sysroot= option, enabling it to locate this sysroot using path finding as demonstrated below.

llvm/llvm-project#96417

i686-windows-msvc

x86_64-windows-msvc

aarch64-windows-msvc

Windows + CRT Headers Include Directory: include.

With -stdlib=msstl, headers should be located in include/c++/msstl.

With -stdlib=libc++, headers should be located in include/c++/v1.

Libraries should be placed in lib/$TRIPLET.

For example. on x86_64-windows-msvc, it should find libs in lib/x86_64-unknown-windows-msvc.

// hello.cc
#include<iostream>

int main()
{
      std::cout<<"Hello World\n";
}

# Suppose the repository is cloned in $HOME on Linux
$ clang++ -o hello.exe hello.cc -O3 -fuse-ld=lld --target=x86_64-windows-msvc -I$HOME/windows-msvc-sysroot/include -I$HOME/windows-msvc-sysroot/include/c++/msstl -L$HOME/windows-msvc-sysroot/lib/x86_64-unknown-windows-msvc
$ wine ./hello.exe
Hello World

I would like to change clang to support the --sysroot= so that it would trivialize the cmake for cross compiling.

clang++ -o hello.exe hello.cc -O3 -fuse-ld=lld --target=x86_64-windows-msvc --sysroot=$HOME/windows-msvc-sysroot

Also it should support -stdlib=libc++.

clang++ -o hello.exe hello.cc -O3 -fuse-ld=lld --target=x86_64-windows-msvc --sysroot=$HOME/windows-msvc-sysroot -stdlib=libc++

This should equal to

# Suppose the repository is cloned in $HOME on Linux
$ clang++ -o hello.exe hello.cc -O3 -fuse-ld=lld --target=x86_64-windows-msvc -I$HOME/windows-msvc-sysroot/include -I$HOME/windows-msvc-sysroot/include/c++/v1 -L$HOME/windows-msvc-sysroot/lib/x86_64-unknown-windows-msvc
$ wine ./hello.exe
Hello World

https://github.com/trcrsired/llvm-releases/releases