WIP: windows support

[Sahnvour]

Tried to run the bootstrap script from windows with msvc as initial compiler.

I got it running until trying to build LLVM with Zig, at the moment for x86_64-windows-gnu.

C:\dev\Zig\bootstrap\out\build-zig-x86_64-windows-gnu>cmake -GNinja C:\dev\Zig\bootstrap\zig   -DCMAKE_C_COMPILER="C:/dev/Zig/bootstrap/out/host/bin/zig.exe"   -DCMAKE_CXX_COMPILER="C:/dev/Zig/bootstrap/out/host/bin/zig.exe"   -DCMAKE_INSTALL_PREFIX=C:\dev\Zig\bootstrap\out\zig-x86_64-windows-gnu   -DCMAKE_PREFIX_PATH=C:\dev\Zig\bootstrap\out\x86_64-windows-gnu   -DCMAKE_CROSSCOMPILING=True   -DCMAKE_BUILD_TYPE=Release   -DZIG_TARGET_TRIPLE=x86_64-windows-gnu   -DZIG_EXECUTABLE=
-- The C compiler identification is Clang 10.0.0
-- The CXX compiler identification is Clang 10.0.0
-- Check for working C compiler: C:/dev/Zig/bootstrap/out/host/bin/zig.exe
-- Check for working C compiler: C:/dev/Zig/bootstrap/out/host/bin/zig.exe -- broken
CMake Error at cmake/3.16.4/share/cmake-3.16/Modules/CMakeTestCCompiler.cmake:60 (message):
  The C compiler

    "C:/dev/Zig/bootstrap/out/host/bin/zig.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: C:/dev/Zig/bootstrap/out/build-zig-x86_64-windows-gnu/CMakeFiles/CMakeTmp

    Run Build Command(s):ninja.exe cmTC_ad170 && [1/2] Building C object CMakeFiles/cmTC_ad170.dir/testCCompiler.c.obj

    [2/2] Linking C executable cmTC_ad170.exe
    FAILED: cmTC_ad170.exe
    cmd.exe /C "cd . && C:\dev\Zig\bootstrap\out\host\bin\zig.exe cc -target x86_64-windows-gnu   CMakeFiles/cmTC_ad170.dir/testCCompiler.c.obj  -o cmTC_ad170.exe -Wl,--out-implib,libcmTC_ad170.dll.a -Wl,--major-image-version,0,--minor-image-version,0  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
    warning: unsupported linker arg: --out-implib
    warning: unsupported linker arg: libcmTC_ad170.dll.a
    warning: unsupported linker arg: --major-image-version
    warning: unsupported linker arg: 0
    warning: unsupported linker arg: --minor-image-version
    warning: unsupported linker arg: 0
    lld: error: could not open 'libuuid.a': no such file or directory

    ninja: build stopped: subcommand failed.

I think it should

[andrewrk]

I got this working on POSIX - I think if you update build.bat and carefully match all the changes to the posix shell script, it will work.