I've installed ldc2 for linux and am now trying to compile for windows. I downloaded the windows release as well and put the libs into the libs folder of the linux version. I'm currently trying to compile a simple test application:

import std.stdio;

void main() {
	writeln("Hello, World!");
}

with the following compiler arguments:
ldc2 hello.d --mtriple x86_64-windows-msvc
but I get a linker error (with -c it compiles just fine, but I need to produce an executable so that won't work.)
Here's the output the compiler gives me:

lld-link: error: <root>: undefined symbol: wmainCRTStartup
lld-link: error: undefined symbol: _D3std5stdio13trustedStdoutFNdNeZSQBgQBf4File
>>> referenced by hello.obj:(_D3std5stdio__T7writelnTAyaZQnFNfQjZv)

lld-link: error: undefined symbol: _D3std5stdio4File17lockingTextWriterMFNfZSQBoQBnQBk17LockingTextWriter
>>> referenced by hello.obj:(_D3std5stdio__T7writelnTAyaZQnFNfQjZv)

lld-link: error: undefined symbol: _D3std5stdio4File6__dtorMFNfZv
>>> referenced by hello.obj:(_D3std5stdio__T7writelnTAyaZQnFNfQjZv)
>>> referenced by hello.obj:(?dtor$7@?0?_D3std5stdio__T7writelnTAyaZQnFNfQjZv@4HA)

lld-link: error: undefined symbol: _D3std5stdio4File17LockingTextWriter10__aggrDtorMFNeZv
>>> referenced by hello.obj:(_D3std5stdio__T7writelnTAyaZQnFNfQjZv)
>>> referenced by hello.obj:(?dtor$4@?0?_D3std5stdio__T7writelnTAyaZQnFNfQjZv@4HA)

lld-link: error: undefined symbol: __CxxFrameHandler3
>>> referenced by hello.obj:(.xdata)

lld-link: error: undefined symbol: _d_enter_cleanup
>>> referenced by hello.obj:(?dtor$4@?0?_D3std5stdio__T7writelnTAyaZQnFNfQjZv@4HA)
>>> referenced by hello.obj:(?dtor$7@?0?_D3std5stdio__T7writelnTAyaZQnFNfQjZv@4HA)

lld-link: error: undefined symbol: _d_leave_cleanup
>>> referenced by hello.obj:(?dtor$4@?0?_D3std5stdio__T7writelnTAyaZQnFNfQjZv@4HA)
>>> referenced by hello.obj:(?dtor$7@?0?_D3std5stdio__T7writelnTAyaZQnFNfQjZv@4HA)

lld-link: error: undefined symbol: _d_wrun_main
>>> referenced by hello.obj:(wmain)

lld-link: error: undefined symbol: _D3std5stdio4File17LockingTextWriter26highSurrogateShouldBeEmptyMFNfZv
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTyaZQiMFNfyaZv)

lld-link: error: undefined symbol: _D3std5stdio4File17LockingTextWriter7handle_MFNdNeZPS4core4stdcQCf6_iobuf
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced 3 more times

lld-link: error: undefined symbol: _fputc_nolock
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTyaZQiMFNfyaZv)

lld-link: error: undefined symbol: _fputwc_nolock
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTyaZQiMFNfyaZv)
>>> referenced 1 more times

lld-link: error: undefined symbol: _d_arraybounds_index
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTyaZQiMFNfyaZv)
>>> referenced 8 more times

lld-link: error: undefined symbol: _d_arraybounds_slice
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTaZQhMFNfaZv)
>>> referenced by hello.obj:(_D3std5stdio4File17LockingTextWriter__T3putTyaZQiMFNfyaZv)
>>> referenced by hello.obj:(_D3std3utf__T11decodeFrontVEQBa8typecons__T4FlagVAyaa19_7573655265706c6163656d656e744463686172ZQCai0TAaZQDnFNaNeMKQnJmZw)
>>> referenced 2 more times

lld-link: error: undefined symbol: fwrite
>>> referenced by hello.obj:(_D3std5stdio__T13trustedFwriteTaZQsFNbNiNePOS4core4stdcQBx6_iobufxAaZm)

lld-link: error: undefined symbol: ClassInfo for std.exception.ErrnoException
>>> referenced by hello.obj:(_D3std9exception__T7bailOutHTCQBcQBb14ErrnoExceptionZQBiFNfAyamMAxaZNn)

lld-link: error: undefined symbol: _d_allocclass
>>> referenced by hello.obj:(_D3std9exception__T7bailOutHTCQBcQBb14ErrnoExceptionZQBiFNfAyamMAxaZNn)
>>> referenced by hello.obj:(_D3std3utf__T10decodeImplVbi1VEQBd8typecons__T4FlagVAyaa19_7573655265706c6163656d656e744463686172ZQCai0TAxaZQDrFQiKmZ__T9exceptionTQBbZQpFNaNbNfQBoQDrZCQFuQFt12UTFException)
>>> referenced by hello.obj:(_D3std3utf__T13_utfExceptionVEQBc8typecons__T4FlagVAyaa19_7573655265706c6163656d656e744463686172ZQCai0ZQDmFNaNfQCiwZw)

lld-link: error: undefined symbol: vtable for std.exception.ErrnoException
>>> referenced by hello.obj:(_D3std9exception__T7bailOutHTCQBcQBb14ErrnoExceptionZQBiFNfAyamMAxaZNn)

lld-link: error: undefined symbol: initializer for std.exception.ErrnoException
>>> referenced by hello.obj:(_D3std9exception__T7bailOutHTCQBcQBb14ErrnoExceptionZQBiFNfAyamMAxaZNn)

lld-link: error: too many errors emitted, stopping now (use /errorlimit:0 to see all errors)
Error: linking with LLD failed

If i remember correctly, you need to make sure you have

"x86_64-.*-windows-msvc":
{
    switches = [
        "-defaultlib=phobos2-ldc,druntime-ldc",
    ];
    lib-dirs = [
        "%%ldcbinarypath%%/../lib-win64",
    ];
};

in $LDC_PATH/etc/ldc2.conf

Here is how dscanner is doing it: https://github.com/dlang-community/D-Scanner/blob/master/setup-ldc-windows.sh

I wonder why they need to do all of that, it should work out of the box.. that's weird

I don't have ability to test it, but try this How-To:

• download LDC for Linux
• download LDC for Windows (multilib)
• extract LDC for Linux somewhere - it will be $LDC_PATH
• add to $PATH : $LDC_PATH/bin
• extract LDC for Windows and move folders lib32 and lib64 to <LDC_PATH>/win-lib32 and <LDC_PATH>/win_lib64
• add rows below to the $LDC_PATH/etc/ldc2.conf:

  "i[3-6]86-.*-windows-msvc":
  {
      switches = [
          "-defaultlib=phobos2-ldc,druntime-ldc",
          "-link-defaultlib-shared=false",
      ];
      lib-dirs = [
          "%%ldcbinarypath%%/../win-lib32",
      ];
  };

  "x86_64-.*-windows-msvc":
  {
      switches = [
          "-defaultlib=phobos2-ldc,druntime-ldc",
          "-link-defaultlib-shared=false",
      ];
      lib-dirs = [
          "%%ldcbinarypath%%/../win-lib64",
      ];
  };

• to build use
  dub build --arch=x86_64-pc-windows-msvc

On Saturday, 14 January 2023 at 20:24:06 UTC, ryuukk_ wrote:

"x86_64-.*-windows-msvc":
{
    switches = [
        "-defaultlib=phobos2-ldc,druntime-ldc",
    ];
    lib-dirs = [
        "%%ldcbinarypath%%/../lib-win64",
    ];
};

I've added that and I still get the same errors.

On Saturday, 14 January 2023 at 22:16:35 UTC, Sergey wrote:

  "i[3-6]86-.*-windows-msvc":
  {
      switches = [
          "-defaultlib=phobos2-ldc,druntime-ldc",
          "-link-defaultlib-shared=false",
      ];
      lib-dirs = [
          "%%ldcbinarypath%%/../win-lib32",
      ];
  };

[...]

this worked (or at least the executable runs under wine)! thanks

actually, nevermind. I tried to compile something more substantial (my terminal game, qonquest) as a test and I got the following errors:

lld-link: error: undefined symbol: _D3std4file8DirEntry4nameMxFNaNbNdNjNlNfZAya
>>> referenced by /home/z/code/d/qonquest/source/script.d:236
>>>               .dub/build/application-debug-windows-x86_64-ldc_v1.30.0-git-501c657-B35CDD9344888E5E741CE71FFBE20530/qonquest.obj:(_D6script11loadScriptsFAyaPS4arsd8terminal8TerminalZv)
>>> referenced by /home/z/code/d/qonquest/source/saveload.d:82
>>>               .dub/build/application-debug-windows-x86_64-ldc_v1.30.0-git-501c657-B35CDD9344888E5E741CE71FFBE20530/qonquest.obj:(_D8saveload8saveListFZAya)
>>> referenced by /home/z/.dub/packages/arsd-official-10.9.8/arsd-official/terminal.d:7391
>>>               arsd-official_terminal.lib(arsd.terminal.obj):(_D4arsd8terminal14FileLineGetter11tabCompleteMFIAwIQdZAAya)

lld-link: error: undefined symbol: _D6object9Throwable4nextMNgFNaNbNdNiNjNlNfZNgCQBsQBo
>>> referenced by .dub/build/application-debug-windows-x86_64-ldc_v1.30.0-git-501c657-B35CDD9344888E5E741CE71FFBE20530/qonquest.obj:(vtable for script.ScriptException)
>>> referenced by .dub/build/application-debug-windows-x86_64-ldc_v1.30.0-git-501c657-B35CDD9344888E5E741CE71FFBE20530/qonquest.obj:(vtable for app.CommandException)
>>> referenced by arsd-official_terminal.lib(arsd.terminal.obj):(vtable for arsd.terminal.UserInterruptionException)
>>> referenced 1 more times

which both appear to be phobos/druntime things

On Saturday, 14 January 2023 at 22:54:13 UTC, TheZipCreator wrote:

Not sure if that's the problem, but as mentioned on https://wiki.dlang.org/Cross-compiling_with_LDC, it is absolutely crucial that the Windows libs are copied from a Windows package of the same version as your host LDC (so that the bundled importable .d files match the prebuilt libs). You seem to be using a CI build (…-git-501c657), so the Windows package needs to be from the same CI build.

On Sunday, 15 January 2023 at 11:21:46 UTC, kinke wrote:

This did appear to be the issue. I reinstalled ldc2 from the same release as where I got the windows libs and now it works perfectly.