simon-git: msvc-extract (main): Simon Tatham

[Commits to Tartarus hosted VCS]

TL;DR:
  102ed00 Initial support for cross-building Rust programs.

Repository:     https://git.tartarus.org/simon/msvc-extract.git
On the web:     https://git.tartarus.org/?p=simon/msvc-extract.git
Branch updated: main
Committer:      Simon Tatham <anakin at pobox.com>
Date:           2024-01-11 09:05:33

commit 102ed006e83a3ddba11668bb72dbaeed0dc10c72
web diff https://git.tartarus.org/?p=simon/msvc-extract.git;a=commitdiff;h=102ed006e83a3ddba11668bb72dbaeed0dc10c72;hp=f8fa676e4dc480e2711d2ea5543aea4ac3209b86
Author: Simon Tatham <anakin at pobox.com>
Date:   Thu Jan 11 08:46:54 2024 +0000

    Initial support for cross-building Rust programs.
    
    Rust's cross-compilation system _almost_ works out of the box for
    building on Linux for Windows. But it fails at the link step, where it
    expects to be able to invoke 'link.exe' and have it behave like the
    MSVC linker.
    
    But that's easily fixed: make a script called link.exe which invokes
    lld with the same command line, having set up LIB to point at the
    libraries.
    
    This commit adds a 'rustbin' directory in the msvc-extract tarball,
    containing just that script. To run it, you need 'lld-link' on your
    path already.
    
    With this change, I've been able to get a successful cross-build of a
    Rust program using the following technique:
    
     - start from the official 'rust' Docker image
     - apt install lld
     - rustup target add x86_64-pc-windows-msvc
     - add the 'rustbin' directory from this tarball to PATH
     - cargo build --target=x86_64-pc-windows-msvc
    
    However, trying the same thing with aarch64-pc-windows-msvc _doesn't_
    work at present: I get a small number of errors of the form 'machine
    type x64 conflicts with arm64', citing object files in msvcrt.lib. So
    there may be a further bug in this tool which is causing it to find
    the wrong version of that library.
    
    But this is a start.

 msvc-extract.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)