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Ryan Liptak a502301b5e zig rc: Add COFF object file creation for CMake cross-compilation use case 
In #22522 I said:

> RC="zig rc" will now work in combination with zig cc and CMake. Here's an example of cross-compiling a simple Windows GUI CMake project
>
>    $ RC="zig rc" CC="zig cc --target=x86_64-windows-gnu" cmake .. -DCMAKE_SYSTEM_NAME=Windows -G Ninja

However, I didn't realize that the time that this only works because of the `-G Ninja` part. When not using Ninja as the build tool, CMake adds a workaround for 'very long lists of object files' where it takes all object files and runs them through `ar` to combine them into one archive:

4a11fd8dde/Modules/Platform/Windows-GNU.cmake (L141-L158)

This is a problem for the Windows resource use-case, because `ar` doesn't know how to deal with `.res` files and so this object combining step fails with:

    unknown file type: foo.rc.res

Only the linker knows what to do with .res files (since it has its own `.res` -> `.obj` ('cvtres') conversion mechanism). So, when using Ninja, this object file combining step is skipped and the .res file gets passed to the linker and everyone is happy.

Note: When CMake thinks that its using `windres` as the Windows resource compiler, it will pass `-O coff` to windres which causes it to output a COFF object file instead of a `.res` file, which means that the `ar` step can succeed because it's only working on actual object files.

---

This commit gives `zig rc` the ability to output COFF object files directly when `/:output-format coff` is provided as an argument. This effectively matches what happens when CMake uses `windres` for resource compilation, but requires the argument to be provided explicitly.

So, after this change, the following CMake cross-compilation use case will work, even when not using Ninja as the generator:

    RC="zig rc /:output-format coff" CC="zig cc --target=x86_64-windows-gnu" cmake .. -DCMAKE_SYSTEM_NAME=Windows
2025-02-22 21:21:30 -05:00
..
ani.zig Lazily compile the zig rc subcommand and use it during zig build-exe 2024-03-11 05:06:16 -07:00
ast.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
bmp.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
cli.zig zig rc: Add COFF object file creation for CMake cross-compilation use case 2025-02-22 21:21:30 -05:00
code_pages.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
comments.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
compile.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
cvtres.zig zig rc: Add COFF object file creation for CMake cross-compilation use case 2025-02-22 21:21:30 -05:00
disjoint_code_page.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
errors.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
ico.zig std: update std.builtin.Type fields to follow naming conventions 2024-08-28 08:39:59 +01:00
lang.zig zig build fmt 2025-02-22 17:09:20 -08:00
lex.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
literals.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
main.zig zig rc: Add COFF object file creation for CMake cross-compilation use case 2025-02-22 21:21:30 -05:00
parse.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
preprocess.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
rc.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
res.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
source_mapping.zig resinator: Sync with upstream 2025-01-17 23:10:41 -08:00
utils.zig Integrate resinator errors with Zig using std.zig.Server and ErrorBundle 2024-03-11 05:06:16 -07:00
windows1252.zig Lazily compile the zig rc subcommand and use it during zig build-exe 2024-03-11 05:06:16 -07:00