[bug#48525] [PATCH core-updates] gnu: rust: Add profiling support.

[Marius Bakke <marius@gnu.org>]

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Milkey Mouse <milkeymouse@meme.institute> skriver:

> * gnu/packages/rust.scm (rust-1.49)[source]: Add patch.
> [phases]{unpack-profiler-rt, enable-profiling}: New phases.
> [native-inputs]{compiler-rt-source}: New input.
> (rust-1.50)[source]: Remove "rust-1.49-llvm-cov-no-debug.patch".
> * gnu/packages/patches/rust-1.49-llvm-cov-no-debug.patch: New file.
> * gnu/local.mk (dist_patch_DATA): Add patch.

[...]

> diff --git a/gnu/packages/patches/rust-1.49-llvm-cov-no-debug.patch b/gnu/packages/patches/rust-1.49-llvm-cov-no-debug.patch
> new file mode 100644
> index 0000000000..b72402a9a7
> --- /dev/null
> +++ b/gnu/packages/patches/rust-1.49-llvm-cov-no-debug.patch
> @@ -0,0 +1,27 @@
> +cherry-picked from commit fe56d267cae, in master as of 1.50

Instead of backporting this patch to 1.49, I think it would be better to
switch the default Rust to the latest version before enabling profiling
support.

Unfortunately 1.50 currently fails to build on core-updates, so we'll
need a volunteer to fix that.  Would you like to give it a try?  :-)

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