Accepting request 886366 from home:aaronpuchert:llvm-next

- Add support-llvm12.patch to support building with LLVM 12.

OBS-URL: https://build.opensuse.org/request/show/886366
OBS-URL: https://build.opensuse.org/package/show/devel:languages:rust/rust?expand=0&rev=286

rust.spec

@@ -156,6 +156,9 @@ Source209:      %{dl_url}/rust-%{version_bootstrap}-riscv64gc-unknown-linux-gnu.
 Source1000:     README.suse-maint
 # PATCH-FIX-OPENSUSE: edit src/librustc_llvm/build.rs to ignore GCC incompatible flag
 Patch0:         ignore-Wstring-conversion.patch
+# PATCH-FIX-UPSTREAM: https://github.com/rust-lang/rust/pull/81451, trivially rebased before
+# https://github.com/rust-lang/rust/pull/82045 and https://github.com/rust-lang/rust/pull/82102.
+Patch1:         support-llvm12.patch
 BuildRequires:  ccache
 BuildRequires:  curl
 BuildRequires:  fdupes
@@ -413,6 +416,7 @@ This package includes HTML documentation for Cargo.
 %setup -q -n rustc-%{version}-src
 
 %patch0 -p1
+%patch1 -p1
 
 # use python3
 sed -i -e "1s|#!.*|#!%{_bindir}/python3|" x.py