Switch to gcc-toolset-13-gcc

Resolves: rbhz#2178794

clang.spec

@@ -47,7 +47,7 @@
 
 Name:		%pkg_name
 Version:	%{clang_version}%{?rc_ver:~rc%{rc_ver}}
-Release:	5%{?dist}
+Release:	6%{?dist}
 Summary:	A C language family front-end for LLVM
 
 License:	Apache-2.0 WITH LLVM-exception OR NCSA
@@ -100,15 +100,7 @@ Patch13:     0001-Driver-Give-devtoolset-path-precedence-over-Installe.patch
 Patch201:   0001-clang-tools-extra-Make-test-dependency-on-LLVMHello-.patch
 %endif
 
-# RHEL only: We build LLVM with clang, which now defaults to using the
-#   libstdc++ from gcc-toolset-12. Since we're linking some clang
-#   tools statically to some static libraries from LLVM, we
-#   need to use libstdc++12 as well. So, use gcc-toolset-12
-#   to compile clang.
-# TODO: Update to use gts_version.
-BuildRequires: gcc-toolset-12-gcc-c++
-BuildRequires: gcc-toolset-12-annobin-plugin-gcc
-BuildRequires: gcc-toolset-12-libatomic-devel
+# Required to handle LTO debuginfo.
 BuildRequires: gcc-toolset-%{gts_version}-gdb
 BuildRequires:	clang
 BuildRequires:	cmake
@@ -199,7 +191,7 @@ libomp-devel to enable -fopenmp.
 %package libs
 Summary: Runtime library for clang
 Requires: %{name}-resource-filesystem%{?_isa} = %{version}
-Requires: gcc-toolset-12-gcc-c++
+Requires: gcc-toolset-%{gts_version}-gcc-c++
 Recommends: compiler-rt%{?_isa} = %{version}
 # atomic support is not part of compiler-rt
 Recommends: libatomic%{?_isa}
@@ -438,7 +430,7 @@ mv ../cmake-%{compat_ver}.src ../cmake
 	-DCLANG_DEFAULT_LINKER=lld \
 %endif
 	-DCLANG_DEFAULT_UNWINDLIB=libgcc \
-	-DGCC_INSTALL_PREFIX=/opt/rh/gcc-toolset-12/root/usr \
+	-DGCC_INSTALL_PREFIX=/opt/rh/gcc-toolset-%{gts_version}/root/usr \
 	-DLLVM_INCLUDE_BENCHMARKS=OFF
 
 %cmake_build
@@ -694,6 +686,9 @@ mv ./libclang-cpp.so.%{compat_maj_ver} "$compat_lib"
 
 %endif
 %changelog
+* Fri Jun 30 2023 Nikita Popov <npopov@redhat.com> - 16.0.1-6
+- Switch to gcc-toolset-13-gcc
+
 * Thu Jun 29 2023 Nikita Popov <npopov@redhat.com> - 16.0.1-5
 - Use gcc-toolset-13-gdb for gdb-add-index