Add support for riscv64

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

clang.spec

@@ -74,7 +74,7 @@
 
 Name:		%pkg_name
 Version:	%{clang_version}%{?rc_ver:~rc%{rc_ver}}%{?llvm_snapshot_version_suffix:~%{llvm_snapshot_version_suffix}}
-Release:	1%{?dist}
+Release:	1.0.riscv64%{?dist}
 Summary:	A C language family front-end for LLVM
 
 License:	Apache-2.0 WITH LLVM-exception OR NCSA
@@ -326,7 +326,7 @@ rm test/CodeGen/profile-filter.c
 %build
 
 # Disable lto on i686 due to memory constraints.
-%ifarch %ix86
+%ifarch %ix86 riscv64
 %define _lto_cflags %{nil}
 %endif
 
@@ -335,7 +335,7 @@ rm test/CodeGen/profile-filter.c
 %global _lto_cflags %nil
 %endif
 
-%ifarch s390 s390x aarch64 %ix86 ppc64le
+%ifarch s390 s390x aarch64 %ix86 ppc64le riscv64
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
 %endif
@@ -347,7 +347,7 @@ rm test/CodeGen/profile-filter.c
 %endif
 
 # Disable dwz on aarch64, because it takes a huge amount of time to decide not to optimize things.
-%ifarch aarch64
+%ifarch aarch64 riscv64
 %define _find_debuginfo_dwz_opts %{nil}
 %endif
 
@@ -363,7 +363,7 @@ rm test/CodeGen/profile-filter.c
 	-DCMAKE_BUILD_TYPE=RelWithDebInfo \
 	-DPYTHON_EXECUTABLE=%{__python3} \
 	-DCMAKE_SKIP_RPATH:BOOL=ON \
-%ifarch s390 s390x %ix86 ppc64le
+%ifarch s390 s390x %ix86 ppc64le riscv64
 	-DCMAKE_C_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 	-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 %endif
@@ -704,6 +704,9 @@ LD_LIBRARY_PATH=%{buildroot}/%{install_libdir} %{__ninja} check-all -C %{__cmake
 
 %endif
 %changelog
+* Wed Mar 27 2024 David Abdurachmanov <davidlt@rivosinc.com> - 18.1.1-1.0.riscv64
+- Add support for riscv64
+
 * Mon Mar 11 2024 Tom Stellrd <tstellar@redhat.com> - 18.1.1-1
 - 18.1.1 Release