Bootstrap on riscv64

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

libcxxabi.spec

@@ -1,4 +1,6 @@
+%ifnarch riscv64
 %global toolchain clang
+%endif
 %global libcxxabi_version 15.0.0
 #global rc_ver 3
 %global libcxxabi_srcdir libcxxabi-%{libcxxabi_version}%{?rc_ver:rc%{rc_ver}}.src
@@ -6,7 +8,7 @@
 
 Name:		libcxxabi
 Version:	%{libcxxabi_version}%{?rc_ver:~rc%{rc_ver}}
-Release:	2%{?dist}
+Release:	2.0.riscv64%{?dist}
 Summary:	Low level support for a standard C++ library
 License:	MIT or NCSA
 URL:		http://libcxxabi.llvm.org/
@@ -56,6 +58,10 @@ Summary:	Static libraries for libcxxabi
 sed -i 's|#define _LIBCXXABI_ARM_EHABI||g' include/__cxxabi_config.h
 %endif
 
+%ifarch riscv64
+%global _lto_cflags %{nil}
+%endif
+
 %ifarch s390 s390x
 %if 0%{?fedora} < 26
 # clang requires z10 at minimum
@@ -95,6 +101,9 @@ sed -i 's|#define _LIBCXXABI_ARM_EHABI||g' include/__cxxabi_config.h
 %{_libdir}/libc++abi.a
 
 %changelog
+* Fri Oct 07 2022 David Abdurachmanov <davidlt@rivosinc.com> - 15.0.0-2.0.riscv64
+- Bootstrap on riscv64
+
 * Mon Sep 12 2022 Nikita Popov <npopov@redhat.com> - 15.0.0-2
 - Don't pass explicit CMAKE_CXX_FLAGS