!15 [sync] PR-14: 默认禁止LTO优化

From: @openeuler-sync-bot 
Reviewed-by: @cf-zhao 
Signed-off-by: @cf-zhao

llvm.spec

@@ -24,9 +24,12 @@
 %global build_install_prefix %{buildroot}%{install_prefix}
 %global llvm_triple %{_host}
 
+# Disable LTO as this causes crash if gcc lto enabled.
+%define _lto_cflags %{nil}
+
 Name:		%{pkg_name}
 Version:	%{maj_ver}.%{min_ver}.%{patch_ver}
-Release:	1
+Release:	2
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -318,6 +321,9 @@ fi
 %{_libdir}/%{name}/lib/libLLVMTestingSupport.a
 
 %changelog
+* Wed Jun 7 2023 Chenxi Mao <chenxi.mao@suse.com> - 15.0.7-2
+- Disable LTO as this causes crash if gcc lto enabled.
+
 * Mon Feb 20 2023 Chenxi Mao <chenxi.mao@suse.com> - 15.0.7-1
 - Upgrade to 15.0.7.