Active GCC plugin during LTO linking

See the downstream bug for details:

  https://bugzilla.redhat.com/show_bug.cgi?id=1983727

macros

@@ -89,7 +89,7 @@
 # When clang is used as a linker driver, it does not auto-detect the LTO
 # bytecode and neither does bfd, so we need to explicitly pass the -flto
 # flag when linking.
-%build_ldflags -Wl,-z,relro %{_ld_as_needed_flags} %{_ld_symbols_flags} %{_hardened_ldflags} %[ "%{toolchain}" == "clang" ? "%{?_lto_cflags}" : "" ]
+%build_ldflags -Wl,-z,relro %{_ld_as_needed_flags} %{_ld_symbols_flags} %{_hardened_ldflags} %{_annotation_ldflags} %[ "%{toolchain}" == "clang" ? "%{?_lto_cflags}" : "" ]
 
 # Expands to shell code to set the compiler/linker environment
 # variables CFLAGS, CXXFLAGS, FFLAGS, FCFLAGS, LDFLAGS if they have
@@ -317,7 +317,7 @@ print(result)
 %_annobin_clang_plugin	%dnl-fplugin=/usr/lib64/clang/`clang -dumpversion`/lib/annobin.so
 %_annotation_plugin     %{?_annotated_build:%{expand:%%{_annobin_%{toolchain}_plugin}}}
 %_annotation_cflags     %[ "%{_target_cpu}" == "armv7hl" ? "" : "%{_annotation_plugin}" ]
-
+%_annotation_ldflags	%{?_lto_cflags:%{_annotation_cflags}}
 
 # Fail linking if there are undefined symbols.  Required for proper
 # ELF symbol versioning support.  Disabled by default.

redhat-rpm-config.spec

@@ -6,7 +6,7 @@
 
 Summary: Red Hat specific rpm configuration files
 Name: redhat-rpm-config
-Version: 193
+Version: 194
 Release: 1%{?dist}
 # No version specified.
 License: GPL+
@@ -215,6 +215,9 @@ install -p -m 644 -t %{buildroot}%{_rpmluadir}/fedora/srpm forge.lua
 %{_rpmconfigdir}/macros.d/macros.kmp
 
 %changelog
+* Mon Aug  2 2021 Florian Weimer <fweimer@redhat.com> - 194-1
+- Active GCC plugin during LTO linking
+
 * Sat Jul 24 2021 Michel Alexandre Salim <salimma@fedoraproject.org> - 193-1
 - Add macros.build-constraints
 - Keep the misc macros in alphabetical order