diff --git a/macros b/macros
index 9f2067b..01f35dc 100644
--- a/macros
+++ b/macros
@@ -328,7 +328,9 @@ print(result)
 # to verify they have real sections/symbols after LTO stripping.  That
 # way we can detect installing an unusable .o/.a file.  This is on the TODO
 # list for F34.
-%_lto_cflags             -flto -ffat-lto-objects
+%_gcc_lto_cflags	-flto -ffat-lto-objects
+%_clang_lto_cflags	-flto
+%_lto_cflags		%{expand:%%{_%{toolchain}_lto_cflags}}
 
 %_general_options       -O2 %{?_lto_cflags} -fexceptions -g -grecord-gcc-switches -pipe
 %_warning_options       -Wall -Werror=format-security
diff --git a/redhat-rpm-config.spec b/redhat-rpm-config.spec
index 4d0e760..328b41e 100644
--- a/redhat-rpm-config.spec
+++ b/redhat-rpm-config.spec
@@ -6,7 +6,7 @@
 
 Summary: Red Hat specific rpm configuration files
 Name: redhat-rpm-config
-Version: 164
+Version: 165
 Release: 1%{?dist}
 # No version specified.
 License: GPL+
@@ -211,6 +211,9 @@ install -p -m 644 -t %{buildroot}%{_rpmluadir}/fedora/srpm forge.lua
 %{_rpmconfigdir}/macros.d/macros.kmp
 
 %changelog
+* Tue Jul 28 2020 Tom Stellard <tstellar@redhat.com> - 165-1
+- Only use supported lto flags for clang toolchain
+
 * Thu Jul 23 2020 Lumír Balhar <lbalhar@redhat.com> - 164-1
 - Disable Python hash seed randomization in brp-python-bytecompile