Disable LTO.

librdkafka.spec

@@ -1,6 +1,6 @@
 Name:		librdkafka
 Version:	1.3.0
-Release:	2%{?dist}
+Release:	3%{?dist}
 Summary:	The Apache Kafka C library
 
 License:	BSD
@@ -35,6 +35,12 @@ using librdkafka.
 %setup -q
 
 %build
+# configure tests try to compile code containing ASMs to a .o file
+# In an LTO world, that always works as compilation does not happen until
+# link time.  As a result we get the wrong results from configure.
+# Disable LTO.
+%define _lto_cflags %{nil}
+
 %configure --enable-lz4 \
            --enable-ssl \
            --enable-sasl
@@ -68,6 +74,9 @@ find %{buildroot} -name '*.a' -delete -print
 
 
 %changelog
+* Tue Jun 30 2020 Jeff Law <law@redhat.com> - 1.3.0-3
+Disable LTO
+
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.3.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild