Force -ffat-lto-objects and re-enable LTO

mpdecimal.spec

@@ -3,7 +3,7 @@
 
 Name:           mpdecimal
 Version:        2.5.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Library for general decimal arithmetic
 License:        BSD
 
@@ -50,11 +50,10 @@ The package contains documentation for the mpdecimal library.
 unzip -d tests/testdata %{SOURCE1}
 
 %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}
+# Force -ffat-lto-objects so that configure tests are assembled which
+# is required for ASM configure tests.  -ffat-lto-objects is the default
+# for F33, but will not be the default in F34
+#define _lto_cflags -flto=auto -ffat-lto-objects
 
 %configure
 make %{?_smp_mflags}
@@ -93,6 +92,9 @@ fi
 %ldconfig_scriptlets
 
 %changelog
+* Mon Aug 31 2020 Jeff Law <law@redhat.com> - 2.5.0-3
+- Force -ffat-lto-objects and re-enable LTO
+
 * Thu Aug  6 2020 Jaroslav Škarvada <jskarvad@redhat.com> - 2.5.0-2
 - Re-enabled tests