https://github.com/arsv/perl-cross/issues/148

LTO confuses the configure tests.
--- a/cnf/configure__f.sh
+++ b/cnf/configure__f.sh
@@ -276,7 +276,7 @@ try_compile() {
 	require 'cc'
 	require '_o'
 	try_dump
-	run $cc $ccflags "$@" -c -o try$_o try.c >> $cfglog 2>&1
+	run $cc $ccflags -fno-lto "$@" -c -o try$_o try.c >> $cfglog 2>&1
 }
 
 # an equivalent of try_compile with -Werror, but without