binutils,gcc: Add support to control LTO and Gold.

source-builder/config/binutils-2-1.cfg

@@ -26,6 +26,16 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
 #
 %define allow_cxc
 
+#
+# Default gold and LTO to disable.
+#
+%ifn %{defined with_gold}
+ %define with_gold 0
+%endif
+%ifn %{defined with_lto}
+ %define with_lto 0
+%endif
+
 #
 # Source
 #
@@ -60,6 +70,8 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
     --target=%{_target} \
     --verbose --disable-nls \
     %{?with_deterministic_archives:--enable-deterministic-archives} \
+    %{?with_gold:--enable-gold=yes} \
+    %{?with_lto:--enable-lto --enable-plugins}%{!?with_lto:--disable-lto} \
     --without-included-gettext \
     --disable-win32-registry \
     --disable-werror \

source-builder/config/gcc-common-1.cfg

@@ -31,6 +31,13 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
 #
 %global _gcclibdir %{_prefix}/lib
 
+#
+# Default LTO to off.
+#
+%ifn %{defined with_lto}
+ %define with_lto 0
+%endif
+
 #
 # Prepare the source code.
 #
@@ -149,7 +156,7 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
     --disable-nls --without-included-gettext \
     --disable-win32-registry \
     --enable-version-specific-runtime-libs \
-    --disable-lto \
+    %{?with_lto:--enable-lto}%{!?with_lto:--disable-lto} \
     --enable-newlib-io-c99-formats \
     %{?with_iconv:--enable-newlib-iconv} \
     %{?with_iconv:--enable-newlib-iconv-encodings=%{_newlib_iconv_encodings}} \