binutils: Allow gold to be statically linked

gold uses g++ to link which doesn't recognise -all-static. It appears as
if -static should work for both libtool and g++ but for some reason it
doesn't. Remove the restriction that gold can't be included in a static
toolchain. When a static toolchain is requested pass
--with-gold-ldflags=--static to configure. Finally build gold separately
so it does not get the extra_make_flags which may contain -all-static.

Signed-off-by: Chris Packham <judge.packham@gmail.com>

config/binutils/binutils.in

@@ -17,7 +17,6 @@ config BINUTILS_GOLD_SUPPORT
     bool
     default y
     depends on BINUTILS_GOLD_SUPPORTS_ARCH
-    depends on ! STATIC_TOOLCHAIN
 
 # Force using the BFD linker if needed. There are two options:
 # - For some C libraries (eg. glibc at least), BFD ld must be

scripts/build/binutils/binutils.sh

@@ -182,6 +182,16 @@ do_binutils_backend() {
         extra_config+=("--without-zstd")
     fi
 
+    # gold links with CXXLINK/g++, not libtool, and does not understand
+    # -all-static
+    if [ "${static_build}" = "y" ]; then
+        case "${CT_BINUTILS_LINKERS_LIST}" in
+            *gold*)
+                extra_config+=("--with-gold-ldflags=--static")
+                ;;
+        esac
+    fi
+
     CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
 
     CT_DoExecLog CFG                                            \
@@ -211,6 +221,13 @@ do_binutils_backend() {
     fi
 
     CT_DoLog EXTRA "Building binutils"
+    if [ "${static_build}" = "y" ]; then
+        case "${CT_BINUTILS_LINKERS_LIST}" in
+            *gold*)
+                CT_DoExecLog ALL make -C gold ${CT_JOBSFLAGS}
+                ;;
+        esac
+    fi
     CT_DoExecLog ALL make "${extra_make_flags[@]}" ${CT_JOBSFLAGS}
 
     CT_DoLog EXTRA "Installing binutils"