Allow LD testsuite to use in-tree g++

[Nick Clifton <nickc at redhat dot com>]

Hi Guys,

  Back in 2012 the gcc project changed the name of the in-tree built C++
  compiler from g++ to xg++:
  
https://gcc.gnu.org/ml/gcc-patches/2012-11/msg01349.html

  Unfortunately the linker testsuite's makefile still looks for an
  executable called g++ when computing CXX_FOR_TARGET.  So I am checking
  in the patch below to fix this.

  This may be a waste of time as I am not sure if a 'built but not
  installed G++ compiler' will actually be able to find the header files
  and libraries that it needs.  But if that turns out to be true then
  the CXX_FOR_TARGET macro needs to be properly rewritten.
  
Cheers
  Nick

ld/ChangeLog
2016-02-18  Nick Clifton  <nickc@redhat.com>

	* Makefile.am (CXX_FOR_TARGET): Check for the presence of an
	in-tree xg++ executable after checking for the presence of an
	in-tree g++ executable.
	* Makefile.in: Regenerate.

diff --git a/ld/Makefile.am b/ld/Makefile.am
index 8bfd318..818af5a 100644
--- a/ld/Makefile.am
+++ b/ld/Makefile.am
@@ -122,6 +122,12 @@ CXX_FOR_TARGET = ` \
     else \
       echo $$r/../gcc/g++ -B$$r/../gcc/; \
     fi; \
+  elif [ -f $$r/../gcc/xg++ ] ; then \
+    if [ -f $$r/../newlib/Makefile ] ; then \
+      echo $$r/../gcc/xg++ -B$$r/../gcc/ -idirafter $$r/../newlib/targ-include -idirafter $${srcroot}/../newlib/libc/include -nostdinc; \
+    else \
+      echo $$r/../gcc/xg++ -B$$r/../gcc/; \
+    fi; \
   else \
     if [ "@host@" = "@target@" ] ; then \
       echo $(CXX); \