[commit] Forward "c++" option to get_compiler_info.

[dje@google.com (Doug Evans)]

Hi.

While testing another fix I was running the test with

runtest CXX_FOR_TARGET=/foo/g++ bar.exp

This failed because the wrong compiler was being used by
get_compiler_info.
The test is a c++ test and get_compiler_info was invoking gcc instead
of the g++ I specified.

Committed.

2010-07-30  Doug Evans  <dje@google.com>

	* lib/gdb.exp (build_executable): Forward "c++" option to
	get_compiler_info.

Index: lib/gdb.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
retrieving revision 1.156
diff -u -p -r1.156 gdb.exp
--- lib/gdb.exp	29 Jul 2010 14:18:57 -0000	1.156
+++ lib/gdb.exp	30 Jul 2010 19:58:39 -0000
@@ -3257,7 +3257,11 @@ proc build_executable { testname executa
         return -1
     }
 
-    if [get_compiler_info ${binfile}] {
+    set info_options ""
+    if { [lsearch -exact $options "c++"] >= 0 } {
+	set info_options "c++"
+    }
+    if [get_compiler_info ${binfile} ${info_options}] {
         return -1
     }
     return 0