* lib/g++.exp: Support testing already-installed GCC.

From-SVN: r36063

gcc/testsuite/ChangeLog

+2000-08-30  Alexandre Oliva  <aoliva@redhat.com>
+
+	* lib/g++.exp: Support testing already-installed GCC.
+
 2000-08-29  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* wtr-label-1.c, wtr-suffix-1.c: New tests.

gcc/testsuite/lib/g++.exp

@@ -88,7 +88,10 @@ proc g++_include_flags { args } {
     } else {
       set odir_v3 [lookfor_file ${gccpath} libstdc++-v3]
       set sdir_v3 [lookfor_file ${srcdir} libstdc++-v3]
-      append flags [exec ${odir_v3}/mkcheck 2 ${odir_v3} ${sdir_v3}]
+      if { ${odir_v3} != "" } {
+        append flags [exec ${odir_v3}/mkcheck 2 ${odir_v3} ${sdir_v3}]
+      }
+      # else we're probably testing an already-installed GCC.
     }
 
     return "$flags"