Fix installed dlltool testing

[Joseph S. Myers]

This patch fixes testing dlltool in installed toolchain testing (runtest 
--tool binutils, having created an appropriate site.exp).  The code 
looking for gas in the build tree fails in that case, so options expecting 
such a copy of gas should not be passed to dlltool.

This changes

FAIL: dlltool -p (execution)

into

PASS: dlltool -p (execution)
PASS: dlltool -p (symbol names)
PASS: dlltool -p (import name)

testing a cross from i686-pc-linux-gnu to i686-mingw32 with installed 
testing, and the tests also pass in build-tree testing.  OK to commit?

2008-02-25  Joseph Myers  <joseph@codesourcery.com>

	* config/default.exp (gcc_gas_flag, dlltool_gas_flag): Define to
	empty for testing an installed toolchain.

Index: config/default.exp
===================================================================
RCS file: /cvs/src/src/binutils/testsuite/config/default.exp,v
retrieving revision 1.12
diff -u -r1.12 default.exp
--- config/default.exp	5 Jul 2007 16:54:45 -0000	1.12
+++ config/default.exp	25 Feb 2008 22:12:27 -0000
@@ -94,8 +94,14 @@
 } else {
     link_or_copy ld/ld-new ld[exe_ext]
 }
-set gcc_gas_flag "-B[pwd]/tmpdir/gas/"
-set dlltool_gas_flag "-S [pwd]/tmpdir/gas/as[exe_ext]"
+if {[file isfile tmpdir/gas/as[exe_ext]]} then {
+    set gcc_gas_flag "-B[pwd]/tmpdir/gas/"
+    set dlltool_gas_flag "-S [pwd]/tmpdir/gas/as[exe_ext]"
+} else {
+    # Testing an installed toolchain.
+    set gcc_gas_flag ""
+    set dlltool_gas_flag ""
+}
 
 #
 # binutils_run

-- 
Joseph S. Myers
joseph@codesourcery.com