[patch, testsuite] check for UTF-32 target wide charset support in gdb.base/wchar.exp

[Sandra Loosemore <sandra@codesourcery.com>]

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This patch is related to the one I posted yesterday to make 
with_target_charset do something reasonable in the absence of ICONV support:

https://sourceware.org/ml/gdb-patches/2015-09/msg00357.html

If GDB is configured without ICONV support, the target wide charset 
defaults to "ISO-8859-1" (which isn't even a wide charset), and all the 
wide strings in this test print as gibberish.  Otherwise, GDB seems to 
think the default is "auto; currently UTF-32", so let's make the 
dependency on UTF-32 explicit here and bail out if it's not available.

OK to commit?

-Sandra


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2015-09-16  Sandra Loosemore  <sandra@codesourcery.com>

	gdb/testsuite/
	* gdb.base/wchar.exp: Require UTF-32 target wide charset support,
	otherwise skip this test.

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diff --git a/gdb/testsuite/gdb.base/wchar.exp b/gdb/testsuite/gdb.base/wchar.exp
index 1a5a2d4..171385b 100644
--- a/gdb/testsuite/gdb.base/wchar.exp
+++ b/gdb/testsuite/gdb.base/wchar.exp
@@ -24,6 +24,19 @@ if ![runto "wchar.c:$bp_location" ] then {
   return -1
 }
 
+# This test requires wide character support in GDB.
+# Setting the charset may fail if GDB was configured without
+# ICONV support.
+gdb_test_multiple "set target-wide-charset UTF-32" "" {
+    -re "Undefined item.*$gdb_prompt " {
+	unsupported "Unknown charset UTF-32"
+	return -1
+    }
+    -re ".*$gdb_prompt " {
+	pass "set target-wide-charset UTF-32"
+    }
+}
+
 gdb_test "print narrow" "= 97 L'a'"
 
 gdb_test "print single" "= 48879 L'\\\\xbeef'"