[PATCH] Different outputs affected by locale

[Yao Qi <yao at codesourcery dot com>]

We find the following fails in gdb test on mingw host.

FAIL: gdb.base/wchar.exp: print repeat
FAIL: gdb.base/wchar.exp: print repeat_p
FAIL: gdb.base/wchar.exp: print repeat (print null on)
FAIL: gdb.base/wchar.exp: print repeat (print elements 3)
FAIL: gdb.base/wchar.exp: print repeat_p (print elements 3)

print repeat^M
$7 = L"A", 'Â' <repeats 21 times>, "B", '\000' <repeats 104 times>^M
(gdb) FAIL: gdb.base/wchar.exp: print repeat

the \242 is expected in the test but cent sign is displayed.

In valprint.c:print_wchar, wchar_printable is called to determine
whether a wchar is printable.  wchar_printable calls iswprint but
the iswprint's return value depends on LC_CTYPE setting of locale [1, 2].
The output may vary with different locale settings.  I noticed that
gdb.exp:gdb_init set LC_CTYPE to C.  If I remove that line, tests
fail on native testing too.

IMO, either \242 or 'Â' (cent sign) is a correct output, which is
affect by locale, and it is not related to gdb at all.

[1] http://pubs.opengroup.org/onlinepubs/009604499/functions/iswprint.html
[2] msdn.microsoft.com/en-us/library/ewx8s4kw.aspx

This patch is to add code to 'p repeat[1]' to extract the cent first,
and then use it to match in the following tests.

gdb/testsuite:

2014-05-27  Yao Qi  <yao@codesourcery.com>

	* gdb.base/wchar.exp: Execute command 'p repeat[1]' and extract
	cent from the output.
---
 gdb/testsuite/gdb.base/wchar.exp | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/wchar.exp b/gdb/testsuite/gdb.base/wchar.exp
index 4290478..215d2f4 100644
--- a/gdb/testsuite/gdb.base/wchar.exp
+++ b/gdb/testsuite/gdb.base/wchar.exp
@@ -36,7 +36,23 @@ gdb_test "print simple\[2\]" "= 99 L'c'"
 
 gdb_test "print difficile\[2\]" "= 65261 L'\\\\xfeed'"
 
-set cent "\\\\242"
+# The contents in 'repeat' are shown differently under different
+# locale.  In stead of hard code the cent sign in variable 'cent',
+# extract it from the output of 'print repeat[1]', and use it to
+# match the output in the following tests.
+set cent ""
+set test "get cent"
+gdb_test_multiple "p repeat\[1\]" $test {
+    -re " = 162 L'(.*)'.*\r\n$gdb_prompt $" {
+	set cent [string_to_regexp $expect_out(1,string)]
+	pass $test
+    }
+    -re ".*$gdb_prompt $" {
+	fail $test
+	return
+    }
+}
+
 gdb_test "print repeat" "= L\"A\", '$cent' <repeats 21 times>, \"B.*"
 
 global hex
-- 
1.9.0