There is currently a bug with std::showpos with the older
version of libstdc++-v3 that is bundled with gcc 4.2.1
in-tree. It was exposed by the Gnash testsuite when
dates were not being formatted correctly showing
GMT00000 instead of GMT+0000 as expected.
2007-11-26 Paolo Carlini <pcarl...@suse.de>
* include/bits/locale_facets.tcc (num_put<>::_M_insert_int): When
ios_base::showpos and the type is signed and the value is zero,
prepend +.
Index: gnu/gcc/libstdc++-v3/include/bits/locale_facets.tcc
===================================================================
RCS file: /home/cvs/src/gnu/gcc/libstdc++-v3/include/bits/locale_facets.tcc,v
retrieving revision 1.1.1.1
diff -u -p -r1.1.1.1 locale_facets.tcc
--- gnu/gcc/libstdc++-v3/include/bits/locale_facets.tcc 15 Oct 2009 17:11:32
-0000 1.1.1.1
+++ gnu/gcc/libstdc++-v3/include/bits/locale_facets.tcc 6 Feb 2011 21:40:46
-0000
@@ -1015,13 +1015,13 @@ _GLIBCXX_BEGIN_LDBL_NAMESPACE
if (__builtin_expect(__dec, true))
{
// Decimal.
- if (__v > 0)
+ if (__v >= 0)
{
if (__flags & ios_base::showpos
&& numeric_limits<_ValueT>::is_signed)
*--__cs = __lit[__num_base::_S_oplus], ++__len;
}
- else if (__v)
+ else
*--__cs = __lit[__num_base::_S_ominus], ++__len;
}
else if (__flags & ios_base::showbase && __v)
--
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