When using std::time_put to format a chrono value, we should imbue the
formatting locale into the stream. This ensures that when
std::time_put::do_put uses a ctype or __timepunct facet from the locale,
it gets the correct facets.
libstdc++-v3/ChangeLog:
* include/bits/chrono_io.h (__formatter_chrono::_M_locale_fmt):
Imbue locale into ostringstream.
---
This doesn't cause a problem with any existing formatters, but is needed
for the next patches in this series. I'll try to come up with a
standalone testcase that depends on this fix (involving a custom facet
derived from std::time_put which uses the locale in its do_put).
Tested x86_64-linux.
libstdc++-v3/include/bits/chrono_io.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/libstdc++-v3/include/bits/chrono_io.h
b/libstdc++-v3/include/bits/chrono_io.h
index c16b555df29..55ebd4ee061 100644
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -1697,6 +1697,7 @@ namespace __format
char __fmt, char __mod) const
{
basic_ostringstream<_CharT> __os;
+ __os.imbue(__loc);
const auto& __tp = use_facet<time_put<_CharT>>(__loc);
__tp.put(__os, __os, _S_space, &__tm, __fmt, __mod);
if (__os)
--
2.48.1
