[ https://issues.apache.org/jira/browse/STDCXX-2?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567802#action_12567802 ] 

Martin Sebor commented on STDCXX-2:
-----------------------------------

Btw., I note {{__rw_fix_flt}} uses the {{_WIN32}} macro to enable another workaround for a bug (or "feature," if you work for Microsoft) in the MSVC CRT, while the workaround in your patch is guarded with {{_MSC_VER}}. Even though the latter is arguably ore appropriate, I suspect they are both subtly wrong: the former will apply the workaround for gcc on Cygwin (which, presumably, doesn't need it because it uses its own C library), while the latter will (likely) fail to MinGW which I believe does sit on top of the Microsoft libc.

> [MSVC] std::num_put bad formatting of 0.0 with precision and showpoint
> ----------------------------------------------------------------------
>
>                 Key: STDCXX-2
>                 URL: https://issues.apache.org/jira/browse/STDCXX-2
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
>         Environment: Windows/MSVC
>            Reporter: Martin Sebor
>            Assignee: Farid Zaripov
>             Fix For: 4.2.1
>
>         Attachments: 22.locale.num.put.stdcxx-2.cpp, num_put.cpp.diff
>
>   Original Estimate: 4h
>          Time Spent: 2.5h
>  Remaining Estimate: 1.5h
>
> When compiled with MSVC (any version), the program below aborts at runtime.
> $ cat t.cpp && cl  -D_RWCONFIG=11s_msvc_7_1 -Ic:/contrib/cygwin/build/sebor/dev-hal/include -I./../../../../include -Ic:/contrib/cygwin/build/sebor/dev-hal/examples/stdlib/manual/../include  -Ic:/contrib/cygwin/build/sebor/dev-hal/include/ansi -I./../../../..
> -Ic:/contrib/cygwin/build/sebor/dev-hal -Ic:/contrib/cygwin/build/sebor/dev-hal/examples/stdlib/manual -I. -nologo -GX -MLd -W3 -Zi -GA -GR -GF -GZ  -c t.cpp && link  -nologo /NODEFAULTLIB:libcpd /debug /LIBPATH:./../../../../lib /OUT:t.exe t.obj  std11s_msvc_7_1.lib user32.lib t.cpp && ./t.exe
> #include <cassert>
> #include <sstream>
> int main ()
> {
>     std::ostringstream strm;
>     strm.setf (strm.showpoint);
>     strm.precision (2);
>     strm << 0.0;
>     assert ("0.0" == strm.str ());
> }
> Assertion failed: "0.0" == strm.str (), file t.cpp, line 13

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