Linking to libcurl suppresses output in emacs shell on windows

Hello List!

I am taking the liberty of cross-posting this message I had
sent to the libcurl list.

This behavior didn't ring any bells with the libcurl guys.
According to them:

   libcurl certainly doesn't do anything magic, as if you're using
   its default actions it simply sends the data to stdout.

Not urgent, but any help resolving this would be appreciated.


---------- Forwarded message ----------
From: K. Frank <>
Date: Sat, Oct 26, 2013 at 10:27 PM
Subject: Linking to libcurl suppresses output in emacs shell on windows
To: libcurl development <>

Hello List!

I have a simple c++ program that I build with g++ 4.8.1 from
mingw-w64 on 64-bit windows.  This program writes to cout.

When I run it in an emacs (version 23.1.1) shell (i.e., M-x shell)
the output shows up.  If I then non-trivially link the program
with libcurl (non-trivial in the sense that the program is modified
to actually use libcurl -- simply adding "-lcurldll' to the link
command for a program that doesn't actually reference anything
in libcurl doesn't have this effect), the output from the program
no longer shows up in the emacs shell.

This is with libcurl 64-bit 7.31.0, built (I believe) with mingw-w64.

If I run the program from a windows command prompt, the
output shows up normally.

Does anyone know what might be going on, and how I might fix
it?  This is not a show-stopper for me, but it is vaguely annoying,
and also somewhat puzzling.


Thanks for any advice.


K. Frank