[Bug 764523] New: -lole32 is missing for libgstdirectsoundsrc

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764523

            Bug ID: 764523
           Summary: -lole32 is missing for libgstdirectsoundsrc
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: kou at cozmixng.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 325255
  --> https://bugzilla.gnome.org/attachment.cgi?id=325255&action=edit
Fix the problem

https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/commit/?id=f9464ce3549c2b3948a582464631ba4f8dd0d5e7
uses CLSIDFromString().
To use CLSIDFromString(), we need to link against ole32.dll: See "DLL" in
https://msdn.microsoft.com/en-us/library/windows/desktop/ms680589%28v=vs.85%29.aspx

But the commit doesn't add "-lole32" to linker flags. It causes link error.

I'm sorry but I didn't record the error. Here are steps to reproduce the same
error:

1. Create a test program that uses CLSIDFromString:

#include <windows.h>

int
main(void)
{
  LPCOLESTR string = NULL;
  CLSID id;
  CLSIDFromString(string, &id);
  return 0;
}

2. Build with MinGW:

% x86_64-w64-mingw32-gcc a.c
/tmp/ccj5AFMG.o:a.c:(.text+0x23): undefined reference to
`__imp_CLSIDFromString'
collect2: error: ld returned 1 exit status
%

3. Add -lole32 flag

% x86_64-w64-mingw32-gcc a.c -lole32
%
(no error)

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