[Bug 10401] New: cygwin programs don't sscanf() properly when -mno-cygwin is used in gcc options

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=10401

           Summary: cygwin programs don't sscanf() properly when -mno-cygwin
                    is used in gcc options
           Product: Wine
           Version: 0.9.49.
          Platform: PC-x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-misc
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: emwine at earthlink.net


Created an attachment (id=9089)
 --> (http://bugs.winehq.org/attachment.cgi?id=9089)
testcase project and 2 test binaries

When I upgraded to Winboard version 4.2.7b from 4.2.7a, I got parse errors when
the app tried to extract info from an online chess server.  I tracked this down
as far as I am able-- it appears to be only a definition in the makefile:
-mno-cygwin.  How that causes the bug, I don't understand, but presumably the
only difference between Winboard 4.2.7b and 4.2.7a (which works in wine) is the
presence of that option in the makefile.

When -mno-cygwin is present, a call like:

n=sscanf("r-bqk -1 0", "%5c%d%d", str, &i, &j);

only gets the first character into str rather than all 5 like it should, and n
becomes 1 with i and j failing to get read.

Attached is a testcase project to illustrate.  It includes 2 binaries, the only
difference being the presence of -mno-cygwin during the build.  (Line 19 in the
makefile)  To build this testcase, you need the cygwin tools, probably just
normal build tools, and to run wbtest.exe, you need cygwin1.dll which I haven't
included.

wbtest-nocyg.exe: works properly in wine and in windows

wbtest.exe: works properly in windows, but fails in wine


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