On Wed, 2020-06-10 at 10:26 -0500, Richard Shaw wrote:
> I'm working on the ability to produce Windows builds of fldigi using
> the Fedora MinGW stack.
>
> Currently the 32bit builds compile with little to no warnings and
> appear to function properly, however, on 64bit builds there is a ton
> more warnings (I have to use -fpermissive) and the program segfaults
> shortly after launching.
>
> I have tried to capture a gdb stack trace but it produces no results... zero.
The most common cause of this is work-size incorrectness, e.g. misuse
of LONG vs long, deprecated use of DWORD vs DWORD_PTR, etc. in variable
types being passed to (or returned from) Win32 APIs. Those warnings
might be indicative of such issues.
> For instance:
> dialogs/fl_digi.cxx: In function 'void cb_mnuVisitURL(Fl_Widget*, void*)':
> dialogs/fl_digi.cxx:2616:68: error: cast from 'HINSTANCE' {aka
> 'HINSTANCE__*'} to 'int' loses precision [-fpermissive]
> 2616 | if ((int)ShellExecute(NULL, "open", url, NULL, NULL, SW_SHOWNORMAL)
> <= 32)
> | ^
HINSTANCE is a pointer, so that's to be expected. Even though the docs
say to cast to int, INT_PTR might be a safer choice here.
--
Yaakov Selkowitz
Senior Software Engineer - Platform Enablement
Red Hat, Inc.
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