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From: Lee <ler762 AT gmail DOT com>
Date: Fri, 8 Sep 2017 16:01:22 -0400
Message-ID: <CAD8GWsuCBxO_8R9uBZwkGnbnJnV5-DdnvMvJ7txF0Ww6McYXoQ@mail.gmail.com>
Subject: Re: i686-w64-mingw32-gcc -fstack-protector-strong
To: cygwin AT cygwin DOT com
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On 9/8/17, Marco Atzeri  wrote:
> On 08/09/2017 20:53, Lee wrote:
>> On 9/8/17, Marco Atzeri   wrote:
>>> On 08/09/2017 16:14, Lee wrote:
>>>> I'm hoping that I'm just missing a library, but which one?  Even
>>>> better, how to tell which one?
>>>>
>>>> $ i686-w64-mingw32-gcc -o div.exe div.c
>>>> $ ./div
>>>>     works
>>>>
>>>> $ i686-w64-mingw32-gcc -fstack-protector-strong -o div.exe div.c
>>>> $ ./div
>>>> C:/cygwin/home/Lee/t/div.exe: error while loading shared libraries: ?:
>>>> cannot open shared object file: No such file or directory
>>>>
>>>> $ ldd div.exe
>>>>           ntdll.dll => /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
>>>> (0x7ffef5c50000)
>>>>           ??? => ??? (0x778f0000)
>>>>           wow64.dll => /cygdrive/c/WINDOWS/System32/wow64.dll
>>>> (0x50e50000)
>>>>           wow64win.dll => /cygdrive/c/WINDOWS/System32/wow64win.dll
>>>> (0x50dd0000)
>>>>
>>>
>>> try
>>>     cygcheck ./div.exe
>>
>> nothing useful for a non-cygwin program?
>> $ cygcheck ./div.exe
>> C:\cygwin\home\Lee\t\div.exe
>
> cygcheck works also for not cygwin program
> ( cygcheck --help for details)

   <.. snip examples ..>
> You can also use
>
>   $ objdump -x ./net.exe |grep -i "dll name"
   <.. snip output..>

that's interesting
I've still got the 'i686-w64-mingw32-gcc -fstack-protector-strong' executable:
$ ./div.exe
C:/cygwin/home/Lee/t/div.exe: error while loading shared libraries: ?:
cannot open shared object file: No such file or directory

$ objdump -x ./div.exe | egrep -i "dll name"
        DLL Name: KERNEL32.dll
        DLL Name: msvcrt.dll
        DLL Name: libssp-0.dll

https://cygwin.com/cgi-bin2/package-grep.cgi?grep=libssp&arch=x86_64
shows libssp0 as the GCC Stack-Smashing Protection runtime library
but I don't see anything like that with a leading "mingw64-i686-"
name, so I'm out of luck?

Thanks,
Lee

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