On 09/25/2017 06:33 PM, Steven Penny wrote:
> On Mon, 25 Sep 2017 14:17:28, JonY wrote:
>> You can actually use Cygwin gdb to debug and see what went wrong,
>> assuming the debug symbols are around.
>>
>> Sorry if I'm not much help, kind of busy these days.
> 
> New command:
> 
> x86_64-w64-mingw32-g++ -g -static -o z z.cpp
> 
> Output:
> 
> (gdb) run
> Starting program: /tmp/z [New Thread 5956.0xfe4]
> Program received signal SIGSEGV, Segmentation fault.
> std::ostream::sentry::sentry (this=this@entry=0x22fd90, __os=...)
>  at /cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/
>  mingw64-x86_64-gcc-6.3.0-1.x86_64/src/gcc-6.3.0/libstdc++-v3/include/bits/
>  ostream.tcc:51
> 51 /cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/
>  mingw64-x86_64-gcc-6.3.0-1.x86_64/src/gcc-6.3.0/libstdc++-v3/include/bits/
>  ostream.tcc: No such file or directory.
> (gdb) backtrace
> #0  std::ostream::sentry::sentry (this=this@entry=0x22fd90, __os=...)
>    at /cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/
>   
> mingw64-x86_64-gcc-6.3.0-1.x86_64/src/gcc-6.3.0/libstdc++-v3/include/bits/
>    ostream.tcc:51
> #1  0x000000000049ece9 in std::__ostream_insert<char,
> std::char_traits<char> >
>  (__out=...,  __s=__s@entry=0x4ab031 <std::piecewise_construct+1> "cout
> test\n", __n=10)
>  at /cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/
>  mingw64-x86_64-gcc-6.3.0-1.x86_64/src/gcc-6.3.0/libstdc++-v3/include/bits/
>  ostream_insert.h:82
> #2  0x00000000004a3547 in std::operator<< <std::char_traits<char> > (
>  __out=..., __s=0x4ab031 <std::piecewise_construct+1> "cout test\n")
>  at /cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/
>  mingw64-x86_64-gcc-6.3.0-1.x86_64/src/gcc-6.3.0/libstdc++-v3/include/std/
>  ostream:561
> #3  0x00000000004015e0 in main () at z.cpp:3
> 

Looks like the ostream is not properly initialized, all the C++
constructors involved makes it even more messy to debug.