Problems with linking and std c++ library when using -mnocygwin

[Eric Blake]

> cygwin can compile the .cpp files but when linking everything together, 
> always "undefined reference" messages appear for the line with close():
> 
> ----------
> g++  -mno-cygwin -w -march=i686 -Dstricmp=strcasecmp -Dstrcmpi=strcasecmp 
> -I"./someDir" 
>  -c -o x1.o x1.cpp
> ...
> g++ -mno-cygwin -fPIC -shared -o xxx_i686.dll  x1.o  x2.o  x3.o ... -lm

Using -mno-cygwin means you are no longer compiling a cygwin app,
but using the MingW cross-compiler bundled with cygwin, but not
fully supported on this list.  You are better off asking on the mingw
list in that case.  One thing is for certain - you cannot mix files
compiled for cygwin with files compiled with -mno-cygwin; if that
has happened, that would explain the link errors you are seeing.

-- 
Eric Blake

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