error: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `len'
- https://cygwin.com/ml/cygwin/2014-04/msg00058.html
- https://stackoverflow.com/questions/10486116/what-does-this-gcc-error-relocation-truncated-to-fit-mean
- https://www.technovelty.org/c/relocation-truncated-to-fit-wtf.html
error: undefined symbols not allowed
- http://www.gnu.org/software/libtool/manual/html_node/LT_005fINIT.html
- http://stackoverflow.com/questions/17487891/libtool-undefined-symbols-not-allowedin-i686-pc-mingw32-shared#22884787
error: undefined reference to winmain
- http://stackoverflow.com/questions/33734016/undefined-reference-to-winmain-with-cygwin-and-cmake
- http://stackoverflow.com/questions/13871617/winmain-and-main-in-c-extended
Autotools:
- https://www.sourceware.org/autobook/autobook/autobook_135.html
- https://www.sourceware.org/autobook/autobook/autobook_136.html
- https://sourceware.org/autobook/autobook/autobook_137.html
- http://stackoverflow.com/questions/26151995/autotools-make-doesnt-create-dll-under-cygwin
- https://autotools.io/libtool/windows.html
Cygwin:
General: