https://gcc.gnu.org/pipermail/gcc-bugs/2003-March/072868.html
ada/9911: gnatmake fails to link when GCC configured for sjlj
adafails
https://gcc.gnu.org/onlinedocs/gcc-4.4.4/gnat_ugn_unw/Running-gnatmake.html
Running gnatmake - GNAT User's Guide
runninggnatuserguide
https://gcc.gnu.org/onlinedocs/gcc-4.4.4/gnat_ugn_unw/How-gnatmake-Works.html
How gnatmake Works - GNAT User's Guide
worksgnatuserguide