Bootstrap failure on Linux/x86-64 in Ada

[Richard Kenner]

    >>>gcc -c -g       -I- -I. -Iada -I/cvs/gcc-svn/trunk/gcc/ada 
    >>>/cvs/gcc-svn/trunk/gcc/ada/ada.ads -o ada/ada.o
    >>>ada.ads:16:01: language defined units may not be recompiled

    So you need a -gnat<something> option, or compilation fails?

Yes, because, as it says, the Ada standard does not permit recompilation
of language-defined units.  Obviously, we have to compile them as part
of building the compiler and library, so -gnatg says to ignore that
particular validity check.