Bootstrap failure on Linux/x86-64 in Ada

[Arnaud Charlet]

> 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
> make[3]: *** [ada/ada.o] Error 1
> 
> This worked 24 hours ago - with the same bootstrap compiler.
> 
> I'm trying to hunt down the change now,

This must be a Makefile/configure change, since -gnatpg must be passed
to each Ada file compiled as part of ADAFLAGS (see ada/Makefile.in)

Arno