[Bug target/80556] [8 Regression] bootstrap failure for Ada compiler

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80556

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The last successful bootstrap is r247298; r247301 fails as reported in comment
0; r247299 fails for a different reason:

/opt/gcc/p_build/./gcc/xgcc -B/opt/gcc/p_build/./gcc/
-B/opt/gcc/gcc8p-247299p1/x86_64-apple-darwin16.5.0/bin/
-B/opt/gcc/gcc8p-247299p1/x86_64-apple-darwin16.5.0/lib/ -isystem
/opt/gcc/gcc8p-247299p1/x86_64-apple-darwin16.5.0/include -isystem
/opt/gcc/gcc8p-247299p1/x86_64-apple-darwin16.5.0/sys-include    -c -g -O2 
-fno-common  -W -Wall -gnatpg -nostdinc   s-excmac.ads -o s-excmac.o
cannot generate code for file s-excmac.ads (package spec)