[Bug ada/80556] New: [8 Regression] Ada breaks bootstrap on x86_64-apple-darwin16

[dominiq at lps dot ens.fr]

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

            Bug ID: 80556
           Summary: [8 Regression] Ada breaks bootstrap on
                    x86_64-apple-darwin16
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: charlet at gcc dot gnu.org
  Target Milestone: ---

Compiling g-exptty.adb on x86_64-apple-darwin16 at r247343 fails with

/opt/gcc/build_a/./gcc/xgcc -B/opt/gcc/build_a/./gcc/
-B/opt/gcc/gcc8a/x86_64-apple-darwin16.5.0/bin/
-B/opt/gcc/gcc8a/x86_64-apple-darwin16.5.0/lib/ -isystem
/opt/gcc/gcc8a/x86_64-apple-darwin16.5.0/include -isystem
/opt/gcc/gcc8a/x86_64-apple-darwin16.5.0/sys-include    -c -g -O2  -fno-common 
-W -Wall -gnatpg -nostdinc   g-exptty.adb -o g-exptty.o
xgcc: internal compiler error: Illegal instruction: 4 (program gnat1)

and breaks bootstrap. Revision r247285 is OK.