[Bug bootstrap/81459] New: GNAT 7.1.0 build failed on the Debian 9/x86_64

["barbos at inbox dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81459

            Bug ID: 81459
           Summary: GNAT 7.1.0 build failed on the Debian 9/x86_64
           Product: gcc
           Version: 7.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: barbos at inbox dot ru
  Target Milestone: ---

The build of GNAT 7.1 failed:

$ uname -a
Linux softlab2 4.9.0-2-amd64 #1 SMP Debian 4.9.18-1 (2017-03-30) x86_64
GNU/Linux

$ gnat --version
GNAT GPL 2016 (20160515-49)
...

$ ../gcc-7.1.0/configure --enable-languages=ada
$ make

gcc -c -I./
-I/opt/gnat/lib/gcc/x86_64-pc-linux-gnu/4.9.4/rts-native/adalib/../adainclude
-I/opt/gnat/lib/gcc/x86_64-pc-linux-gnu/4.9.4/rts-native/adalib -I.
-I/home/pum/Projects/xgcc/gcc-7.1.0/gcc/ada -g -O2 -W -Wall -gnatpg -gnata -I-
/home/pum/Projects/xgcc/gcc-7.1.0/gcc/ada/err_vars.ads
gcc -c -I./
-I/opt/gnat/lib/gcc/x86_64-pc-linux-gnu/4.9.4/rts-native/adalib/../adainclude
-I/opt/gnat/lib/gcc/x86_64-pc-linux-gnu/4.9.4/rts-native/adalib -I.
-I/home/pum/Projects/xgcc/gcc-7.1.0/gcc/ada -g -O2 -W -Wall -gnatpg -gnata -I-
/home/pum/Projects/xgcc/gcc-7.1.0/gcc/ada/restrict.adb
restrict.adb:1199:46: "Restricted_Tasking" not declared in "Rident"
restrict.adb:1201:46: "Restricted_Tasking" not declared in "Rident"
gnatmake: "/home/pum/Projects/xgcc/gcc-7.1.0/gcc/ada/restrict.adb" compilation
error
../gcc-interface/Makefile:2640: recipe for target 'gnatmake-re' failed
make[3]: *** [gnatmake-re] Error 4
make[3]: Leaving directory '/home/pum/Projects/xgcc/build-gcc/gcc/ada/tools'
Makefile:215: recipe for target 'gnattools-cross' failed
make[2]: *** [gnattools-cross] Error 2
make[2]: Leaving directory '/home/pum/Projects/xgcc/build-gcc/gnattools'
Makefile:10872: recipe for target 'all-gnattools' failed
make[1]: *** [all-gnattools] Error 2
make[1]: Leaving directory '/home/pum/Projects/xgcc/build-gcc'
Makefile:885: recipe for target 'all' failed
make: *** [all] Error 2