[Bug ada/81878] --disable-bootstrap --enable-languages=ada fails

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81878

--- Comment #16 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
This also breaks 'make all-gnattools' in a bootstrap build:

g++ -std=gnu++98 -static-libstdc++ -static-libgcc -I- -I../rts -I.
-I/home/eric/svn/gcc/gcc/ada -static-libstdc++ -static-libgcc  -DIN_GCC  -g -O2
-W -Wall -o ../../gnatmake b_gnatm.o a-except.o ali.o ali-util.o aspects.o
s-casuti.o alloc.o atree.o binderr.o butil.o casing.o csets.o debug.o elists.o
einfo.o errout.o erroutc.o errutil.o err_vars.o fmap.o fname.o fname-uf.o
fname-sf.o gnatmake.o gnatvsn.o hostparm.o interfac.o i-c.o i-cstrin.o krunch.o
lib.o make.o makeusg.o make_util.o namet.o nlists.o opt.o osint.o osint-m.o
output.o restrict.o rident.o s-exctab.o s-secsta.o s-stalib.o s-stoele.o
scans.o scng.o sdefault.o sfn_scan.o s-purexc.o s-htable.o scil_ll.o sem_aux.o
sinfo.o sinput.o sinput-c.o snames.o stand.o stringt.o styleg.o stylesw.o
system.o validsw.o switch.o switch-m.o table.o targparm.o tempdir.o tree_io.o
types.o uintp.o uname.o urealp.o usage.o widechar.o  ../link.o ../targext.o
../../ggc-none.o ../../libcommon-target.a ../../libcommon.a
../../../libcpp/libcpp.a ../rts/libgnat.a  
../../../libbacktrace/.libs/libbacktrace.a ../../../libiberty/libiberty.a  
-no-pie -ldl
g++: error: unrecognized command line option ‘-no-pie’
../gcc-interface/Makefile:2221: recipe for target '../../gnatmake' failed
make[2]: *** [../../gnatmake] Error 1
make[2]: Leaving directory '/home/eric/build/gcc/native/gcc/ada/tools'
Makefile:188: recipe for target 'gnattools-native' failed
make[1]: *** [gnattools-native] Error 2
make[1]: Leaving directory '/home/eric/build/gcc/native/gnattools'
Makefile:13917: recipe for target 'all-gnattools' failed
make: *** [all-gnattools] Error 2

During the bootstrap, CXX is set to /home/eric/build/gcc/native/./gcc/xg++
-B/home/eric/build/gcc/native/./gcc/ so this still works.