[Bug ada/66608] gnat 5.1 fails with compilation abandoned, minimal testcase included

[siflfran at hawo dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66608

--- Comment #1 from siflfran at hawo dot net ---
 % gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/5.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /usr/src/gcc-5.1.0/configure --disable-multilib
--enable-checking=release --disable-werror --with-linker-hash-style=gnu
--enable-lto --disable-isl-version-check --enable-cloog-backend=isl
--enable-linker-build-id --enable-gnu-unique-object --enable-bootstrap
--disable-libstdcxx-pch --enable-clocale=gnu --enable-__cxa_atexit
--enable-threads=posix --enable-shared
--enable-languages=ada,c,c++,fortran,go,objc,java,lto
--with-bugurl=http://bugs.sourcemage.org --infodir=/usr/share/info
--mandir=/usr/share/man --libexecdir=/usr/lib --libdir=/usr/lib --prefix=/usr
--enable-libada --build=x86_64-pc-linux-gnu --with-system-zlib --enable-nls
--enable-libgcj --disable-plugin --enable-libquadmath
Thread model: posix
gcc version 5.1.0 (GCC)