https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96486
--- Comment #4 from Susi Lehtola <jussilehtola at fedoraproject dot org> ---
$ export HOSTNAME=foo
$ ./a.out
$
$ export HOSTNAME=
$ ./a.out
Fortran runtime error: Zero-length string passed as value to
get_environment_variable.
Error termination. Backtrace:
#0 0x7f25c93aadf1 in ???
#1 0x7f25c93ab939 in ???
#2 0x7f25c93abe60 in ???
#3 0x7f25c960ce53 in ???
#4 0x401267 in ???
#5 0x4012c4 in ???
#6 0x7f25c903a041 in __libc_start_main
at ../csu/libc-start.c:308
#7 0x4010ad in ???
#8 0xffffffffffffffff in ???
$
