https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111341
Bug ID: 111341
Summary: Elemental operator on zero-sized array seg-faults
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: everythingfunctional at protonmail dot com
Target Milestone: ---
There were some scenarios in the real code for this that it doesn't segfault,
but the following reproducer was able to do it reliably for me.
fpm.toml
name = "empty_elemental"
version = "0.1.0"
license = "license"
author = "Brad Richardson"
maintainer = "everythingfunctio...@protonmail.com"
copyright = "Copyright 2023, Brad Richardson"
[dependencies]
strff = { git = "https://gitlab.com/everythingfunctional/strff.git";, tag =
"v4.0.0" }
iso_varying_string = { git =
"https://gitlab.com/everythingfunctional/iso_varying_string.git";, tag =
"v3.0.3" }
app/main.f90
program main
use iso_varying_string, only: varying_string, operator(//), put_line
use strff, only: join
implicit none
call put_line(join("'" // empty() // "'", ","))
contains
pure function empty()
type(varying_string), allocatable :: empty(:)
allocate(empty(0))
end function
end program main
For context, varying_string just has an allocatable deferred length character
component, operator(//) is elemental, join concatenates an array of strings
with the given separator between each, and put_line is basically just print for
varying_string. So the above program should just print a single, zero length
character.
