https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123903
Bug ID: 123903
Summary: Usage of unallocated `character` variable in `//` does
not trigger warning
Product: gcc
Version: 15.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: federico.perini at gmail dot com
Target Milestone: ---
This is not a bug report, but rather a suggestion for enhancing the runtime
warnings.
The following code:
```
character(:), allocatable :: s
s = s // 'a' ! intentionally used unallocated in hrs
print *, s
end
```
Never triggers any errors in the Fortran runtime, with any combination of
runtime checks (all, mem, bounds, pointer).
Can be checked here: https://godbolt.org/z/xWcn5YqPT
(Of course -Wmaybe-uninitialize does catch that properly at compile time).
A lengthy explanation of why unallocated character variables are not valid in
concatenation was submitted here: https://github.com/fortran-lang/fpm/pull/1229
That is why I think it may be worthwhile to also notice the gfortran team about
it.
Thank you,
Federico
