https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91413
Bug ID: 91413
Summary: [F2018]: Procedures are recursive by default;
switching from stack to static allocation is not safe
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: jb at gcc dot gnu.org
Target Milestone: ---
As of Fortran 2018, procedures are recursive by default. However, currently
GFortran places automatic arrays larger than the limit specified by
-fmax-stack-var-size= (default 32768 bytes(?)) in static memory, which breaks
reentrancy and thread-safety. Removing this outright, in effect making
-frecursize the default, is probably not OK either as that would cause many
applications to crash due to exhausting stack space. The remaining option then
would be to switch to using heap memory rather than static memory for local
arrays going over the limit.
For a thread on this topic, see
https://gcc.gnu.org/ml/fortran/2017-12/msg00082.html
