https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97818
Bug ID: 97818
Summary: PDT Parameterized Derived Type fails with SIGABRT at
-O1
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: adamjermyn at gmail dot com
Target Milestone: ---
Created attachment 49558
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49558&action=edit
Minimal broken example. Compile with -O1. Should result in SIGABRT.
Hello,
I encountered an error (SIGABRT on macOS) using parameterized derived types in
Fortran with gfortran v10.2.0. The error only appears at -O1 or above. I've
attached a minimal broken example. An example of the error message is:
---
a.out(64288,0x116e325c0) malloc: *** error for object 0x7ffee429c8e8: pointer
being freed was not allocated
a.out(64288,0x116e325c0) malloc: *** set a breakpoint in malloc_error_break to
debug
Program received signal SIGABRT: Process abort signal.
---
The derived type supports arithmetic operations (+-/*), but for the minimal
example I've stripped this down to just addition, and removed the actual
addition logic (just leaving empty functions).
>From some testing, the error only appears when there are common
sub-expressions. So for instance in the attached example I've written
z = (x + 2.0) + ((x + 2.0) + 1.0)
which fails. When I manually break the expression up into smaller pieces that
don't share common sub-expressions (as below) it works:
y = x + 2.0
z = y + (y + 1.0)
I've tested ~10 examples like this and only ones where common sub-expressions
occur in a single function produce this problem.
I'm happy to provide a version of this example that has the arithmetic logic
filled in if that would be helpful.
If this is not a compiler problem and I'm doing something wrong I would greatly
appreciate being pointed in the right direction.
Many thanks,
Adam
