Finding variable-length arrays in code

Question

When the size of my input is big enough, segmentation fault sprouts where variable-length arrays are used in a project. I want to remove them all, how to make GCC display every declaration it finds of a variable-length array?

I have tried using -Wstack-usage=1000 and filtering for the message warning: stack usage might be unbounded, but that gives me the function, not the declaration. Is there a better way?

use option -std=c89 -pedantic then warning: ISO C90 forbids variable length array — BLUEPIXY
– BLUEPIXY, Commented Mar 15, 2016 at 14:05
Removing all VLAs sound like overkill. You just need to remove oversized or VLAs with unpredictable size. Maybe you can grep them. — too honest for this site
– too honest for this site, Commented Mar 15, 2016 at 14:07
Well, I don't really consider a VLA where the size is a static const variable... — lvella
– lvella, Commented Mar 15, 2016 at 14:08
I'm mildly alarmed just how terrible the code has to be if knowing the function that contains the VLA is not enough. — user3185968
– user3185968, Commented Mar 15, 2016 at 21:15

lvella · Accepted Answer · 2016-03-15 14:13:04Z

8

I was pretty sure I have done that before, and thanks to the comments I found the solution again: use -Wvla compiler switch.

answered Mar 15, 2016 at 14:13

lvella

13.6k13 gold badges61 silver badges121 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Finding variable-length arrays in code

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related