https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108715
Bug ID: 108715
Summary: Infinite loop in the generated assembly with -Os when
strlen is defined in the code
Product: gcc
Version: 12.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: daniel at eyoman dot com
Target Milestone: ---
Created attachment 54426
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54426&action=edit
C file
Hi,
The attached source file is compiled on GCC 12.2.1 with the following command:
gcc -save-temps -Wall -Wextra -Os strlen_bug.c -o strlen_bug
The assembly file, obtained with objdump -d strlen_bug, shows that:
- the for loop dealing with the length calculation has been removed by strlen
- the strlen label jumps to itself
- the program never ends
If the strlen function is removed from the code, the problem doesn't occur.
I wanted to attach the assembly and preprocessed files but I could attach only
one.
