https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111643
Bug ID: 111643
Summary: __attribute__((flatten)) with -O1 runs out of memory
(killed cc1)
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: lukas.gra...@tu-darmstadt.de
Target Milestone: ---
Created attachment 56017
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56017&action=edit
C file
When I run
gcc -c -O0 runs_out_of_memory.i -o runs_out_of_memory.o
(see the attached .i file) everything is fine. But when I run
gcc -c -O1 runs_out_of_memory.i -o runs_out_of_memory.o
then I get:
gcc: fatal error: Killed signal terminated program cc1
Apparently, quickly runs out of memory. I have 16 GB ram and the program is
rather simple. I tested it with gcc versions 9.4.0, 5.1 and 13.2 (target
x86_64-linux-gnu) on ubuntu 20.04.
I believe the problem is the __attribute__((flatten)) on several methods.
How I created the source file: The code comes from busybox (file
coreutils/expr.c) and musl header files. Additionally, I replaced every
function 'name' with 'name_original' and added a wrapper with
__attribute__((flatten)), for later instrumentation (I did this with a script).
I used that attribute, because to reduce the overhead of the wrapper functions
and I believe this should be fine. My reason why I introduced the wrappers in
the first place was to allow a fine-grained instrumentation of these functions.
