https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118315
Bug ID: 118315
Summary: fmt library export module for -g, -Og or -O0 crashes
compiler; -O1 and -O2 works
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ladislav.dobrovsky at gmail dot com
Target Milestone: ---
The fmt library (https://github.com/fmtlib/fmt) crashes the compiler with -g,
-Og or O0; however -O1 and higher optimization level works well.
I have recently encoutered the crash first on gcc 12, so I have tried versions
13.3.0 and 14.2.
gcc 12 does not provide a bugreport file and claims "The bug is not
reproducible, so it is likely a hardware or OS problem."
However the later versions do produce a bugreport file, I attach the one for
14.2.0.
The command:
g++-14 -c -g -std=c++20 -Wall -Wextra -o fmt.o fmt.cc -I../include -fmodules-ts
-D_GLIBCXX_ASSERTIONS -D_GLIBCXX_DEBUG -freport-bug
System info:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
$ uname -a
Linux dhcp227 6.1.0-26-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.112-1
(2024-09-30) x86_64 GNU/Linux
