https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117684
Bug ID: 117684
Summary: High compiling time for array initialization
Product: gcc
Version: 8.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: Sebastien.Lemetter at de dot bosch.com
Target Milestone: ---
Created attachment 59637
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59637&action=edit
This is the code example which shows the bug. Just copy the file and run the
gcc command
Hi,
We have a complex data structure which should be initialized with non 0
(default) values. If we set the non default value, the compilation time goes
from less than 1s to 5min or more.
We understand that initializing a large memory segment takes time, but
generating the binary code for doing this task should not last long.
Here is the command that we are using for compiling the code:
/usr/bin/g++-8 '-std=c++17' '-D_FORTIFY_SOURCE=2' -MD -MF main.d -g0 -O2
-DNDEBUG -Werror -c main.cpp -o main.o
Here is the exact version of the compiler we are using:
❯ /usr/bin/g++-8 --version
g++-8 (Ubuntu 8.4.0-3ubuntu2) 8.4.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
Here is the OS version we are using:
❯ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.5 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.5 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/";
