Resources for “Optimization in GCC”

GCC Home page:

Using the GNU Compiler Collection (GCC):



Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

-O1 and inline-functions

Bill McConaughey's picture

The article states that -O is equivalent to -O0 (no optimization). The manual says -O0 and no "-O" option at all are the same, and -O is equivalent to -O1.
I am using -O with programs that require inline (using in and out macros), and I get inline function expansions for those and for memcpy etc., but the manual says the inline-functions optimization is only done with -O3. Is this an error in the manual?

Where are the source files fr

Anonymous's picture

Where are the source files from your article. I am specifically interested in your timing calls. TIA

Geek Guide
The DevOps Toolbox

Tools and Technologies for Scale and Reliability
by Linux Journal Editor Bill Childers

Get your free copy today

Sponsored by IBM

8 Signs You're Beyond Cron

Scheduling Crontabs With an Enterprise Scheduler
On Demand
Moderated by Linux Journal Contributor Mike Diehl

Sign up and watch now

Sponsored by Skybot