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

One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix