GCC 9 Release Series
Changes, New Features, and Fixes

This page is a "brief" summary of some of the huge number of improvements in GCC 9.

Caveats

General Improvements

The following GCC command line options have been introduced or improved.

The following built-in functions have been introduced.

The following attributes have been introduced.

A large number of improvements to code generation have been made, including but not limited to the following.

The following improvements to the gcov command-line utility have been made.

New Languages and Language specific improvements

OpenACC support in C, C++, and Fortran continues to be maintained and improved. Most of the OpenACC 2.5 specification is implemented. See the implementation status section on the OpenACC wiki page for further information.

C family

C

C++

Runtime Library (libstdc++)

D

Fortran

libgccjit

New Targets and Target Specific Improvements

AArch64 & Arm

AArch64 specific
Arm specific

AMD GCN

ARC

C-SKY

IA-32/x86-64

OpenRISC

S/390, System z, IBM z Systems

Operating Systems

Solaris

Windows

Improvements for plugin authors

Other significant improvements

GCC 9.1

This is the list of problem reports (PRs) from GCC's bug tracking system that are known to be fixed in the 9.1 release. This list might not be complete (that is, it is possible that some PRs that have been fixed are not listed here).

GCC 9.2

This is the list of problem reports (PRs) from GCC's bug tracking system that are known to be fixed in the 9.2 release. This list might not be complete (that is, it is possible that some PRs that have been fixed are not listed here).