据GCC官网消息，正在开发的新版本原计划以版本号4.10发布，目前已改为：开发过程中标记为版本号5.0.0、以版本号5.0.1发布预览版、以版本号5.1.0发布正式版。Bug修复等更新版本将以5.1.1开发版、5.2.0发布版，5.2.1开发版、5.3.0发布版等进行。下一版本以6.x.y迭代此规则。
GCC官方给出的理由是：原来的主版本号意义不大，对开发者不能提供有用的信息。
原本GCC4代已持续10年（2005年2月进入4.0分支至今），每次版本升级均在次版本号位＋1，而Bug修复等在第三位标记，直到最近4.9.0发布（2014年4月），4.9.1发布（2014年7月）
GCC 发布时间线：
... former releases ... | +-- GCC 3.0 branch created ------+ | (Feb 12 2001) / | v v GCC 3.0 release (Jun 18 2001) New development plan announced / | (Jul 18 2001) v | GCC 3.0.1 release (Aug 20 2001) | / v v GCC 3.1 Stage 1 (ended Oct 15 2001) GCC 3.0.2 release (Oct 25 2001) | / v v GCC 3.1 Stage 2 (ended Dec 19 2001) GCC 3.0.3 release (Dec 20 2001) | / v v GCC 3.1 Stage 3 (ended Feb 26 2002) GCC 3.0.4 release (Feb 20 2002) | +-- GCC 3.1 branch created ------+ | / | v v GCC 3.1 release (May 15 2002) GCC 3.2 Stage 1 (ended Jun 22 2002) / | v | GCC 3.1.1 release (Jul 25 2002) | / v v New development plan announced Branch renamed to GCC 3.2 to | (Jul 14 2002) accommodate for C++ ABI fixes | (C++ binary incompatible with | GCC 3.1, see release info) | / | v | GCC 3.2 release (Aug 14 2002) | / | v | GCC 3.2.1 release (Nov 19 2002) | / | v | GCC 3.2.2 release (Feb 05 2003) | / | v | GCC 3.2.3 release (April 22 2003) v GCC 3.3 Stage 2 (ends Aug 15 2002) | v GCC 3.3 Stage 3 (ends Oct 15 2002) | +-- GCC 3.3 branch created ------+ | (Dec 14 2002) / | v | GCC 3.3 release (May 13 2003) | / v v GCC 3.4 Stage 1 (ends July 4 2003) GCC 3.3.1 release (Aug 8 2003) | / v v GCC 3.4 Stage 2 (ends October 15 2003) GCC 3.3.2 release (Oct 17 2003) | / v v GCC 3.4 Stage 3 GCC 3.3.3 release (Feb 14 2004) | / | v | GCC 3.3.4 release (May 31 2004) | / | v | GCC 3.3.5 release (Sep 30 2004) | / | v | GCC 3.3.6 release (May 03 2005) | +-- GCC 3.4 branch created ------+ | (Jan 16 2004) / | v Tree SSA infrastructure GCC 3.4.0 release (Apr 18 2004) merged to mainline (May 17 2004) / | v v GCC 3.4.1 release (Jul 1 2004) GCC 4.0 Stage 2 / | v v GCC 3.4.2 release (Sep 6 2004) GCC 4.0 Stage 3 / | v | GCC 3.4.3 release (Nov 4 2004) | / | v | GCC 3.4.4 release (May 18 2005) | / | v | GCC 3.4.5 release (Nov 30 2005) | / | v | GCC 3.4.6 release (Mar 06 2006) | +-- GCC 4.0 branch created ------+ | (Feb 25 2005) / v v GCC 4.1 Stage 1 (ends April 25 2005) GCC 4.0.0 release (Apr 20 2005) | / v v GCC 4.1 Stage 2 (ends July 8 2005) GCC 4.0.1 release (Jul 7 2005) | / v v GCC 4.1 Stage 3 GCC 4.0.2 release (Sep 28 2005) | / | v | GCC 4.0.3 release (Mar 10 2006) | / | v | GCC 4.0.4 release (Jan 31 2007) | +-- GCC 4.1 branch created ------+ | (Nov 18 2005) / v v GCC 4.2 Stage 1 (ends Jan 18 2006) GCC 4.1.0 release (Feb 28 2006) | / v v GCC 4.2 Stage 2 (ends Mar 18 2006) GCC 4.1.1 release (May 24 2006) | / v v GCC 4.2 Stage 3 GCC 4.1.2 release (Feb 13 2007) | | +-- GCC 4.2 branch created ------+ | / v v GCC 4.3 Stage 1 (starts 2006-10-20) GCC 4.2.0 release (2007-05-13) | / v v GCC 4.3 Stage 2 (starts 2007-01-20) GCC 4.2.1 release (2007-07-18) | / v v GCC 4.3 Stage 3 (starts 2007-09-12) GCC 4.2.2 release (2007-10-07) | / | v | GCC 4.2.3 release (2008-02-01) | / | v | GCC 4.2.4 release (2008-05-19) | | +-- GCC 4.3 branch created ------+ | / v v GCC 4.4 Stage 1 (starts 2008-02-18) GCC 4.3.0 release (2008-03-05) | / | v | GCC 4.3.1 release (2008-06-06) | / | v v GCC 4.3.2 release (2008-08-27) GCC 4.4 Stage 3 (starts 2008-09-01) / | v | GCC 4.3.3 release (2009-01-24) | / | v | GCC 4.3.4 release (2009-08-04) | / | v | GCC 4.3.5 release (2010-05-22) | / | v | GCC 4.3.6 release (2011-06-27) | +-- GCC 4.4 branch created ------+ | / v v GCC 4.5 Stage 1 (starts 2009-03-27) GCC 4.4.0 release (2009-04-21) | / | v | GCC 4.4.1 release (2009-07-22) GCC 4.5 Stage 3 (starts 2009-10-01) / | v | GCC 4.4.2 release (2009-10-15) | / | v | GCC 4.4.3 release (2010-01-21) | / | v | GCC 4.4.4 release (2010-04-29) | / | v | GCC 4.4.5 release (2010-10-01) | / | v | GCC 4.4.6 release (2011-04-16) | / | v | GCC 4.4.7 release (2012-03-13) | +-- GCC 4.5 branch created ------+ | / v v GCC 4.6 Stage 1 (starts 2010-04-06) GCC 4.5.0 release (2010-04-14) | / | v | GCC 4.5.1 release (2010-07-31) GCC 4.6 Stage 3 (starts 2010-11-03) / | v | GCC 4.5.2 release (2010-12-16) | / | v | GCC 4.5.3 release (2011-04-28) | / | v | GCC 4.5.4 release (2012-07-02) | +-- GCC 4.6 branch created ------+ | / v v GCC 4.7 Stage 1 (starts 2011-03-14) GCC 4.6.0 release (2011-03-25) | / | v | GCC 4.6.1 release (2011-06-27) | / | v | GCC 4.6.2 release (2011-10-26) GCC 4.7 Stage 3 (starts 2011-11-08) / | v | GCC 4.6.3 release (2012-03-01) | / | v | GCC 4.6.4 release (2013-04-12) | +-- GCC 4.7 branch created ------+ | / v v GCC 4.8 Stage 1 (starts 2012-03-02) GCC 4.7.0 release (2012-03-22) | / | v | GCC 4.7.1 release (2012-06-14) | / | v | GCC 4.7.2 release (2012-09-20) GCC 4.8 Stage 3 (starts 2012-11-06) / | v | GCC 4.7.3 release (2013-04-11) | / | v | GCC 4.7.4 release (2014-06-12) | +-- GCC 4.8 branch created ------+ | / v v GCC 4.9 Stage 1 (starts 2013-03-16) GCC 4.8.0 release (2013-03-22) | / | v | GCC 4.8.1 release (2013-05-31) | / | v | GCC 4.8.2 release (2013-10-16) | / GCC 4.9 Stage 3 (starts 2013-11-22) v | GCC 4.8.3 release (2014-05-22) | +-- GCC 4.9 branch created ------+ | / v v GCC 4.10 Stage 1 (starts 2014-04-11) GCC 4.9.0 release (2014-04-22) | / | v | GCC 4.9.1 release (2014-07-16) | New GCC versioning scheme announced | GCC 5 Stage 1 | v
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