Beta Branch add NGINX_DEVTOOLSETGCC for devtoolset-3 GCC 4.9 CentOS 7 nginx in 12…

add NGINX_DEVTOOLSETGCC for devtoolset-3 GCC 4.9 CentOS 7 nginx in 123.09beta01

CentOS 7 uses GCC 4.8.5 version which satisfies ngx_pagespeed 1.10+ and ngx_brotli mininum GCC requires of 4.8+. CentOS 6 uses GCC 4.4.7 and requires devtoolset-3 package's GCC 4.9. This update adds a new option to control devtoolset-3 GCC 4.9 usage on CentOS 7 via NGINX_DEVTOOLSETGCC='n' which is disabled by default. Nginx is compiled with GCC 4.9 instead of system GCC 4.8.5 on CentOS 7 when enabled via setting NGINX_DEVTOOLSETGCC='y' in persistent config file /etc/centminmod/custom_config.inc and then recompile nginx via centmin.sh menu option 4. This opens up the doors for future devtoolset-4 support for GCC 5.3 and so forth on CentOS systems.

Centmin Mod Nginx can be compiled with either GCC or Clang compilers and defaults to using Clang via CLANG='y' option in centmin.sh. You can override this and switch from default Clang to GCC compilers for Nginx via CLANG='n' variable set in persistent config file /etc/centminmod/custom_config.inc and then recompile nginx via centmin.sh menu option 4.

So basically for CentOS 7 to use GCC 4.9 via devtoolset-3, set in persistent config file /etc/centminmod/custom_config.inc the following variables:

Code (Text):

NGINX_DEVTOOLSETGCC='y'
CLANG='n'

then recompile nginx via centmin.sh menu option 4

Running command below will tell you what Nginx is compiled and built with

Code (Text):

nginx -V

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123.09beta01 branch

• Branch: GitHub - centminmod/centminmod at 123.09beta01
• Commit History: Commits · centminmod/centminmod · GitHub

 

centmin.sh menu option 4 recompile on CentOS 7 to use GCC 4.9 via devtoolset-3, set in persistent config file /etc/centminmod/custom_config.inc the following variables:

Code (Text):

NGINX_DEVTOOLSETGCC='y'
CLANG='n'

CentOS 7 -march=native and gcc 4.9.2

 

mainly right now mainly that nginx compilation/installs/upgrade are also more optimised specifically for intel processors - particularly better optimised for newer Haswell and higher processors.

 

find cpu used on server

Code (Text):

cat /proc/cpuinfo

if you set CLANG='n' to use GCC, centmin mod will auto detect intel processor or not and run accordingly

 

yeah Intel though centmin mod automatically detects and uses appropriate GCC options when CLANG='n' is set in persistent config file

 

yup

• GCC results in software compiled/installed that performs faster but takes longer to compile - ALOT longer !
• Clang results in faster compiling but not necessarily faster software

 

looks good