| .. _environment_variables: |
| |
| ================================================ |
| Environment Variables Impacting the Build System |
| ================================================ |
| |
| Various environment variables have an impact on the behavior of the |
| build system. This document attempts to document them. |
| |
| AUTOCLOBBER |
| If defines, the build system will automatically clobber as needed. |
| The default behavior is to print a message and error out when a |
| clobber is needed. |
| |
| This variable is typically defined in a :ref:`mozconfig <mozconfig>` |
| file via ``mk_add_options``. |
| |
| REBUILD_CHECK |
| If defined, the build system will print information about why |
| certain files were rebuilt. |
| |
| This feature is disabled by default because it makes the build slower. |
| |
| MACH_NO_TERMINAL_FOOTER |
| If defined, the terminal footer displayed when building with mach in |
| a TTY is disabled. |
| |
| MACH_NO_WRITE_TIMES |
| If defined, mach commands will not prefix output lines with the |
| elapsed time since program start. This option is equivalent to |
| passing ``--log-no-times`` to mach. |
