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document config setting "-C parallel=n" for number of CPUs to use for compilation

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Nulano 2023-12-31 02:22:05 +01:00
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docs/installation.rst
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@ -390,9 +390,10 @@ After navigating to the Pillow directory, run::
Build Options Build Options
""""""""""""" """""""""""""
* Environment variable: ``MAX_CONCURRENCY=n``. Pillow can use * Config setting: ``-C parallel=n``. Can also be given
multiprocessing to build the extension. Setting ``MAX_CONCURRENCY`` with environment variable: ``MAX_CONCURRENCY=n``. Pillow can use
sets the number of CPUs to use, or can disable parallel building by multiprocessing to build the extension. Setting ``-C parallel=n``
sets the number of CPUs to use to ``n``, or can disable parallel building by
using a setting of 1. By default, it uses 4 CPUs, or if 4 are not using a setting of 1. By default, it uses 4 CPUs, or if 4 are not
available, as many as are present. available, as many as are present.
@ -417,14 +418,13 @@ Build Options
used to compile the standard Pillow wheels. Compiling libraqm requires used to compile the standard Pillow wheels. Compiling libraqm requires
a C99-compliant compiler. a C99-compliant compiler.
* Build flag: ``-C platform-guessing=disable``. Skips all of the * Config setting: ``-C platform-guessing=disable``. Skips all of the
platform dependent guessing of include and library directories for platform dependent guessing of include and library directories for
automated build systems that configure the proper paths in the automated build systems that configure the proper paths in the
environment variables (e.g. Buildroot). environment variables (e.g. Buildroot).
* Build flag: ``-C debug=true``. Adds a debugging flag to the include and * Config setting: ``-C debug=true``. Adds a debugging flag to the include and
library search process to dump all paths searched for and found to library search process to dump all paths searched for and found to stdout.
stdout.
Sample usage:: Sample usage::