gcc/doc/cpp/environment-variables.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. index:: environment variables
   7
   8 .. _environment-variables:
   9
  10 Environment Variables
  11 ---------------------
  12
  13 This section describes the environment variables that affect how CPP
  14 operates.  You can use them to specify directories or prefixes to use
  15 when searching for include files, or to control dependency output.
  16
  17 Note that you can also specify places to search using options such as
  18 :option:`-I`, and control dependency output with options like
  19 :option:`-M` (see :ref:`invocation`).  These take precedence over
  20 environment variables, which in turn take precedence over the
  21 configuration of GCC.
  22
  23 .. include:: ../../../doc/cppenv.rst