.. _environment-implementation:

Environment
***********

The behavior of most of these points are dependent on the implementation
of the C library, and are not defined by GCC itself.

* The mapping between physical source file multibyte characters
  and the source character set in translation phase 1 (C90, C99 and C11
  5.1.1.2).

  See :ref:`Implementation-defined
  behavior <implementation-defined-behavior>`.