Environment implementation - Using the GNU Compiler Collection (GCC)
Description: Using the GNU Compiler Collection (GCC)

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### 4.2 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 and C99 5.1.1.2).

  See Implementation-defined behavior.