1 1 4.2 Environment 1 =============== 1 1 The behavior of most of these points are dependent on the implementation 1 of the C library, and are not defined by GCC itself. 1 1 * 'The mapping between physical source file multibyte characters and 1 the source character set in translation phase 1 (C90, C99 and C11 1 5.1.1.2).' 1 11 ⇒Implementation-defined behavior (cpp)Implementation-defined behavior. 1