Movatterモバイル変換

4 C Implementation-defined behavior

A conforming implementation of ISO C is required to document itschoice of behavior in each of the areas that are designated“implementation defined”. The following lists all such areas,along with the section numbers from the ISO/IEC 9899:1990 and ISO/IEC9899:1999 standards. Some areas are only implementation-defined inone version of the standard.

Some choices depend on the externally determined ABI for the platform(including standard character encodings) which GCC follows; these arelisted as “determined by ABI” below. SeeBinary Compatibility, andhttp://gcc.gnu.org/readings.html. Somechoices are documented in the preprocessor manual. SeeImplementation-defined behavior. Some choices are made by thelibrary and operating system (or other environment when compiling fora freestanding environment); refer to their documentation for details.

• Translation implementation
• Environment implementation
• Identifiers implementation
• Characters implementation
• Integers implementation
• Floating point implementation
• Arrays and pointers implementation
• Hints implementation
• Structures unions enumerations and bit-fields implementation
• Qualifiers implementation
• Declarators implementation
• Statements implementation
• Preprocessing directives implementation
• Library functions implementation
• Architecture implementation
• Locale-specific behavior implementation