classic
compatsaal2saaTo help you avoid conflicts between the different C language definitions in existence, the IBM C and C++ Compilers support several levels of the C language. Available language levels and their descriptions are:
| Level | Description |
|---|---|
| ansi | Conforms to the American National Standards Institute (ANSI) C standard. |
| classic |
Conforms closely to the K&R level preprocessor, enabling the compilation of many non-ANSI programs. |
| compat |
|
| extended | High compatibility with RT C source code. extended level C is defined as ansi level C, extended for compatibility with the RT compiler. RT compatibility conflicts with the ANSI C standard under certain conditions. |
| saal2 |
Systems Application Architecture (SAA) CPI C Level 2. saal2 level C conforms to SAA C with some deviations. |
| saa |
The highest level SAA C definition available. This is currently SAA Level 2 C. |
| Note: saal2 and saa C language levels are options, and are not part of the SAA Common Programming Interface. | |
You should use the ansi language level for most new programs.
AIX also uses various compiler invocation
modes to provide additional support for specific environments and
levels of the C language.
#pragma langlvl Preprocessor
Directive
