Category
Pragma equivalent
None
Purpose
Controls whether the specified name is treated as a keyword or as an identifier whenever it appears in your program source.
Defaults
By default all the built-in keywords defined in the C and C++ language standards are reserved as keywords.
Usage
You cannot add keywords to the language with this option. However, you can use -qnokeyword=keyword_name to disable built-in keywords, and use -qkeyword=keyword_name to reinstate those keywords.
This option can be
used with all C++ built-in keywords.
This
option can also be used with the following
C keywords: - asm
- inline
- restrict
- typeof
Note: asm is not a keyword when
the -qlanglvl option is set to stdc89 or stdc99.
asm is not a keyword when
the -qlanglvl option is set to stdc89 or stdc99. Predefined macros
- __BOOL__ is defined
to 1 by default; however, it is undefined when -qnokeyword=bool is
in effect.
- __C99_INLINE is defined to 1 when -qkeyword=inline is
in effect.
- __C99_RESTRICT is defined to 1 when -qkeyword=restrict is in effect.
- __IBM_GCC_ASM is defined to 1 when -qkeyword=asm is
in effect. (In C++ it is defined by default.)
- __IBM__TYPEOF__ is defined to 1 when -qkeyword=typeof is in effect.
Examples
You
can reinstate bool with the following invocation:
xlc++ -qkeyword=bool
You can reinstate typeof with the following
invocation: xlc -qkeyword=typeof