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VMS Help CRTL, Feature-Test Macros *Conan The Librarian |
Feature-test macros provide a means for writing portable
programs. They ensure that the Compaq C RTL symbolic names used
by a program do not clash with the symbolic names supplied by the
implementation.
The Compaq C RTL header files are coded to support the use of
a number of feature-test macros. When an application defines a
feature-test macro, the Compaq C RTL header files supply the
symbols and prototypes defined by that feature-test macro and
nothing else. If a program does not define such a macro, the
Compaq C RTL header files define symbols without restriction.
The feature-test macros supported by the Compaq C RTL fall into
the following broad categories for controlling the visibility of
symbols in header files according to the following:
o Standards
o Multiple-version support
o Compatibility
Additional Information (explode) :
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