C-Pluff C API: GCC attributes

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# GCC attributes
[Defines]

## Detailed Description

These macros conditionally define GCC attributes for declarations.

They are used in C-Pluff API declarations to enable better optimization and error checking when using GCC. In non-GCC platforms they have empty values.

## Defines
#define | CP_GCC_PURE
| Declares a function as pure function having no side effects.
#define | CP_GCC_NONNULL(...)
| Specifies that some pointer arguments to a function should have non-NULL values.

## Define Documentation

#define CP_GCC_PURE

Declares a function as pure function having no side effects.

This attribute is supported in GCC since version 2.96. Such functions can be subject to common subexpression elimination and loop optimization.

#define CP_GCC_NONNULL | ( | ... |  | ) |

Specifies that some pointer arguments to a function should have non-NULL values.

Takes a variable length list of argument indexes as arguments. This attribute is supported in GCC since version 3.3. It can be used for enhanced error checking and some optimizations.

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