|Ada 95 Quality and Style Guide||Chapter 7|
7.6.5 Implementation-Specific Pragmas and Attributes
Avoid pragmas and attributes added by the compiler implementor.
The Ada Reference Manual (1995) permits an implementor to add pragmas and attributes to exploit a particular hardware architecture or software environment. These are obviously even more implementation-specific and therefore less portable than an implementor's interpretations of the predefined pragmas and attributes. However, the Ada Reference Manual (1995) defines a set of annexes that have a uniform and consistent approach to certain specialized needs, namely, real-time systems, distributed systems, information systems, numerics, interfacing to foreign languages, and safety and security. You should always prefer the facilities defined in the annexes to any vendor-defined pragmas and attributes.
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