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AN3350

Pragmas for standard C conformance

Doc ID 018512 Rev 2

129/185

Remarks

If you enable this pragma, the compiler accepts many of the language features described by

the ISO/IEC 9899-1999 standard:

●

More rigid type checking.

●

Trailing commas in enumerations.

●

GCC/C99-style compound literal values.

●

Designated initializers.

●

__func__

predefined symbol.

●

Implicit return 0; in main().

●

Non-const static data initializations.

●

Variable argument macros (__VA_ARGS__).

●

bool

and _Bool support.

●

long long

support (separate switch).

●

restrict

support.

●

comments.

●

inline

support.

●

Digraphs.

●

_Complex

and _Imaginary (treated as keywords but not supported).

●

Empty arrays as last struct members.

●

Designated initializers

●

Hexadecimal floating-point constants.

●

Variable length arrays are supported within local or function prototype scope (as

required by the C99 standard).

●

Unsuffixed decimal constant rules.

●

++bool--

expressions.

●

(T) (int-list)

are handled/parsed as cast-expressions and as literals.

●

__STDC_HOSTED__

is 1.

By default, this pragma is disabled.

17.3

c9x

Equivalent to #pragma c99.

17.4

ignore_oldstyle

Controls the recognition of function declarations that follow the syntax conventions used

before ISO/IEC standard C (in other words, “K&R” style).

Syntax

#pragma ignore_oldstyle on | off | reset

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