AN3350 datasheet(92/185 Pages) STMICROELECTRONICS

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C compiler

AN3350

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Doc ID 018512 Rev 2

12.2

C99 extensions

The eTPU build tools C compiler accepts the enhancements to the C language specified by

the ISO/IEC 9899-1999 standard, commonly referred to as “C99.”

●

Controlling C99 extensions

●

Trailing commas in enumerations

●

Compound literal values

●

Designated initializers

●

Predefined Symbol __func__

●

Implicit return from main()

●

Non-constant static data initialization

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Variable argument macros

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Extra C99 keywords

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C++-style comments

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C++-style digraphs

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Empty arrays in structures

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Hexadecimal floating-point constants

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Variable-length arrays

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Unsuffixed decimal literal values

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C99 complex data types

12.2.1

Controlling C99 extensions

Table 13 shows how to control C99 extensions.

12.2.2

Trailing commas in enumerations

When the C99 extensions setting is on, the compiler allows a comma after the final item in a

list of enumerations. Example 27 shows an example.

Example 27 Trailing comma in enumeration example

enum

{

violet,

blue

green,

yellow,

orange,

red, /* OK: accepted if C99 extensions setting is on. */

};

Table 13.

Controlling C99 extensions to the C language

To control this option from here...

use this setting

Source code

#pragma c99

Command line

-c99

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