AN3350 datasheet(97/185 Pages) STMICROELECTRONICS

97 / 185 page

AN3350

C compiler

Doc ID 018512 Rev 2

97/185

sizeof(4294967295)

== sizeof(long long)

sizeof(4294967295u) == sizeof(unsigned long)

#pragma c99 off

sizeof(4294967295)

== sizeof(unsigned long)

sizeof(4294967295u) == sizeof(unsigned long)

12.2.16

C99 complex data types

The compiler supports the C99 complex and imaginary data types when the

C99 extensions

option is enabled. Example 37 shows an example.

Example 37 C99 complex data type

#include <complex.h>

complex double cd = 1 + 2*I;

Note:

This feature is currently not available for all targets.

Use #if __has_feature(C99_COMPLEX) to check if this feature is available for your

target.

12.3

GCC extensions

The compiler accepts many of the extensions to the C language that the GCC (Gnu

Compiler Collection) tools allow. Source code that uses these extensions does not conform

to the ISO/IEC 9899-1990 C (“C90”) standard.

●

Controlling GCC extensions

●

Initializing automatic arrays and structures

●

The sizeof() operator

●

Statements in expressions

●

Redefining macros

●

The typeof() operator

●

Void and function pointer arithmetic

●

The __builtin_constant_p() operator

●

Forward declarations of static arrays

●

Omitted operands in conditional expressions

●

The __builtin_expect() operator

●

Void return statements

●

Minimum and maximum operators

●

Local labels

12.3.1

Controlling GCC extensions

Table 16 shows how to turn GCC extensions on or off.

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