Datasheet

C and C++ Compilers

Note

This behavior is not in accordance with the ANSI C standard.

If the other operand in the expression has type

double

, a constant of

unspecified type is converted to

double

. A cast of a constant of

unspecified type to type T produces a constant of type T (Example 2-1).

Example 2-1 Double and float

float f1(float x) { return x + 1.0; } // Uses float add and is treated the same

// as f2() below, a warning is issued.

float f2(float x) { return x + 1.0f;} // Uses float add with no warning, with

// or without -auto_float_constants.

float f3(double x) { return x + 1.0;} // Uses double add,

// no special treatment.

float f4(float x) { return x + (double)1.0;} // Uses double add,

// no special treatment.

Controlling code and data sections

-zo

This option generates one ELF section for each function in source file.

Output sections are named with the same name as the function that

generates the section. For example:

int f(int x) { return x+1; }

compiled with

-zo

gives:

AREA ||i.f||, CODE, READONLY

f PROC

ADD r0,r0,#1

MOV pc,lr

This option enables the linker to remove unused functions when the

default

-remove

linker option is active. This option increases code size

sightly (typically by a few percent) for some functions because it reduces

the potential for sharing addresses, data, and string literals between

functions. However, when creating code for a library, it can prevent

unused functions being included at the link stage. This can result in the

reduction of the final image size. The option can be used with a linker

scatter-loading description file to place some functions in fast memory

and others in slow memory (see the section on scatter-loading files in the

ADS Linker and Utilities Guide). You can also use a scatter-loading file