-fasm (-qasm)

Pragma equivalent

None.

Purpose

Controls the interpretation and subsequent generation of code for assembler language extensions.

When -qasm is in effect, the compiler generates code for assembly statements in the source code. Suboptions specify the syntax used to interpret the content of the assembly statement.

Note: The system assembler program must be available for this command to take effect.

Syntax


        .-asm----.   
>>- -f--+-no-asm-+---------------------------------------------><


        .-asm--+------------+-.   
        |      |    .-gcc-. | |   
        |      '-=--+-----+-' |   
>>- -q--+-noasm---------------+--------------------------------><

Defaults

-qasm=gcc or -fasm

Parameters

gcc: Instructs the compiler to recognize the extended GCC syntax and semantics for assembly statements.

Specifying -qasm without a suboption is equivalent to specifying the default.

Usage

C only At language levels stdc89 and stdc99, token asm is not a keyword. At all the other language levels, token asm is treated as a keyword. C only

C++ only begins The tokens asm, __asm, and __asm__ are keywords at all language levels. C++ only ends

For detailed information about the syntax and semantics of inline asm statements, see Inline assembly statements.

Examples

The following code snippet shows an example of the GCC conventions for asm syntax in inline statements:

int a, b, c;
int main() {
    asm("add %0, %1, %2" : "=r"(a) : "r"(b), "r"(c) );
}

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