None.
Controls the interpretation of 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.
-qasm syntax — C .-asm--+------------+-. | | .-gcc-. | | | '-=--+-----+-' | >>- -q--+-noasm---------------+--------------------------------><
-qasm syntax — C++ .-asm--+---------------+-. | | .-gcc----. | | | '-=--+-stdcpp-+-' | >>- -q--+-noasm------------------+-----------------------------><
-qasm=gcc
-qasm=gcc at all language levels except compat366 or strict98. -qnoasm=stdcpp when -qlanglvl=compat366 or -qlanglvl=strict98 is in effect.-qasm=gcc
stdcppSpecifying -qasm without a suboption is equivalent to specifying the default.
The token asm is not a C language
keyword. Therefore, at language levels stdc89 and stdc99, which
enforce strict compliance to the C89 and C99 standards, respectively, the
option -qkeyword=asm must also be specified to compile source that
generates assembly code. At all other language levels, the token asm is
treated as a keyword unless the option -qnokeyword=asm is in effect.
In C, the compiler-specific variants __asm and __asm__ are
keywords at all language levels and cannot be disabled.
The tokens asm, __asm,
and __asm__ are keywords at all language levels. Suboptions
of -qnokeyword=token can be used to disable each of these reserved
words individually.
For detailed information on the syntax and semantics of inline asm statements, see Inline assembly statements .
__IBM_GCC_ASM is predefined to 1 when asm is recognized
as a keyword and assembler code is generated; that is, at all language levels
except stdc89 | stdc99, or when -qkeyword=asm is in effect,
and when -qasm[=gcc] is in effect. It is predefined to 0 when asm is
recognized as a keyword but assembler code is not generated; that is, at all
language levels except stdc89 | stdc99, or when -qkeyword=asm is
in effect, and when -qnoasm is in effect. It is undefined when the stdc89
| stdc99 language level or -qnokeyword=asm is in effect.
__IBM_GCC_ASM is predefined to 1 when asm is recognized
as a keyword and assembler code is generated; that is, at all language levels except compat366 | strict98, and when -qasm[=gcc] is
in effect. It is predefined to 0 when asm is recognized as
a keyword but assembler code is not generated; that is, at all language levels except compat366|strict98, and when -qnoasm[=gcc] is
in effect. It is undefined when -qlanglvl=compat366
| strict98 or -qnoasm=stdcpp is in effect. __IBM_STDCPP_ASM
is predefined to 0 when -qlanglvl=compat366 | strict98 or -qnoasm=stdcpp is
in effect; otherwise it is undefined.int a, b, c;
int main() {
asm("add %0, %1, %2" : "=r"(a) : "r"(b), "r"(c) );
}