Re: Comments in assember output

> I don't think there is any simple way to do this without using the -g
> option.
>
> Note that the -g option does not affect code generation in any way.
> You can use -O3 with or without -g, and you will get the same code.
>

Will the -g -O3 option truly give me code that executed at the same speed
as -O3? I was not aware of that. In that case -g is fine. But even with -g I
am not getting the result I want. I guess it is time for a specific example:
Lets say I have the fillowing code in test.cxx

float func(float a, float b)
{
        return a * b;
}

and try to generate the assembly with

g++ -g -O3 -Wa,-addhls test.cxx -S

I would get the following (This output is truncated, I left out all the debug
symbols at the end):

# ... bla bla bla...
.LFB2:
        .file 1 "test.cxx"
        .loc 1 3 0
.LVL0:
        pushl %ebp
.LCFI0:
        movl %esp, %ebp
.LCFI1:
        .loc 1 3 0
        flds 12(%ebp)
.LBB2:
        .loc 1 4 0
        fmuls 8(%ebp)
.LBE2:
        .loc 1 5 0
        leave
        ret
.LFE2:
        .size _Z4funcff, .-_Z4funcff
# ... etc ...


And I dont see any comments containing my c++ source lines. I would have
expected something like:

# ... bla bla bla...
.LFB2:
        .file 1 "test.cxx"
        .loc 1 3 0
#                     float func(float a, float b)
#                     {
.LVL0:
        pushl %ebp
#                              return a * b;
.LCFI0:
        movl %esp, %ebp
.LCFI1:
        .loc 1 3 0
        flds 12(%ebp)
.LBB2:
        .loc 1 4 0
        fmuls 8(%ebp)
.LBE2:
        .loc 1 5 0
        leave
        ret
#                       }
.LFE2:
        .size _Z4funcff, .-_Z4funcff
# ... etc ...


Any ideas how to get his kind of output?

--

Artur Szostak

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