References: <201008121844.58918.jobnoorman@xxxxxxxxx> <201008131125.58963.jobnoorman@xxxxxxxxx> <4C651129.6060309@xxxxxxxxxx> <201008131138.37230.jobnoorman@xxxxxxxxx>
>On 08/13/2010 10:38 AM, Job Noorman wrote:
>> On Friday 13 August 2010 11:32:25 you wrote:
>>> On 08/13/2010 10:25 AM, Job Noorman wrote:
>>>> //file main.cpp
>>>> void func() {}
>>>>
>>>> int main()
>>>> {
>>>>
>>>> //this works but GCC generates an indirect call:
>>>> // movl $_Z4funcv, %eax
>>>> // call *%eax
>>>> asm("call *%0" : : "r"(func));
>>>>
>>>> //this is what I conceptually want to do but doesn't work because
>>>> //GCC generates
>>>> // call $_Z4funcv
>>>> //which gives an error from the assembler:
>>>> // main.cpp: Assembler messages:
>>>> // main.cpp:20: Error: suffix or operands invalid for `call'
>>>> //I would like to find a way to make GCC generate the following:
>>>> // call _Z4funcv
>>>> //(note there is no "$")
>>>> asm("call %0" : : "i"(func));
>>>>
>>>> }
>>>
>>> asm("call %P0" : : "i"(func));
>
>> Wow thanks a lot!
>> Is this feature documented somewhere? I've been looking through the manuals
>> but haven't found it.
>
>I have no idea. I just looked in the gcc source code.
>
>Andrew.
This does not seem to work in a Linux invironment when using the -fpic option (which makes sense I think). Is there any way to do this when -fpic is used?? Thanks.
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