Quoting Ian Lance Taylor <ian@xxxxxxxxxxxxxxxxx>:
> y2bismil@xxxxxxxxxxxxxxxxxxxx writes:
>
> > I know this is a long shot, but is there a way to "override" memset,
> strcpy, and
> > other c string functions without renaming their calls?
> >
> > Basically at link time, I want to use my own version of memset, strcpy and
> a
> > select few others.
>
> Which function calls do you want to override?
>
> If you want to override calls made in your own code, just provide your
> own versions of memset, strcpy, etc. They will be called in
> preference to the one in libc.
>
> If you want to override the calls in libc, then it depends upon what
> host you are using. In some cases you can again simply provide the
> function yourself. But in some cases the library never calls memset,
> etc., it instead calls internal versions to avoid overriding
> problems. So, it depends.
>
> > BTW are there any known problems with -minline-all-stringops. I tried that
> and
> > for some reason, I was still getting a function call for memset.
>
> That suggests that you are using an i386 target. Please always
> mention what you are using.
>
> -minline-all-stringops doesn't necessarily eliminate every call to the
> string operations, although it tries. There are a number of possible
> cases in which gcc will still emit calls to memset. If you provide a
> small test case, somebody can probably tell you whether it is a bug or
> a case which is not handled.
>
> Ian
>
Thanks Ian,
So just to confirm, if in a file say:
"myreplacements.c", I have
*************************************************
void * memset(void * s,char c,size_t count)
{
/*my code*/
}
*************************************************
Then any call to memset WITHIN MY CODE will first be linked with this memset
rather than the one in glibc? This occus even if the calling file has included
<string.h>? Do I have to include a header of my own, say "myreplacements.h" in
each file (i.e. i could modify the make command to use -include myreplacements.h?
Thanks,
Yamin
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