On Tue, 16 Dec 2014 10:47:30 +0000
Nicholas Clifton <ni...@redhat.com> wrote:
> Hi Eric,
>
> > there are still some bugs, for example if linking a lot of code
> > together the compiler suddenly issues a lot of
> >
> >> warning: visibility attribute not supported in this configuration;
> >> ignored [-Wattributes]
> >
> > warnings for no apparent reason in random places in the code.
>
> That sounds interesting. Could you send me a small testcase to
> reproduce the problem ? Or better yet file a bug report (with the
> FSF or TI) including the testcase, and then I can look into it.
>
> Cheers
> Nick
>
>
The only test case I have so far that reproduces it contains a lot of
proprietary code that I unfortunately cannot share here. I yet have to
create an artificial simplified test case.
The problem is, I was only able to reproduce it when linking together
a relatively large code base with lots of functions, and only when many
of these functions were actually being used.
Any attempt to simplify the test case by reducing code, or even
just calls to that code - which was the first thing I tried, made the
error "magically" disappear. That happened regardless of which function
calls were eliminated.
That way I couldn't pinpoint any specific code as the culprit, it
rather looks like the error only appears when a certain code complexity
is surpassed. I'd guess maybe because it overwhelms the linker garbage
collector or makes it switch optimization schemes internally or
something. It's hard to tell without more detailed knowledge of whats
going on linker-internally.
Assume the following program was triggering the bug (with function1
and 2 implemented in previously compiled and now to be linked in object
files)
void function1(void);
void function2(void);
int main() {
function1();
function2();
exit 0;
}
then these two simplified programs both did not trigger it:
int main() {
function1();
/* function2(); */
exit 0;
}
int main() {
/* function1(); */
function2();
exit 0;
}
--
Eric Price
TTI GmbH - TGU Smartmote
Pfaffenwaldring 4
D-70569 Stuttgart
Tel.: +49 0711 - 6856 5369
Fax.: +49 0711 - 6856 6818
E-mail: pr...@smartmote.de
Homepage: http://www.smartmote.de
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