http://sourceware.org/bugzilla/show_bug.cgi?id=12557
--- Comment #32 from H.J. Lu <hjl.tools at gmail dot com> 2011-09-02 13:58:28
UTC ---
(In reply to comment #31)
> Simple testcase
>
> double x;
> int main()
> {
> return x*x*x*x;
> }
>
> > gcc-4.6 -o t t.o -O -ffast-math -flto
> > gcc-4.6 -o t t.o -flto
> /tmp/ccIqK5i6.ltrans0.ltrans.o: In function `main':
> ccIqK5i6.ltrans0.o:(.text+0x19): undefined reference to `pow'
> collect2: ld returned 1 exit status
> > gcc-4.6 -o t t.o -flto -lm
> > gcc-4.6 -o t t.o -flto -Wl,--as-needed -lm
>
> which works for me with the 2.21.1 release.
This looks like a GCC bug to me. If GCC turns
x*x*x*x into pow, it should add -lm.
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