[Bug c/8108] Problem in the code generator for C and the linker is extremelly slow

[manuel dot serrano at sophia dot inria dot fr]

------- Additional Comments From manuel dot serrano at sophia dot inria dot fr  2004-03-30 13:41 -------
Subject: Re:  Problem in the code generator for C and the linker is extremelly slow

> No, when we start building large systems with lots of automatically 
> generated code, we run into this problem quite relyably, not only for 
> one system. Sticking with an old gcc is currecntly also the only option 
> for us :-(.
I see, we are having the very same troubles and very same solutions :-(

> >The gcc3.2's option "-fno-merge-constants" gets rid of the problem. 
> >Unfortunately it has no effect with gcc3.3 (well, I have not tested recent
> >versions, may be this has improved now).
> >  
> >
> Unfortunately, this is not really the case for us. We do not have that 
> many string constants in our code, so setting this option does not 
> change our linking times at all. What seems to be the killer for me is 
> the debug information. Currently there is no option to treat debug info 
> as non-mergable. I have already seen a gcc patch floating around that 
> achieves this, but I don't think that it is considered for inclusion 
> into the main gcc development, or even has been submitted.
Same things for me. The real pain is when I try to compile in C debug mode...

> There is a version of the binutils in the making (2.15) which will solve 
> the problem from the point of view of ld. They have a much improved 
> string merging algorithm that reduces link times for me from ~3000s to 
> ~40s. This is still worse than the original ~7s (for gcc-2.95.x 
> generated objects) but it is 2 orders of magnitudes down.
I would by, at once, a 2x slowdown ;-)



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=8108