Clean up pretty printers [18/n]

[Jan Hubicka]

> On Mon, Aug 26, 2013 at 9:00 AM, Jan Hubicka <hubicka@ucw.cz> wrote:
> >> On Mon, Aug 26, 2013 at 7:24 AM, Jan Hubicka <hubicka@ucw.cz> wrote:
> >> > Hi,
> >> > it seems to be couple weeks I am not able to compile big ltrans unit with -fdump-tree-all
> >> > because the compiler eventually runs out of memory.  I think it is one of your patches
> >> > introducing serious memory leak.  Can you, please, take a look on this? It makes my life
> >> > harder - it is not fun to wait for 15 minutes for a dump and then see compiler to ICE...
> >> >
> >> > Thanks,
> >> > Honza
> >>
> >>
> >> The existing pretty printers have always had memory leaks, and
> >> part of the work is to reduce that in fact :-(   For example, instead
> >> of printing directly to the output buffer, many of them construct
> >> a string for a given formatter, then send that string to the stream,
> >> and that string may or may not be reclaimed.  Please give me
> >> actionable instructions so I can reproduce your situation.
> >
> > I think it should be easiert to build with bootstrap-lto and then add -fdump-tree-all into
> > the final link command line options.
> 
> modify ALL_LINKERFLAGS or BUILD_LINKERFLAGS?

configure --with-build-config=bootstrap-lto . You need plugin enabled buinutils for that.
I think there however should be a lot easier way to reproduce it by just dropping some really
large source file.  Here LTO only runs the backend on very many functions.

Honza