Re: Adding new runtime library

[Basile STARYNKEVITCH <basile at starynkevitch dot net>]

Petros Panayi wrote:
> Hi,
> I try to write an optimization pass which at some point will make a 
> call to a  new runtime library.
> To achieve this I need to write my own runtime library i.e something 
> like libgomp but much simpler for now.
> I will like to know if there is a tutorial of any documentation on how 
> to do this?


With the new plugin mechanism in the trunk it should be even simpler 
(basically, link your libary into your plugin or extend your library to 
make it a GCC plugin).

However, even without plugins, it is not that hard.

The easy part is to change the gcc/Makefile.in - you might consider 
looking into the MELT branch 
http://gcc.gnu.org/viewcvs/branches/melt-branch/gcc/Makefile.in (which 
adds some additional libraries into cc1). You probably should add stuff 
into the BACKENDLIBS= make variable (not far from line 923 in 
gcc/Makefile.in in the trunk)

The less easy part (which you might consider optional) would be to hack 
the gcc/configure.ac file to test the availability of your additional 
library. You may also want to add a --with-XXX argument to configure... 
and be able to set your libraries header files and linkable archive 
paths (ie the -I or -L arguments needed).

The hardest part is indeed to write an optimisation pass :-)

Regards.

--
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
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