On 18 Nov 2010, at 07:43, rixed@happyleptic.org wrote:

> Each time I need more debug information for the ocaml runtime itself
> (which hopefully is not often) I recompile Ocaml adding various "-g"
> and "-O0" here and there in some makefiles.
> 
> But I've noticed there are some special targets and rules, specifically in
> byterun/Makefile, that seams to be there for that very purpose (the suffix
> rules for .d.c extention). So I suppose there is a standard way to
> compile ocaml in debugging mode.
> 
> Do someone have some knowledge to share about this ?

The C files in byterun/ are compiled with and without debug/profiling, and the following files are created:
- libasmrun.a  (normal)
- libasmrunp.a (profiling)
- libasmrund.a (debug)

Only the normal and profiling ones are installed by default. You can grab the debug version from your ocaml build tree and link against it manually, with something like:

$ ocamlopt -output-obj -i foo.o foo.ml 
$ cc -lasmrund -lm -o foo foo.o

It'd be convenient to have a compiler option to select libasmrund without having to go via -output-obj (as "-p" does for profiling); the code for this is in asmcomp/asmlink.ml:runtime_lib().

Anil