[Dwarf-discuss] DWARF Issue 050808.2&body=Re: <ahref=http://dwarf.freestandards.org/ShowIssue.php

[Daniel Jacobowitz]

On Thu, Feb 23, 2006 at 11:08:00PM -0500, Daniel Berlin wrote:
> Proposal:
> 
> I propose we modify the definition of the DW_TAG_entry_point tag
> definition to state that it is also usable for specifying the main
> entry point to a program, not just fortran alternate entry points.
> 
> In order to determine which of the DW_TAG_entry_point is the single
>  main entry point to the program, a flag attribute DW_AT_is_main(or
>  something suitably named) should be added to the allowed attributes
>  for DW_TAG_entry_point.

If we need a new flag anyway, then why shouldn't it be a flag on
the DW_TAG_subprogram for main?  That seems to me like the clearest
choice.

"entry point" is an overloaded term already; this isn't necessarily the
program's entry point, but the high level language's starting point.
The actual entry point will be over in _start land.

> Alternatively, we could define it as the entry_point with
> DW_CC_program calling convention, and delete the text that says "The
> DW_CC_program value is intended to support Fortran main programs. It
> is not intended as a way of finding the entry address for the
> program."

This isn't appropriate because it would interfere with any other
DW_AT_calling_convention that applied to the main routine - for
instance, sh-elf-gcc with -mrenesas will mark main with
DW_CC_GNU_renesas_sh.

-- 
Daniel Jacobowitz
CodeSourcery