The situation with debugging on ptx is a little strange - it allows
.file and .loc directives for line numbers, and it provides a way to
define dwarf2 debug sections - but as far as I can tell, there's no way
of putting useful or accurate information into the latter. There's also
the slight problem that the data output directives used within those
sections differ from the ones used everywhere else in ptx code.
The following patch adds a variant of dwarf2 debugging that supports
just line numbers. I'll need to update the nvptx-as from my tools
package, since ptxas is picky and does not allow .file directives within
functions, so some more reordering of the assembly output is required.
How does this look? Testing currently in progress. An alternative would
be to make a PTX_DEBUGGING_OUTPUT macro and a corresponding file cut
down from dwarf2out.
Bernd
ptx-debug.diff
* config/nvptx/nvptx.c (nvptx_option_override): Don't override
debug options.
* config/nvptx/nvptx.h (DWARF2_LINENO_DEBUGGING_INFO): Define.
* config/nvptx/nvptx.h (DWARF2_DEBUGGING_INFO): Don't define.
* debug.h (dwarf2_lineno_debug_hooks): Declare.
* toplev.c (process_options): Add a case for it.
* dwarf2out.c (dwarf2_lineno_debug_hooks): New variable.
(dwarf2out_init): Skip most initializations if
DWARF2_LINENO_DEBUGGING_INFO, but set cur_line_info_table in
that case.
* defaults.h (PREFERRED_DEBUGGING_TYPE): Also use DWARF2_DEBUG
if DWARF2_LINENO_DEBUGGING_INFO.
* opts.c (set_debug_level): Likewise.