> Firstly, aren't discriminators introduced in DWARF 4? Little more > digging shows that the following fix is missing in 4.6.1 release. It > breaks the current dwarf2 parsers/readers. I think it is worth filing > a bug. > > http://gcc.gnu.org/viewcvs/trunk/gcc/dwarf2out.c?r1=171846&r2=171852&diff_f >ormat=h
Yes, this is a real nuisance for some DWARF consumers. You need to ask a RM about backporting the fix. > Secondly, in gcc4.5.1, the directive (.loc) is not emitted and still > we are able to map line numbers to address. Please help me understand > how introducing .loc directive affects debug_line format in gcc 4.6.1. .loc directives are processed by the assembler, which then builds .debug_line. -- Eric Botcazou
