On Mon, Nov 30, 2020 at 07:35:36PM +0000, Alexander Yermolovich via Gcc wrote: > I guess discussion is from perspective of having both flags > gdwarf32/gdwarf64. In which case it's a valid question on whether > they should imply -g like -gdwarf-#. But can this be viewed as only > a -gdwarf64 flag, that is a qualifier to other debug flags that > enable debug information? DWARF spec says that 32bit should be a > default, and 64bit should be used rarely (paraphrasing). So when > user enabled debug information the default expectation is that it > will be 32bit. There is no real need for a flag to say "I want debug > information, and I want it 32bit". On the other hand, 64bit DWARF > format must be enabled. So from users perspective it's "I want debug > information enabled for particular DWARF version and level, oh and I > want it to be 64bit".
GCC already support DWARF64 because some gcc architectures already default to DWARF64. They #define DWARF_OFFSET_SIZE PTR_SIZE. We currently don't have an option to use DWARF32 for those arches. -gdwarf32 would be that flag. And in general I think you want composable command line flags where a later flag can override an earlier flag. Cheers, Mark
