[PATCH] D103131: support debug info for alias variable

[David Blaikie via Phabricator via cfe-commits]

dblaikie added a comment.

In D103131#2835004 <https://reviews.llvm.org/D103131#2835004>, @kamleshbhalui wrote:

> In D103131#2834744 <https://reviews.llvm.org/D103131#2834744>, @dblaikie wrote:
>
>> Huh, that surprises me - guess gdb favors checking the symbol first. I guess maybe it is using something that determines that that symbol comes from the file with debug info - because on a similar test case (one file without debug info, defining some global variable `i`, another file with debug info with a `using ns::i` in the global scope - printing `i` when stepping into the second file correctly prints the `using` based alias value, but stepping into the file without debug info and printing `i` complains about not knowing the type of that `i`)
>>
>> How's lldb go?
>
> lldb seems to be printing value , but I worry about type.
>
>   * thread #1, name = 'a.out', stop reason = breakpoint 1.1
>       frame #0: 0x0000000000400484 a.out`main at test.c:3:12
>      1    int oldname = 1;
>      2    extern int newname __attribute__((alias("oldname")));
>   -> 3    int main(){}
>   (lldb) p oldname
>   (int) $0 = 1
>   (lldb) p newname
>   (void *) $1 = 0x0000000000000001

Yeah, that looks a bit suspicious - perhaps try testing it with the alias of some other type (like float) and see if it renders correctly?


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