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Re: [PATCH][gdb/symtab] Handle gas-generated stabs with -fPIE/-pie
- From: Tom Tromey <tom at tromey dot com>
- To: Tom de Vries <tdevries at suse dot de>
- Cc: gdb-patches at sourceware dot org
- Date: Wed, 09 Oct 2019 08:46:22 -0600
- Subject: Re: [PATCH][gdb/symtab] Handle gas-generated stabs with -fPIE/-pie
- References: <20190816155753.GA22229@delia>
>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:
Tom> The main3 function in the executable comes from dw2-ranges3.o, which is
Tom> generated like this (leaving out -fPIE -pie for clarity):
Tom> ...
Tom> $ gcc -S dw2-ranges3.c
Tom> $ gcc dw2-ranges3.s -o dw2-ranges3.o -gstabs
Tom> ...
Tom> So, main3 is described in stabs format, generated by gas.
Tom> 2019-08-16 Tom de Vries <tdevries@suse.de>
Tom> PR symtab/12497
Tom> * dbxread.c (process_one_symbol): Handle relocation of SLINE address
Tom> without preceding FUN/FNAME.
I don't know enough about stabs to say whether this change is correct or
whether it will cause problems in some other scenario. It modifies
"valu" - which isn't then reset, so perhaps it's used in some other way
later.
Do we need to support PIE + stabs? Can we just declare stabs as mostly
dead and ignore this instead? On the whole that would be my preference,
if it's possible, because in my view this more closely mirrors
reality... my understanding is that, last time anybody checked, stabs
were still used by a few programs in a typical distro (for some unknown
reason), but otherwise they are just totally obsolete.
Tom