[PATCH] Initial DWARF64 support for .debug_line

[Eric Christopher]

That's really a shame. For dwarf3 it shouldn't generate 64-bit dwarf
unless the offsets in the file require 64-bits to represent. For
dwarf2 it's based on pointer size. Seems like a bug. Which version of
gcc is this?

-eric

On Mon, Oct 21, 2013 at 12:27 PM, Ed Maste <emaste at freebsd.org> wrote:
>
>   This patch addresses the output of GCC and gas on FreeBSD mips64
>   ```
>   # gcc --version
>   gcc (GCC) 4.2.1 20070831 patched [FreeBSD]
>   # as --version
>   GNU assembler 2.17.50 [FreeBSD] 2007-07-03
>   ```
>
>   This toolchain generally outputs dwarf2 but uses the 64-bit format from dwarf3.  This is the format that uses 0xffffffff in the initial length field, followed by a 64-bit length, and 64-bit offsets throughout.  Equivalent support already exists in DWARFDebugFrame.cpp.
>
>   My testcase binary is tiny; 64-bit is not necessary.  The (older) version of GCC and gas in FreeBSD output this format for some reason; I do not know if more recent versions still do.
>
>
>
>   for whatever reason the toolchain insists on
>
> http://llvm-reviews.chandlerc.com/D1988