On Fri, 25 Sep 2020 13:43:40 +0200, Neal Gompa wrote:
> On Fri, Sep 25, 2020 at 7:26 AM Ryan <[email protected]> wrote:
> >
> > > == Benefit to Fedora ==
> > > * Better compatibility with existing debugging and tracing tools,
> > > primarily [https://lldb.llvm.org/ LLDB].
> >
> > Thanks for your work on this Ben and Jan, Just as an interested user, use
> > of the DWZ format significantly limits Swift development on Fedora, as it
> > is impossible to debug with LLDB when using system libraries.
Currently you can use my off-trunk patchset build:
dnf copr enable jankratochvil/lldb;dnf install
lldb-experimental;lldb-experimental
> But that's fixable since there's a patchset to make LLDB understand
> dwz, which was not submitted upstream for unstated reasons.
The reasons are stated in other mails, re-stating here:
* the support of DWZ is complicated for effective DWARF consumers like LLDB
* the same DWZ size reduction can be achieved just by removing dead DIEs
and -fdebug-types-section skeletons - not needing any DWZ nor DWZ support
in consumers at all
* the LLDB DWZ support is now scatterd across the LLDB DWARF codebase for
every DIE type so it will require continuous maintenance during LLDB
development from RH; Google+Apple will probably never use DWZ themselves.
* the LLDB DWZ support is currently implemented in LLDB DWARF/ but LLDB
is going to replace its DWARF code to clang's DWARF code which will then
require rewriting the LLDB DWZ code from scratch
Jan
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