[cfe-dev] Problems with LLDB for Ubuntu 12.04

[Richard Smith]

On Mon Jan 06 2014 at 1:50:44 PM, Fletcher, John P <j.p.fletcher at aston.ac.uk>
wrote:

> I note from the release notes for LLVM 3.4 that gcc 4.6 is not on the
> supported compiler list for this release,


By "this release", do you mean the (~6 months away) 3.5 release? GCC 4.6 is
supported for Clang 3.4 (the current stable release, released earlier
today).

and won't be for future releases.  I have explained below that at the
> moment with the 3.5 svn release I cannot get LLDB to compile using clang
> and libc++ and it will not compile with gcc 4.6. I asked two questions
> which have had so far no response:
>
>
> a)      What is the last version of LLDB which will build with gcc 4.6?
>
> b)      Will that be useful for working with more recent clang 3.5 with
> c++1y?
>
> I note from the release of 3.4 there is a binary for llvm+clang for Ubuntu
> 12.04.  It would be very helpful if there could also be a binary release of
> LLDB for the same system as it is not possible at the moment to build LLDB
> on 12.04 without installing extra compilers.
>
> Ubuntu 12.04 is intended by Ubuntu to be a 'Long Term Support' version, so
> it would be helpful if LLDB/LLVM would go along with the spirit of that and
> fill in the gaps in the tools.
>
> Best wishes
>
> John Fletcher
>
>
> ________________________________
> From: Fletcher, John P
> Sent: 02 January 2014 14:13
> To: lldb-dev at cs.uiuc.edu
> Subject: FW: Problems with LLDB for Ubuntu 12.04
>
> Here is a message which I posted to cfe-users, and I am reposting it here
> as probably the right place for it.
>
> This is from something else which I posted on cfe-dev:
>
>
> The killer problem is that liblldb.so will not link, which is caused by
> the incompatibility of the std::string definitions.  I could not understand
> why it would not link until I read this:
>
>
>
> http://stackoverflow.com/questions/12542971/using-
> libstdc-compiled-libraries-with-clang-stdlib-libc
>
>
>
> It looks to me as though the current LLDB is not buildable on Ubuntu 12.04
> without adding a newer version of libstdc++ as it will not build with
> libc++ on 12.04
>
>
>
> This would be solved if it had an option not to use map.emplace so that it
> would work with gcc 4.6
>
>
> I have tried with versions of libc++ built with either libc++abi  or
> libcxxrt in case that made a difference.  It did not.
>
> It would be helpful to know
>
>
> a)      What is the last version of LLDB which will build with gcc 4.6?
>
> b)      Will that be useful for working with more recent clang 3.5 with
> c++1y?
>
> Thank you
>
> John Fletcher
>
>
>
> From: Fletcher, John P
> Sent: 01 January 2014 11:56
> To: cfe-users at cs.uiuc.edu
> Subject: Problems with LLDB for Ubuntu 12.04
>
> I have spent a long time over the last few days doing the 'easy' thing of
> installing LLDB on my computer system.
>
> I had intended to use the LLVM/Clang 3.4 release which was due out on 23rd
> December 2013. Although that date has now gone from the web site 3.4 the
> release has not appeared.  So I have started to work with the 3.5 svn trunk
> codes.
>
> I use Ubuntu 12.04 which Ubuntu regard as a release with long term
> stability, which suits me as mainly a user rather than a developer of
> compilers etc.  That uses gcc 4.6, which does not support c++1y much at
> all.  Hence my use of clang, with much enthusiasm, as I want to use c++1y.
>
> The current release of LLDB will not build with gcc 4.6 because of the use
> of features which are in the new standard but not supported in gcc 4.6
> version of libstdc++.
>
> It will also not build with the current clang/libc++ combination either,
> as it all compiles but will not link the main library because it is trying
> to use both libc++ and libstdc++ string at the same time which is
> impossible.
>
> So what Ubuntu regard as a long term stable system is not supported by
> LLDB.
>
> This is reflected in discussion on lldb-dev but not in the build
> instructions on the web site.  There has been some discussion about the
> need to install a later gcc such as 4.8.
>
> I think it would be very helpful if the different parts of LLVM would be
> clear about which compilers are supported.
>
> Thank you
>
> John Fletcher
>
>
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