On 01 Jan 2014, at 23:32, Dimitry Andric <d...@freebsd.org> wrote: > I have almost completed the preliminary work to import clang 3.4 into > FreeBSD 11-CURRENT. The official clang 3.4 release has not yet been > announced, but I do not expect any more changes from upstream for now. > > However, since this version introduces a bunch of new warnings, and a > more strict options parser, I would like to call for some additional > testing by anyone who is interested. > > Specifically, the following: > * Building and installing world with non-standard settings in make.conf > and/or src.conf. > * Compiling your favorite set of ports. (I will request a ports > exp-run too). > * Fixing any kernel source with LINT that has not yet been fixed. (I > am still working on some of the things that are not in GENERIC.) > * Any other problems you may encounter with optimization, > incompatibilities, and so on. > > One thing to look out for, in particular with ports, is the more strict > option parsing introduced with clang 3.4. In earlier releases, unknown > or unsupported command line options were ignored, with just a "argument > unused during compilation" warning. From 3.4 onwards, such options will > result in a "unknown argument" error. > > Another important new issue is that clang 3.4 now outputs DWARF4 as > default format when using -g. Our ancient version of gdb in base does > not support this, so you must either install the gdb port, or build lldb > and use it (very experimental at this time!). > > Moreover, our CTF tools such as ctfconvert use a quite old version of > libdwarf in our base system, which also does not support DWARF4. So > ctfconvert processing of kernel objects doe not work at the moment.
This particular problem has now been fixed, thanks to Kai Wang. With his fix, the CTF tools now work correctly on a kernel compiled with clang 3.4, and DTrace works again. (However, see footnote [1].) I have rebased the patch against head r260893, and included Kai's fix. It is located here: http://www.andric.com/freebsd/clang/head-r260893-clang34-2.diff.xz SHA256 (head-r260893-clang34-2.diff.xz) = d9b5316d701f6b52d9563c025ce9fb81f6e5aa3c0881ee36a895d14cc8744014 To apply, unxz the file into a fresh head checkout, and run: svn patch head-r260893-clang34-2.diff -Dimitry [1] Note that there is still an open issue with the CTF tools: they are not yet built as part of the kernel-tools stage, so any fixes to them are only effective after installing world. See also: http://lists.freebsd.org/pipermail/freebsd-hackers/2014-January/044103.html
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