On 09/06/13 03:53, Roman Divacky wrote:
On Thu, Sep 05, 2013 at 11:00:24PM +0000, Nathan Whitehorn wrote:
Author: nwhitehorn
Date: Thu Sep 5 23:00:24 2013
New Revision: 255273
URL: http://svnweb.freebsd.org/changeset/base/255273
Log:
Align stacks of kernel threads correctly at 16-byte boundaries rather than
making sure they are all misaligned at +8 bytes. This fixes clang builds
of powerpc64 kernels (aside from a required increase in KSTACK_PAGES which
will come later).
This commit from FreeBSD/powerpc64 with a clang-built kernel.
The increased KSTACK_PAGES is needed because the kernel you're using is built
with O0. I suppose O2 kernel will be fine. Needs to be tested.
Anyway, this is a great step forward and I believe PowerPC64 is basically ready
to be compiled with clang instead of gcc :)
Congrats!
Roman
I think you are the one who did all the hard work here, so thanks a
great deal. As an update for the list, this is where we currently are
for clang/ppc64:
1) We need to update the in-tree clang to a more recent version
2) Kernel and world both appear to work perfectly
3) We need a few minor updates to clang so that we can enable
-integrated-as by default, which is important to work around some
limitations of our ancient binutils (-g will break as otherwise)
4) KDB currently relies on a deprecated scheme of PPC64 ELF symbol
declarations to provide stack traces. We either need to add it to clang
or fix KDB to give meaningful output on panics with the default symbol
emission strategy.
5) clang/ppc32 is not as advanced and we need to figure out a way to
build /usr/lib32.
This is a pretty short list of TODOs. Once (1) and (3) are done, we will
start encouraging testing of WITH_CLANG_IS_CC (with WITHOUT_LIB32 due to
#5). If we can figure out a solution to #5, and nothing untoward happens
in testing, WITH_CLANG_IS_CC will become the default on ppc64.
Thanks in particular to Roman for working very hard for a very long time
to make this happen.
-Nathan
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
