<div dir="ltr">Hi Kristof,<div><br></div><div>I know Jing (on this email) was working on gold tls relocations when I noticed this a while back. I'm pretty sure she implemented them (at least I can link now), but I'm not sure how well it's working. Can you confirm or elaborate more?</div><div><br></div><div>-eric</div><div><br><div class="gmail_quote">On Thu Jan 29 2015 at 11:25:23 AM Kristof Beyls <<a href="mailto:kristof.beyls@arm.com">kristof.beyls@arm.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-GB" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">For AArch64, clang produces relocations for TLS variables that ld.bfd or ld.gold can’t handle.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It seems that gcc, ld and gas only support the “</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">small memory model 16Mib TLS address model”,<br>and AFAIK, it may take a while for these to grow support for other address models.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I haven’t had time to come fully up to speed on this, but at the moment, the only workable<br>solution I can think of is to:<u></u><u></u></span></p><p><u></u><span style="font-size:11.0pt;font-family:Symbol;color:#1f497d"><span>·<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Not use thread_local variables in LLVM for the 3.6 release on AArch64, so that clang 3.6<br>can bootstrap itself on AArch64-linux.<u></u><u></u></span></p><p><u></u><span style="font-size:11.0pt;font-family:Symbol;color:#1f497d"><span>·<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">On trunk, let clang targeting AArch64-ELF systems only produce the relocations that ld supports.<br>At first sight that seems possible, but I’m not sure.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Does anyone have a better set of suggestions than the above?<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Kristof<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt"><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:llvm-commits-bounces@cs.uiuc.edu" target="_blank">llvm-commits-bounces@cs.uiuc.edu</a> [mailto:<a href="mailto:llvm-commits-bounces@cs.uiuc.edu" target="_blank">llvm-commits-bounces@cs.uiuc.edu</a>] <b>On Behalf Of </b>Chandler Carruth<br><b>Sent:</b> 29 January 2015 18:59<br><b>To:</b> Hans Wennborg<br><b>Cc:</b> Commit Messages and Patches for LLVM<br><b>Subject:</b> Re: [llvm] r227411 - [LPM] Clean up the use of TLS in pretty stack trace and disable it<u></u><u></u></span></p></div></div></div></div></div><div lang="EN-GB" link="blue" vlink="purple"><div><div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt"><p class="MsoNormal"><u></u> <u></u></p><p>I'm still waiting for some of the dust to settle with ppc and arm. I'll have a list before long and can help merge.<u></u><u></u></p><div><p class="MsoNormal">On Jan 29, 2015 9:50 AM, "Hans Wennborg" <<a href="mailto:hans@chromium.org" target="_blank">hans@chromium.org</a>> wrote:<u></u><u></u></p><p class="MsoNormal">On Wed, Jan 28, 2015 at 5:23 PM, Chandler Carruth <<a href="mailto:chandlerc@gmail.com" target="_blank">chandlerc@gmail.com</a>> wrote:<br>> Author: chandlerc<br>> Date: Wed Jan 28 19:23:04 2015<br>> New Revision: 227411<br>><br>> URL: <a href="http://llvm.org/viewvc/llvm-project?rev=227411&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=227411&view=rev</a><br>> Log:<br>> [LPM] Clean up the use of TLS in pretty stack trace and disable it<br>> entirely when threads are not enabled. This should allow anyone who<br>> needs to bootstrap or cope with a host loader without TLS support to<br>> limp along without threading support.<br><br>I assume we want this (and r227412) for the 3.6 branch. 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