130507 2014-03-20 06:15:29 -0700 webkitgtk 2.3.92 fails to build on Debian/armhf: error: unable to find a register to spill in class 'LO_REGS' 2014-04-04 04:06:15 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) PC Linux NEW P2 Normal --- 1 iain.lane webkit-unassigned berto gustavo zan oldest_to_newest 992488 0 iain.lane 2014-03-20 06:15:29 -0700 On Debian armhf (Thumb 2: https://wiki.debian.org/ArmHardFloatPort), webkitgtk as of 2.3.92 fails to build like this: ../Source/JavaScriptCore/jit/JITArithmetic32_64.cpp: In member function 'void JSC::JIT::emit_op_add(JSC::Instruction*)': ../Source/JavaScriptCore/jit/JITArithmetic32_64.cpp:526:1: error: unable to find a register to spill in class 'LO_REGS' } ^ ../Source/JavaScriptCore/jit/JITArithmetic32_64.cpp:526:1: error: this is the insn: (insn 187 186 188 20 (parallel [ (set (reg:SI 3 r3) (ior:SI (eq:SI (reg/v:SI 112 [ op ]) (reg/v:SI 110 [ dst ])) (eq:SI (reg/v:SI 111 [ op ]) (reg/v:SI 110 [ dst ])))) (clobber (reg:CC 100 cc)) ]) ../Source/JavaScriptCore/jit/JITArithmetic32_64.cpp:514 284 {*ior_scc_scc} (expr_list:REG_UNUSED (reg:CC 100 cc) (nil))) ../Source/JavaScriptCore/jit/JITArithmetic32_64.cpp:526: confused by earlier errors, bailing out Full log is https://buildd.debian.org/status/fetch.php?pkg=webkitgtk&arch=armhf&ver=2.3.92-1&stamp=1395146394 992672 1 berto 2014-03-20 13:01:29 -0700 I saw this but I didn't have the time to look into it yet, thanks for reporting! 993145 2 iain.lane 2014-03-21 09:35:56 -0700 I spoke to the GCC maintainer in Debian & Ubuntu and he believes it's a bug in gcc-4.8 that webkit exposed by adding -fno-tree-dce in .92. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60617 993746 3 berto 2014-03-24 02:18:48 -0700 (In reply to comment #2) > I spoke to the GCC maintainer in Debian & Ubuntu and he believes > it's a bug in gcc-4.8 that webkit exposed by adding -fno-tree-dce in > .92. > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60617 I'm not sure why we need -fno-tree-dce anyway. Žan? 993934 4 zan 2014-03-24 13:07:50 -0700 (In reply to comment #3) > (In reply to comment #2) > > I spoke to the GCC maintainer in Debian & Ubuntu and he believes > > it's a bug in gcc-4.8 that webkit exposed by adding -fno-tree-dce in > > .92. > > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60617 > > I'm not sure why we need -fno-tree-dce anyway. Žan? This avoids an apparent GCC 4.8 bug which was crashing tests after the jsCStack branch was merged. The optimization was disabled in bug #127909. 995804 5 berto 2014-03-31 03:19:25 -0700 Still failing as of 2.4.0 996147 6 zan 2014-03-31 23:33:56 -0700 How many JSC tests fail on the armhf build if the -fno-tree-dce flag is removed? 996660 7 berto 2014-04-02 04:08:00 -0700 (In reply to comment #6) > How many JSC tests fail on the armhf build if the -fno-tree-dce flag is removed? I cannot give it a try right now but I'll try to do it as soon as I have the time. 997537 8 berto 2014-04-04 04:06:15 -0700 The armhf machine I'm trying on is very slow, but at least JSC seems to build fine. I'd say let's disable -fno-tree-dce in Debian for the time being until the GCC bug is solved.