[kde-freebsd] Clang 3.2 causes a machine code error on qt4-webkit build

[RyōTa SimaMoto]

Clang 3.2 causes a machine code error on qt4-webkit build

Hi,
Compilation a C++ file of www/qt4-webkit fails with an error of "Bad
machine code".  This happens on the base llvm/clang (3.2 of 9-STABLE).
I do not know whether it is an bug or not, and where it comes from.

Two months ago, qt4-webkit-4.8.4 can be built successfully by Clang 3.1.
Now I tried it again with the upgraded version (3.2), it stops with a
fatal error message as following (wrapped snippet) during creation of a
object file from the source file
src/3rdparty/webkit/Source/WebCore/html/parser/HTMLScriptRunner.cpp:

  # Machine code for function
_ZN3WTF5DequeIN7WebCore13PendingScriptELj0EE14expand
  CapacityEv: Post SSA
  Frame Objects:
    fi#-1: size=4, align=4, fixed, at location [SP+4]

  BB#0: derived from LLVM BB %entry
          %vreg185<def> = MOVPC32r 0, %ESP<imp-use>; GR32:%vreg185
          %vreg77<def> = COPY %vreg185<kill>; GR32_NOSP:%vreg77 GR32:%vreg185
....Snip a long sequence of machine codes.....
....Full log (784 lines) is in the attached archive file....
  BB#61: derived from LLVM BB %unwind_resume
      Predecessors according to CFG: BB#17 BB#32 BB#54
          %vreg70<def> = COPY %vreg198<kill>; GR32:%vreg70,%vreg198
          ADJCALLSTACKDOWN32 4, %ESP<imp-def>, %EFLAGS<imp-def,dead>,
%ESP<imp-use>
          %vreg178<def> = COPY %ESP; GR32:%vreg178
          MOV32mr %vreg178<kill>, 1, %noreg, 0, %noreg, %vreg70<kill>; \
          mem:ST4[Stack] GR32:%vreg178,%vreg70
          %EBX<def> = COPY %vreg77<kill>; GR32_NOSP:%vreg77
          CALLpcrel32 <ga:@_Unwind_Resume>[TF=6], <regmask>, %ESP<imp-use>, \
          %EBX<imp-use,kill>, %ESP<imp-def>
          ADJCALLSTACKUP32 4, 0, %ESP<imp-def>, %EFLAGS<imp-def,dead>,
%ESP<imp-use>

  *** Bad machine code: Using an undefined physical register ***
  - function:    _ZN3WTF5DequeIN7WebCore13PendingScriptELj0EE14expandCapacityEv
  - basic block: BB#46 lpad7.i.i (0x2bc8a320)
  - instruction: %vreg157<def> = COPY %EAX; GR32:%vreg157
  - operand 1:   %EAX
  fatal error: error in backend: Found 1 machine code errors.

This can be reporduced in four steps:
  $ cd  /usr/ports/www/qt4-webkit
  $ make  configure
  $ cd  work/qt-everywhere-opensource-src-4.8.4/src/3rdparty/webkit/Source
  $ gmake  .obj/release-static/HTMLScriptRunner.o

// I did a workaround as borrowing the same object file from another build tree
// that was configured with qt4/mkspecs/freebsd-g++.
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