opencv-2.4.5 编译异常处理

抛出异常：

OpenCV-2.4.3/modules/features2d/src/freak.cpp:437: error: unable to find a register to spill in class 'GENERAL_REGS'

/cs/research/crest/projects1/ucacbbl/OpenCV-2.4.3/modules/features2d/src/freak.cpp:437: error: unable to find a register to spill in class GENERAL_REGS/cs/research/crest/projects1/ucacbbl/OpenCV-2.4.3/modules/features2d/src/freak.cpp:437: error: this is the insn:(insn:HI 1685 1684 1686 131 (parallel [            (set (subreg:DI (reg:V16QI 21 xmm0 [848]) 0)                (ior:DI (reg:DI 1 dx [832])                    (reg:DI 4 si [839])))            (clobber (reg:CC 17 flags))        ]) 315 {*iordi_1_rex64} (insn_list:REG_DEP_TRUE 1660 (insn_list:REG_DEP_TRUE 1659 (nil)))    (expr_list:REG_UNUSED (reg:CC 17 flags)        (expr_list:REG_UNUSED (reg:CC 17 flags)            (expr_list:REG_DEAD (reg:DI 4 si [839])                (expr_list:REG_DEAD (reg:DI 1 dx [832])                    (nil))))))

下文给出了解决方案：

http://www0.cs.ucl.ac.uk/staff/ucacbbl/opencv-2.4.3/

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This bug has been reported in stackoverflow.com.
  Being unable to find a register to spillappears to be a problem with some versions of gcc(bugzilla 35135).

http://stackoverflow.com/questions/13580485/error-in-making-opencv

的说明：

YOUR_BUILD_DIR/modules/features2d/CMakeFiles/opencv_features2d.dir/build.make

Search for freak.cpp. You find three blocks: Building CXX..., Preprocessing CXX..., and Compiling CX.... I just needed to change the Building part. The last line of that block looks like this:

.... YOUR_COMPILER $(CXX_DEFINES) $(CXX_FLAGS) ...

and if you check you find out that CXX_FLAGS has a -O3 in it. If you add -O0 after CXX_FLAGS it suppresses the O3. So your lines should look like this.

.... YOUR_COMPILER $(CXX_DEFINES) $(CXX_FLAGS) -O0 ...