error: impossible constraint in `asm' 解决办法_impossible constraint in ‘asm’

在arm-linux系统上编译opencv1.0时出现如下错误：

cvcap_v4l.cpp: In function `void mainloop_v4l2(CvCaptureCAM_V4L*)':
cvcap_v4l.cpp:1172: error: impossible constraint in `asm'
{standard input}: Assembler messages:
{standard input}:1488: Error: bad instruction `btsl r3,[r1,#-128]'
make[2]: *** [cvcap_v4l.lo] 错误 1
make[2]: Leaving directory `/usr/local/opencv1.0.0/opencv-1.0.0/otherlibs/highgui'
make[1]: *** [install-recursive] 错误 1
make[1]: Leaving directory `/usr/local/opencv1.0.0/opencv-1.0.0/otherlibs'
make: *** [install-recursive] 错误 1

此时只要在./config命令中添加：--without-v4l ，make clean, 重新make即可。