编译opencv-2.4.12版本记录
1、 math cannot parse the expression: "*100 + ": syntax error, unexpected exp_TIMES, expecting exp_PLU
change "dumpversion" to "dumpfullversion"
2、the compiler can assume that the address of 'annotate_img' will never be NULL [-Werror=address]
delete "-Werror=address" in flag.cmake
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