https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63908 --- Comment #1 from leimaohui <leimaohui at cn dot fujitsu.com> --- I changed the gcc from 4.9.1 to 4.9.2 in yocto,and tested these cases. The results are the same. But when I changed the gcc to 4.8.2,the results of these cases are PASS.