Question

安装gcc，make时产生如下错误：configure: error: no usable dependency style found

./configure进行完之后make，最后出现：
configure: error: in `/home/jeffrey/Downloads/gcc-build/gcc':
configure: WARNING: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.
checking for unordered_map... no
checking for tr1/unordered_map... no
checking for ext/hash_map... no
checking dependency style of g++... none
configure: error: no usable dependency style found
make[2]: *** [configure-stage1-gcc] Error 1
make[2]: Leaving directory `/home/jeffrey/Downloads/gcc-build'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/jeffrey/Downloads/gcc-build'
make: *** [all] Error 2

Answer 1

交叉编译的代码版本不对或者代码不全，或者是编译脚本执行的环境变量不对。很多情况可以导致这个现象。