Created by: wangkuiyi

I tried to build on Mac using the following command line to capture warnings:

tools/build.sh mac > /tmp/o 2>/tmp/e

And the following command counts 419 compile-time warnings generated by Clang/LLVM:

tr ' ' '\n' < /tmp/e | grep 'warning:' | wc -l

419 is simply too much I am afraid.

I looked into a few cases. Most of them reveal some serious problems. For example

• https://github.com/PaddlePaddle/paddle-mobile/blob/develop/src/common/type_define.h#L15 -- C++ directives shouldn't end with ;.

• This function https://github.com/PaddlePaddle/paddle-mobile/blob/develop/src/framework/data_layout.h#L30-L45 is defined as returning a value, but it doesn't contain the return statement at all.

• Here is another case that should have returned a value, but not: https://github.com/PaddlePaddle/paddle-mobile/blob/develop/src/platform/data_type.h#L25