Compiling from Visual Studio 2012 to g++?

Question

I have a c++ program compiled in Visual Studio 2012. It contains the boost library. Now, I want to compile this using the g++ compiler. What are the things I must be aware of? Things that will most likely silently break my code in random places.

For example I was always assuming long is 4 bytes buy g++ treats this as 8 bytes. For this alone I need some changes.

And what version of gcc to use, 4.7.3, 4.6.4 or 4.8.2?

Answer 1

如果你在没有使用特定库的情况下编写有效且优秀的C ++代码，那么你应该什么都不知道。

Answer 2

Some of the things that you have to keep in mind. This list is not comprehensive but are those things that are on top of my mind when I read your question.

1. pragma once : When using g++, you should gaurd file inclusion by using #ifndef, #define and #endif guards.

2. Header inclusion : VS 2012 is very lenient and does not make a fuss of forward or backward slash while including headers. g++ will be strict in enforcing them.

3. If you are using Win32 threads / mutex, it is best to shift to std::thread. If you are using boost for threads, you are OK.

The version of gcc you can use and get away with depends on your usage of C++11 features. gcc was always ahead of Microsoft in implementing C++11 features and you should be OK with an older version of gcc too. I cannot answer this question unless I understand what c++11 features you are using in your code. It is safe to say that the more recent version of gcc will surely support what is available in Vs 2012.