g++的命令

GNU

GNU编译器集合（GCC）是由GNU项目生产的优化编译器，支持各种编程语言、硬件架构和操作系统。自由软件基金会（FSF）根据GNU通用公共许可证（GNUGPL）将GCC作为自由软件分发。

GCC（特别是其中的C语言编译器）也常被认为是跨平台编译器的事实标准。

What is the difference between g++ and gcc?

gcc and g++ are compiler-drivers of the GNU Compiler Collection (which was once upon a time just the GNU C Compiler).

• gcc: GNU C Compiler
• g++: GNU C++ Compiler

The main differences:

1. gcc will compile: *.c\*.cpp files as C and C++ respectively.
2. g++ will compile: *.c\*.cpp files but they will all be treated as C++ files.
3. Also if you use g++ to link the object files it automatically links in the std C++ libraries (gcc does not do this).
4. gcc compiling C files has fewer predefined macros.
5. gcc compiling *.cpp and g++ compiling *.c\*.cpp files has a few extra macros.

Extra Macros when compiling *.cpp files:

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#define __GXX_WEAK__ 1
#define __cplusplus 1
#define __DEPRECATED 1
#define __GNUG__ 4
#define __EXCEPTIONS 1
#define __private_extern__ extern