What is gcc and g++
gcc: GNU C Compiler (C compiler) in GCC Note: GCC and gcc are two things
g++: is the GNU C++ Compiler in GCC (C++ compiler)
GCC: GNU Compiler Collection (GNU Compiler Collection), it can compile C, C++, JAV, Fortran, Pascal, Object-C, Ada and other languages.
The difference between gcc and g++
Both gcc and g++ can compile c language and c++
If it is a .c file, gcc will be compiled in the way of c language, and g++ will be compiled in the way of c++; if it is a .cpp file, both gcc and g++ will be compiled in the way of c++
gcc will only connect to the c library by default, not to the c++ library, and g++ will connect. When gcc compiles the cpp file, you must manually connect to the c++ library (command: gcc -o main main.cpp -lstdc++)
Use of gcc/g++
gcc is used in the same way as g++, here only gcc is taken as an example
1. Pre-compilation
gcc -E **.c #执行命令后生成**.i文件
Pre-compilation stage: processing pre-compilation instructions, delete comments, macro replacement
2. Compile
gcc -S **.i #执行命令后默认生成一个**.s文件
Compilation stage: grammar, lexical analysis, code optimization, summary symbols
3. Compilation
gcc -c **.s #执行命令后生成**.o文件，是可重定位的二进制文件
Assembly stage: Translate into binary, generate each segment, generate symbol table
4. Link
gcc **.o #默认生成一个a.out文件，a.out是可执行文件
Linking stage: merge each segment, symbol analysis, symbol relocation
The above command can add -o to specify the name of the generated file, o is the abbreviation of output, for example:
gcc **.o -o 自定义的文件名 #指定生成的可执行文件名称
The above process is summarized as follows
