Reading Notes 3 GCC compiler steps

Reading Note 3 GCC compiler work steps-general Linux technology-Linux programming and kernel information, the following is a detailed description. After compiling the source code of the program, we use the GCC compiler to compile the written source code, although we only see a command, for example, we compile the Hello. c. When compiling with the GCC compiler, you only need one command: gcc-Wall Hello. c-o hello
However, in fact, it goes through four steps:
Step 1: pre-process the program with the source code suffixed with. I.
Its command is: cpp> *. I (the source code of C language after preprocessing is suffixed with. I, and the source code of C ++ is suffixed with. ii after preprocessing)
Step 2: Change the source code to the assembler program.
Command: gcc-S hello. I
Step 3: Compile the assembler code program into the target file, whose suffix is. o.
Command: as hello. s-o hello. o
Step 4: Compile the hello. o program into an executable program.
Command: gcc hello. o-o hello