GCC program compilation and gcc Compilation

GCC program compilation and gcc Compilation
1. Introduction

GCC program compilation can be divided into four stages:

 
 


  
  
Preprocessing (Pre-Preocessing)

  
  
Compile (Compiling)

  
  
Assembly)

  
  
Link (Linking)

 
 

2. Basic GCC usage

Basic usage:Gcc [options] [filename]
Common options selection and usage are described as follows:

 
 


  
  
-O output_filename: determines that the name of the production executable file is output_filename. If this option is not available, the compiler outputs the executable file a. out by default;

  
  
-C: only compiled, not connected to executable files, default outputFile Name. oFile;

  
  
-G: generate the symbolic information required by the debugging tool. To use the GDB debugging program, you must add this option;

  
  
-O: Use the compilation optimization level to optimize program compilation;

  
  
-O2: The program is optimized using the compilation sector with Level 2;

  
  
-Idirname: add the directory specified by dirname to the header file list;

  
  
-Ldirname: adds the directory specified by dirname to the library file list;

  
  
-Lname: when linking, load the function library named "libname.;

  
  
-Static: The program is compiled in the form of a static Link Library. If this option is not added, the dynamic link library is used by default. The files produced by the static Link Library are large;

  
  
-Wall: generates all warning information;

  
  
-W: no warning information is generated;

  
  
-DMACRO: equivalent# DefineDefinition macro.