Common gcc commands

1. Common linux gcc commands

No options

Gcc test. c

Prepare, compile, and link test. c to form an executable file.

-O file name
Compile as the target code
-C
Compile only the source file without link, for example, gcc-c test. s. You can output the Assembly file as a test. o file.

-S

Generate assembly code

-E

Program preprocessing is output as a. I file, for example: gcc-E test. c-o test. I

Gcc file name 1 file name 2-o file name

Compilation of multiple program files, for example, gcctest1.c test2.c-o test

Compile multiple program files. You can also use

Gcc-c test1.c

Gcc-c test2.c

Gcc-o test1.o-o test2.otest

-D foo = X
Define the pre-processing macro FOO in the command line, whose value is X
-I dir
Add a header file search path
-L dir
Add library file search path

-Static
Link Static Library

-Library

Link Library File
-G
Include standard debugging information in executable programs
-Ggdb
Generate debugging information for gnu identification only
-O number
Specify the code optimization level as N, 0 <= N <= 3. -O1 tells the compiler to perform the first-level optimization. Generally, increasing the optimization level will make the program run faster, but the Compilation Time will be longer, making it more difficult to debug the program with a debugging tool, using a higher level of optimization Code makes the generated machine code hard to understand.
-Ansi
Supports ANSI/iso c standard syntax
-Pedantic
All warnings listed in ANSI/iso c are allowed
-Pedantic-errors
All errors listed in ANSI/iso c standards allowed
-Traditional
Supports K & r c syntax;
-W
Disable all warnings
-Wall
Allow all useful warnings provided by gcc
-Werror
Converts all warnings to errors and terminates the compilation process when a warning occurs.

2. The file name suffix stipulated by gcc:

. C language source code file

. A library file consisting of the target file

. Cc C ++ source code file

Files produced by. I preprocessing

C ++ source code files produced by. ii preprocessing

. O target file

. S assembly code file

3. Compile the C ++ program in ubuntu

First install g ++ in ubuntu and run the sudo apt-get sudo g ++ command.

Then write the program source code and save it as a. cpp file. Use the command gcc-o target file name to generate the. out file and then run the program in the. out file. For example:

# Include <iostream>

Using namespace std;

Int main ()

{

Cout <"hello world" <endl;

Return 0;

}

Save as hello. cpp, and then use g ++-o hello. cpp,

Then execute./hello to output hello, world