GCC implements Multi-file compilation, static library, and dynamic library

Source: Internet
Author: User
Code 1
// Add. Hint add (int A, int B );

// Add. CINT add (int A, int B) {return a + B ;}

// Main. c
# Include <stdio. h> # include "Add. H"
Void main () {printf ("3 + 2 = % d \ n", add (3 + 2 ));}
Multi-file compilation 1 generate. o file command: gcc-C add. C main. c generate: Add. O, Main. o
2 generate the executable file command: gcc-O main Add. O main. O generate: Main
3 run the command:./main output: 3 + 2 = 5
Static Library 1 generate the. o file command: gcc-C add. c generate: Add. o
2 generate libxxx. A command: Ar RCS libadd. A Add. O generate: libadd.
3. Generate the executable file command: gcc-O main. C-static-L.-Ladd: Main
4 run the command:./main output: 3 + 2 = 5
Three dynamic library 1 generate the. o file command: gcc-C add. c generate: Add. o
2 generate libxxx. So command: gcc-shared-FPIC-O libadd. So add. O generate: libadd. So
3. Dynamic library Path Method 1: copy the file to the directory/usr/lib and run the following command: MV libadd. So/usr/lib.
Method 2: Set LD_LIBRARY_PATH to the current directory. Command: Export LD_LIBRARY_PATH =$ (PWD)
4. Generate the executable file command: gcc-O main. C-L.-Ladd: Main
# If Step 4 is not displayed, the following error occurs: libadd. So cannot be found.
5 run the command:./main output: 3 + 2 = 5

4. makefile # MF: mult File
# LIBA: liaxxx.
# Libso: libxxx. So

Run: Main
./Main
MFO: Add. C main. c
Gcc-C add. C main. c
MFE: MFO
Gcc-O main Add. O main. o
LiBo: Add. c
Gcc-C add. c
LIBA: Libo
Ar RCS libadd. A Add. o
Libae: LIBA
Gcc-O main. C-static-L.-Ladd
Libso: Libo
Gcc-shared-FPIC-O libadd. So add. o
Libsoe: libso
Export LD_LIBRARY_PATH = $ (PWD)
Gcc-O main. C-L.-Ladd



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