Simple g++ and GDB debugging

1. The build process

step	effect	command
Preprocessing	Macro expansion , The header file contains	g++ -E test.cpp -o test.i
compile	Generate assembly statement code	g++ -S test.i -o test.s
assembly	Generate machine language code	g++ -c test.s -o test.o
link	Generate executable files	g++ test.o -o test.exe

2. g++ Important parameter

Parameters	effect	command
-g	Can be gdb debugging	g++ -g test.cpp -o test.exe
-O[n]	Code optimization	g++ -O2 test.cpp -o test.exe
-l	Specify dynamic and static library files	g++ -lglog test.cpp -o test.exe
-L	Specify the dynamic and static library file path	g++ -L/home/lzg -lmytest test.cpp -o test.exe
-Wall	Print alarm information	g++ -Wall test.cpp -o test.exe
-w	Turn off the alarm message	g++ -w test.cpp -o test.exe
-std=c++11	Specify compilation criteria	g++ -std=c++11 test.cpp -o test.exe
-D	Specify macro name	g++ -DV5PLAT test.cpp -o test.exe
-I	Appoint include File path	g++ -DV5PLAT test.cpp -o test.exe

3、 Generate library files

3.1 Static library

1.  Generate binaries 
   g++ -c swap.cpp -o swap.o -I../include
2.  Archive as static library 
   ar rs libSwap.a swap.o
3.  Compile with static library main
 g++ main.cpp -lSwap -Lsrc -Iinclued -o main.exe
4.  Run the executable 
 ./main.exe

To be sure ：
1、-Lsrc Is to execute the path of the static library file , Instead of specifying the source code path
2、-lSwap Do not link static libraries with complete static library names (lib*.a) Write it in

3.2 Dynamic library

1.  Generate binaries 
   g++ -c swap.cpp -I../include -fPIC -shared -o libSwap.so
2.  Archive as static library 
   ar rs libSwap.a swap.o
3.  Compile with static library main
 g++ main.cpp -lSwap -Lsrc -Iinclued -o main.exe
4.  Run the executable 
 LD_LIBRARY_PATH=src ./main.exe

You need to indicate the path of the dynamic library .

4. gdb debugging

gdb Debugging needs to be added at compile time -g Parameters , Ability to support gdb debugging .

gdb file
ctrl -x ctrl -a
 or ：
gdbtui file