G++ compilation command use

g++ main.cpp   Compile the file , Generate an executable program , The default name is 
g++ main.cpp -o main  Compile the file , Generate an executable program , The name is main
g++ main.cpp -I include/    -I  Specify the header directory 
g++ main.cpp -l xxx    -l Parameter specifies the static library name (linux The name of the next static library is libxxx.a   windows Next is  xxx.lib)

C++ The specific steps from the source file to the executable program are ：
Preprocessing compile assembly link
We can use the command to generate the results of a certain step processing separately
Preprocessing -E The essence is the processing of text , Replacement of macro definitions 、 Copy the header file to the corresponding location 、 Delete Note
compile -S Text compiled into assembly code
assembly -o Assembly code into executable instructions
link Static library 、 Dynamic library Links

g++ -E hello.cpp -o hello.i   Get the preprocessed file hello.i
g++ -S hello.i   Get the compiled assembly file hello.s    This name is the default 
g++ -c hello.s   Get the compiled file hello.o
g++ hello.o  -o hello    The single file link here is hello    Sure ./hello perform 

Static library production

g++ -c add.cpp print.cpp       Generate  .o file 
ar rcs libtest.a add.o print.o  Generate static libraries libtest.a
g++ main.cpp -l test   Pay attention to the functions in the library 、 Declaration of a class 

Dynamic library production