Use gcc to compile different options to view the intermediate file generation

Overall Flow gcc compiler program C as shown below

Use the following command:

1. .c---> .i

gcc -E hello.c

2. .c--->.s

gcc -S hello.c

3. .c--->.o

gcc -c hello.c

4. .c--->.out

gcc hello.c

5. .o disassemble

objdump -d hello.o

The following examples show you by a

First create a hello.c and a hello.h

Then use the first command gcc -E hello.c

The contents of the file preprocessing particularly large, only part of the screenshot.

And then view assembler files gcc -S hello.c

You can see, a .s file has been generated, there's a lot of content is very complex.

Then compiled object file gcc -c hello.c

Because the target file is a binary file, it can not be viewed by a text editor.

After linking an executable file gcc hello.c

You can also view by objdump disassembly tool disassembly objdump -d hello.o

Disassembled code to be more concise and readable than assembler code generated directly (eliminating a lot of redundant information)