[state-Embedded notes] [012] [GCC Program compilation]

GCC Features

The GCC (gun C Compiler) is a powerful, performance-rich multi-platform compiler that is launched by gun. The efficiency of the execution is higher than the average compiler 20%~30%.

Basic uses of GCC

gcc [options] Filenames

GCC compilation process

Hello.c-> Precompiled->hello.i-> compilation->hello.s-> compilation->hello.o-> link->hello

GCC-E hello.c-o hello.i "-e" means to perform preprocessing "-o" for output file name

Gcc-s hello.i-o Hello.s "-S" means to perform the compilation

Gcc-c hello.s-o hello.o "-C" means execution assembly

GCC hello.o-o Hello means execution link

Common file types

. c:c file

. h: Header files

. S: assembly file

. O: Target file

. C or. cc or. cxx:c++ files

. A: Library files

GCC compilation options

-o FileName: Specifies the output file name

-O: Optimizations to the compiler, such as removing variables that are not used in the program

Time/FILENAME Statistics program uptime

-o2: Optimized for compiler, more than-O

-C: Do not link, generate. o File

-G: Generate a program with debugging information, debugging with GDB requires the compiler to have this option

-I: Add non-standard header file path, GCC standard look for header file path/usr/include/

-wall: Generate all warnings

-W: Do not generate any warnings

-d (macro): definition (macro) macros, equivalent to using # define (macro) in a program

[state-Embedded notes] [012] [GCC Program compilation]