嵌入式GCC笔记

GNU C Complier

查看 gcc 版本 :gcc -v

文件后缀名 .c的后缀为C语言的文件源码

gcc -o output

gcc -o 输出文件名字输入文件名

gcc -v -o output 输出gcc 编译过程的所需文件信息

预处理—— -E 让GCC编译预处理后就停止——对文件进行替换#define #include

#  "1.c"

#  "<built-in>"

#  "<command-line>"

#  "/usr/include/stdc-predef.h"

#  "<command-line>"

#  "1.c"

#  "/usr/include/stdio.h"

#  "/usr/include/stdio.h"

#  "/usr/include/features.h"

#  "/usr/include/features.h"

#  "/usr/include/x86_64-linux-gnu/sys/cdefs.h"

#  "/usr/include/x86_64-linux-gnu/sys/cdefs.h"

#  "/usr/include/x86_64-linux-gnu/bits/wordsize.h"

#  "/usr/include/x86_64-linux-gnu/sys/cdefs.h"

#  "/usr/include/features.h"

#  "/usr/include/features.h"

#  "/usr/include/x86_64-linux-gnu/gnu/stubs.h"

#  "/usr/include/x86_64-linux-gnu/gnu/stubs.h"

#  "/usr/include/x86_64-linux-gnu/gnu/stubs-64.h"

#  "/usr/include/x86_64-linux-gnu/gnu/stubs.h"

#  "/usr/include/features.h"

#  "/usr/include/stdio.h"   

#  "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h"

#  "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h"  

#  "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h"

typedef long unsigned int size_t;

#  "/usr/include/stdio.h"   

#  "/usr/include/x86_64-linux-gnu/bits/types.h"

#  "/usr/include/x86_64-linux-gnu/bits/types.h"

#  "/usr/include/x86_64-linux-gnu/bits/wordsize.h"

#  "/usr/include/x86_64-linux-gnu/bits/types.h"   

typedef unsigned char __u_char;

typedef unsigned short int __u_short;

typedef unsigned int __u_int;

typedef unsigned long int __u_long;

typedef signed char __int8_t;

typedef unsigned char __uint8_t;

typedef signed short int __int16_t;

typedef unsigned short int __uint16_t;

typedef signed int __int32_t;

typedef unsigned int __uint32_t;

typedef signed long int __int64_t;

typedef unsigned long int __uint64_t;

typedef long int __quad_t;

typedef unsigned long int __u_quad_t;

#  "/usr/include/x86_64-linux-gnu/bits/types.h"

#  "/usr/include/x86_64-linux-gnu/bits/typesizes.h"

#  "/usr/include/x86_64-linux-gnu/bits/types.h"   

typedef unsigned long int __dev_t;

typedef unsigned int __uid_t;

typedef unsigned int __gid_t;

typedef unsigned long int __ino_t;

typedef unsigned long int __ino64_t;

typedef unsigned int __mode_t;

typedef unsigned long int __nlink_t;

typedef long int __off_t;

typedef long int __off64_t;

typedef int __pid_t;

typedef struct { int __val[]; } __fsid_t;

typedef long int __clock_t;

typedef unsigned long int __rlim_t;

typedef unsigned long int __rlim64_t;

typedef unsigned int __id_t;

typedef long int __time_t;

typedef unsigned int __useconds_t;

typedef long int __suseconds_t;

typedef int __daddr_t;

typedef int __key_t;

typedef int __clockid_t;

typedef void * __timer_t;

typedef long int __blksize_t;

typedef long int __blkcnt_t;

typedef long int __blkcnt64_t;

typedef unsigned long int __fsblkcnt_t;

typedef unsigned long int __fsblkcnt64_t;

typedef unsigned long int __fsfilcnt_t;

typedef unsigned long int __fsfilcnt64_t;

typedef long int __fsword_t;

typedef long int __ssize_t;

typedef long int __syscall_slong_t;

typedef unsigned long int __syscall_ulong_t;

typedef __off64_t __loff_t;

typedef __quad_t *__qaddr_t;

typedef char *__caddr_t;

typedef long int __intptr_t;

typedef unsigned int __socklen_t;

#  "/usr/include/stdio.h"

#  "/usr/include/stdio.h"

struct _IO_FILE;

typedef struct _IO_FILE FILE;

#  "/usr/include/stdio.h"

typedef struct _IO_FILE __FILE;

#  "/usr/include/stdio.h"

#  "/usr/include/libio.h"

#  "/usr/include/libio.h"

#  "/usr/include/_G_config.h"

#  "/usr/include/_G_config.h"

#  "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h"

#  "/usr/include/_G_config.h"   

#  "/usr/include/wchar.h"

#  "/usr/include/wchar.h"

typedef struct

{

  int __count;

  union

  {

    unsigned int __wch;

    char __wchb[];

  } __value;

} __mbstate_t;

#  "/usr/include/_G_config.h"

typedef struct

{

  __off_t __pos;

  __mbstate_t __state;

} _G_fpos_t;

typedef struct

{

  __off64_t __pos;

  __mbstate_t __state;

} _G_fpos64_t;

#  "/usr/include/libio.h"

#  "/usr/include/libio.h"

#  "/usr/lib/gcc/x86_64-linux-gnu/5/include/stdarg.h"

#  "/usr/lib/gcc/x86_64-linux-gnu/5/include/stdarg.h"

typedef __builtin_va_list __gnuc_va_list;

#  "/usr/include/libio.h"

#  "/usr/include/libio.h"

struct _IO_jump_t; struct _IO_FILE;

typedef void _IO_lock_t;

struct _IO_marker {

  struct _IO_marker *_next;

  struct _IO_FILE *_sbuf;

  int _pos;

#  "/usr/include/libio.h"

};

enum __codecvt_result

{

  __codecvt_ok,

  __codecvt_partial,

  __codecvt_error,

  __codecvt_noconv

};

#  "/usr/include/libio.h"

struct _IO_FILE {

  int _flags;

  char* _IO_read_ptr;

  char* _IO_read_end;

  char* _IO_read_base;

  char* _IO_write_base;

  char* _IO_write_ptr;

  char* _IO_write_end;

  char* _IO_buf_base;

  char* _IO_buf_end;

  char *_IO_save_base;

  char *_IO_backup_base;

  char *_IO_save_end;

  struct _IO_marker *_markers;

  struct _IO_FILE *_chain;

  int _fileno;

  int _flags2;

  __off_t _old_offset;

  unsigned short _cur_column;

  signed char _vtable_offset;

  char _shortbuf[];

  _IO_lock_t *_lock;

#  "/usr/include/libio.h"

  __off64_t _offset;

  void *__pad1;

  void *__pad2;

  void *__pad3;

  void *__pad4;

  size_t __pad5;

  int _mode;

  char _unused2[ * sizeof (int) -  * sizeof (void *) - sizeof (size_t)];

};

typedef struct _IO_FILE _IO_FILE;

struct _IO_FILE_plus;

extern struct _IO_FILE_plus _IO_2_1_stdin_;

extern struct _IO_FILE_plus _IO_2_1_stdout_;

extern struct _IO_FILE_plus _IO_2_1_stderr_;

#  "/usr/include/libio.h"

typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);

typedef __ssize_t __io_write_fn (void *__cookie, const char *__buf,

     size_t __n);

typedef int __io_seek_fn (void *__cookie, __off64_t *__pos, int __w);

typedef int __io_close_fn (void *__cookie);

#  "/usr/include/libio.h"

extern int __underflow (_IO_FILE *);

extern int __uflow (_IO_FILE *);

extern int __overflow (_IO_FILE *, int);

#  "/usr/include/libio.h"

extern int _IO_getc (_IO_FILE *__fp);

extern int _IO_putc (int __c, _IO_FILE *__fp);

extern int _IO_feof (_IO_FILE *__fp) __attribute__ ((__nothrow__ , __leaf__));

extern int _IO_ferror (_IO_FILE *__fp) __attribute__ ((__nothrow__ , __leaf__));

extern int _IO_peekc_locked (_IO_FILE *__fp);

extern void _IO_flockfile (_IO_FILE *) __attribute__ ((__nothrow__ , __leaf__));

extern void _IO_funlockfile (_IO_FILE *) __attribute__ ((__nothrow__ , __leaf__));

extern int _IO_ftrylockfile (_IO_FILE *) __attribute__ ((__nothrow__ , __leaf__));

#  "/usr/include/libio.h"

extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,

   __gnuc_va_list, int *__restrict);

extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,

    __gnuc_va_list);

extern __ssize_t _IO_padn (_IO_FILE *, int, __ssize_t);

extern size_t _IO_sgetn (_IO_FILE *, void *, size_t);

extern __off64_t _IO_seekoff (_IO_FILE *, __off64_t, int, int);

extern __off64_t _IO_seekpos (_IO_FILE *, __off64_t, int);

extern void _IO_free_backup_area (_IO_FILE *) __attribute__ ((__nothrow__ , __leaf__));

#  "/usr/include/stdio.h"   

typedef __gnuc_va_list va_list;

#  "/usr/include/stdio.h"

typedef __off_t off_t;

#  "/usr/include/stdio.h"

typedef __ssize_t ssize_t;

typedef _G_fpos_t fpos_t;

#  "/usr/include/stdio.h"

#  "/usr/include/x86_64-linux-gnu/bits/stdio_lim.h"

#  "/usr/include/stdio.h"   

extern struct _IO_FILE *stdin;

extern struct _IO_FILE *stdout;

extern struct _IO_FILE *stderr;

extern int remove (const char *__filename) __attribute__ ((__nothrow__ , __leaf__));

extern int rename (const char *__old, const char *__new) __attribute__ ((__nothrow__ , __leaf__));

extern int renameat (int __oldfd, const char *__old, int __newfd,

       const char *__new) __attribute__ ((__nothrow__ , __leaf__));

extern FILE *tmpfile (void) ;

#  "/usr/include/stdio.h"

extern char *tmpnam (char *__s) __attribute__ ((__nothrow__ , __leaf__)) ;

extern char *tmpnam_r (char *__s) __attribute__ ((__nothrow__ , __leaf__)) ;

#  "/usr/include/stdio.h"

extern char *tempnam (const char *__dir, const char *__pfx)

     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__malloc__)) ;

extern int fclose (FILE *__stream);

extern int fflush (FILE *__stream);

#  "/usr/include/stdio.h"

extern int fflush_unlocked (FILE *__stream);

#  "/usr/include/stdio.h"  

extern FILE *fopen (const char *__restrict __filename,

      const char *__restrict __modes) ;

extern FILE *freopen (const char *__restrict __filename,

        const char *__restrict __modes,

        FILE *__restrict __stream) ;

#  "/usr/include/stdio.h"  

#  "/usr/include/stdio.h"

extern FILE *fdopen (int __fd, const char *__modes) __attribute__ ((__nothrow__ , __leaf__)) ;

#  "/usr/include/stdio.h"

extern FILE *fmemopen (void *__s, size_t __len, const char *__modes)

  __attribute__ ((__nothrow__ , __leaf__)) ;

extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __attribute__ ((__nothrow__ , __leaf__)) ;

extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __attribute__ ((__nothrow__ , __leaf__));

extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,

      int __modes, size_t __n) __attribute__ ((__nothrow__ , __leaf__));

extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,

         size_t __size) __attribute__ ((__nothrow__ , __leaf__));

extern void setlinebuf (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));

extern int fprintf (FILE *__restrict __stream,

      const char *__restrict __format, ...);

extern int printf (const char *__restrict __format, ...);

extern int sprintf (char *__restrict __s,

      const char *__restrict __format, ...) __attribute__ ((__nothrow__));

extern int vfprintf (FILE *__restrict __s, const char *__restrict __format,

       __gnuc_va_list __arg);

extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg);

extern int vsprintf (char *__restrict __s, const char *__restrict __format,

       __gnuc_va_list __arg) __attribute__ ((__nothrow__));

extern int snprintf (char *__restrict __s, size_t __maxlen,

       const char *__restrict __format, ...)

     __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, , )));

extern int vsnprintf (char *__restrict __s, size_t __maxlen,

        const char *__restrict __format, __gnuc_va_list __arg)

     __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, , )));

#  "/usr/include/stdio.h"

extern int vdprintf (int __fd, const char *__restrict __fmt,

       __gnuc_va_list __arg)

     __attribute__ ((__format__ (__printf__, , )));

extern int dprintf (int __fd, const char *__restrict __fmt, ...)

     __attribute__ ((__format__ (__printf__, , )));

extern int fscanf (FILE *__restrict __stream,

     const char *__restrict __format, ...) ;

extern int scanf (const char *__restrict __format, ...) ;

extern int sscanf (const char *__restrict __s,

     const char *__restrict __format, ...) __attribute__ ((__nothrow__ , __leaf__));

#  "/usr/include/stdio.h"

extern int fscanf (FILE *__restrict __stream, const char *__restrict __format, ...) __asm__ ("" "__isoc99_fscanf")

                               ;

extern int scanf (const char *__restrict __format, ...) __asm__ ("" "__isoc99_scanf")

                              ;

extern int sscanf (const char *__restrict __s, const char *__restrict __format, ...) __asm__ ("" "__isoc99_sscanf") __attribute__ ((__nothrow__ , __leaf__))

                      ;

#  "/usr/include/stdio.h"  

extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,

      __gnuc_va_list __arg)

     __attribute__ ((__format__ (__scanf__, , ))) ;

extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg)

     __attribute__ ((__format__ (__scanf__, , ))) ;

extern int vsscanf (const char *__restrict __s,

      const char *__restrict __format, __gnuc_va_list __arg)

     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__format__ (__scanf__, , )));

#  "/usr/include/stdio.h"

extern int vfscanf (FILE *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vfscanf")

     __attribute__ ((__format__ (__scanf__, , ))) ;

extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vscanf")

     __attribute__ ((__format__ (__scanf__, , ))) ;

extern int vsscanf (const char *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vsscanf") __attribute__ ((__nothrow__ , __leaf__))

     __attribute__ ((__format__ (__scanf__, , )));

#  "/usr/include/stdio.h"  

extern int fgetc (FILE *__stream);

extern int getc (FILE *__stream);

extern int getchar (void);

#  "/usr/include/stdio.h"

extern int getc_unlocked (FILE *__stream);

extern int getchar_unlocked (void);

#  "/usr/include/stdio.h"

extern int fgetc_unlocked (FILE *__stream);

extern int fputc (int __c, FILE *__stream);

extern int putc (int __c, FILE *__stream);

extern int putchar (int __c);

#  "/usr/include/stdio.h"

extern int fputc_unlocked (int __c, FILE *__stream);

extern int putc_unlocked (int __c, FILE *__stream);

extern int putchar_unlocked (int __c);

extern int getw (FILE *__stream);

extern int putw (int __w, FILE *__stream);

extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)

     ;

#  "/usr/include/stdio.h"  

#  "/usr/include/stdio.h"

extern __ssize_t __getdelim (char **__restrict __lineptr,

          size_t *__restrict __n, int __delimiter,

          FILE *__restrict __stream) ;

extern __ssize_t getdelim (char **__restrict __lineptr,

        size_t *__restrict __n, int __delimiter,

        FILE *__restrict __stream) ;

extern __ssize_t getline (char **__restrict __lineptr,

       size_t *__restrict __n,

       FILE *__restrict __stream) ;

extern int fputs (const char *__restrict __s, FILE *__restrict __stream);

extern int puts (const char *__s);

extern int ungetc (int __c, FILE *__stream);

extern size_t fread (void *__restrict __ptr, size_t __size,

       size_t __n, FILE *__restrict __stream) ;

extern size_t fwrite (const void *__restrict __ptr, size_t __size,

        size_t __n, FILE *__restrict __s);

#  "/usr/include/stdio.h"

extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,

         size_t __n, FILE *__restrict __stream) ;

extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size,

          size_t __n, FILE *__restrict __stream);

extern int fseek (FILE *__stream, long int __off, int __whence);

extern long int ftell (FILE *__stream) ;

extern void rewind (FILE *__stream);

#  "/usr/include/stdio.h"

extern int fseeko (FILE *__stream, __off_t __off, int __whence);

extern __off_t ftello (FILE *__stream) ;

#  "/usr/include/stdio.h"  

extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);

extern int fsetpos (FILE *__stream, const fpos_t *__pos);

#  "/usr/include/stdio.h"  

#  "/usr/include/stdio.h"  

extern void clearerr (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));

extern int feof (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

extern int ferror (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

extern void clearerr_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));

extern int feof_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

extern int ferror_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

extern void perror (const char *__s);

#  "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"

#  "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"

extern int sys_nerr;

extern const char *const sys_errlist[];

#  "/usr/include/stdio.h"   

extern int fileno (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

extern int fileno_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

#  "/usr/include/stdio.h"

extern FILE *popen (const char *__command, const char *__modes) ;

extern int pclose (FILE *__stream);

extern char *ctermid (char *__s) __attribute__ ((__nothrow__ , __leaf__));

#  "/usr/include/stdio.h"

extern void flockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));

extern int ftrylockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;

extern void funlockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));

#  "/usr/include/stdio.h"  

#  "1.c" 

#  "1.c"

int main(){

 printf("hello world\n");

 return ;

}

out.i

编译—— gcc -S ——.s文件　　cc1

汇编——gcc -c ——.o文件　　collect2

链接——gcc -o——可执行文件

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