Linux编程-GCC编译命令的使用，gcc

小灰灰 2023-10-16 18:50 135阅读 0赞

1.内容简介：

GCC,即GNU编译器套件（GNU Compiler Collection），是最为广泛使用的编译器之一，几乎包含了我们熟知的大部分编程语言，包括CC、C++、 Objective-C、 Fortran、Java、Ada和Go语言前端，也包括了这些语言的库（如libstdc++，libgcj等）。正如某些流行的技术一样，一开始，并没有想到会发展的如此庞大和广泛，GCC的初衷是为GNU操作系统专门编写的一款编译器。

2. GCC快速使用：gcc filename.c直接编译成可执行文件

先来快速看看GCC怎么使用，看下面这个例子：

  1. #include <stdio.h>
  2. int main() {
  3.     int a = 5;
  4.     int b =3;
  5.     int res = sum(a,b);
  6.     printf("sum=%d",res);
  8. }
  10. int sum(int a,int b) {
  11.     int c = a+b;
  12.     return c;
  13. }

用GCC编译结果：

gcc my_sum.c

my_sum.c:5:12: error: implicit declaration of function ‘sum’ is invalid in C99 [-Werror,-Wimplicit-function-declaration]

int res = sum(a,b);

^

1 error generated.

很显然，在编译时，找不到my_sum，可是明明定义了呀。还记得，谭浩强的C语言编程书中说的，先声明，再引用么？把my_sum放在main函数前面，试一下：

  1. #include <stdio.h>
  2. int sum(int a,int b) {
  3.     int c = a+b;
  4.     return c;
  5. }
  7. int main() {
  8.     int a = 5;
  9.     int b =3;
  10.     int res = sum(a,b);
  11.     printf("sum=%d",res);
  13. }

编译成功，运行：

gcc my_sum.c

aibook@aibookdeMacBook-Pro c_stu % ./a.out

sum=8

3. GCC命令常用选项和说明：

将C，C++源代码编译为可执行代码的过程，可以拆分成4个步骤：预处理（Preprocessing）、编译（Compilation）、汇编（Assembly）和链接（Linking）。
上面的gcc filename.c就直讲完成上面4个步骤，编译生成a.out,这个是默认的目标文件名称。

GCC还有许多选项，常用的如下：
-E: 对源文件进行预处理。
-S: 汇编，生成汇编文件。
-c: 生成目标文件。但不进行链接，生成的文件还不能直接运行。当-c后跟多个源文件，会为每个源文件生成一个.o文件，但此时是不能使用-o的。
-o: 指定要生成的结果文件，o是output，而非object。即生成可执行文件。

这个过程，分开可以这样编译：

  1. aibook@aibookdeMacBook-Pro chaper1 % gcc -E my_sum.c -o my_sum.i
  2. aibook@aibookdeMacBook-Pro chaper1 % ls
  3. a.out        my_sum.c    my_sum.i
  4. aibook@aibookdeMacBook-Pro chaper1 % gcc -S my_sum.i
  5. aibook@aibookdeMacBook-Pro chaper1 % ls
  6. a.out        my_sum.c    my_sum.i    my_sum.s
  7. aibook@aibookdeMacBook-Pro chaper1 % gcc -c my_sum.s
  8. aibook@aibookdeMacBook-Pro chaper1 % ls
  9. a.out        my_sum.c    my_sum.i    my_sum.o    my_sum.s
  10. aibook@aibookdeMacBook-Pro chaper1 % gcc -o my_sum my_sum.o
  11. aibook@aibookdeMacBook-Pro chaper1 % ls
  12. a.out        my_sum        my_sum.c    my_sum.i    my_sum.o    my_sum.s
  13. aibook@aibookdeMacBook-Pro chaper1 % my_sum 
  14. sum=8                                                                                                                     aibook@aibookdeMacBook-Pro chaper1 %

当然，我们可以一步到位，知道结果文件：

  1. aibook@aibookdeMacBook-Pro chaper1 % gcc -o my_sum2 my_sum.c
  2. aibook@aibookdeMacBook-Pro chaper1 % ls
  3. a.out        my_sum        my_sum.c    my_sum.i    my_sum.o    my_sum.s    my_sum2
  4. aibook@aibookdeMacBook-Pro chaper1 %

运行my_sum2,结果如下：

aibook@aibookdeMacBook-Pro chaper1 % my_sum2

sum=8

4. 这些中间文件长啥样：

上面编译生成的有.i,.s.o等文件，我们主要来看.i和.s文件的代码：

my_sum.i:

  1. # 1 "my_sum.c"
  2. # 1 "<built-in>" 1
  3. # 1 "<built-in>" 3
  4. # 367 "<built-in>" 3
  5. # 1 "<command line>" 1
  6. # 1 "<built-in>" 2
  7. # 1 "my_sum.c" 2
  8. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 1 3 4
  9. # 64 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  10. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 1 3 4
  11. # 68 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 3 4
  12. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h" 1 3 4
  13. # 649 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h" 3 4
  14. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_symbol_aliasing.h" 1 3 4
  15. # 650 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h" 2 3 4
  16. # 715 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h" 3 4
  17. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_posix_availability.h" 1 3 4
  18. # 716 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h" 2 3 4
  19. # 69 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  20. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/Availability.h" 1 3 4
  21. # 135 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/Availability.h" 3 4
  22. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/AvailabilityVersions.h" 1 3 4
  23. # 136 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/Availability.h" 2 3 4
  24. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/AvailabilityInternal.h" 1 3 4
  25. # 137 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/Availability.h" 2 3 4
  26. # 70 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  28. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_types.h" 1 3 4
  29. # 27 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_types.h" 3 4
  30. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types.h" 1 3 4
  31. # 33 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types.h" 3 4
  32. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/_types.h" 1 3 4
  33. # 32 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/_types.h" 3 4
  34. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/_types.h" 1 3 4
  35. # 37 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/_types.h" 3 4
  36. typedef signed char __int8_t;
  40. typedef unsigned char __uint8_t;
  41. typedef short __int16_t;
  42. typedef unsigned short __uint16_t;
  43. typedef int __int32_t;
  44. typedef unsigned int __uint32_t;
  45. typedef long long __int64_t;
  46. typedef unsigned long long __uint64_t;
  48. typedef long __darwin_intptr_t;
  49. typedef unsigned int __darwin_natural_t;
  50. # 70 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/_types.h" 3 4
  51. typedef int __darwin_ct_rune_t;
  57. typedef union {
  58.  char __mbstate8[128];
  59.  long long _mbstateL;
  60. } __mbstate_t;
  62. typedef __mbstate_t __darwin_mbstate_t;
  65. typedef long int __darwin_ptrdiff_t;
  73. typedef long unsigned int __darwin_size_t;
  79. typedef __builtin_va_list __darwin_va_list;
  85. typedef int __darwin_wchar_t;
  90. typedef __darwin_wchar_t __darwin_rune_t;
  93. typedef int __darwin_wint_t;
  98. typedef unsigned long __darwin_clock_t;
  99. typedef __uint32_t __darwin_socklen_t;
  100. typedef long __darwin_ssize_t;
  101. typedef long __darwin_time_t;
  102. # 33 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/_types.h" 2 3 4
  103. # 34 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types.h" 2 3 4
  104. # 55 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types.h" 3 4
  105. typedef __int64_t __darwin_blkcnt_t;
  106. typedef __int32_t __darwin_blksize_t;
  107. typedef __int32_t __darwin_dev_t;
  108. typedef unsigned int __darwin_fsblkcnt_t;
  109. typedef unsigned int __darwin_fsfilcnt_t;
  110. typedef __uint32_t __darwin_gid_t;
  111. typedef __uint32_t __darwin_id_t;
  112. typedef __uint64_t __darwin_ino64_t;
  114. typedef __darwin_ino64_t __darwin_ino_t;
  118. typedef __darwin_natural_t __darwin_mach_port_name_t;
  119. typedef __darwin_mach_port_name_t __darwin_mach_port_t;
  120. typedef __uint16_t __darwin_mode_t;
  121. typedef __int64_t __darwin_off_t;
  122. typedef __int32_t __darwin_pid_t;
  123. typedef __uint32_t __darwin_sigset_t;
  124. typedef __int32_t __darwin_suseconds_t;
  125. typedef __uint32_t __darwin_uid_t;
  126. typedef __uint32_t __darwin_useconds_t;
  127. typedef unsigned char __darwin_uuid_t[16];
  128. typedef char __darwin_uuid_string_t[37];
  131. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_pthread/_pthread_types.h" 1 3 4
  132. # 57 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_pthread/_pthread_types.h" 3 4
  133. struct __darwin_pthread_handler_rec {
  134.  void (*__routine)(void *);
  135.  void *__arg;
  136.  struct __darwin_pthread_handler_rec *__next;
  137. };
  139. struct _opaque_pthread_attr_t {
  140.  long __sig;
  141.  char __opaque[56];
  142. };
  144. struct _opaque_pthread_cond_t {
  145.  long __sig;
  146.  char __opaque[40];
  147. };
  149. struct _opaque_pthread_condattr_t {
  150.  long __sig;
  151.  char __opaque[8];
  152. };
  154. struct _opaque_pthread_mutex_t {
  155.  long __sig;
  156.  char __opaque[56];
  157. };
  159. struct _opaque_pthread_mutexattr_t {
  160.  long __sig;
  161.  char __opaque[8];
  162. };
  164. struct _opaque_pthread_once_t {
  165.  long __sig;
  166.  char __opaque[8];
  167. };
  169. struct _opaque_pthread_rwlock_t {
  170.  long __sig;
  171.  char __opaque[192];
  172. };
  174. struct _opaque_pthread_rwlockattr_t {
  175.  long __sig;
  176.  char __opaque[16];
  177. };
  179. struct _opaque_pthread_t {
  180.  long __sig;
  181.  struct __darwin_pthread_handler_rec *__cleanup_stack;
  182.  char __opaque[8176];
  183. };
  185. typedef struct _opaque_pthread_attr_t __darwin_pthread_attr_t;
  186. typedef struct _opaque_pthread_cond_t __darwin_pthread_cond_t;
  187. typedef struct _opaque_pthread_condattr_t __darwin_pthread_condattr_t;
  188. typedef unsigned long __darwin_pthread_key_t;
  189. typedef struct _opaque_pthread_mutex_t __darwin_pthread_mutex_t;
  190. typedef struct _opaque_pthread_mutexattr_t __darwin_pthread_mutexattr_t;
  191. typedef struct _opaque_pthread_once_t __darwin_pthread_once_t;
  192. typedef struct _opaque_pthread_rwlock_t __darwin_pthread_rwlock_t;
  193. typedef struct _opaque_pthread_rwlockattr_t __darwin_pthread_rwlockattr_t;
  194. typedef struct _opaque_pthread_t *__darwin_pthread_t;
  195. # 81 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types.h" 2 3 4
  196. # 28 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_types.h" 2 3 4
  197. # 40 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_types.h" 3 4
  198. typedef int __darwin_nl_item;
  199. typedef int __darwin_wctrans_t;
  201. typedef __uint32_t __darwin_wctype_t;
  202. # 72 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  206. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_va_list.h" 1 3 4
  207. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_va_list.h" 3 4
  208. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/types.h" 1 3 4
  209. # 35 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/types.h" 3 4
  210. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 1 3 4
  211. # 76 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 3 4
  212. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int8_t.h" 1 3 4
  213. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int8_t.h" 3 4
  214. typedef signed char int8_t;
  215. # 77 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  216. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int16_t.h" 1 3 4
  217. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int16_t.h" 3 4
  218. typedef short int16_t;
  219. # 78 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  220. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int32_t.h" 1 3 4
  221. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int32_t.h" 3 4
  222. typedef int int32_t;
  223. # 79 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  224. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int64_t.h" 1 3 4
  225. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_int64_t.h" 3 4
  226. typedef long long int64_t;
  227. # 80 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  229. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int8_t.h" 1 3 4
  230. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int8_t.h" 3 4
  231. typedef unsigned char u_int8_t;
  232. # 82 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  233. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int16_t.h" 1 3 4
  234. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int16_t.h" 3 4
  235. typedef unsigned short u_int16_t;
  236. # 83 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  237. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int32_t.h" 1 3 4
  238. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int32_t.h" 3 4
  239. typedef unsigned int u_int32_t;
  240. # 84 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  241. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int64_t.h" 1 3 4
  242. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_u_int64_t.h" 3 4
  243. typedef unsigned long long u_int64_t;
  244. # 85 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  247. typedef int64_t register_t;
  253. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_intptr_t.h" 1 3 4
  254. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_intptr_t.h" 3 4
  255. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/types.h" 1 3 4
  256. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_intptr_t.h" 2 3 4
  258. typedef __darwin_intptr_t intptr_t;
  259. # 93 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  260. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_uintptr_t.h" 1 3 4
  261. # 30 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_uintptr_t.h" 3 4
  262. typedef unsigned long uintptr_t;
  263. # 94 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/i386/types.h" 2 3 4
  267. typedef u_int64_t user_addr_t;
  268. typedef u_int64_t user_size_t;
  269. typedef int64_t user_ssize_t;
  270. typedef int64_t user_long_t;
  271. typedef u_int64_t user_ulong_t;
  272. typedef int64_t user_time_t;
  273. typedef int64_t user_off_t;
  281. typedef u_int64_t syscall_arg_t;
  282. # 36 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/types.h" 2 3 4
  283. # 32 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_va_list.h" 2 3 4
  284. typedef __darwin_va_list va_list;
  285. # 76 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  286. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_size_t.h" 1 3 4
  287. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_size_t.h" 3 4
  288. typedef __darwin_size_t size_t;
  289. # 77 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  290. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_null.h" 1 3 4
  291. # 78 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  293. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/stdio.h" 1 3 4
  294. # 39 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/stdio.h" 3 4
  295. int renameat(int, const char *, int, const char *) __attribute__((availability(macosx,introduced=10.10)));
  302. int renamex_np(const char *, const char *, unsigned int) __attribute__((availability(macosx,introduced=10.12))) __attribute__((availability(ios,introduced=10.0))) __attribute__((availability(tvos,introduced=10.0))) __attribute__((availability(watchos,introduced=3.0)));
  303. int renameatx_np(int, const char *, int, const char *, unsigned int) __attribute__((availability(macosx,introduced=10.12))) __attribute__((availability(ios,introduced=10.0))) __attribute__((availability(tvos,introduced=10.0))) __attribute__((availability(watchos,introduced=3.0)));
  304. # 80 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 2 3 4
  306. typedef __darwin_off_t fpos_t;
  307. # 92 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 3 4
  308. struct __sbuf {
  309.  unsigned char *_base;
  310.  int _size;
  311. };
  314. struct __sFILEX;
  315. # 126 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h" 3 4
  316. typedef struct __sFILE {
  317.  unsigned char *_p;
  318.  int _r;
  319.  int _w;
  320.  short _flags;
  321.  short _file;
  322.  struct __sbuf _bf;
  323.  int _lbfsize;
  326.  void *_cookie;
  327.  int (* _Nullable _close)(void *);
  328.  int (* _Nullable _read) (void *, char *, int);
  329.  fpos_t (* _Nullable _seek) (void *, fpos_t, int);
  330.  int (* _Nullable _write)(void *, const char *, int);
  333.  struct __sbuf _ub;
  334.  struct __sFILEX *_extra;
  335.  int _ur;
  338.  unsigned char _ubuf[3];
  339.  unsigned char _nbuf[1];
  342.  struct __sbuf _lb;
  345.  int _blksize;
  346.  fpos_t _offset;
  347. } FILE;
  348. # 65 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 2 3 4
  351. extern FILE *__stdinp;
  352. extern FILE *__stdoutp;
  353. extern FILE *__stderrp;
  354. # 142 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  355. void clearerr(FILE *);
  356. int fclose(FILE *);
  357. int feof(FILE *);
  358. int ferror(FILE *);
  359. int fflush(FILE *);
  360. int fgetc(FILE *);
  361. int fgetpos(FILE * restrict, fpos_t *);
  362. char *fgets(char * restrict, int, FILE *);
  366. FILE *fopen(const char * restrict __filename, const char * restrict __mode) __asm("_" "fopen" );
  368. int fprintf(FILE * restrict, const char * restrict, ...) __attribute__((__format__ (__printf__, 2, 3)));
  369. int fputc(int, FILE *);
  370. int fputs(const char * restrict, FILE * restrict) __asm("_" "fputs" );
  371. size_t fread(void * restrict __ptr, size_t __size, size_t __nitems, FILE * restrict __stream);
  372. FILE *freopen(const char * restrict, const char * restrict,
  373.                  FILE * restrict) __asm("_" "freopen" );
  374. int fscanf(FILE * restrict, const char * restrict, ...) __attribute__((__format__ (__scanf__, 2, 3)));
  375. int fseek(FILE *, long, int);
  376. int fsetpos(FILE *, const fpos_t *);
  377. long ftell(FILE *);
  378. size_t fwrite(const void * restrict __ptr, size_t __size, size_t __nitems, FILE * restrict __stream) __asm("_" "fwrite" );
  379. int getc(FILE *);
  380. int getchar(void);
  381. char *gets(char *);
  382. void perror(const char *) __attribute__((__cold__));
  383. int printf(const char * restrict, ...) __attribute__((__format__ (__printf__, 1, 2)));
  384. int putc(int, FILE *);
  385. int putchar(int);
  386. int puts(const char *);
  387. int remove(const char *);
  388. int rename (const char *__old, const char *__new);
  389. void rewind(FILE *);
  390. int scanf(const char * restrict, ...) __attribute__((__format__ (__scanf__, 1, 2)));
  391. void setbuf(FILE * restrict, char * restrict);
  392. int setvbuf(FILE * restrict, char * restrict, int, size_t);
  393. int sprintf(char * restrict, const char * restrict, ...) __attribute__((__format__ (__printf__, 2, 3))) __attribute__((__availability__(swift, unavailable, message="Use snprintf instead.")));
  394. int sscanf(const char * restrict, const char * restrict, ...) __attribute__((__format__ (__scanf__, 2, 3)));
  395. FILE *tmpfile(void);
  397. __attribute__((__availability__(swift, unavailable, message="Use mkstemp(3) instead.")))
  399. __attribute__((__deprecated__("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of tmpnam(3), it is highly recommended that you use mkstemp(3) instead.")))
  401. char *tmpnam(char *);
  402. int ungetc(int, FILE *);
  403. int vfprintf(FILE * restrict, const char * restrict, va_list) __attribute__((__format__ (__printf__, 2, 0)));
  404. int vprintf(const char * restrict, va_list) __attribute__((__format__ (__printf__, 1, 0)));
  405. int vsprintf(char * restrict, const char * restrict, va_list) __attribute__((__format__ (__printf__, 2, 0))) __attribute__((__availability__(swift, unavailable, message="Use vsnprintf instead.")));
  406. # 205 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  407. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_ctermid.h" 1 3 4
  408. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_ctermid.h" 3 4
  409. char *ctermid(char *);
  410. # 206 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 2 3 4
  415. FILE *fdopen(int, const char *) __asm("_" "fdopen" );
  417. int fileno(FILE *);
  418. # 228 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  419. int pclose(FILE *) __attribute__((__availability__(swift, unavailable, message="Use posix_spawn APIs or NSTask instead.")));
  423. FILE *popen(const char *, const char *) __asm("_" "popen" ) __attribute__((__availability__(swift, unavailable, message="Use posix_spawn APIs or NSTask instead.")));
  424. # 249 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  425. int __srget(FILE *);
  426. int __svfscanf(FILE *, const char *, va_list) __attribute__((__format__ (__scanf__, 2, 0)));
  427. int __swbuf(int, FILE *);
  428. # 260 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  429. inline __attribute__ ((__always_inline__)) int __sputc(int _c, FILE *_p) {
  430.  if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
  431.   return (*_p->_p++ = _c);
  432.  else
  433.   return (__swbuf(_c, _p));
  434. }
  435. # 286 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  436. void flockfile(FILE *);
  437. int ftrylockfile(FILE *);
  438. void funlockfile(FILE *);
  439. int getc_unlocked(FILE *);
  440. int getchar_unlocked(void);
  441. int putc_unlocked(int, FILE *);
  442. int putchar_unlocked(int);
  446. int getw(FILE *);
  447. int putw(int, FILE *);
  450. __attribute__((__availability__(swift, unavailable, message="Use mkstemp(3) instead.")))
  452. __attribute__((__deprecated__("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of tempnam(3), it is highly recommended that you use mkstemp(3) instead.")))
  454. char *tempnam(const char *__dir, const char *__prefix) __asm("_" "tempnam" );
  455. # 324 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  456. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_off_t.h" 1 3 4
  457. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_off_t.h" 3 4
  458. typedef __darwin_off_t off_t;
  459. # 325 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 2 3 4
  462. int fseeko(FILE * __stream, off_t __offset, int __whence);
  463. off_t ftello(FILE * __stream);
  469. int snprintf(char * restrict __str, size_t __size, const char * restrict __format, ...) __attribute__((__format__ (__printf__, 3, 4)));
  470. int vfscanf(FILE * restrict __stream, const char * restrict __format, va_list) __attribute__((__format__ (__scanf__, 2, 0)));
  471. int vscanf(const char * restrict __format, va_list) __attribute__((__format__ (__scanf__, 1, 0)));
  472. int vsnprintf(char * restrict __str, size_t __size, const char * restrict __format, va_list) __attribute__((__format__ (__printf__, 3, 0)));
  473. int vsscanf(const char * restrict __str, const char * restrict __format, va_list) __attribute__((__format__ (__scanf__, 2, 0)));
  474. # 349 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  475. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_ssize_t.h" 1 3 4
  476. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_ssize_t.h" 3 4
  477. typedef __darwin_ssize_t ssize_t;
  478. # 350 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 2 3 4
  481. int dprintf(int, const char * restrict, ...) __attribute__((__format__ (__printf__, 2, 3))) __attribute__((availability(macosx,introduced=10.7)));
  482. int vdprintf(int, const char * restrict, va_list) __attribute__((__format__ (__printf__, 2, 0))) __attribute__((availability(macosx,introduced=10.7)));
  483. ssize_t getdelim(char ** restrict __linep, size_t * restrict __linecapp, int __delimiter, FILE * restrict __stream) __attribute__((availability(macosx,introduced=10.7)));
  484. ssize_t getline(char ** restrict __linep, size_t * restrict __linecapp, FILE * restrict __stream) __attribute__((availability(macosx,introduced=10.7)));
  485. FILE *fmemopen(void * restrict __buf, size_t __size, const char * restrict __mode) __attribute__((availability(macos,introduced=10.13))) __attribute__((availability(ios,introduced=11.0))) __attribute__((availability(tvos,introduced=11.0))) __attribute__((availability(watchos,introduced=4.0)));
  486. FILE *open_memstream(char **__bufp, size_t *__sizep) __attribute__((availability(macos,introduced=10.13))) __attribute__((availability(ios,introduced=11.0))) __attribute__((availability(tvos,introduced=11.0))) __attribute__((availability(watchos,introduced=4.0)));
  487. # 367 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  488. extern const int sys_nerr;
  489. extern const char *const sys_errlist[];
  491. int asprintf(char ** restrict, const char * restrict, ...) __attribute__((__format__ (__printf__, 2, 3)));
  492. char *ctermid_r(char *);
  493. char *fgetln(FILE *, size_t *);
  494. const char *fmtcheck(const char *, const char *);
  495. int fpurge(FILE *);
  496. void setbuffer(FILE *, char *, int);
  497. int setlinebuf(FILE *);
  498. int vasprintf(char ** restrict, const char * restrict, va_list) __attribute__((__format__ (__printf__, 2, 0)));
  499. FILE *zopen(const char *, const char *, int);
  505. FILE *funopen(const void *,
  506.                  int (* _Nullable)(void *, char *, int),
  507.                  int (* _Nullable)(void *, const char *, int),
  508.                  fpos_t (* _Nullable)(void *, fpos_t, int),
  509.                  int (* _Nullable)(void *));
  510. # 407 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 3 4
  511. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h" 1 3 4
  512. # 31 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h" 3 4
  513. # 1 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_common.h" 1 3 4
  514. # 32 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h" 2 3 4
  515. # 42 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h" 3 4
  516. extern int __sprintf_chk (char * restrict, int, size_t,
  517.      const char * restrict, ...);
  518. # 52 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h" 3 4
  519. extern int __snprintf_chk (char * restrict, size_t, int, size_t,
  520.       const char * restrict, ...);
  528. extern int __vsprintf_chk (char * restrict, int, size_t,
  529.       const char * restrict, va_list);
  537. extern int __vsnprintf_chk (char * restrict, size_t, int, size_t,
  538.        const char * restrict, va_list);
  539. # 408 "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdio.h" 2 3 4
  540. # 2 "my_sum.c" 2
  541. int sum(int a,int b) {
  542.  int c = a+b;
  543.  return c;
  544. }
  546. int main() {
  547.  int a = 5;
  548.  int b =3;
  549.  int res = sum(a,b);
  550.  printf("sum=%d",res);
  552. }

my_sum.s:

  1. .section    __TEXT,__text,regular,pure_instructions
  2.     .build_version macos, 11, 0    sdk_version 11, 3
  3.     .globl    _sum                            ## -- Begin function sum
  4.     .p2align    4, 0x90
  5. _sum:                                   ## @sum
  6.     .cfi_startproc
  7. ## %bb.0:
  8.     pushq    %rbp
  9.     .cfi_def_cfa_offset 16
  10.     .cfi_offset %rbp, -16
  11.     movq    %rsp, %rbp
  12.     .cfi_def_cfa_register %rbp
  13.     movl    %edi, -4(%rbp)
  14.     movl    %esi, -8(%rbp)
  15.     movl    -4(%rbp), %eax
  16.     addl    -8(%rbp), %eax
  17.     movl    %eax, -12(%rbp)
  18.     movl    -12(%rbp), %eax
  19.     popq    %rbp
  20.     retq
  21.     .cfi_endproc
  22.                                         ## -- End function
  23.     .globl    _main                           ## -- Begin function main
  24.     .p2align    4, 0x90
  25. _main:                                  ## @main
  26.     .cfi_startproc
  27. ## %bb.0:
  28.     pushq    %rbp
  29.     .cfi_def_cfa_offset 16
  30.     .cfi_offset %rbp, -16
  31.     movq    %rsp, %rbp
  32.     .cfi_def_cfa_register %rbp
  33.     subq    $16, %rsp
  34.     movl    $5, -4(%rbp)
  35.     movl    $3, -8(%rbp)
  36.     movl    -4(%rbp), %edi
  37.     movl    -8(%rbp), %esi
  38.     callq    _sum
  39.     movl    %eax, -12(%rbp)
  40.     movl    -12(%rbp), %esi
  41.     leaq    L_.str(%rip), %rdi
  42.     movb    $0, %al
  43.     callq    _printf
  44.     xorl    %ecx, %ecx
  45.     movl    %eax, -16(%rbp)                 ## 4-byte Spill
  46.     movl    %ecx, %eax
  47.     addq    $16, %rsp
  48.     popq    %rbp
  49.     retq
  50.     .cfi_endproc
  51.                                         ## -- End function
  52.     .section    __TEXT,__cstring,cstring_literals
  53. L_.str:                                 ## @.str
  54.     .asciz    "sum=%d"
  56. .subsections_via_symbols

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