fatal error: sys/cdefs.h No such file or directory 解决方案  

在64位的ubuntu系统，使用gcc想编译出32位的应用程序，需要使用gcc  -m32选项，但是使用gcc  -m32选项后，出现：

fatal error: sys/cdefs.h: No such file or directory|

可以使用如下方法解决：

sudo  apt-get  update
sudo  apt-get  purge  libc6-dev
sudo  apt-get  install  libc6-dev
sudo  apt-get  install  libc6-dev-i386

gcc和arm-linux-gcc的常用选项

gcc的使用方法：
gcc  [选项]   文件名

gcc常用选项：
  -v：查看gcc编译器的版本，显示gcc执行时的详细过程
  -o <file>                Place the output into <file>
                           指定输出文件名为file，这个名称不能跟源文件名同名
  -E                       Preprocess only; do not compile, assemble or link
                           只预处理，不会编译、汇编、链接
  -S                       Compile only; do not assemble or link
                           只编译，不会汇编、链接
  -c                       Compile and assemble, but do not link
                           编译和汇编，不会链接    
//==================================================
gcc  -v：查看gcc编译器的版本
 
方式1：
gcc hello.c  输出一个a.out，然后./a.out来执行该应用程序。

gcc -o hello hello.c  输出hello，然后./hello来执行该应用程序。

方式2：
gcc -E -o hello.i hello.c
gcc -S -o hello.s hello.i
gcc -c -o hello.o hello.s
gcc -o hello hello.o

.o:object file(OBJ文件)
小结：
1）输入文件的后缀名和选项共同决定gcc到底执行那些操作。
2）在编译过程中，除非使用了-E、-S、-c选项(或者编译出错阻止了完整的编译过程)
   否则最后的步骤都是链接。

方式3：
gcc -c -o hello.o hello.c
gcc -o hello hello.o

gcc会对.c文件默认进行预处理操作，-c再来指明了编译、汇编，从而得到.o文件
再通过gcc -o hello hello.o将.o文件进行链接，得到可执行应用程序。

链接就是将汇编生成的OBJ文件、系统库的OBJ文件、库文件链接起来，
最终生成可以在特定平台运行的可执行程序。

crt1.o、crti.o、crtbegin.o、crtend.o、crtn.o是gcc加入的系统标准启动文件，
对于一般应用程序，这些启动是必需的。

-lc：链接libc库文件，其中libc库文件中就实现了printf等函数。

gcc -v -nostdlib -o hello hello.o会提示因为没有链接系统标准启动文件和标准库文件，而链接失败。
这个-nostdlib选项常用于裸机/bootloader、linux内核等程序，因为它们不需要启动文件、标准库文件。

一般应用程序才需要系统标准启动文件和标准库文件。
裸机/bootloader、linux内核等程序不需要启动文件、标准库文件。

动态链接使用动态链接库进行链接，生成的程序在执行的时候需要加载所需的动态库才能运行。
动态链接生成的程序体积较小，但是必须依赖所需的动态库，否则无法执行。

静态链接使用静态库进行链接，生成的程序包含程序运行所需要的全部库，可以直接运行，
不过静态链接生成的程序体积较大。

gcc -c -o hello.o hello.c
gcc -o hello_shared  hello.o
gcc -static -o hello_static hello.o

book@www.100ask.org:/work/gcc_options/1th$ gcc --help
Usage: gcc [options] file...
Options:
  --help                   Display this information
  -v                       Display the programs invoked by the compiler
  -E                       Preprocess only; do not compile, assemble or link
  -S                       Compile only; do not assemble or link
  -c                       Compile and assemble, but do not link
  -o <file>                Place the output into <file>

链接就是将汇编生成的OBJ文件、系统库的OBJ文件、库文件链接起来，
最终生成可以在特定平台运行的可执行程序。
 
 
book@www.100ask.org:/work/gcc_options/1th$ gcc -v -o hello hello.o
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.4' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' 'hello' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/5/collect2 -plugin /usr/lib/gcc/x86_64-linux-gnu/5/liblto_plugin.so -plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper -plugin-opt=-fresolution=/tmp/ccbhavbV.res
 -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s
 -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc
 -plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id
 --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed
 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro
 -o hello
 /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o
 /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o
 /usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o
 -L/usr/lib/gcc/x86_64-linux-gnu/5
 -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu
 -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib
 -L/lib/x86_64-linux-gnu -L/lib/../lib
 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib
 -L/usr/lib/gcc/x86_64-linux-gnu/5/../../..  
 hello.o
 -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
 /usr/lib/gcc/x86_64-linux-gnu/5/crtend.o
 /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
book@www.100ask.org:/work/gcc_options/1th$

动态链接使用动态链接库进行链接，生成的程序在执行的时候需要加载所需的动态库才能运行。
动态链接生成的程序体积较小，但是必须依赖所需的动态库，否则无法执行。

静态链接使用静态库进行链接，生成的程序包含程序运行所需要的全部库，可以直接运行，
不过静态链接生成的程序体积较大。

1> Hello.c

#include <stdio.h>#define   MAX  20
#define   MIN  10 #define  _DEBUG
#define   SetBit(x)  (1<<x) int main(int argc, char* argv[])
{printf("Hello World \n");printf("MAX = %d,MIN = %d,MAX + MIN = %d\n",MAX,MIN,MAX + MIN); #ifdef _DEBUGprintf("SetBit(5) = %d,SetBit(6) = %d\n",SetBit(5),SetBit(6));printf("SetBit( SetBit(2) ) = %d\n",SetBit( SetBit(2) ));
#endif    return 0;
}

2> hello.i

# 1 "hello.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "hello.c"
# 1 "/usr/include/stdio.h" 1 3 4
# 27 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/features.h" 1 3 4
# 367 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 1 3 4
# 410 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 411 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 2 3 4
# 368 "/usr/include/features.h" 2 3 4
# 391 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 1 3 4
# 10 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/gnu/stubs-64.h" 1 3 4
# 11 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 2 3 4
# 392 "/usr/include/features.h" 2 3 4
# 28 "/usr/include/stdio.h" 2 3 4# 1 "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h" 1 3 4
# 216 "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h" 3 4# 216 "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h" 3 4
typedef long unsigned int size_t;
# 34 "/usr/include/stdio.h" 2 3 4# 1 "/usr/include/x86_64-linux-gnu/bits/types.h" 1 3 4
# 27 "/usr/include/x86_64-linux-gnu/bits/types.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 28 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4typedef 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;
# 121 "/usr/include/x86_64-linux-gnu/bits/types.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/typesizes.h" 1 3 4
# 122 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4typedef 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[2]; } __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;
# 36 "/usr/include/stdio.h" 2 3 4
# 44 "/usr/include/stdio.h" 3 4
struct _IO_FILE;typedef struct _IO_FILE FILE;# 64 "/usr/include/stdio.h" 3 4
typedef struct _IO_FILE __FILE;
# 74 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/libio.h" 1 3 4
# 31 "/usr/include/libio.h" 3 4
# 1 "/usr/include/_G_config.h" 1 3 4
# 15 "/usr/include/_G_config.h" 3 4
# 1 "/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h" 1 3 4
# 16 "/usr/include/_G_config.h" 2 3 4# 1 "/usr/include/wchar.h" 1 3 4
# 82 "/usr/include/wchar.h" 3 4
typedef struct
{int __count;union{unsigned int __wch;char __wchb[4];} __value;
} __mbstate_t;
# 21 "/usr/include/_G_config.h" 2 3 4
typedef struct
{__off_t __pos;__mbstate_t __state;
} _G_fpos_t;
typedef struct
{__off64_t __pos;__mbstate_t __state;
} _G_fpos64_t;
# 32 "/usr/include/libio.h" 2 3 4
# 49 "/usr/include/libio.h" 3 4
# 1 "/usr/lib/gcc/x86_64-linux-gnu/5/include/stdarg.h" 1 3 4
# 40 "/usr/lib/gcc/x86_64-linux-gnu/5/include/stdarg.h" 3 4
typedef __builtin_va_list __gnuc_va_list;
# 50 "/usr/include/libio.h" 2 3 4
# 144 "/usr/include/libio.h" 3 4
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;
# 173 "/usr/include/libio.h" 3 4
};enum __codecvt_result
{__codecvt_ok,__codecvt_partial,__codecvt_error,__codecvt_noconv
};
# 241 "/usr/include/libio.h" 3 4
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[1];_IO_lock_t *_lock;
# 289 "/usr/include/libio.h" 3 4__off64_t _offset;void *__pad1;void *__pad2;void *__pad3;void *__pad4;size_t __pad5;int _mode;char _unused2[15 * sizeof (int) - 4 * 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_;
# 333 "/usr/include/libio.h" 3 4
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);
# 385 "/usr/include/libio.h" 3 4
extern int __underflow (_IO_FILE *);
extern int __uflow (_IO_FILE *);
extern int __overflow (_IO_FILE *, int);
# 429 "/usr/include/libio.h" 3 4
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__));
# 459 "/usr/include/libio.h" 3 4
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__));
# 75 "/usr/include/stdio.h" 2 3 4typedef __gnuc_va_list va_list;
# 90 "/usr/include/stdio.h" 3 4
typedef __off_t off_t;
# 102 "/usr/include/stdio.h" 3 4
typedef __ssize_t ssize_t;typedef _G_fpos_t fpos_t;# 164 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/stdio_lim.h" 1 3 4
# 165 "/usr/include/stdio.h" 2 3 4extern 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) ;
# 209 "/usr/include/stdio.h" 3 4
extern char *tmpnam (char *__s) __attribute__ ((__nothrow__ , __leaf__)) ;extern char *tmpnam_r (char *__s) __attribute__ ((__nothrow__ , __leaf__)) ;
# 227 "/usr/include/stdio.h" 3 4
extern char *tempnam (const char *__dir, const char *__pfx)__attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__malloc__)) ;extern int fclose (FILE *__stream);extern int fflush (FILE *__stream);# 252 "/usr/include/stdio.h" 3 4
extern int fflush_unlocked (FILE *__stream);
# 266 "/usr/include/stdio.h" 3 4extern FILE *fopen (const char *__restrict __filename,const char *__restrict __modes) ;extern FILE *freopen (const char *__restrict __filename,const char *__restrict __modes,FILE *__restrict __stream) ;
# 295 "/usr/include/stdio.h" 3 4# 306 "/usr/include/stdio.h" 3 4
extern FILE *fdopen (int __fd, const char *__modes) __attribute__ ((__nothrow__ , __leaf__)) ;
# 319 "/usr/include/stdio.h" 3 4
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__, 3, 4)));extern int vsnprintf (char *__restrict __s, size_t __maxlen,const char *__restrict __format, __gnuc_va_list __arg)__attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 0)));# 412 "/usr/include/stdio.h" 3 4
extern int vdprintf (int __fd, const char *__restrict __fmt,__gnuc_va_list __arg)__attribute__ ((__format__ (__printf__, 2, 0)));
extern int dprintf (int __fd, const char *__restrict __fmt, ...)__attribute__ ((__format__ (__printf__, 2, 3)));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__));
# 443 "/usr/include/stdio.h" 3 4
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__));
# 463 "/usr/include/stdio.h" 3 4extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,__gnuc_va_list __arg)__attribute__ ((__format__ (__scanf__, 2, 0))) ;extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg)__attribute__ ((__format__ (__scanf__, 1, 0))) ;extern int vsscanf (const char *__restrict __s,const char *__restrict __format, __gnuc_va_list __arg)__attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__format__ (__scanf__, 2, 0)));
# 494 "/usr/include/stdio.h" 3 4
extern int vfscanf (FILE *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vfscanf")__attribute__ ((__format__ (__scanf__, 2, 0))) ;
extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vscanf")__attribute__ ((__format__ (__scanf__, 1, 0))) ;
extern int vsscanf (const char *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vsscanf") __attribute__ ((__nothrow__ , __leaf__))__attribute__ ((__format__ (__scanf__, 2, 0)));
# 522 "/usr/include/stdio.h" 3 4extern int fgetc (FILE *__stream);
extern int getc (FILE *__stream);extern int getchar (void);# 550 "/usr/include/stdio.h" 3 4
extern int getc_unlocked (FILE *__stream);
extern int getchar_unlocked (void);
# 561 "/usr/include/stdio.h" 3 4
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);# 594 "/usr/include/stdio.h" 3 4
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);
# 640 "/usr/include/stdio.h" 3 4# 665 "/usr/include/stdio.h" 3 4
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);# 737 "/usr/include/stdio.h" 3 4
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);# 773 "/usr/include/stdio.h" 3 4
extern int fseeko (FILE *__stream, __off_t __off, int __whence);extern __off_t ftello (FILE *__stream) ;
# 792 "/usr/include/stdio.h" 3 4extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);extern int fsetpos (FILE *__stream, const fpos_t *__pos);
# 815 "/usr/include/stdio.h" 3 4# 824 "/usr/include/stdio.h" 3 4extern 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);# 1 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h" 1 3 4
# 26 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h" 3 4
extern int sys_nerr;
extern const char *const sys_errlist[];
# 854 "/usr/include/stdio.h" 2 3 4extern int fileno (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;extern int fileno_unlocked (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;
# 872 "/usr/include/stdio.h" 3 4
extern FILE *popen (const char *__command, const char *__modes) ;extern int pclose (FILE *__stream);extern char *ctermid (char *__s) __attribute__ ((__nothrow__ , __leaf__));
# 912 "/usr/include/stdio.h" 3 4
extern void flockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));extern int ftrylockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__)) ;extern void funlockfile (FILE *__stream) __attribute__ ((__nothrow__ , __leaf__));
# 942 "/usr/include/stdio.h" 3 4# 2 "hello.c" 2# 9 "hello.c"
int main(int argc, char* argv[])
{printf("Hello World \n");printf("MAX = %d,MIN = %d,MAX + MIN = %d\n",20,10,20 + 10);printf("SetBit(5) = %d,SetBit(6) = %d\n",(1<<5),(1<<6));printf("SetBit( SetBit(2) ) = %d\n",(1<<(1<<2)));return 0;
}

3> hello.s

 .file   "hello.c".section .rodata
.LC0:.string    "Hello World ".align 8
.LC1:.string    "MAX = %d,MIN = %d,MAX + MIN = %d\n".align 8
.LC2:.string    "SetBit(5) = %d,SetBit(6) = %d\n"
.LC3:.string    "SetBit( SetBit(2) ) = %d\n".text.globl  main.type   main, @function
main:
.LFB0:.cfi_startprocpushq   %rbp.cfi_def_cfa_offset 16.cfi_offset 6, -16movq    %rsp, %rbp.cfi_def_cfa_register 6subq   $16, %rspmovl   %edi, -4(%rbp)movq  %rsi, -16(%rbp)movl $.LC0, %edicall putsmovl    $30, %ecxmovl   $10, %edxmovl   $20, %esimovl   $.LC1, %edimovl $0, %eaxcall    printfmovl  $64, %edxmovl   $32, %esimovl   $.LC2, %edimovl $0, %eaxcall    printfmovl  $16, %esimovl   $.LC3, %edimovl $0, %eaxcall    printfmovl  $0, %eaxleave.cfi_def_cfa 7, 8ret.cfi_endproc
.LFE0:.size main, .-main.ident  "GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609".section .note.GNU-stack,"",@progbits

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