Linux\u5185\u6838\u56e0\u5176\u9ad8\u6548\u6027\u548c\u7075\u6d3b\u6027\u800c\u53d7\u5230\u5e7f\u6cdb\u8d5e\u8a89\uff0c\u800c\u5728\u5176\u57fa\u7840\u4e2d\u5e7f\u6cdb\u5229\u7528\u4e86GNU\u7f16\u8bd1\u5668\u96c6\u5408\uff08GCC\uff09\u7684\u8bb8\u591a\u6269\u5c55\u529f\u80fd\u3002\u8fd9\u4e9b\u6269\u5c55\u5728\u4f18\u5316\u5185\u6838\u6027\u80fd\u548c\u786e\u4fdd\u5728\u4e0d\u540c\u5e73\u53f0\u4e0a\u7684\u517c\u5bb9\u6027\u65b9\u9762\u53d1\u6325\u7740\u91cd\u8981\u4f5c\u7528\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u4e00\u4e9b\u4e3b\u8981\u7684GCC\u6269\u5c55\uff0c\u9644\u5e26\u4ee3\u7801\u793a\u4f8b\uff0c\u5e76\u89e3\u91ca\u5b83\u4eec\u7684\u4f7f\u7528\u65b9\u6cd5\u548c\u4f18\u52bf\u3002<\/p>\n
GNU Compiler Collection\uff08GCC\uff09\u662f\u7531GNU\u9879\u76ee\u5f00\u53d1\u7684\u4e00\u5957\u7a0b\u5e8f\u8bed\u8a00\u7f16\u8bd1\u5668\u96c6\u5408\u3002GCC\u7531\u81ea\u7531\u8f6f\u4ef6\u57fa\u91d1\uff08FSF\uff09\u53d1\u5e03\uff0c\u5e76\u5728GNU\u901a\u7528\u516c\u5171\u8bb8\u53ef\u8bc1\uff08GPL\uff09\u4e0b\u63d0\u4f9b\u3002<\/p>\n
\u6700\u521d\u662f\u4e3a\u4e86C\u8bed\u8a00\u800c\u542f\u52a8\u7684\u7f16\u8bd1\u5668\uff0c\u4f46\u76ee\u524d\u652f\u6301\u591a\u79cd\u7f16\u7a0b\u8bed\u8a00\uff0c\u5305\u62ecC++\u3001Objective-C\u3001Fortran\u3001Ada\u3001Go\u3001D\u7b49\u3002GCC\u63d0\u4f9b\u4e86\u5148\u8fdb\u7684\u4f18\u5316\u529f\u80fd\uff0c\u53ef\u5728\u591a\u4e2a\u5e73\u53f0\u4e0a\u63d0\u4f9b\u53ef\u79fb\u690d\u6027\uff0c\u5e76\u4f7f\u7ec8\u7aef\u7528\u6237\u80fd\u591f\u5728\u8bb8\u591a\u5e73\u53f0\u4e0a\u7f16\u8bd1\u4ee3\u7801\u3002<\/p>\n
GCC\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n
GCC\u4f5c\u4e3a\u4e00\u4e2a\u6807\u51c6\u7684\u7f16\u8bd1\u5668\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u8bb8\u591a\u5f00\u6e90\u9879\u76ee\uff0c\u5305\u62ec\u7f16\u8bd1Linux\u5185\u6838\uff0c\u5176\u7a33\u5065\u6027\u548c\u53ef\u9760\u6027\u4f7f\u5176\u6210\u4e3a\u884c\u4e1a\u6807\u51c6\u3002<\/p>\n
\u793a\u4f8b\uff1a\u6253\u5305\u7684\u7ed3\u6784\u4f53<\/p>\n
struct __attribute__((packed)) tcp_header {\r\n uint16_t source_port;\r\n uint16_t dest_port;\r\n uint32_t sequence;\r\n uint32_t ack_sequence;\r\n uint16_t flags;\r\n uint16_t window_size;\r\n uint16_t checksum;\r\n uint16_t urgent_pointer;\r\n};<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5bf9\u8868\u793aTCP\u5934\u7684\u7ed3\u6784\u4f53\u5e94\u7528\u4e86__attribute__((packed))<\/code>\u5c5e\u6027\u3002\u8be5\u5c5e\u6027\u9632\u6b62\u7f16\u8bd1\u5668\u5728\u7ed3\u6784\u4f53\u6210\u5458\u4e4b\u95f4\u63d2\u5165\u586b\u5145\uff0c\u4ece\u800c\u53ef\u4ee5\u7cbe\u786e\u5730\u63a7\u5236\u5185\u5b58\u4e0a\u7684\u5e03\u5c40\uff0c\u4ee5\u9002\u5e94\u7f51\u7edc\u901a\u4fe1\u7684\u9700\u8981\u3002<\/p>\n\u5176\u4ed6\u5c5e\u6027\uff1a<\/p>\n
\n__attribute__((packed))<\/code>: \u5728\u7ed3\u6784\u4f53\u6210\u5458\u4e4b\u95f4\u7d27\u5bc6\u5730\u6253\u5305\uff0c\u907f\u514d\u63d2\u5165\u586b\u5145\u3002<\/li>\n__attribute__((aligned(x)))<\/code>: \u5c06\u53d8\u91cf\u6216\u7ed3\u6784\u4f53\u5bf9\u9f50\u5230\u6307\u5b9a\u7684\u8fb9\u754c\u3002<\/li>\n__attribute__((noreturn))<\/code>: \u901a\u77e5\u7f16\u8bd1\u5668\u51fd\u6570\u4e0d\u4f1a\u8fd4\u56de\u3002<\/li>\n__attribute__((section(\"...\")))<\/code>: \u5c06\u53d8\u91cf\u6216\u51fd\u6570\u653e\u7f6e\u5728\u7279\u5b9a\u7684\u8282(section)\u4e2d\u3002<\/li>\n<\/ul>\n\u5185\u5efa\u51fd\u6570\uff08Built-in Functions\uff09\uff1a<\/strong><\/h2>\n\u4f8b\u5982\uff1a\u8ba1\u7b97\u6700\u9ad8\u4f4d\u3002<\/p>\n
unsigned int value = 0xFF00;\r\nint msb = 32 - __builtin_clz(value);<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
__builtin_clz<\/code>\u51fd\u6570\u7528\u4e8e\u8ba1\u7b97\u4ece\u503c\u7684\u5f00\u5934\u5f00\u59cb\u7684\u8fde\u7eed\u96f6\u7684\u6570\u91cf\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5b83\u88ab\u7528\u4e8e\u627e\u5230\u53d8\u91cfvalue<\/code>\u7684\u6700\u9ad8\u4f4d\uff08\u5373\u6700\u5de6\u4fa7\u7684\u975e\u96f6\u4f4d\uff09\uff0c\u5e38\u7528\u4e8e\u4f4d\u5b57\u6bb5\u64cd\u4f5c\u3001\u8d44\u6e90\u5206\u914d\u7b49\u8bb8\u591a\u4f4e\u7ea7\u64cd\u4f5c\u3002\u5b83\u8fd8\u53ef\u7528\u4e8e\u5728\u4f4d\u56fe\u4e2d\u641c\u7d22\u7a7a\u95f2\u69fd\u7b49\u573a\u666f\u3002<\/p>\n\u4f8b\u5b50\uff1a\u4f7f\u7528GCC\u5185\u5efa\u51fd\u6570\u8fdb\u884c\u5185\u5b58\u64cd\u4f5c<\/p>\n
void *my_memcpy(void *dest, const void *src, size_t n) {\r\n return __builtin_memcpy(dest, src, n);\r\n}<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
GCC\u5185\u5efa\u51fd\u6570__builtin_memcpy<\/code>\u53ef\u80fd\u6bd4\u6807\u51c6\u7684memcpy<\/code>\u51fd\u6570\u66f4\u9ad8\u6548\uff0c\u5e76\u4e14\u5728\u7279\u5b9a\u7684\u4f18\u5316\u60c5\u51b5\u4e0b\u53ef\u80fd\u8fdb\u884c\u4e86\u7279\u6b8a\u5904\u7406\u3002\u5728\u5185\u6838\u4e2d\uff0c\u4f7f\u7528\u8fd9\u6837\u7684\u5185\u5efa\u51fd\u6570\u53ef\u4ee5\u52a0\u901f\u5185\u5b58\u590d\u5236\u64cd\u4f5c\u3002<\/p>\n\u5176\u4ed6\u5185\u5efa\u51fd\u6570\uff1a<\/p>\n
\n__builtin_popcount<\/code>: \u8ba1\u7b97\u6574\u6570\u4e2d1\u7684\u4f4d\u6570\u3002<\/li>\n__builtin_clz<\/code>: \u8ba1\u7b97\u6574\u6570\u4e2d\u5f00\u5934\u76840\u7684\u4f4d\u6570\uff08Count Leading Zeros\uff09\u3002<\/li>\n__builtin_expect<\/code>: \u4e3a\u4e86\u4f18\u5316\u5206\u652f\u9884\u6d4b\uff0c\u5411\u7f16\u8bd1\u5668\u63d0\u793a\u67d0\u4e2a\u6761\u4ef6\u6700\u6709\u53ef\u80fd\u662f\u771f\u7684\u3002<\/li>\n<\/ul>\n\u7f16\u8bd1\u65f6\u65ad\u8a00 <\/strong><\/h2>\n\u4f8b\u5b50\uff1a\u7f16\u8bd1\u65f6\u65ad\u8a00\u3002<\/p>\n
BUILD_BUG_ON(sizeof(mystruct) != expected_size);<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
BUILD_BUG_ON<\/code> \u662f\u4e00\u4e2a\u5b8f\uff0c\u5728\u7279\u5b9a\u6761\u4ef6\u4e3a\u771f\u7684\u60c5\u51b5\u4e0b\u751f\u6210\u7f16\u8bd1\u9519\u8bef\uff0c\u8fd9\u662f\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\u7684\u3002\u501f\u52a9\u4e8eGCC\u7684\u529f\u80fd\uff0c\u5185\u6838\u5f00\u53d1\u8005\u4f7f\u7528\u8fd9\u4e2a\u5b8f\u6765\u786e\u4fdd\u6570\u636e\u7ed3\u6784\u5177\u6709\u671f\u671b\u7684\u5927\u5c0f\u3002<\/p>\ntypeof<\/code> \u64cd\u4f5c\u7b26<\/h2>\n\u4f8b\u5b50\uff1a\u53d8\u91cf\u7c7b\u578b\u7684\u81ea\u52a8\u63a8\u65ad<\/p>\n
#define min(x, y) ({ \\\r\n typeof(x) _min1 = (x); \\\r\n typeof(y) _min2 = (y); \\\r\n (void) (&_min1 == &_min2); \\\r\n _min1 < _min2 ? _min1 : _min2; \\\r\n})<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
typeof<\/code> \u662f\u4e00\u79cd\u7531GCC\u5f15\u5165\u7684\u81ea\u52a8\u83b7\u53d6\u53d8\u91cf\u7c7b\u578b\u7684\u6269\u5c55\u3002\u5728\u4e0a\u8ff0\u7684 min<\/code> \u5b8f\u4e2d\uff0c\u4f7f\u7528 typeof<\/code> \u63a8\u65ad\u4e86\u53c2\u6570 x<\/code> \u548c y<\/code> \u7684\u7c7b\u578b\uff0c\u7136\u540e\u57fa\u4e8e\u8fd9\u4e9b\u7c7b\u578b\u8fdb\u884c\u4e86\u6bd4\u8f83\u3002\u8fd9\u79cd\u6280\u5de7\u5141\u8bb8\u5728\u4fdd\u6301\u7c7b\u578b\u5b89\u5168\u6027\u7684\u540c\u65f6\u8fdb\u884c\u901a\u7528\u64cd\u4f5c\u3002<\/p>\n\u5bc4\u5b58\u5668\u53d8\u91cf<\/strong><\/h2>\n\u4f8b\u5b50\uff1a\u5c06\u53d8\u91cf\u5206\u914d\u5230\u7279\u5b9a\u5bc4\u5b58\u5668<\/p>\n
register unsigned long sp asm (\"sp\");<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
\u4f7f\u7528\u8fd9\u4e2a\u8bed\u6cd5\uff0c\u5185\u6838\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u76f4\u63a5\u5c06\u53d8\u91cf\u5206\u914d\u5230\u7279\u5b9a\u7684CPU\u5bc4\u5b58\u5668\u3002\u8fd9\u5728\u63d0\u9ad8\u5173\u952e\u51fd\u6570\u6027\u80fd\u65f6\u53ef\u80fd\u4f1a\u88ab\u4f7f\u7528\uff0c\u4f46\u9700\u8981\u975e\u5e38\u8c28\u614e\u3002<\/p>\n
\u7528\u4e8e\u591a\u7ebf\u7a0b\u7684\u6269\u5c55<\/strong><\/h2>\n\u4f8b\u5b50\uff1a\u4f7f\u7528\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8<\/p>\n
__thread int my_thread_variable;<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
__thread<\/code> \u5b58\u50a8\u7c7b\u8bf4\u660e\u7b26\u8868\u793a\u53d8\u91cf\u4f4d\u4e8e\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\uff08TLS\uff09\u4e2d\u3002\u8fd9\u786e\u4fdd\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u5176\u81ea\u5df1\u7684\u53d8\u91cf\u5b9e\u4f8b\uff0c\u5bf9\u4e8e\u9700\u8981\u6bcf\u4e2a\u5185\u6838\u7ebf\u7a0b\u90fd\u6709\u5176\u72ec\u7279\u4e0a\u4e0b\u6587\u7684\u60c5\u51b5\u975e\u5e38\u6709\u7528\u3002<\/p>\n\u8bed\u53e5\u8868\u8fbe\u5f0f\uff08Statement Expressions\uff09 <\/strong><\/h2>\n\u4f8b\u5b50\uff1a\u5728\u5b8f\u5185\u8fdb\u884c\u590d\u6742\u8ba1\u7b97<\/p>\n
#define MAX(a, b) ({ \\\r\n typeof(a) _a = (a); \\\r\n typeof(b) _b = (b); \\\r\n _a > _b ? _a : _b; \\\r\n})<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u8bed\u53e5\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u5728 MAX<\/code> \u5b8f\u5185\u8bc4\u4f30 a<\/code> \u548c b<\/code> \u7684\u6700\u5927\u503c\uff0c\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u8fd9\u79cd\u6280\u5de7\u5728\u9700\u8981\u5728\u5b8f\u5185\u6267\u884c\u591a\u4e2a\u6b65\u9aa4\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u7684\u60c5\u51b5\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/p>\n\u66f4\u8be6\u7ec6\u7684\u89e3\u91ca\uff1a<\/strong><\/p>\n\u5982\u679c\u4e0d\u4f7f\u7528\u8bed\u53e5\u8868\u8fbe\u5f0f\uff0c\u5b8f\u53ef\u80fd\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u65e0\u6cd5\u6309\u9884\u671f\u5de5\u4f5c\u3002\u5728\u4e0d\u4f7f\u7528\u8bed\u53e5\u8868\u8fbe\u5f0f\u7684\u4f20\u7edf\u5b8f\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u53c2\u6570\u5305\u542b\u5177\u6709\u526f\u4f5c\u7528\u7684\u8868\u8fbe\u5f0f\u6216\u8005\u88ab\u591a\u6b21\u8bc4\u4f30\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u95ee\u9898\u3002<\/p>\n
\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u7b80\u5355\u7684 MAX<\/code> \u5b8f\uff1a<\/p>\n#define MAX(a, b) ((a) > (b) ? (a) : (b))<\/code><\/pre>\n\u8fd9\u4e2a\u5b8f\u5728\u901a\u5e38\u60c5\u51b5\u4e0b\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\uff0c\u4f46\u5982\u679c\u5305\u542b\u6709\u526f\u4f5c\u7528\u7684\u8868\u8fbe\u5f0f\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u610f\u5916\u7684\u884c\u4e3a\uff0c\u4f8b\u5982\uff0c\u5982\u679c a<\/code> \u6216 b<\/code> \u4e2d\u5305\u542b\u589e\u91cf\u8fd0\u7b97\u7b26\uff08++\uff09\u3002<\/p>\nint x = 5;\r\nint y = 10;\r\nint z = MAX(x++, y++);<\/code><\/pre>\n\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u7531\u4e8e MAX<\/code> \u5b8f\u4e24\u6b21\u8bc4\u4f30 x<\/code> \u548c y<\/code>\uff0c\u53ef\u80fd\u5bfc\u81f4\u4e0e\u671f\u671b\u7684\u7ed3\u679c\u4e0d\u540c\u7684\u884c\u4e3a\uff0c\u5373 x<\/code> \u548c y<\/code> \u7684\u503c\u4ee5\u610f\u5916\u7684\u65b9\u5f0f\u66f4\u6539\u3002<\/p>\n\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u4f7f\u7528\u8bed\u53e5\u8868\u8fbe\u5f0f\u7684 MAX<\/code> \u5b8f\u5982\u4e0b\uff1a<\/p>\n#define MAX(a, b) ({ \\\r\n typeof(a) _a = (a); \\\r\n typeof(b) _b = (b); \\\r\n _a > _b ? _a : _b; \\\r\n})<\/code><\/pre>\n\u5728\u8fd9\u91cc\uff0ca<\/code> \u548c b<\/code> \u4ec5\u88ab\u8bc4\u4f30\u4e00\u6b21\uff0c\u5176\u7ed3\u679c\u5206\u522b\u5b58\u50a8\u5728 _a<\/code> \u548c _b<\/code> \u4e2d\u3002\u8fd9\u6837\uff0c\u5373\u4f7f\u53c2\u6570\u5305\u542b\u5e26\u6709\u526f\u4f5c\u7528\u7684\u8868\u8fbe\u5f0f\uff0c\u4e5f\u53ea\u4f1a\u8bc4\u4f30\u4e00\u6b21\uff0c\u4ece\u800c\u907f\u514d\u4e86\u610f\u5916\u7684\u526f\u4f5c\u7528\u95ee\u9898\u3002<\/p>\n\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u7684\u5b8f\uff1a<\/p>\n
#define MAX(a, b) ((a) > (b) ? (a) : (b))<\/code><\/pre>\n\u8fd9\u4e2a\u5b8f\u5982\u679c\u4f20\u9012\u5305\u542b ++ \u7684\u8868\u8fbe\u5f0f\uff0c\u4f8b\u5982 MAX(x++, y++)<\/code>\uff0c\u5219\u53ef\u80fd\u88ab\u9884\u5904\u7406\u5668\u5c55\u5f00\u4e3a\u4ee5\u4e0b\u5f62\u5f0f\uff1a<\/p>\n((x++) > (y++) ? (x++) : (y++))<\/code><\/pre>\n\u5728\u5c55\u5f00\u7684\u7ed3\u679c\u4e2d\uff0cx<\/code> \u548c y<\/code> \u5728\u5b8f\u5185\u90e8\u88ab\u591a\u6b21\u5f15\u7528\u3002\u5728\u8bc4\u4f30\u6761\u4ef6\u8868\u8fbe\u5f0f (x++) > (y++)<\/code> \u65f6\uff0cx<\/code> \u548c y<\/code> \u5404\u81ea\u589e\u52a0\u4e00\u6b21\u3002\u7136\u540e\uff0c\u6839\u636e\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff0cx<\/code> \u6216 y<\/code> \u5c06\u518d\u6b21\u589e\u52a0\u4e00\u6b21\u3002\u56e0\u6b64\uff0cx<\/code> \u6216 y<\/code> \u4e2d\u7684\u4e00\u4e2a\u53ef\u80fd\u4f1a\u610f\u5916\u5730\u589e\u52a0\u4e24\u6b21\u3002<\/p>\n\u8fd9\u79cd\u591a\u6b21\u8bc4\u4f30\u7684\u95ee\u9898\uff0c\u7279\u522b\u662f\u6d89\u53ca\u5230\u5177\u6709\u526f\u4f5c\u7528\u7684\u64cd\u4f5c\uff08\u4f8b\u5982\u589e\u91cf\u6216\u51cf\u91cf\uff09\u65f6\uff0c\u5bb9\u6613\u5bfc\u81f4\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u5728\u5c06\u5e26\u6709\u526f\u4f5c\u7528\u7684\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u5b8f\u7684\u53c2\u6570\u4f7f\u7528\u65f6\uff0c\u9700\u8981\u683c\u5916\u5c0f\u5fc3\u3002\u901a\u8fc7\u4f7f\u7528\u8bed\u53e5\u8868\u8fbe\u5f0f\uff0c\u6bcf\u4e2a\u53c2\u6570\u53ea\u88ab\u8bc4\u4f30\u4e00\u6b21\u5e76\u5b58\u50a8\u5728\u4e34\u65f6\u53d8\u91cf\u4e2d\uff0c\u53ef\u4ee5\u9632\u6b62\u8fd9\u7c7b\u95ee\u9898\u7684\u53d1\u751f\u3002<\/p>\n
\u5185\u8054\u6c47\u7f16\u8bed\u6cd5\uff08Inline Assembly\uff09 <\/strong><\/h2>\n\u4f8b\u5b50\uff1a\u4f7f\u7528\u7279\u5b9a\u7684\u6c47\u7f16\u6307\u4ee4<\/p>\n
void disable_interrupts() {\r\n __asm__ __volatile__(\"cli\": : :\"memory\");\r\n}<\/code><\/pre>\n\n\n\n\n\n\n\n\n\n\n\n\n\u89e3\u91ca\uff1a<\/p>\n
\u8fd9\u4e2a\u5185\u8054\u6c47\u7f16\u547d\u4ee4 cli<\/code> \u4f1a\u7981\u7528 CPU \u7684\u4e2d\u65ad\u3002\u5185\u6838\u4f7f\u7528\u8fd9\u6837\u7684\u4f4e\u7ea7\u522b\u6307\u4ee4\u76f4\u63a5\u63a7\u5236\u786c\u4ef6\uff0c\u786e\u4fdd\u5728\u5173\u952e\u64cd\u4f5c\u671f\u95f4\u4e0d\u4f1a\u53d1\u751f\u4e2d\u65ad\u3002<\/p>\n\u6307\u5b9a\u521d\u59cb\u5316\uff08Designated Initializers\uff09<\/strong><\/h2>\n\u4f8b\u5b50\uff1a\u7ed3\u6784\u4f53\u7684\u521d\u59cb\u5316<\/p>\n
struct point {\r\n int x;\r\n int y;\r\n};\r\n\r\nstruct point p = {\r\n .x = 10,\r\n .y = 20\r\n};<\/code><\/pre>\n\u89e3\u91ca\uff1a<\/p>\n
\u6307\u5b9a\u521d\u59cb\u5316\u5668\u5141\u8bb8\u76f4\u63a5\u4e3a\u7ed3\u6784\u4f53\u7684\u7279\u5b9a\u6210\u5458\u5206\u914d\u503c\uff0c\u4f7f\u521d\u59cb\u5316\u66f4\u5177\u53ef\u8bfb\u6027\u4e14\u51cf\u5c11\u9519\u8bef\u3002\u8fd9\u79cd\u65b9\u6cd5\u5728\u53ea\u60f3\u521d\u59cb\u5316\u7ed3\u6784\u4f53\u7684\u90e8\u5206\u6210\u5458\u6216\u8005\u9700\u8981\u660e\u786e\u521d\u59cb\u5316\u987a\u5e8f\u7684\u60c5\u51b5\u4e0b\u7279\u522b\u6709\u7528\u3002<\/p>\n
GCC \u7684\u6269\u5c55\u5e7f\u6cdb\u7528\u4e8e Linux \u5185\u6838\u4ee3\u7801\u5e93\u7684\u5404\u4e2a\u90e8\u5206\uff0c\u901a\u8fc7\u6709\u6548\u5730\u5229\u7528\u8fd9\u4e9b\u6269\u5c55\uff0cLinux \u5728\u5404\u79cd\u786c\u4ef6\u4e0a\u5c55\u73b0\u51fa\u5353\u8d8a\u6027\u80fd\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e9b\u6269\u5c55\uff0c\u5f00\u53d1\u8005\u80fd\u591f\u66f4\u7ec6\u7c92\u5ea6\u5730\u63a7\u5236\u5185\u6838\u7684\u884c\u4e3a\uff0c\u5b9e\u73b0\u9ad8\u6548\u7684\u7cfb\u7edf\u8c03\u7528\u3001\u786c\u4ef6\u64cd\u4f5c\u548c\u6570\u636e\u5904\u7406\u3002<\/p>\n
\u4e3a\u4e86\u5b9e\u73b0 Linux \u5185\u6838\u7684\u9ad8\u7ea7\u529f\u80fd\u548c\u6027\u80fd\uff0c\u5b83\u5145\u5206\u5229\u7528\u4e86 GCC\uff08GNU Compiler Collection\uff09\u7684\u591a\u6837\u5316\u6269\u5c55\u3002\u8fd9\u4e9b\u6269\u5c55\u5bf9\u4e8e\u63d0\u5347\u5185\u6838\u7684\u6027\u80fd\u3001\u7a33\u5b9a\u6027\u4ee5\u53ca\u5728\u4e0d\u540c\u5e73\u53f0\u4e0a\u7684\u517c\u5bb9\u6027\u81f3\u5173\u91cd\u8981\u3002<\/p>\n
\u76f8\u5173\uff1a<\/strong><\/p>\n\n- Linux \u4e0b\u8fdb\u884c C \u6216 C++ \u7f16\u7a0b\u65f6\u91cd\u8981\u7684 GCC \u6807\u5fd7 https:\/\/www.linuxmi.com\/gcc-flags.html<\/a><\/li>\n
- \u5982\u4f55\u5728 Ubuntu 20.04\/22.04 \u4e0a\u5b89\u88c5 GCC \u7f16\u8bd1\u5668 https:\/\/www.linuxmi.com\/ubuntu-20-04-22-04-gcc.html<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Linux\u5185\u6838\u56e0\u5176\u9ad8\u6548\u6027\u548c\u7075\u6d3b\u6027\u800c\u53d7\u5230\u5e7f\u6cdb\u8d5e\u8a89\uff0c\u800c\u5728\u5176\u57fa\u7840\u4e2d\u5e7f\u6cdb\u5229\u7528\u4e86GNU\u7f16\u8bd1\u5668\u96c6\u5408\uff08GCC\uff09\u7684\u8bb8 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[187],"tags":[1049],"class_list":["post-23223","post","type-post","status-publish","format-standard","hentry","category-c","tag-gcc"],"aioseo_notices":[],"views":562,"_links":{"self":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/23223","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/comments?post=23223"}],"version-history":[{"count":6,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/23223\/revisions"}],"predecessor-version":[{"id":23305,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/23223\/revisions\/23305"}],"wp:attachment":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/media?parent=23223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/categories?post=23223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/tags?post=23223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}