-fPIC \u4f5c\u7528\u4e8e\u7f16\u8bd1\u9636\u6bb5\uff0c\u544a\u8bc9\u7f16\u8bd1\u5668\u4ea7\u751f\u4e0e\u4f4d\u7f6e\u65e0\u5173\u4ee3\u7801(Position-Independent Code)\uff0c
\n\u00a0\u00a0\u5219\u4ea7\u751f\u7684\u4ee3\u7801\u4e2d\uff0c\u6ca1\u6709\u7edd\u5bf9\u5730\u5740\uff0c\u5168\u90e8\u4f7f\u7528\u76f8\u5bf9\u5730\u5740\uff0c\u6545\u800c\u4ee3\u7801\u53ef\u4ee5\u88ab\u52a0\u8f7d\u5668\u52a0\u8f7d\u5230\u5185\u5b58\u7684\u4efb\u610f
\n\u00a0\u00a0\u4f4d\u7f6e\uff0c\u90fd\u53ef\u4ee5\u6b63\u786e\u7684\u6267\u884c\u3002\u8fd9\u6b63\u662f\u5171\u4eab\u5e93\u6240\u8981\u6c42\u7684\uff0c\u5171\u4eab\u5e93\u88ab\u52a0\u8f7d\u65f6\uff0c\u5728\u5185\u5b58\u7684\u4f4d\u7f6e\u4e0d\u662f\u56fa\u5b9a\u7684\u3002<\/p>\n
gcc -shared -fPIC -o 1.so 1.c
\n\u8fd9\u91cc\u6709\u4e00\u4e2a-fPIC\u53c2\u6570
\nPIC\u5c31\u662fposition independent code
\nPIC\u4f7f.so\u6587\u4ef6\u7684\u4ee3\u7801\u6bb5\u53d8\u4e3a\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u5171\u4eab
\n\u5982\u679c\u4e0d\u52a0-fPIC,\u5219\u52a0\u8f7d.so\u6587\u4ef6\u7684\u4ee3\u7801\u6bb5\u65f6,\u4ee3\u7801\u6bb5\u5f15\u7528\u7684\u6570\u636e\u5bf9\u8c61\u9700\u8981\u91cd\u5b9a\u4f4d, \u91cd\u5b9a\u4f4d\u4f1a\u4fee\u6539\u4ee3\u7801\u6bb5\u7684\u5185\u5bb9,\u8fd9\u5c31\u9020\u6210\u6bcf\u4e2a\u4f7f\u7528\u8fd9\u4e2a.so\u6587\u4ef6\u4ee3\u7801\u6bb5\u7684\u8fdb\u7a0b\u5728\u5185\u6838\u91cc\u90fd\u4f1a\u751f\u6210\u8fd9\u4e2a.so\u6587\u4ef6\u4ee3\u7801\u6bb5\u7684copy.\u6bcf\u4e2acopy\u90fd\u4e0d\u4e00\u6837,\u53d6\u51b3\u4e8e \u8fd9\u4e2a.so\u6587\u4ef6\u4ee3\u7801\u6bb5\u548c\u6570\u636e\u6bb5\u5185\u5b58\u6620\u5c04\u7684\u4f4d\u7f6e.<\/p>\n
\u4e0d\u52a0fPIC\u7f16\u8bd1\u51fa\u6765\u7684so,\u662f\u8981\u518d\u52a0\u8f7d\u65f6\u6839\u636e\u52a0\u8f7d\u5230\u7684\u4f4d\u7f6e\u518d\u6b21\u91cd\u5b9a\u4f4d\u7684.(\u56e0\u4e3a\u5b83\u91cc\u9762\u7684\u4ee3\u7801\u5e76\u4e0d\u662f\u4f4d\u7f6e\u65e0\u5173\u4ee3\u7801)
\n\u5982\u679c\u88ab\u591a\u4e2a\u5e94\u7528\u7a0b\u5e8f\u5171\u540c\u4f7f\u7528,\u90a3\u4e48\u5b83\u4eec\u5fc5\u987b\u6bcf\u4e2a\u7a0b\u5e8f\u7ef4\u62a4\u4e00\u4efdso\u7684\u4ee3\u7801\u526f\u672c\u4e86.(\u56e0\u4e3aso\u88ab\u6bcf\u4e2a\u7a0b\u5e8f\u52a0\u8f7d\u7684\u4f4d\u7f6e\u90fd\u4e0d\u540c,\u663e\u7136\u8fd9\u4e9b\u91cd\u5b9a\u4f4d\u540e\u7684\u4ee3\u7801\u4e5f\u4e0d\u540c,\u5f53\u7136\u4e0d\u80fd\u5171\u4eab)
\n\u6211\u4eec\u603b\u662f\u7528fPIC\u6765\u751f\u6210so,\u4e5f\u4ece\u6765\u4e0d\u7528fPIC\u6765\u751f\u6210a.
\nfPIC\u4e0e\u52a8\u6001\u94fe\u63a5\u53ef\u4ee5\u8bf4\u57fa\u672c\u6ca1\u6709\u5173\u7cfb,libc.so\u4e00\u6837\u53ef\u4ee5\u4e0d\u7528fPIC\u7f16\u8bd1,\u53ea\u662f\u8fd9\u6837\u7684so\u5fc5\u987b\u8981\u5728\u52a0\u8f7d\u5230\u7528\u6237\u7a0b\u5e8f\u7684\u5730\u5740\u7a7a\u95f4\u65f6\u91cd\u5b9a\u5411\u6240\u6709\u8868\u76ee.<\/p>\n
\u56e0\u6b64,\u4e0d\u7528fPIC\u7f16\u8bd1so\u5e76\u4e0d\u603b\u662f\u4e0d\u597d.
\n\u5982\u679c\u4f60\u6ee1\u8db3\u4ee5\u4e0b4\u4e2a\u9700\u6c42\/\u6761\u4ef6:
\n1.\u8be5\u5e93\u53ef\u80fd\u9700\u8981\u7ecf\u5e38\u66f4\u65b0
\n2.\u8be5\u5e93\u9700\u8981\u975e\u5e38\u9ad8\u7684\u6548\u7387(\u5c24\u5176\u662f\u6709\u5f88\u591a\u5168\u5c40\u91cf\u7684\u4f7f\u7528\u65f6)
\n3.\u8be5\u5e93\u5e76\u4e0d\u5f88\u5927.
\n4.\u8be5\u5e93\u57fa\u672c\u4e0d\u9700\u8981\u88ab\u591a\u4e2a\u5e94\u7528\u7a0b\u5e8f\u5171\u4eab<\/p>\n
\u5982\u679c\u7528\u6ca1\u6709\u52a0\u8fd9\u4e2a\u53c2\u6570\u7684\u7f16\u8bd1\u540e\u7684\u5171\u4eab\u5e93\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u7684\u8bdd\uff0c\u53ef\u80fd\u662f\u4e24\u4e2a\u539f\u56e0\uff1a
\n1\uff1agcc\u9ed8\u8ba4\u5f00\u542f-fPIC\u9009\u9879
\n2\uff1aloader\u4f7f\u4f60\u7684\u4ee3\u7801\u4f4d\u7f6e\u65e0\u5173<\/p>\n
\u4eceGCC\u6765\u770b\uff0cshared\u5e94\u8be5\u662f\u5305\u542bfPIC\u9009\u9879\u7684\uff0c\u4f46\u4f3c\u4e4e\u4e0d\u662f\u6240\u4ee5\u7cfb\u7edf\u90fd\u652f\u6301\uff0c\u6240\u4ee5\u6700\u597d\u663e\u5f0f\u52a0\u4e0afPIC\u9009\u9879\u3002\u53c2\u89c1\u5982\u4e0b<\/p>\n
`-shared’
\n\u00a0\u00a0\u00a0\u00a0\u00a0Produce a shared object which can then be linked with other
\n\u00a0\u00a0\u00a0\u00a0\u00a0objects to form an executable.\u00a0\u00a0Not all systems support this
\n\u00a0\u00a0\u00a0\u00a0\u00a0option.\u00a0\u00a0For predictable results, you must also specify the same
\n\u00a0\u00a0\u00a0\u00a0\u00a0set of options that were used to generate code (`-fpic’, `-fPIC’,
\n\u00a0\u00a0\u00a0\u00a0\u00a0or model suboptions) when you specify this option.(1)<\/p>\n
-fPIC \u7684\u4f7f\u7528\uff0c\u4f1a\u751f\u6210 PIC \u4ee3\u7801\uff0c.so \u8981\u6c42\u4e3a PIC\uff0c\u4ee5\u8fbe\u5230\u52a8\u6001\u94fe\u63a5\u7684\u76ee\u7684\uff0c\u5426\u5219\uff0c\u65e0\u6cd5\u5b9e\u73b0\u52a8\u6001\u94fe\u63a5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
-fPIC \u4f5c\u7528\u4e8e\u7f16\u8bd1\u9636\u6bb5\uff0c\u544a\u8bc9\u7f16\u8bd1\u5668\u4ea7\u751f\u4e0e\u4f4d\u7f6e\u65e0\u5173\u4ee3\u7801(Position-Independent Code) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-2553","post","type-post","status-publish","format-standard","hentry","category-embedded"],"_links":{"self":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/2553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2553"}],"version-history":[{"count":1,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/2553\/revisions"}],"predecessor-version":[{"id":2554,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/2553\/revisions\/2554"}],"wp:attachment":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2553"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}