{"topic":{"id":12689,"title":"Linker Lab 中函数定义不在 relocTable 中是否正常呢？","slug":"topic","categoryId":58,"createdAt":"2024-05-23 15:53:29.366195","bumpedAt":"2024-05-23 16:35:01.186512","views":197,"postsCount":3,"highestPostNumber":3,"likeCount":0,"closed":false,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"在调试 test4 时，void foo() 函数在 strongdef.c 中声明，weakdef.c 中定义，但 weakdef.c 对应的 relocTable 中找不到 foo 符号，因此 linker 返回“undefined reference for symbol foo” 请问这是正常的吗，我是否需要通过其它方法判断函数是否有定义，例如 symbolTable？","deletedAt":null,"isAnonymous":false,"category":{"id":58,"name":"计算机系统导论","slug":"ics","color":"3AB54A"},"author":{"id":467,"username":"Impart","name":null,"avatarUrl":null},"tags":[]},"posts":[{"id":34165,"postNumber":1,"raw":"在调试 test4 时，void foo() 函数在 strongdef.c 中声明，weakdef.c 中定义，但 weakdef.c 对应的 relocTable 中找不到 foo 符号，因此 linker 返回“undefined reference for symbol foo”\n[grid mode=\"tile\"]\n![strongdef.c](/uploads/image/19/31/19317fb8c565816f2d9d426eab33013245d54302ba2166e3f18c283feb5fd3b4.avif)\n![weakdef.c](/uploads/image/a1/4b/a14b58ef2c1596d3dd7eed72e6b4a5f2eb505c00bae983c6a084ab406843857f.avif)\n![image|690x74](/uploads/image/fb/aa/fbaa8aae0c68bdcf214309216e2c60874d3c1e87e2255a73fe4d04ba17f884ff.avif)\n[/grid]\n请问这是正常的吗，我是否需要通过其它方法判断函数是否有定义，例如 symbolTable？","cooked":"

在调试 test4 时，void foo() 函数在 strongdef.c 中声明，weakdef.c 中定义，但 weakdef.c 对应的 relocTable 中找不到 foo 符号，因此 linker 返回“undefined reference for symbol foo”

$\"strongdef.c\"$
\n $\"weakdef.c\"$
\n $\"image\"$

请问这是正常的吗，我是否需要通过其它方法判断函数是否有定义，例如 symbolTable？

\n","createdAt":"2024-05-23 15:53:29.478383","updatedAt":"2024-05-23 15:53:29.478383","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":82,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":467,"username":"Impart","name":null,"avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":34166,"postNumber":2,"raw":"我发现两个文件的 SymbolTable 中有 foo 函数的符号表，所以要函数的强弱符号只能根据它们来判断是吗？\n![image|690x152](/uploads/image/58/84/58846fc4da5d7db5ccd9f3163e4997e71145f983285a51a7a01025af8510317b.avif)","cooked":"

我发现两个文件的 SymbolTable 中有 foo 函数的符号表，所以要函数的强弱符号只能根据它们来判断是吗？
\n $\"image\"$

\n","createdAt":"2024-05-23 15:57:48.22003","updatedAt":"2024-05-23 15:57:48.22003","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":42,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":467,"username":"Impart","name":null,"avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":34171,"postNumber":3,"raw":"定义是不会进入 relocTable 的，只有引用才会。\nweakdef.c 没有引用 foo，所以自然不需要对 foo 符号进行重定向，relocTable 中也就没有 foo 符号。","cooked":"

定义是不会进入 relocTable 的，只有引用才会。
\nweakdef.c 没有引用 foo，所以自然不需要对 foo 符号进行重定向，relocTable 中也就没有 foo 符号。

\n","createdAt":"2024-05-23 16:35:01.186512","updatedAt":"2024-05-23 16:37:34.187992","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":49,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":3285,"username":"platypus","name":"platypus","avatarUrl":"/uploads/image/8d/c9/8dc95eb138bc6d59e76c2244407a8c6ae1f8cf33049c520cabbde1e4145f38ac.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":3,"hasUrlPostNumber":true}