{"topic":{"id":12722,"title":"test4 提问","slug":"topic","userId":1544,"categoryId":58,"createdAt":"2024-05-27 05:07:57.341428","bumpedAt":"2024-05-28 13:39:04.281884","views":251,"postsCount":2,"highestPostNumber":2,"likeCount":0,"closed":false,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"对于test4给出的测试，我运行并打印一些结果后发现在我的RelocEntry中只有一个foo（正常情况一个是一个强符号 foo 和一个 undef 的 foo），且其符号类型是 undef（既没有加入到强符号 map，也没有加入到弱符号 map），为什么我的强符号 foo 不见了，始终报undefined reference for symbol foo的错误。","deletedAt":null,"isAnonymous":false,"isPrivate":false,"isMembersOnly":false,"category":{"id":58,"name":"计算机系统导论","slug":"ics","color":"3AB54A"},"author":{"id":1544,"username":"liwan3","name":"joker","avatarUrl":null},"realAuthor":{"id":1544,"username":"liwan3","name":"joker","avatarUrl":null},"tags":[]},"posts":[{"id":34453,"postNumber":1,"raw":"对于**test4**给出的测试，我运行并打印一些结果后发现在我的**RelocEntry**中只有一个**foo**（正常情况一个是一个强符号 foo 和一个 undef 的 foo），且其符号类型是 undef（既没有加入到强符号 map，也没有加入到弱符号 map），为什么我的强符号 foo 不见了，始终报`undefined reference for symbol foo`的错误。\n![image|566x281](/uploads/image/bc/47/bc47ed0b14d32c6b46615f5b4e75de882ca888ca75bdedb0de17dc6a9d23afc9.avif)","cooked":"

对于test4给出的测试，我运行并打印一些结果后发现在我的RelocEntry中只有一个foo（正常情况一个是一个强符号 foo 和一个 undef 的 foo），且其符号类型是 undef（既没有加入到强符号 map，也没有加入到弱符号 map），为什么我的强符号 foo 不见了，始终报undefined reference for symbol foo的错误。
\n $\"image\"$

\n","createdAt":"2024-05-27 05:07:57.45164","updatedAt":"2024-05-27 08:23:22.964827","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":105,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":4,"publicVersion":4,"deletedAt":null,"isAnonymous":false,"user":{"id":1544,"username":"liwan3","name":"joker","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":34518,"postNumber":2,"raw":"可以使用`readelf -r`检查两个目标文件的重定位条目：\n![image|690x366](/uploads/image/34/58/3458bdb161a4885effd62d1dc66956550de3d905b1aa6ce56abddbb1b2f1abd6.avif)\n\n发现在 `weakdef`里没有对`foo`的重定位，但`strongdef` 里有。\n\n但二者的符号表里都有 `foo`，一个是有定义而另一个没有：\n![image|558x500](/uploads/image/c4/7b/c47b18ad7e6470c789a4eb6fda909a62f3bad9466502be0af1a49bb2f1a97ce5.avif)\n\n所以我猜你应该参考的是 `relocTable` 而不是`symbolTable`？","cooked":"

可以使用readelf -r检查两个目标文件的重定位条目：
\n $\"image\"$

发现在 weakdef里没有对foo的重定位，但strongdef 里有。

但二者的符号表里都有 foo，一个是有定义而另一个没有：
\n $\"image\"$

所以我猜你应该参考的是 relocTable 而不是symbolTable？

\n","createdAt":"2024-05-28 13:39:04.281884","updatedAt":"2024-05-28 13:39:04.281884","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":3625,"username":"yhdang","name":"yhdang","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":2,"hasUrlPostNumber":true}