dyld：找不到符號：_ERR_remove_thread_state

Question

我想通過here運行make_torrent示例代碼提供。

我已經編譯和基於什麼寫在here

這裏安裝libtorrent我是如何遵守和鏈接的make_torrent.cc文件。

g++ -g -Wall make_torrent.cc -ltorrent-rasterbar -lboost_system -o make_torrent 

在運行make_torrent示例代碼我看到這個

usage: make_torrent FILE [OPTIONS] 

Generates a torrent file from the specified file 
or directory and writes it to standard out 

OPTIONS: 
-m file  generate a merkle hash tree torrent. 
       merkle torrents require client support 
       the resulting full merkle tree is written to 
       the specified file 
-w url  adds a web seed to the torrent with 
       the specified url 
-t url  adds the specified tracker to the 
       torrent. For multiple trackers, specify more 
       -t options 
-c comment sets the comment to the specified string 
-C creator sets the created-by field to the specified string 
-p bytes  enables padding files. Files larger 
       than bytes will be piece-aligned 
-s bytes  specifies a piece size for the torrent 
       This has to be a multiple of 16 kiB 
-l   Don't follow symlinks, instead encode them as 
       links in the torrent file 
-o file  specifies the output filename of the torrent file 
       If this is not specified, the torrent file is 
       printed to the standard out, except on windows 
       where the filename defaults to a.torrent 
-r file  add root certificate to the torrent, to verify 
       the HTTPS tracker 
-S info-hash add a similar torrent by info-hash. The similar 
       torrent is expected to share some files with this one 
-L collection add a collection name to this torrent. Other torrents 
       in the same collection is expected to share files 
       with this one. 
-M   make the torrent compatible with mutable torrents 
       this means aligning large files and pad them in order 
       for piece hashes to uniquely indentify a file without 
       overlap 
dyld: lazy symbol binding failed: Symbol not found: _ERR_remove_thread_state 
    Referenced from: /usr/local/lib/libtorrent-rasterbar.9.dylib 
    Expected in: flat namespace 

dyld: Symbol not found: _ERR_remove_thread_state 
    Referenced from: /usr/local/lib/libtorrent-rasterbar.9.dylib 
    Expected in: flat namespace 

我知道我必須提供相關參數，使洪流，但我不知道爲什麼libtorrent抱怨鏈接

g++ --version 
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 
Apple LLVM version 8.0.0 (clang-800.0.42.1) 
Target: x86_64-apple-darwin16.4.0 
Thread model: posix 
InstalledDir: /Library/Developer/CommandLineTools/usr/bin 

任何線索？

Answer 1

這是由於未正確鏈接到openssl而導致的。我假設你在OSX上，在默認安裝路徑中有一箇舊版本的openssl。

我建議安裝openssl與brew install openssl。請注意，這需要您安裝了自制軟件。 完成此操作後，請將brew openssl和brew看成線條，告訴您要將什麼添加到LDFLAGS和CPPFLAGS。在我的情況：

For compilers to find this software you may need to set: 
    LDFLAGS: -L/usr/local/opt/openssl/lib 
    CPPFLAGS: -I/usr/local/opt/openssl/include 
For pkg-config to find this software you may need to set: 
    PKG_CONFIG_PATH: /usr/local/opt/openssl/lib/pkgconfig 

所以在我的情況，我會再與編譯：

g++ -g -Wall -L/usr/local/opt/openssl/lib -I/usr/local/opt/openssl/include make_torrent.cc -ltorrent-rasterbar -lboost_system -o make_torrent 

如果這樣做不行，我還要確保你編譯libtorrent時，包括這些標誌。