在OSX Yosemite上是否破坏了libsasl2？ 缺少sasl_client_done
我在安装版本的libsasl2（Cyrus SASL）时遇到了一些麻烦。
特别是，似乎本地头文件和sasl_version报告版本2.1.26，但没有为全局函数sasl_client_done提供符号。
我很确定我应该有这个符号，因为：
- 它位于提供的sasl / sasl.h头文件中
- cyrsus sasl NEWS文件列出了“Implemented sasl_client_done（）/ sasl_server_done（）”作为2.1.24function
- 在约塞米蒂以外的任何地方都提供2.1.26
复制：
- 请注意下面的示例打印
- “impl：’Cyrus SASL’，版本：33619994，专业：2，未成年人：1，步骤：26”
- 在取消注释代码后，示例在具有相同库版本的Linux安装上编译和执行
未注释的代码在yosemite上产生链接错误
Undefined symbols for architecture x86_64: "_sasl_client_done", referenced from: _main in foo-072675.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) 使用以下命令调用编译器：
clang -Wall -Werror -lsasl2 -o foo foo.c -v
与clang -v：
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn) Target: x86_64-apple-darwin14.0.0 Thread model: posix "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.10.0 -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name foo.c -mrelocation-model pic -pic-level 2 -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 241.9 -v -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -Wall -Werror -fdebug-compilation-dir /Users/jcarey/work -ferror-limit 19 -fmessage-length 0 -stack-protector 1 -mstackrealign -fblocks -fobjc-runtime=macosx-10.10.0 -fencode-extended-block-signature -fdiagnostics-show-option -vectorize-slp -o /var/folders/wq/jypwqgv976n0db5l5qxw900r0000gq/T/foo-92054e.o -xc foo.c clang -cc1 version 6.0 based upon LLVM 3.5svn default target x86_64-apple-darwin14.0.0 ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/local/include" ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/Library/Frameworks" #include "..." search starts here: #include search starts here: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/include /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks (framework directory) End of search list. "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.10.0 -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -o foo -lsasl2 /var/folders/wq/jypwqgv976n0db5l5qxw900r0000gq/T/foo-92054e.o -lSystem /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/lib/darwin/libclang_rt.osx.a Undefined symbols for architecture x86_64: "_sasl_client_done", referenced from: _main in foo-92054e.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
以及有问题的代码：
#include #include #include int main(int argc, char ** argv) { const char *impl; int version; uint32_t buf; uint16_t major; uint8_t minor; uint8_t step; sasl_version(&impl, &version); buf = version; major = buf >> 24; minor = (buf <> 24; step = (buf <> 24; printf("impl: '%s', version: %d, major: %d, minor: %d, step: %d\n", impl, version, major, minor, step); /* { int (* scd)(void); scd = &sasl_client_done; printf("sasl_client_done: %p\n", scd); } */ return 0; }
我认为cyrus sasl为优胜美地打包的方式有些麻烦（使用来自小牛队的符号列表？）。
感兴趣的是，我刚用10.10.4检查过，我看到符号现在在那里：
$ nm /usr/lib/libsasl2.dylib | grep sasl_client_done 000000000000724a T _sasl_client_done
示例代码现在工作正常（注释部分现在取消注释）。 仍然返回相同的Cyrus SASL版本：
impl：'Cyrus SASL'，版本：33619994，专业：2，未成年人：1，步骤：26 sasl_client_done：0x7fff8e3dc24a