在mac下面用npm安装bcrypt这个库的时候提示失败，失败信息如下：
$ sudo npm install bcrypt > fsevents@0.3.8 install /Users/chenjiebin/Sites/meiqu/meiquapi/node_modules/fsevents > node-gyp rebuild SOLINK_MODULE(target) Release/.node ld: library not found for -lgcc_s.10.5 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Release/.node] Error 1 gyp ERR! build error gyp ERR! stack Error: `make` failed with exit code: 2 gyp ERR! stack at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:276:23) gyp ERR! stack at ChildProcess.EventEmitter.emit (events.js:98:17) gyp ERR! stack at Process.ChildProcess._handle.onexit (child_process.js:784:12) gyp ERR! System Darwin 14.5.0 gyp ERR! command "node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild" gyp ERR! cwd /Users/chenjiebin/Sites/meiqu/meiquapi/node_modules/fsevents gyp ERR! node -v v0.10.4 gyp ERR! node-gyp -v v3.3.1 gyp ERR! not ok npm WARN install:fsevents@0.3.8 fsevents@0.3.8 install: `node-gyp rebuild` npm WARN install:fsevents@0.3.8 Exit status 1 > bcrypt@0.8.0 install /Users/chenjiebin/Sites/meiqu/meiquapi/node_modules/bcrypt > node-gyp rebuild CXX(target) Release/obj.target/bcrypt_lib/src/blowfish.o CXX(target) Release/obj.target/bcrypt_lib/src/bcrypt.o CXX(target) Release/obj.target/bcrypt_lib/src/bcrypt_node.o SOLINK_MODULE(target) Release/bcrypt_lib.node ld: library not found for -lgcc_s.10.5 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Release/bcrypt_lib.node] Error 1 gyp ERR! build error gyp ERR! stack Error: `make` failed with exit code: 2 gyp ERR! stack at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:276:23) gyp ERR! stack at ChildProcess.EventEmitter.emit (events.js:98:17) gyp ERR! stack at Process.ChildProcess._handle.onexit (child_process.js:784:12) gyp ERR! System Darwin 14.5.0 gyp ERR! command "node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild" gyp ERR! cwd /Users/chenjiebin/Sites/meiqu/meiquapi/node_modules/bcrypt gyp ERR! node -v v0.10.4 gyp ERR! node-gyp -v v3.3.1 gyp ERR! not ok npm WARN meiqu@0.1.0 No repository field. npm WARN meiqu@0.1.0 No license field. npm ERR! Darwin 14.5.0 npm ERR! argv "node" "/usr/local/bin/npm" "install" "bcrypt" npm ERR! node v0.10.4 npm ERR! npm v3.8.6 npm ERR! code ELIFECYCLE npm ERR! bcrypt@0.8.0 install: `node-gyp rebuild` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the bcrypt@0.8.0 install script 'node-gyp rebuild'. npm ERR! Make sure you have the latest version of node.js and npm installed. npm ERR! If you do, this is most likely a problem with the bcrypt package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! node-gyp rebuild npm ERR! You can get information on how to open an issue for this project with: npm ERR! npm bugs bcrypt npm ERR! Or if that isn't available, you can get their info via: npm ERR! npm owner ls bcrypt npm ERR! There is likely additional logging output above. npm ERR! Please include the following file with any support request: npm ERR! /Users/chenjiebin/Sites/meiqu/meiquapi/npm-debug.log
从信息来看是重新构建node-gyp的时候报出了错误，仔细观察报错信息，后来注意到这行：
ld: library not found for -lgcc_s.10.5
这种信息一般都是指库没有找到，网上搜索相关信息都和xcode有关。印象里前一段时间是可以的，也没这个错误。后来想到会不会是前一段时间升级了xcode导致的。
于是尝试在电脑上搜索libgcc_s这个相关的库：
$ sudo find / -name '*libgcc_s*' /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libgcc_s.1.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.1.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.4.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.5.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.1.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.10.4.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.10.5.dylib find: /dev/fd/3: Not a directory find: /dev/fd/4: Not a directory /usr/lib/libgcc_s.1.dylib /usr/lib/libgcc_s.10.4.tbd /usr/lib/libgcc_s.10.5.tbd
发现电脑中存在这样的库：
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.10.5.dylib
猜测应该是这个库，于是尝试在/usr/local/lib/目录做了个软链接到这个库
$ cd /usr/local/lib/ $ ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.5.dylib libgcc_s.10.5.dylib
再次尝试安装bcrypt就顺利通过了。估计是上次升级xcode的时候库的位置被做了调整，导致npm找不到了。
转载请注明：快乐编程 » mac npm安装bcrypt失败ld: library not found for -lgcc_s.10.5
