安装 Xcode 4.2 后无法使用本机扩展构建 json (1.6.3)答案

【问题标题】：Failed to build json (1.6.3) with native extension after I installed Xcode 4.2安装 Xcode 4.2 后无法使用本机扩展构建 json (1.6.3)
【发布时间】：2012-02-20 02:47:25
【问题描述】：

你熟悉这个错误吗？我不知道如何解决这个问题：

Installing json (1.6.3) with native extensions  Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/boris/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb  creating Makefile

make /usr/bin/gcc-4.2 -I.
-I/Users/boris/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/x86_64-darwin10.8.0
-I/Users/boris/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward
-I/Users/boris/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long  -fno-common -pipe -O3 -Wall  -o parser.o -c parser.c make: /usr/bin/gcc-4.2: No such file or directory make: *** [parser.o] Error 1


Gem files will remain installed in /Users/boris/.rvm/gems/ruby-1.9.2-p290@apps2/gems/json-1.6.3 for inspection. Results logged to /Users/boris/.rvm/gems/ruby-1.9.2-p290@apps2/gems/json-1.6.3/ext/json/ext/parser/gem_make.out An error occured while installing json (1.6.3), and Bundler cannot continue. Make sure that `gem install json -v '1.6.3'` succeeds before bundling.

系统信息：

gem -v
1.8.10
$ ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]

Xcode v4.2.1

【问题讨论】：

标签： ruby unix build makefile gem

【解决方案1】：

makefile 引用 /usr/bin/gcc-4.2 ... 我通过创建指向正确可执行文件的符号链接解决了这个问题：

sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/gcc-4.2

【讨论】：

最好使用相对路径：sudo ln -s llvm-gcc-4.2 /usr/bin/gcc-4.2