优胜美地-SQLite3 gem安装错误-不支持C扩展

Question

I want to use SQLite3 in a jruby project.

gem install SQLite3

command fails with

Building native extensions.  This could take a while...
ERROR:  Error installing sqlite3:
    ERROR: Failed to build gem native extension.

    /Users/h1k3n/.rvm/rubies/jruby-9.0.0.0/bin/jruby -r ./siteconf20150809-4559-7o84f5.rb extconf.rb
NotImplementedError: C extensions are not supported
    <top> at /Users/h1k3n/.rvm/rubies/jruby-9.0.0.0/lib/ruby/stdlib/mkmf.rb:1
  require at org/jruby/RubyKernel.java:940
   (root) at /Users/h1k3n/.rvm/rubies/jruby-9.0.0.0/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
    <top> at extconf.rb:3

extconf failed, exit code 1

Gem files will remain installed in /Users/h1k3n/.rvm/gems/jruby-9.0.0.0/gems/sqlite3-1.3.10 for inspection.
Results logged to /Users/h1k3n/.rvm/gems/jruby-9.0.0.0/extensions/universal-java-1.8/2.2.0/sqlite3-1.3.10/gem_make.out

gcc version

which gcc => /usr/bin/gcc

trying to install SQLite3

brew instal SQLite3 => Warning: sqlite-3.8.11 already installed

SQLite3 version installed

which SQLite3 => ~/Android/sdk/platform-tools/sqlite3

i thinks this is the culprit. It probably points to the Android version of SQLite3 instead of a system one and that's why it fails to build the native extension.

Answer 1

You appear to be using JRuby , not the standard Ruby implementation, Ruby MRI .

The SQLite3 gem relies on Ruby C extensions, but unlike the standard implementation, JRuby does not support Ruby C extensions :

JRuby versions prior to 1.6 did not support Ruby C extensions, and even in 1.6 the support is still "in development" and considered experimental. As of 1.7, it has been disabled and will likely be removed .

The article above lists recommendations to alternative gems, including for SQLite3.