在Cygwin上用RVM安裝Ruby時遇到問題

Question

我在Windows上，目前擁有Ruby v2.1.5，因為這是RailsInstaller附帶的。 但是，對於另一個項目，我需要降級到2.1.1，但我不確定如何降級。

我已經在Cygwin上安裝了rvm，嘗試執行rvm install 2.1.1時遇到了這些問題

Searching for binary rubies, this might take some time.
No binary rubies available for: cygwin/unknown/x86_64/ruby-2.1.1.
Continuing with compilation. Please read 'rvm help mount' to get more 
information on binary rubies.

和

Checking requirements for cygwin.
Installing requirements for cygwin.
Updating system.
Installing required packages: mingw64-i686-gcc, mingw64-x86_64-gcc.
Requirements installation successful.
Installing Ruby from source to: /home/K/.rvm/rubies/ruby-2.1.1, this may take a while depending on your cpu(s)...
ruby-2.1.1 - #downloading ruby-2.1.1, this may take a while depending on your connection...
ruby-2.1.1 - #extracting ruby-2.1.1 to /home/K/.rvm/src/ruby-2.1.1....
ruby-2.1.1 - #applying patch /home/K/.rvm/patches/ruby/2.1.1/libyaml.patch.
ruby-2.1.1 - #applying patch /home/K/.rvm/patches/ruby/changeset_r45225.diff.
ruby-2.1.1 - #applying patch /home/K/.rvm/patches/ruby/changeset_r45240.diff.
ruby-2.1.1 - #configuring....................................................
ruby-2.1.1 - #post-configuration..
ruby-2.1.1 - #compiling....................................................
Error running '__rvm_make -j4',
showing last 15 lines of /home/K/.rvm/log/1433355357_ruby-2.1.1/make.log
make[2]: Leaving directory '/home/K/.rvm/src/ruby-2.1.1/ext/-test-/printf'
exts.mk:109: recipe for target 'ext/-test-/printf/all' failed
make[1]: *** [ext/-test-/printf/all] Error 2
make[1]: *** Waiting for unfinished jobs....
installing default rational libraries
installing default recursion libraries
make[2]: Leaving directory '/home/K/.rvm/src/ruby-2.1.1/ext/-test-/postponed_job'
linking shared-object -test-/rational.so
linking shared-object -test-/recursion.so
make[2]: Leaving directory '/home/K/.rvm/src/ruby-2.1.1/ext/-test-/recursion'
make[2]: Leaving directory '/home/K/.rvm/src/ruby-2.1.1/ext/-test-/rational'
make[1]: Leaving directory '/home/K/.rvm/src/ruby-2.1.1'
uncommon.mk:180: recipe for target 'build-ext' failed
make: *** [build-ext] Error 2
++ return 2
There has been an error while running make. Halting the installation.

任何幫助，將不勝感激。 謝謝

Answer 1

您需要修補ruby soure代碼，以便可以在cygwin上編譯。 幸運的是，rvm支持現成的補丁！

創建一個名為cygwin.patch的文件，其內容如下：

--- /ext/-test-/printf/printf.c 2014-06-29 10:17:20.000000000 -0700
+++ /ext/-test-/printf/printf.c 2015-07-08 16:58:15.882479100 -0700
@@ -1,3 +1,4 @@
+#define __STRICT_ANSI__ /* avoid conflicting utoa */
#include <ruby.h>
#include <ruby/encoding.h>

現在，只需使用--patch參數執行rvm ，如下所示：

rvm install 2.2-head --patch cygwin.patch