Forum: Redcloth Can't install RedCloth gem, fails to compile

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Hi there,

I'm trying to install the RedCloth gem on my Arch Linux (64bit) system,
but hadn't had success yet, RedCloth doesn't seem to compile. Here's the
installation output:

======================================
$ LANG=en_US.utf8 sudo gem install RedCloth
Building native extensions.  This could take a while...
ERROR:  Error installing RedCloth:
  ERROR: Failed to build gem native extension.

        /opt/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for main() in -lc... yes
creating Makefile

make
gcc -I. -I/opt/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/x86_64-linux
- -I/opt/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/ruby/backward
- -I/opt/rubies/ruby-1.9.2-p180/include/ruby-1.9.1 -I.   -fPIC -O3 -ggdb
- -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith
- -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long  -fPIC
- -O0 -Wall -Werror  -o redcloth_inline.o -c redcloth_inline.c
ragel/redcloth_inline.c.rl: In function ‘red_block’:
ragel/redcloth_inline.c.rl:99:9: error: variable ‘attr_regs’ set but not
used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

make: *** [redcloth_inline.o] Error 1


Gem files will remain installed in
/opt/rubies/ruby-1.9.2-p180/lib/ruby/gems/1.9.1/gems/RedCloth-4.2.7 for
inspection.
Results logged to
/opt/rubies/ruby-1.9.2-p180/lib/ruby/gems/1.9.1/gems/RedCloth-4.2.7/ext/redcloth_scan/gem_make.out
======================================

Here's the content of the gem_make.out file:

=======================================
$ cat
/opt/rubies/ruby-1.9.2-p180/lib/ruby/gems/1.9.1/gems/RedCloth-4.2.7/ext/redcloth_scan/gem_make.out
/opt/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for main() in -lc... yes
creating Makefile

make
gcc -I. -I/opt/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/x86_64-linux
- -I/opt/rubies/ruby-1.9.2-p180/include/ruby-1.9.1/ruby/backward
- -I/opt/rubies/ruby-1.9.2-p180/include/ruby-1.9.1 -I.   -fPIC -O3 -ggdb
- -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith
- -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long  -fPIC
- -O0 -Wall -Werror  -o redcloth_inline.o -c redcloth_inline.c
ragel/redcloth_inline.c.rl: In function ‘red_block’:
ragel/redcloth_inline.c.rl:99:9: error: variable ‘attr_regs’ set but not
used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

make: *** [redcloth_inline.o] Error 1
=======================================

And here's some information about my setup:

=======================================
√ quintus@hades => ~
$ ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux]
√ quintus@hades => ~
$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.4
  - RUBY VERSION: 1.9.2 (2011-02-18 patchlevel 180) [x86_64-linux]
  - INSTALLATION DIRECTORY: 
/opt/rubies/ruby-1.9.2-p180/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: /opt/rubies/ruby-1.9.2-p180/bin/ruby
  - EXECUTABLE DIRECTORY: /opt/rubies/ruby-1.9.2-p180/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /opt/rubies/ruby-1.9.2-p180/lib/ruby/gems/1.9.1
     - /home/quintus/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "install" => "--format-executable"
     - "update" => "--format-executable"
     - "rdoc" => "--format=hanna"
  - REMOTE SOURCES:
     - http://rubygems.org/
√ quintus@hades => ~
$ LANG=en_US.utf8 gcc --version
gcc (GCC) 4.6.0 20110513 (prerelease)
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is 
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.

√ quintus@hades => ~
$ uname -a
Linux hades 2.6.38-ARCH #1 SMP PREEMPT Fri May 13 09:24:47 CEST 2011
x86_64 AMD Athlon(tm) II X4 640 Processor AuthenticAMD GNU/Linux
√ quintus@hades => ~
$
=======================================

It seems that RedCloth's Makefile instructs GCC to treat warnings as
errors (as it can be seen in the build output) and then a warnings
occurs during compilation, causing GCC to abort compilation.
Is there any way to ignore this restriction?

Valete,
Marvin
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Yes, this has been an issue for me as well.

I've generally ignored this by forcing my Gemfile in Rails to use 4.2.3,
which is obviously a less than ideal, but usable workaround.

Jase.

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Am 28.05.2011 00:43, schrieb Jase:
> Yes, this has been an issue for me as well.
>
> I've generally ignored this by forcing my Gemfile in Rails to use 4.2.3,
> which is obviously a less than ideal, but usable workaround.
>
> Jase.

Thanks, version 4.2.3 compiles as expected:

=======================================================
√ quintus@hades => ~
$ sudo gem install RedCloth -v 4.2.3
Passwort:
Fetching: RedCloth-4.2.3.gem (100%)
Building native extensions.  This could take a while...
Successfully installed RedCloth-4.2.3
1 gem installed
Installing ri documentation for RedCloth-4.2.3...
Installing RDoc documentation for RedCloth-4.2.3...
√ quintus@hades => ~
$
=======================================================

I've just seen that the issue has already been reported on RedCloth's
issue tracker at
http://jgarber.lighthouseapp.com/projects/13054/ti...
, so hopefully it gets fixed in a future version (easiest maybe not to
use -Werror?).

Thanks again!

Vale,
Marvin
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