Bug #11201: pkg_config NoMethodError when finding other -config program

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.3.0dev (2015-05-28 trunk 50658) [x86_64-linux]
• Backport: 2.0.0: WONTFIX, 2.1: DONE, 2.2: DONE

[Hanmac (Hans Mackowiak)]

where it does work (existing package)

pkg_config("gtk+-x11-2.0") #  => ["-pthread", "", "-lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype"] 
pkg_config("gtk+-x11-2.0", "version") # => "0.28" 

where it does work (non-existing package)

pkg_config("wx-bla", "version") # => nil 
pkg_config("wx-bla") #  => nil 

where it maybe not work (other (pkg)-config program)

pkg_config("wx", "version") # => "3.1.0" 

pkg_config("wx") #either should try to return the same stuff as pkg_config("gtk+-x11-2.0") if possible, or if not return nil

NoMethodError: undefined method `scan' for nil:NilClass
	from /usr/local/rvm/rubies/ruby-head/lib/ruby/2.3.0/shellwords.rb:73:in `shellsplit'
	from /usr/local/rvm/rubies/ruby-head/lib/ruby/2.3.0/mkmf.rb:1819:in `pkg_config'
	from (irb):11
	from /usr/local/rvm/rubies/ruby-head/bin/irb:11:in `<main>'

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Feedback

Does pkg-config --libs-only-l wx work?

[Hanmac (Hans Mackowiak)]

wx from wxWidgets does have its own wx-config script with does have other flags than pkg-config
(pkg-config in its second version can call (pkg)-config scripts)

thats why:

wx-config --libs-only-l
*** Error: Unrecognised option: '--libs-only-l'

imo it would be nice if it would have checked if that libs-only-l returns something/a string before shellsplit does try to cut it.

i am okay with it that pkg_config("wx") might not be able to get something but imo it would be better if it does return nil instead of NoMethodError
PS: but i think it still would have been nice if it would have been able to return something meaningful.

another sample would be xml2-config from libxml2

PS: i might try to fix that on my own and then i will add a patch

[nobu (Nobuyoshi Nakada)]

Thank you, does this patch work?

diff --git i/lib/mkmf.rb w/lib/mkmf.rb
index be9b06c..615e2dc 100644
--- i/lib/mkmf.rb
+++ w/lib/mkmf.rb
@@ -1818,11 +1818,15 @@ SRC
         cflags = get['cflags']
       end
       libs = get['libs-only-l']
-      ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
-      $CFLAGS += " " << cflags
-      $CXXFLAGS += " " << cflags
+      if cflags
+        $CFLAGS += " " << cflags
+        $CXXFLAGS += " " << cflags
+      end
+      if libs
+        ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
+        $libs += " " << libs
+      end
       $LDFLAGS = [orig_ldflags, ldflags].join(' ')
-      $libs += " " << libs
       Logging::message "package configuration for %s\n", pkg
       Logging::message "cflags: %s\nldflags: %s\nlibs: %s\n\n",
                        cflags, ldflags, libs

[Hanmac (Hans Mackowiak)]

• Priority changed from Normal to 3

i try to modify your possible patch a bit,
now it can parse the libs from the libflags again.

makes it work with wx-config and freetype-config

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 0f588a5..7e8b22d 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1816,11 +1816,18 @@ SRC
         cflags = get['cflags']
       end
       libs = get['libs-only-l']
-      ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
-      $CFLAGS += " " << cflags
-      $CXXFLAGS += " " << cflags
-      $LDFLAGS = [orig_ldflags, ldflags].join(' ')
+      if cflags
+        $CFLAGS += " " << cflags
+        $CXXFLAGS += " " << cflags
+      end
+      if libs
+        ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
+      else
+        libs, ldflags = Shellwords.shellwords(ldflags).partition {|s| s =~ /-l([^ ]+)/ }.map {|l| l.quote.join(" ") }
+      end
       $libs += " " << libs
+
+      $LDFLAGS = [orig_ldflags, ldflags].join(' ')
       Logging::message "package configuration for %s\n", pkg
       Logging::message "cflags: %s\nldflags: %s\nlibs: %s\n\n",
                        cflags, ldflags, libs

sdl2-config and xml2-config makes problems with "cflags-only-I" and "libs-only-l" because they do not return error so $?.success? does think the data is ok

[nobu (Nobuyoshi Nakada)]

• Status changed from Feedback to Closed

Applied in changeset r50717.

---

mkmf.rb: split --libs

• lib/mkmf.rb (pkg_config): split --libs if --libs-only-l option
  is not available. patch in [ruby-core:69428] by Hans Mackowiak.
  [ruby-core:69421] [Bug #11201]

[usa (Usaku NAKAMURA)]

• Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: WONTFIX, 2.1: REQUIRED, 2.2: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 2.0.0: WONTFIX, 2.1: REQUIRED, 2.2: REQUIRED to 2.0.0: WONTFIX, 2.1: DONE, 2.2: REQUIRED

ruby_2_1 r51123 merged revision(s) 50717.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: WONTFIX, 2.1: DONE, 2.2: REQUIRED to 2.0.0: WONTFIX, 2.1: DONE, 2.2: DONE

Backported into ruby_2_2 branch at r51135.