[ruby/fiddle] Add support for linker script on Linux

GitHub: fix https://github.com/ruby/fiddle/pull/107

Reported by nicholas a. evans. Thanks!!!

https://github.com/ruby/fiddle/commit/49ea1490df

1 files changed, 30 insertions, 1 deletions

diff --git a/ext/fiddle/lib/fiddle.rb b/ext/fiddle/lib/fiddle.rb
index 09262c43ff..6137c487c6 100644
--- a/ext/fiddle/lib/fiddle.rb
+++ b/ext/fiddle/lib/fiddle.rb
@@ -58,7 +58,36 @@ module Fiddle
   #
   # See Fiddle::Handle.new for more.
   def dlopen library
-    Fiddle::Handle.new library
+    begin
+      Fiddle::Handle.new(library)
+    rescue DLError => error
+      case RUBY_PLATFORM
+      when /linux/
+        case error.message
+        when /\A(\/.+?): (?:invalid ELF header|file too short)/
+          # This may be a linker script:
+          # https://sourceware.org/binutils/docs/ld.html#Scripts
+          path = $1
+        else
+          raise
+        end
+      else
+        raise
+      end
+
+      File.open(path) do |input|
+        input.each_line do |line|
+          case line
+          when /\A\s*(?:INPUT|GROUP)\s*\(\s*([^\s,\)]+)/
+            # TODO: Should we support multiple files?
+            return dlopen($1)
+          end
+        end
+      end
+
+      # Not found
+      raise
+    end
   end
   module_function :dlopen