On Jan 20, 7:15     
>
> Can you point me to the extconf.rb file of RMagick?
>
> There is room definitely there is room to add more customization, but
> I basedrake-compilerstructure in the PickAxe.
>
> Please let me know if you make progress on this.

Thanks for your prompt reply, Luis. With the exception of the .so
filename I believe rake-compiler is working normally.

The extconf.rb for RMagick is below.

I recognize that rake-compiler wants "convention-over-configuration"
and that this can make it difficult to "import" existing projects,
especially those that don't match the convention. I appreciate your
patience.

Indeed, changing the name of the directory to RMagick2 causes rake-
compiler to know that the name of the .so file is RMagick2.so, at the
cost of changing the name of the directory. The directory structure,
which I based on setup.rb, has been my convention from the beginning
and I prefer not to change it. I believe that it is compatible with
the Pickaxe convention.

RMagick has both a Ruby part and a binary part. The Ruby part is
RMagick.rb and the binary part is RMagick2.so for RMagick 2 and simply
RMagick.so for RMagick 1.



require "mkmf"
require "date"

RMAGICK_VERS = "0.0.0"
MIN_RUBY_VERS = "1.8.2"
MIN_RUBY_VERS_NO = MIN_RUBY_VERS.tr(".","").to_i
MIN_IM_VERS = "6.3.0"
MIN_IM_VERS_NO = MIN_IM_VERS.tr(".","").to_i



# Test for a specific value in an enum type
def have_enum_value(enum, value, headers=nil, &b)
  checking_for "#{enum}.#{value}" do
    if try_compile(<<"SRC", &b)
#{COMMON_HEADERS}
#{cpp_include(headers)}
/*top*/
int main() { #{enum} t = #{value}; t = t; return 0; }
SRC
      $defs.push(format("-DHAVE_ENUM_%s", value.upcase))
      true
    else
      false
    end
  end
end




# Test for multiple values of the same enum type
def have_enum_values(enum, values, headers=nil, &b)
  values.each do |value|
    have_enum_value(enum, value, headers, &b)
  end
end




def exit_failure(msg)
  Logging::message msg
  message msg+"\n"
  exit(1)
end




# Seems like lots of people have multiple versions of ImageMagick
installed.
def check_multiple_imagemagick_versions()
   versions = []
   path = ENV['PATH'].split(File::PATH_SEPARATOR)
   path.each do |dir|
      file = File.join(dir, "Magick-config")
      if File.executable? file
         vers = `#{file} --version`.chomp.strip
         prefix = `#{file} --prefix`.chomp.strip
         versions << [vers, prefix, dir]
      end
   end
   versions.uniq!
   if versions.size > 1
      msg = "\nWarning: Found more than one ImageMagick installation.
This could cause problems at runtime.\n"
      versions.each do |vers, prefix, dir|
         msg << "         #{dir}/Magick-config reports version #{vers}
is installed in #{prefix}\n"
      end
      msg << "Using #{versions[0][0]} from #{versions[0][1]}.\n\n"
      Logging::message msg
      message msg
   end
end




if RUBY_PLATFORM =~ /mswin/
  abort <<END_MSWIN
+----------------------------------------------------------------------------
+
| This rmagick gem is for use only on Linux, BSD, OS X, and similar
systems  |
| that have a gnu or similar toolchain installed. The rmagick-win32
gem is a |
| pre-compiled version of RMagick bundled with ImageMagick for use
on        |
| Microsoft Windows systems. The rmagick-win32 gem is available on
RubyForge.|
| See http://rmagick.rubyforge.org/install-faq.html for more
information.    |
+----------------------------------------------------------------------------
+
END_MSWIN
end




unless checking_for("Ruby version >= #{MIN_RUBY_VERS}") do
  version = RUBY_VERSION.tr(".","").to_i
  version >= MIN_RUBY_VERS_NO
end
  exit_failure "Can't install RMagick #{RMAGICK_VERS}. Ruby #
{MIN_RUBY_VERS} or later required.\n"
end




# Magick-config is not available on Windows
if RUBY_PLATFORM !~ /mswin/

  # Check for compiler. Extract first word so ENV['CC'] can be a
program name with arguments.
  cc = (ENV["CC"] or Config::CONFIG["CC"] or "gcc").split(' ').first
  unless find_executable(cc)
    exit_failure "No C compiler found in ${ENV['PATH']}. See mkmf.log
for details."
  end

  # Check for Magick-config
  unless find_executable("Magick-config")
    exit_failure "Can't install RMagick #{RMAGICK_VERS}. Can't find
Magick-config in #{ENV['PATH']}\n"
  end

  check_multiple_imagemagick_versions()

  # Ensure minimum ImageMagick version
  unless checking_for("ImageMagick version >= #{MIN_IM_VERS}")  do
    version = `Magick-config --version`.chomp.tr(".","").to_i
    version >= MIN_IM_VERS_NO
  end
    exit_failure "Can't install RMagick #{RMAGICK_VERS}. You must have
ImageMagick #{MIN_IM_VERS} or later.\n"
  end

  $magick_version = `Magick-config --version`.chomp

  # Ensure ImageMagick is not configured for HDRI
  unless checking_for("HDRI disabled version of ImageMagick") do
    not (`Magick-config --version`["HDRI"])
  end
    exit_failure "\nCan't install RMagick #{RMAGICK_VERS}."+
           "\nRMagick does not work when ImageMagick is configured for
High Dynamic Range Images."+
           "\nDon't use the --enable-hdri option when configuring
ImageMagick.\n"
  end

  # Save flags
  $CFLAGS     = ENV["CFLAGS"].to_s   + " " + `Magick-config --
cflags`.chomp
  $CPPFLAGS   = ENV["CPPFLAGS"].to_s + " " + `Magick-config --
cppflags`.chomp
  $LDFLAGS    = ENV["LDFLAGS"].to_s  + " " + `Magick-config --
ldflags`.chomp
  $LOCAL_LIBS = ENV["LIBS"].to_s     + " " + `Magick-config --
libs`.chomp

else  # mswin

  `convert -version` =~ /Version: ImageMagick (\d\.\d\.\d+)-\d /
  abort "Unable to get ImageMagick version" unless $1
  $magick_version = $1
  $CFLAGS = "-W3"
  $CPPFLAGS = %Q{-I"C:\\Program Files\\Microsoft Platform SDK for
Windows Server 2003 R2\\Include" -I"C:\\Program Files\\ImageMagick-#
{$magick_version}-Q8\\include"}
  # The /link option is required by the Makefile but causes warnings
in the mkmf.log file.
  $LDFLAGS = %Q{/link /LIBPATH:"C:\\Program Files\\Microsoft Platform
SDK for Windows Server 2003 R2\\Lib" /LIBPATH:"C:\\Program Files\
\ImageMagick-#{$magick_version}-Q8\\lib" /LIBPATH:"C:\\ruby\\lib"}
  $LOCAL_LIBS = 'CORE_RL_magick_.lib X11.lib'

end



#headers = %w{assert.h ctype.h errno.h float.h limits.h math.h
stdarg.h stddef.h stdint.h stdio.h stdlib.h string.h time.h}
headers = %w{assert.h ctype.h stdio.h stdlib.h math.h time.h}
headers << "stdint.h" if have_header("stdint.h")  # defines uint64_t
headers << "sys/types.h" if have_header("sys/types.h")


unless have_header("magick/MagickCore.h")
  exit_failure "Can't install RMagick #{RMAGICK_VERS}. Can't find
MagickCore.h.\n"
else
  headers << "magick/MagickCore.h"
end


if RUBY_PLATFORM !~ /mswin/

  unless have_library("Magick", "InitializeMagick", headers) ||
have_library("MagickCore", "InitializeMagick", headers) || have_library
("Magick++", "InitializeMagick")
    exit_failure "Can't install RMagick #{RMAGICK_VERS}. " +
           "Can't find the ImageMagick library or one of the dependent
libraries. " +
           "Check the mkmf.log file for more detailed information.\n"
  end
end


have_func("snprintf", headers)


  ["AcquireQuantumMemory",           # 6.3.5-9
   "AcquireImage",                   # 6.4.1
   "AffinityImage",                  # 6.4.3-6
   "AffinityImages",                 # 6.4.3-6
   "ClutImageChannel",               # 6.3.5-8
   "CompositeLayers",                # 6.3.3-?
   "ConvertHSLToRGB",                # 6.3.5-9
   "ConvertRGBToHSL",                # 6.3.5-9
   "DeskewImage",                    # 6.4.2-5
   "DistortImage",                   # 6.3.5
   "EncipherImage",                  # 6.3.8-6
   "EqualizeImageChannel",           # 6.3.6-9
   "ExcerptImage",                   # 6.3.5-8
   "ExtentImage",                    # 6.3.1
   "FloodfillPaintImage",            # 6.3.7
   "GetAuthenticPixels",             # 6.4.5-6
   "GetImageAlphaChannel",           # 6.3.9-2
   "GetImageProperty",               # 6.3.1
   "GetNextImageProperty",           # 6.3.1
   "GetStringInfoDatum",             # 6.3.2
   "GetVirtualPixels",               # 6.4.5-6
   "InterpretImageProperties",       # 6.3.2
   "IsHistogramImage",               # 6.3.5
   "LevelImageColors",               # 6.4.2
   "LevelizeImageChannel",           # 6.4.2
   "LinearStretchImage",             # 6.3.1
   "LiquidRescaleImage",             # 6.3.8-2
   "MagickCoreGenesis",              # 6.3.4
   "OpaquePaintImageChannel",        # 6.3.7-10
   "PolaroidImage",                  # 6.3.1-6
   "RecolorImage",                   # 6.3.1-3
   "RemapImage",                     # 6.4.4-0
   "RemoveImageArtifact",            # 6.3.6
   "ResetImagePage",                 # 6.3.3
   "ResizeQuantumMemory",            # 6.3.5-9
   "SetImageAlphaChannel",           # 6.3.6-9
   "SetImageArtifact",               # 6.3.6
   "SetImageMask",                   # 6.3.1
   "SetImageProperty",               # 6.3.1
   "SetImageRegistry",               # 6.3.4
   "SparseColorImage",               # 6.3.4-?
   "SyncImageProfiles",              # 6.3.2
   "SyncAuthenticPixels",            # 6.4.5-6
   "TransparentPaintImage",          # 6.3.7-10
   "TransparentPaintImageChroma"     # 6.4.5-6
   ].each do |func|
    have_func(func, headers)
  end




checking_for("QueryMagickColorname() new signature")  do
  if try_compile(<<"SRC")
#{COMMON_HEADERS}
#{cpp_include(headers)}
/*top*/
int main() {
  MagickBooleanType okay;
  Image *image;
  MagickPixelPacket *color;
  char *name;
  ExceptionInfo *exception;
  okay = QueryMagickColorname(image, color, SVGCompliance, name,
exception);
  return 0;
  }
SRC
    $defs.push("-DHAVE_NEW_QUERYMAGICKCOLORNAME")
    true
  else
    false
  end
end




have_struct_member("ImageInfo", "profile", headers)   # 6.3.2
have_struct_member("Image", "tile_offset", headers)   # 6.3.4
have_struct_member("Image", "type", headers)          # ???
have_struct_member("DrawInfo", "kerning", headers)    # 6.4.7-8
have_struct_member("DrawInfo", "interword_spacing", headers)   #
6.4.8-0
have_type("AlphaChannelType", headers)                # 6.3.5
have_type("DitherMethod", headers)                    # 6.4.2
have_type("ImageLayerMethod", headers)                # 6.3.6 replaces
MagickLayerMethod
have_type("SpreadMethod", headers)                    # 6.3.1
have_type("long double", headers)
#have_type("unsigned long long", headers)
#have_type("uint64_t", headers)
#have_type("__int64", headers)
#have_type("uintmax_t", headers)
#check_sizeof("unsigned long", headers)
#check_sizeof("Image *", headers)


have_enum_value("AlphaChannelType", "CopyAlphaChannel",
headers)             # 6.4.3-7
have_enum_value("ColorspaceType", "CMYColorspace",
headers)                  # 6.3.5
have_enum_values("CompositeOperator",
["ChangeMaskCompositeOp",              # 6.3.3
 
"LinearLightCompositeOp",             # 6.3.5
                                       "DivideCompositeOp"],
headers)        # 6.3.5
have_enum_values("CompressionType",
["DXT1Compression",                      # 6.3.9-3
 
"DXT3Compression",                      # 6.3.9-3
                                     "DXT5Compression"],
headers)            # 6.3.9-3
have_enum_values("DistortImageMethod",
["ArcDistortion",                     # 6.3.5-5
 
"BarrelDistortion",                  # 6.4.2-5
 
"BarrelInverseDistortion",           # 6.4.3-8
 
"DePolarDistortion",                 # 6.4.2-6
 
"PerspectiveProjectionDistortion",   # 6.3.5-9
 
"PolarDistortion",                   # 6.4.2-6
 
"PolynomialDistortion",              # 6.4.2-4
                                        "ShepardsDistortion"],
headers)      # 6.4.2-4
have_enum_value("DitherMethod", "NoDitherMethod",
headers)                   # 6.4.3
have_enum_values("FilterTypes",
["KaiserFilter",                             # 6.3.6
 
"WelshFilter",                              # 6.3.6-4
 
"ParzenFilter",                             # 6.3.6-4
 
"LagrangeFilter",                           # 6.3.7-2
 
"BohmanFilter",                             # 6.3.7-2
 
"BartlettFilter",                           # 6.3.7-2
                                 "SentinelFilter"],
headers)                 # 6.3.7-2
have_enum_value("InterpolatePixelMethod", "SplineInterpolatePixel",
headers) # 6.3.5
have_enum_values("InterlaceType",
["GIFInterlace",                           # 6.3.4
 
"JPEGInterlace",                           # 6.3.4
                                  "PNGInterlace"],
headers)                  # 6.3.4
have_enum_values("MagickEvaluateOperator",
["PowEvaluateOperator",           # 6.4.1-9
 
"LogEvaluateOperator",            # 6.4.2
 
"ThresholdEvaluateOperator",      # 6.4.3
 
"ThresholdBlackEvaluateOperator", # 6.4.3
 
"ThresholdWhiteEvaluateOperator", # 6.4.3
 
"GaussianNoiseEvaluateOperator",  # 6.4.3
 
"ImpulseNoiseEvaluateOperator",   # 6.4.3
 
"LaplacianNoiseEvaluateOperator", # 6.4.3
 
"MultiplicativeNoiseEvaluateOperator", # 6.4.3
 
"PoissonNoiseEvaluateOperator",   # 6.4.3
 
"UniformNoiseEvaluateOperator",   # 6.4.3
 
"CosineEvaluateOperator",         # 6.4.8-5
 
"SineEvaluateOperator",           # 6.4.8-5
 
"AddModulusEvaluateOperator"],    # 6.4.8-5
 
headers)
have_enum_values("MagickLayerMethod",
["OptimizeTransLayer",                 # 6.3.3-4
 
"RemoveDupsLayer",                    # 6.3.3-6
 
"RemoveZeroLayer",                    # 6.3.3-6
 
"CompositeLayer",                     # 6.3.3-6
                                       "OptimizeImageLayer"],
headers)       # 6.3.3-?
have_enum_values("ImageLayerMethod",
["FlattenLayer",                        # 6.3.6-2
 
"MergeLayer",                          # 6.3.6
 
"MosaicLayer",                         # 6.3.6-2
                                      "TrimBoundsLayer" ],
headers)          # 6.4.3-8
have_enum_value("MetricType", "MeanErrorPerPixelMetric",
headers)            # 6.3.4-?
have_enum_value("NoiseType", "RandomNoise",
headers)                         # 6.3.5-0
have_enum_value("SpreadMethod", "ReflectSpread",
headers)                    # 6.3.1
have_enum_values("VirtualPixelMethod",
["MaskVirtualPixelMethod",            # 6.3.3
 
"BlackVirtualPixelMethod",           # 6.3.5
 
"GrayVirtualPixelMethod",            # 6.3.5
 
"HorizontalTileVirtualPixelMethod",  # 6.4.2-6
 
"VerticalTileVirtualPixelMethod",    # 6.4.2-6
                                        "WhiteVirtualPixelMethod"],
headers) # 6.3.5


# Now test Ruby 1.9.0 features.
headers = ["ruby.h"]
if have_header("ruby/io.h")
   headers << "ruby/io.h"
else
   headers << "rubyio.h"
end

have_func("rb_frame_this_func", headers)



# Miscellaneous constants
$defs.push("-DRUBY_VERSION_STRING=\"ruby #{RUBY_VERSION}\"")
$defs.push("-DRMAGICK_VERSION_STRING=\"RMagick #{RMAGICK_VERS}\"")

create_header()
# Prior to 1.8.5 mkmf duplicated the symbols on the command line and
in the
# extconf.h header. Suppress that behavior by removing the symbol
array.
$defs = []

# Force re-compilation if the generated Makefile changed.
$config_h = "Makefile rmagick.h"

create_makefile("RMagick2")


SUMMARY = <<"END_SUMMARY"


#{"=" * 70}
#{DateTime.now.strftime("%a %d%b%y %T")}
This installation of RMagick #{RMAGICK_VERS} is configured for
Ruby #{RUBY_VERSION} (#{RUBY_PLATFORM}) and ImageMagick #
{$magick_version}
#{"=" * 70}


END_SUMMARY

Logging::message SUMMARY
message SUMMARY