libwebp: CMakePackage -> AutotoolsPackage (#14384)

var/spack/repos/builtin/packages/libwebp/package.py

@@ -6,14 +6,56 @@
 from spack import *
 
 
-class Libwebp(CMakePackage):
-    """
-    WebP is a modern image format that provides superior lossless and lossy
+class Libwebp(AutotoolsPackage):
+    """WebP is a modern image format that provides superior lossless and lossy
     compression for images on the web. Using WebP, webmasters and web
-    developers can create smaller, richer images that make the web faster.
-    """
+    developers can create smaller, richer images that make the web faster."""
 
     homepage = "https://developers.google.com/speed/webp/"
-    url      = "https://github.com/webmproject/libwebp/archive/v1.0.3.tar.gz"
+    url      = "https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.0.3.tar.gz"
 
     version('1.0.3', sha256='082d114bcb18a0e2aafc3148d43367c39304f86bf18ba0b2e766447e111a4a91')
+
+    variant('libwebpmux',     default=False, description='Build libwebpmux')
+    variant('libwebpdemux',   default=False, description='Build libwebpdemux')
+    variant('libwebpdecoder', default=False, description='Build libwebpdecoder')
+    variant('libwebpextras',  default=False, description='Build libwebpextras')
+
+    depends_on('automake', type='build')
+    depends_on('autoconf', type='build')
+    depends_on('libtool', type='build')
+    depends_on('m4', type='build')
+
+    def configure_args(self):
+        # TODO: add variants and dependencies for these
+        args = [
+            '--disable-gl',
+            '--disable-sdl',
+            '--disable-png',
+            '--disable-jpeg',
+            '--disable-tiff',
+            '--disable-gif',
+            '--disable-wic',
+        ]
+
+        if '+libwebpmux' in self.spec:
+            args.append('--enable-libwebpmux')
+        else:
+            args.append('--disable-libwebpmux')
+
+        if '+libwebpdemux' in self.spec:
+            args.append('--enable-libwebpdemux')
+        else:
+            args.append('--disable-libwebpdemux')
+
+        if '+libwebpdecoder' in self.spec:
+            args.append('--enable-libwebpdecoder')
+        else:
+            args.append('--disable-libwebpdecoder')
+
+        if '+libwebpextras' in self.spec:
+            args.append('--enable-libwebpextras')
+        else:
+            args.append('--disable-libwebpextras')
+
+        return args