glu: new virtual package; openglu: new package (#7162)

* mesa-glu: now provides 'glu' (GL Utility library)

* openglu: add package, provides glu

* openglu: add custom fetcher, remove nonsense url

Change openglu package to look like the opengl package in GitHub PR

* [OpenGLU] Fix a typo

2 files changed, 88 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/mesa-glu/package.py b/var/spack/repos/builtin/packages/mesa-glu/package.py
index 9d8125242e..608a23cd8b 100644
--- a/var/spack/repos/builtin/packages/mesa-glu/package.py
+++ b/var/spack/repos/builtin/packages/mesa-glu/package.py
@@ -37,3 +37,5 @@ class MesaGlu(AutotoolsPackage):
     variant('mesa', default=True,
        description='Usually depends on mesa, disable for accelerated OpenGL')
     depends_on('mesa', when='+mesa')
+
+    provides('glu@1.3')
diff --git a/var/spack/repos/builtin/packages/openglu/package.py b/var/spack/repos/builtin/packages/openglu/package.py
new file mode 100644
index 0000000000..a27441f901
--- /dev/null
+++ b/var/spack/repos/builtin/packages/openglu/package.py
@@ -0,0 +1,86 @@
+##############################################################################
+# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/spack/spack
+# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+from spack import *
+
+
+class Openglu(Package):
+    """Placeholder for external OpenGL utility library (GLU) from hardware
+       vendors"""
+
+    homepage = "https://www.opengl.org/resources/libraries"
+    url      = "https://www.opengl.org/resources/libraries"
+
+    # A second argument (usually the has) must be supplied to the
+    # version directive, but 'n/a' is used here because this package
+    # is a placeholder for a system/vendor installation of OpenGL
+    version('1.3', 'n/a')
+
+    provides('glu@:1.3', when='@1.3:')
+    provides('glu@:1.2', when='@1.2:')
+    provides('glu@:1.1', when='@1.1:')
+    provides('glu@:1.0', when='@1.0:')
+
+    # Override the fetcher method to throw a useful error message;
+    # fixes an issue similar to Github issue (#7061), in which the
+    # opengl package threw a generic, uninformative error message
+    # during the `fetch` step
+    @property
+    def fetcher(self):
+        msg = """This package is intended to be a placeholder for
+        system-provided OpenGL utility (GLU) libraries from hardware vendors.
+        Please download and install the GLU drivers/libraries for your
+        graphics hardware separately, and then set that up as an external
+        package.  An example of a working packages.yaml:
+
+        packages:
+          openglu:
+            paths:
+              openglu@1.3: /opt/opengl
+            buildable: False
+
+        In that case, /opt/opengl/ should contain these two folders:
+
+        include/GL/       (opengl headers, including "glu.h")
+        lib               (opengl libraries, including "libGLU.so")
+
+        On Apple Darwin (OS X, macOS) systems, this package is
+        normally installed as part of the XCode Command Line Tools in
+        /usr/X11R6, so a working packages.yaml would be
+
+        packages:
+          openglu:
+            paths:
+              openglu@1.3: /usr/X11R6
+            buildable: False
+
+        In that case, /usr/X11R6 should contain
+
+        include/GL       (GLU headers, including "glu.h")
+        lib              (GLU libraries, including "libGLU.dylib")"""
+
+        raise InstallError(msg)
+
+    def install(self, spec, prefix):
+        pass