Reduce number of variants, just use system or no-system libs

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

@@ -42,25 +42,19 @@ class Cmake(Package):
     version('3.0.2',    'db4c687a31444a929d2fdc36c4dfb95f')
     version('2.8.10.2', '097278785da7182ec0aea8769d06860c')
 
-    variant('curl',    default=True,  description='Build external curl library')
-    variant('expat',   default=True,  description='Build external expat library')
-    # variant('jsoncpp', default=True, description='Build external jsoncpp library')  # NOQA: ignore=E501
-    variant('zlib',    default=True,  description='Build external zlib library')
-    variant('bzip2',   default=True,  description='Build external bzip2 library')
-    variant('xz',      default=True,  description='Build external lzma library')
-    variant('archive', default=True,  description='Build external archive library')
+    variant('ownlibs', default=False, description='Use CMake-provided third-party libraries')
     variant('qt',      default=False, description='Enables the build of cmake-gui')
     variant('doc',     default=False, description='Enables the generation of html and man page documentation')
     variant('openssl', default=True,  description="Enables CMake's OpenSSL features")
     variant('ncurses', default=True,  description='Enables the build of the ncurses gui')
 
-    depends_on('curl',           when='+curl')
-    depends_on('expat',          when='+expat')
-    # depends_on('jsoncpp',        when='+jsoncpp')  # circular dependency
-    depends_on('zlib',           when='+zlib')
-    depends_on('bzip2',          when='+bzip2')
-    depends_on('xz',             when='+xz')
-    depends_on('libarchive',     when='+archive')
+    depends_on('curl',           when='~ownlibs')
+    depends_on('expat',          when='~ownlibs')
+    # depends_on('jsoncpp',        when='~ownlibs')  # circular dependency
+    depends_on('zlib',           when='~ownlibs')
+    depends_on('bzip2',          when='~ownlibs')
+    depends_on('xz',             when='~ownlibs')
+    depends_on('libarchive',     when='~ownlibs')
     depends_on('qt',             when='+qt')
     depends_on('python@2.7.11:', when='+doc', type='build')
     depends_on('py-sphinx',      when='+doc', type='build')
@@ -92,22 +86,21 @@ def install(self, spec, prefix):
         # Consistency check
         self.validate(spec)
 
-        def variant_to_bool(variant):
-            return 'system' if variant in spec else 'no-system'
-
-        # configure, build, install:
         options = [
             '--prefix={0}'.format(prefix),
             '--parallel={0}'.format(make_jobs),
-            '--{0}-curl'.format(variant_to_bool('+curl')),
-            '--{0}-expat'.format(variant_to_bool('+expat')),
-            '--{0}-jsoncpp'.format(variant_to_bool('+jsoncpp')),
-            '--{0}-zlib'.format(variant_to_bool('+zlib')),
-            '--{0}-bzip2'.format(variant_to_bool('+bzip2')),
-            '--{0}-liblzma'.format(variant_to_bool('+xz')),
-            '--{0}-libarchive'.format(variant_to_bool('+archive'))
+            # jsoncpp requires CMake to build
+            # use CMake-provided library to avoid circular dependency
+            '--no-system-jsoncpp'
         ]
 
+        if '+ownlibs' in spec:
+            # Build and link to the CMake-provided third-party libraries
+            options.append('--no-system-libs')
+        else:
+            # Build and link to the Spack-installed third-party libraries
+            options.append('--system-libs')
+
         if '+qt' in spec:
             options.append('--qt-gui')
         else:

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

@@ -28,6 +28,7 @@
 class Libarchive(Package):
     """libarchive: C library and command-line tools for reading and
        writing tar, cpio, zip, ISO, and other archive formats."""
+
     homepage = "http://www.libarchive.org"
     url      = "http://www.libarchive.org/downloads/libarchive-3.1.2.tar.gz"
 
@@ -36,47 +37,19 @@ class Libarchive(Package):
     version('3.1.1', '1f3d883daf7161a0065e42a15bbf168f')
     version('3.1.0', '095a287bb1fd687ab50c85955692bf3a')
 
-    variant('zlib',    default=True, description='Build support for gzip through zlib')
-    variant('bzip2',   default=True, description='Build support for bzip2 through bz2lib')
-    variant('lzma',    default=True, description='Build support for lzma through lzmadec')
-    variant('lz4',     default=True, description='Build support for lz4 through liblz4')
-    variant('xz',      default=True, description='Build support for xz through lzma')
-    variant('lzo',     default=True, description='Build support for lzop through liblzo2')
-    variant('nettle',  default=True, description='Build with crypto support from Nettle')
-    variant('openssl', default=True, description='Build support for mtree and xar hashes through openssl')
-    variant('libxml2', default=True, description='Build support for xar through libxml2')
-    variant('expat',   default=True, description='Build support for xar through expat')
-
-    depends_on('zlib',    when='+zlib')
-    depends_on('bzip2',   when='+bzip2')
-    depends_on('lzma',    when='+lzma')
-    depends_on('lz4',     when='+lz4')
-    depends_on('xz',      when='+xz')
-    depends_on('lzo',     when='+lzo')
-    depends_on('nettle',  when='+nettle')
-    depends_on('openssl', when='+openssl')
-    depends_on('libxml2', when='+libxml2')
-    depends_on('expat',   when='+expat')
+    depends_on('zlib')
+    depends_on('bzip2')
+    depends_on('lzma')
+    depends_on('lz4')
+    depends_on('xz')
+    depends_on('lzo')
+    depends_on('nettle')
+    depends_on('openssl')
+    depends_on('libxml2')
+    depends_on('expat')
 
     def install(self, spec, prefix):
-        def variant_to_bool(variant):
-            return 'with' if variant in spec else 'without'
-
-        config_args = [
-            '--prefix={0}'.format(prefix),
-            '--{0}-zlib'.format(variant_to_bool('+zlib')),
-            '--{0}-bz2lib'.format(variant_to_bool('+bzip2')),
-            '--{0}-lzmadec'.format(variant_to_bool('+lzma')),
-            '--{0}-lz4'.format(variant_to_bool('+lz4')),
-            '--{0}-lzma'.format(variant_to_bool('+xz')),
-            '--{0}-lzo2'.format(variant_to_bool('+lzo')),
-            '--{0}-nettle'.format(variant_to_bool('+nettle')),
-            '--{0}-openssl'.format(variant_to_bool('+openssl')),
-            '--{0}-xml2'.format(variant_to_bool('+libxml2')),
-            '--{0}-expat'.format(variant_to_bool('+expat'))
-        ]
-
-        configure(*config_args)
+        configure('--prefix={0}'.format(prefix))
 
         make()
         # make('check')  # cannot build test suite with Intel compilers