Update llvm, adjust dependency specs and conflicts (#14561)

This PR adds a new version of llvm and fixes the dependency specs.

- This package depends on libtinfo in all cases so change the ncurses
  dependency to reflect that
- if +lldb is in the spec but +python is not then do not build the lldb
  python support
- build lldb python support only if +python is in the spec with +lldb
- install the llvm python bindings if +python is in the spec
- install the clang python bindings if +clang and +python are in the spec
- Fixes for conflicts with ~clang
- Fix typo in conflict of compiler-rt and flang

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

@@ -22,6 +22,7 @@ class Llvm(CMakePackage):
     family = 'compiler'  # Used by lmod
 
     version('master', branch='master')
+    version('9.0.1', sha256='be7b034641a5fda51ffca7f5d840b1a768737779f75f7c4fd18fe2d37820289a')
     version('9.0.0', sha256='7807fac25330e24e9955ca46cd855dd34bbc9cc4fdba8322366206654d1036f2')
     version('8.0.0', sha256='d81238b4a69e93e29f74ce56f8107cbfcf0c7d7b40510b7879e98cc031e25167')
     version('7.1.0', sha256='71c93979f20e01f1a1cc839a247945f556fa5e63abf2084e8468b238080fd839')
@@ -102,8 +103,10 @@ class Llvm(CMakePackage):
     # openmp dependencies
     depends_on('perl-data-dumper', type=('build'))
 
+    # ncurses dependency
+    depends_on('ncurses+termlib')
+
     # lldb dependencies
-    depends_on('ncurses', when='+lldb')
     depends_on('swig', when='+lldb')
     depends_on('libedit', when='+lldb')
     depends_on('py-six', when='@5.0.0: +lldb +python')
@@ -115,8 +118,11 @@ class Llvm(CMakePackage):
     depends_on('gmp', when='@:3.6.999 +polly')
     depends_on('isl', when='@:3.6.999 +polly')
 
-    conflicts('+clang_extra', when='~clang')
-    conflicts('+lldb',        when='~clang')
+    conflicts('+clang_extra',     when='~clang')
+    conflicts('+lldb',            when='~clang')
+    conflicts('+libcxx',          when='~clang')
+    conflicts('+internal_unwind', when='~clang')
+    conflicts('+compiler-rt',     when='~clang')
 
     # LLVM 4 and 5 does not build with GCC 8
     conflicts('%gcc@8:',       when='@:5')
@@ -194,6 +200,9 @@ def cmake_args(self):
         if '+python' in spec and '+lldb' in spec and spec.satisfies('@5.0.0:'):
             cmake_args.append('-DLLDB_USE_SYSTEM_SIX:Bool=TRUE')
 
+        if '~python' in spec and '+lldb' in spec:
+            cmake_args.append('-DLLDB_DISABLE_PYTHON:Bool=TRUE')
+
         if '+gold' in spec:
             cmake_args.append('-DLLVM_BINUTILS_INCDIR=' +
                               spec['binutils'].prefix.include)
@@ -282,10 +291,11 @@ def pre_install(self):
 
     @run_after('install')
     def post_install(self):
-        if '+clang' in self.spec and '+python' in self.spec:
-            install_tree(
-                'tools/clang/bindings/python/clang',
-                join_path(site_packages_dir, 'clang'))
+        if '+python' in self.spec:
+            install_tree('llvm/bindings/python', site_packages_dir)
+
+            if '+clang' in self.spec:
+                install_tree('clang/bindings/python', site_packages_dir)
 
         with working_dir(self.build_directory):
             install_tree('bin', join_path(self.prefix, 'libexec', 'llvm'))