Add a configtool_variable method to dependency

This mirrors the get_pkgconfig_variable but for config tool based
dependencies.

mesonbuild/dependencies/base.py

@@ -132,6 +132,9 @@ class Dependency:
     def get_pkgconfig_variable(self, variable_name):
         raise NotImplementedError('{!r} is not a pkgconfig dependency'.format(self.name))
 
+    def get_configtool_variable(self, variable_name):
+        raise NotImplementedError('{!r} is not a config-tool dependency'.format(self.name))
+
 
 class InternalDependency(Dependency):
     def __init__(self, version, incdirs, compile_args, link_args, libraries, sources, ext_deps):
@@ -288,6 +291,17 @@ class ConfigToolDependency(ExternalDependency):
     def get_methods(self):
         return [DependencyMethods.AUTO, DependencyMethods.CONFIG_TOOL]
 
+    def get_configtool_variable(self, variable_name):
+        p, out, _ = Popen_safe([self.config, '--{}'.format(variable_name)])
+        if p.returncode != 0:
+            if self.required:
+                raise DependencyException(
+                    'Could not get variable "{}" for dependency {}'.format(
+                        variable_name, self.name))
+        variable = out.strip()
+        mlog.debug('Got config-tool variable {} : {}'.format(variable_name, variable))
+        return variable
+
 
 class PkgConfigDependency(ExternalDependency):
     # The class's copy of the pkg-config path. Avoids having to search for it

mesonbuild/interpreter.py

@@ -274,6 +274,7 @@ class DependencyHolder(InterpreterObject, ObjectHolder):
                              'type_name': self.type_name_method,
                              'version': self.version_method,
                              'get_pkgconfig_variable': self.pkgconfig_method,
+                             'get_configtool_variable': self.configtool_method,
                              })
 
     def type_name_method(self, args, kwargs):
@@ -296,6 +297,15 @@ class DependencyHolder(InterpreterObject, ObjectHolder):
             raise InterpreterException('Variable name must be a string.')
         return self.held_object.get_pkgconfig_variable(varname)
 
+    def configtool_method(self, args, kwargs):
+        args = listify(args)
+        if len(args) != 1:
+            raise InterpreterException('get_configtool_variable takes exactly one argument.')
+        varname = args[0]
+        if not isinstance(varname, str):
+            raise InterpreterException('Variable name must be a string.')
+        return self.held_object.get_configtool_variable(varname)
+
 class InternalDependencyHolder(InterpreterObject, ObjectHolder):
     def __init__(self, dep):
         InterpreterObject.__init__(self)

test cases/common/165 config tool variable/meson.build

@@ -0,0 +1,31 @@
+# Copyright © 2017 Intel Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+project('config tool variable', 'cpp')
+
+
+dep_llvm = dependency('llvm', required : false)
+if not dep_llvm.found()
+  error('MESON_SKIP_TEST LLVM not installed.')
+endif
+
+includedir = dep_llvm.get_configtool_variable('includedir')
+includedir = join_paths(includedir, 'llvm')
+if host_machine.system() == 'windows'
+  cmd = run_command(['dir', includedir])
+else
+  cmd = run_command(['ls', includedir])
+endif
+
+assert(cmd.returncode() == 0, 'did not run successfully')