Can get arbitrary data from cross file properties.

manual tests/9 nostdlib/meson.build

@@ -1,5 +1,9 @@
 project('own libc', 'c')
 
+# Not related to this test, but could not find a better place for this test.
+assert(meson.get_cross_property('nonexisting', 'defaultvalue') == 'defaultvalue',
+  'Cross prop getting is broken.')
+
 # A simple project that uses its own libc.
 
 # Note that we don't need to specify anything, the flags to use

mesonbuild/environment.py

@@ -771,6 +771,9 @@ class CrossBuildInfo():
     def get_stdlib(self, language):
         return self.config['properties'][language + '_stdlib']
 
+    def get_properties(self):
+        return self.config['properties']
+
     # Wehn compiling a cross compiler we use the native compiler for everything.
     # But not when cross compiling a cross compiler.
     def need_cross_compiler(self):

mesonbuild/interpreter.py

@@ -866,6 +866,7 @@ class MesonMain(InterpreterObject):
                              'install_dependency_manifest': self.install_dependency_manifest_method,
                              'project_version': self.project_version_method,
                              'project_name' : self.project_name_method,
+                             'get_cross_property': self.get_cross_property_method,
                             })
 
     def add_install_script_method(self, args, kwargs):
@@ -965,6 +966,20 @@ class MesonMain(InterpreterObject):
     def project_name_method(self, args, kwargs):
         return self.interpreter.active_projectname
 
+    def get_cross_property_method(self, args, kwargs):
+        if len(args) < 1 or len(args) > 2:
+            raise InterpreterException('Must have one or two arguments.')
+        propname = args[0]
+        if not isinstance(propname, str):
+            raise InterpreterException('Property name must be string.')
+        try:
+            props = self.interpreter.environment.cross_info.get_properties()
+            return props[propname]
+        except Exception:
+            if len(args) == 2:
+                return args[1]
+            raise InterpreterException('Unknown cross property: %s.' % propname)
+
 class Interpreter():
 
     def __init__(self, build, backend, subproject='', subdir='', subproject_dir='subprojects'):

test cases/failing/29 no crossprop/meson.build

@@ -0,0 +1,3 @@
+project('no crossprop', 'c')
+
+message(meson.get_cross_property('nonexisting'))