build: add function get_build_targets to Build class

Add function to Build class to get targets of type BuildTarget
Update xcode backend to call get_build_targets when iterating over targets.
This resolves crash in xcode backend when using custom targets:

AttributeError: ‘CustomTarget’ object has no attribute ‘objects’

1 files changed, 7 insertions, 0 deletions

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 32daf54..36bce1c 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -223,6 +223,13 @@ class Build:
         self.searched_programs = set() # The list of all programs that have been searched for.
         self.dependency_overrides = PerMachine({}, {})
 
+    def get_build_targets(self):
+        build_targets = OrderedDict()
+        for name, t in self.targets.items():
+            if isinstance(t, BuildTarget):
+                build_targets[name] = t
+        return build_targets
+
     def copy(self):
         other = Build(self.environment)
         for k, v in self.__dict__.items():