Use File objects for all sources. Fix all basic tests.

backends.py

@@ -167,6 +167,8 @@ class Backend():
         for osrc in extobj.srclist:
             if not self.source_suffix_in_objs:
                 osrc = '.'.join(osrc.split('.')[:-1])
+            if hasattr(osrc, 'fname'): # FIXME allow only strings.
+                osrc = osrc.fname
             objname = os.path.join(proj_dir_to_build_root,
                                    targetdir, os.path.basename(osrc) + suffix)
             result.append(objname)

build.py

@@ -259,6 +259,7 @@ class BuildTarget():
             for src in srclist:
                 if not isinstance(src, str):
                     raise coredata.MesonException('Extraction arguments must be strings.')
+                src = File(False, self.subdir, src)
                 if src not in self.sources:
                     raise coredata.MesonException('Tried to extract unknown source %s.' % src)
                 obj_src.append(src)

interpreter.py

@@ -1494,6 +1494,19 @@ class Interpreter():
                 result.append(a)
         return result
 
+    def source_strings_to_files(self, sources):
+        results = []
+        for s in sources:
+            if isinstance(s, File) or isinstance(s, GeneratedListHolder) or \
+            isinstance(s, CustomTargetHolder):
+                pass
+            elif isinstance(s, str): # FIXME do not allow plain strings.
+                s = File.from_source_file(self.environment.source_dir, self.subdir, s)
+            else:
+                raise RuntimeError("Unreachable code")
+            results.append(s)
+        return results
+
     def build_target(self, node, args, kwargs, targetholder):
         args = self.flatten(args)
         name = args[0]
@@ -1515,6 +1528,7 @@ class Interpreter():
         except KeyError:
             kw_src = []
         sources += kw_src
+        sources = self.source_strings_to_files(sources)
         objs = self.flatten(kwargs.get('objects', []))
         if not isinstance(objs, list):
             objs = [objs]

mesonlib.py

@@ -48,6 +48,12 @@ class File:
     def split(self, s):
         return self.fname.split(s)
 
+    def __eq__(self, other):
+        return (self.fname, self.subdir, self.is_built) == (other.fname, other.subdir, other.is_built)
+
+    def __hash__(self):
+        return hash((self.fname, self.subdir, self.is_built))
+
 def is_osx():
     return platform.system().lower() == 'darwin'