Can get source dir location and use it to build stuff.

interpreter.py

@@ -534,15 +534,24 @@ class CompilerHolder(InterpreterObject):
         return haz
 
 class MesonMain(InterpreterObject):
-    def __init__(self, build):
+    def __init__(self, build, interpreter):
         InterpreterObject.__init__(self)
         self.build = build
+        self.interpreter = interpreter
         self.methods.update({'get_compiler': self.get_compiler_method,
                              'is_cross_build' : self.is_cross_build_method,
                              'has_exe_wrapper' : self.has_exe_wrapper_method,
                              'is_unity' : self.is_unity_method,
+                             'current_source_dir' : self.current_source_dir_method,
                              })
 
+    def current_source_dir_method(self, args, kwargs):
+        src = self.interpreter.environment.source_dir
+        sub = self.interpreter.subdir
+        if sub == '':
+            return src
+        return os.path.join(src, sub)
+
     def has_exe_wrapper_method(self, args, kwargs):
         if self.is_cross_build_method(None, None):
             return 'exe_wrap' in  self.build.environment.cross_info
@@ -600,7 +609,7 @@ class Interpreter():
         self.builtin = {}
         self.builtin['build'] = Build()
         self.builtin['host'] = Host(build.environment)
-        self.builtin['meson'] = MesonMain(build)
+        self.builtin['meson'] = MesonMain(build, self)
         self.environment = build.environment
         self.build_func_dict()
         self.build_def_files = [environment.build_filename]

test cases/linuxlike/3 linker script/meson.build

@@ -1,6 +1,6 @@
 project('linker script', 'c')
 
-vflag = '-Wl,--version-script,@0@/bob.map'.format('/home/jpakkane/workspace/meson/test cases/linuxlike/3 linker script')
+vflag = '-Wl,--version-script,@0@/bob.map'.format(meson.current_source_dir())
 
 l = shared_library('bob', 'bob.c', link_flags : vflag)
 e = executable('prog', 'prog.c', link_with : l)