Allow test to depend on executable target in cross build. (#2007)

* Add a crossbuild case in 'test case/common/1 trivial/meson.build'

* Add native flags for crossbuild tests.

mesonbuild/backend/backends.py

@@ -506,6 +506,8 @@ class Backend:
             is_cross = self.environment.is_cross_build() and \
                 self.environment.cross_info.need_cross_compiler() and \
                 self.environment.cross_info.need_exe_wrapper()
+            if isinstance(exe, build.BuildTarget):
+                is_cross = is_cross and exe.is_cross
             if is_cross:
                 exe_wrapper = self.environment.cross_info.config['binaries'].get('exe_wrapper', None)
             else:

test cases/common/1 trivial/meson.build

@@ -11,6 +11,11 @@ if meson.get_compiler('c').get_id() == 'intel'
   add_project_arguments('-diag-error', '10159', language : 'c')
 endif
 
+if meson.is_cross_build()
+  native_exe = executable('native-trivialprog', sources : sources, native : true)
+  test('native exe in cross build', native_exe)
+endif
+
 exe = executable('trivialprog', sources : sources)
 
 test('runtest', exe) # This is a comment