unittests: add test case for setting and retrieving build options

Check that build options fall back to host options, and that they
can be retrieved with get_option.

Signed-off-by: Paolo Bonzini <[email protected]>
(cherry picked from commit 1537a13)

Author: bonzini

test cases/unit/69 cross/crossfile.in

@@ -3,3 +3,6 @@ system = '@system@'
 cpu_family = '@cpu_family@'
 cpu = '@cpu@'
 endian = '@endian@'
+
+[built-in options]
+c_args = ['-funroll-loops']

test cases/unit/69 cross/meson.build

@@ -1,16 +1,25 @@
 project('crosstest')
 
+add_languages('c', native: true)
 if get_option('generate')
     conf_data = configuration_data()
     conf_data.set('system', build_machine.system())
     conf_data.set('cpu', build_machine.cpu())
     conf_data.set('cpu_family', build_machine.cpu_family())
     conf_data.set('endian', build_machine.endian())
+    conf_data.set('c_args', '-pedantic')
 
     configure_file(input: 'crossfile.in',
                 output: 'crossfile',
                 configuration: conf_data)
-    message('Written cross file')
+    configure_file(input: 'nativefile.in',
+                output: 'nativefile',
+                configuration: conf_data)
+    message('Written native and cross file')
+
+    add_languages('c', native: false)
+    assert(get_option('build.c_args') == get_option('c_args'))
 else
     assert(meson.is_cross_build(), 'not setup as cross build')
+    assert(get_option('build.c_args') == ['-pedantic'])
 endif

test cases/unit/69 cross/nativefile.in

@@ -0,0 +1,2 @@
+[built-in options]
+c_args = ['@c_args@']

unittests/allplatformstests.py

@@ -3276,10 +3276,15 @@ def test_clang_tidy_fix(self):
     def test_identity_cross(self):
         testdir = os.path.join(self.unit_test_dir, '69 cross')
         # Do a build to generate a cross file where the host is this target
-        self.init(testdir, extra_args=['-Dgenerate=true'])
+        # build.c_args is ignored here.
+        self.init(testdir, extra_args=['-Dgenerate=true', '-Dc_args=-funroll-loops',
+                                       '-Dbuild.c_args=-pedantic'])
+        self.meson_native_files = [os.path.join(self.builddir, "nativefile")]
+        self.assertTrue(os.path.exists(self.meson_native_files[0]))
         self.meson_cross_files = [os.path.join(self.builddir, "crossfile")]
         self.assertTrue(os.path.exists(self.meson_cross_files[0]))
-        # Now verify that this is detected as cross
+        # Now verify that this is detected as cross and build options are
+        # processed correctly
         self.new_builddir()
         self.init(testdir)