During reconfigure, show that no compiler was found, if compiler fails sanity check.

mesonbuild/ast/introspection.py

@@ -181,7 +181,7 @@ class IntrospectionInterpreter(AstInterpreter):
             lang = lang.lower()
             if lang not in self.coredata.compilers[for_machine]:
                 try:
-                    comp = detect_compiler_for(self.environment, lang, for_machine)
+                    comp = detect_compiler_for(self.environment, lang, for_machine, True)
                 except mesonlib.MesonException:
                     # do we even care about introspecting this language?
                     if required:

mesonbuild/compilers/detect.py

@@ -111,11 +111,15 @@ def compiler_from_language(env: 'Environment', lang: str, for_machine: MachineCh
     }
     return lang_map[lang](env, for_machine) if lang in lang_map else None
 
-def detect_compiler_for(env: 'Environment', lang: str, for_machine: MachineChoice) -> T.Optional[Compiler]:
+def detect_compiler_for(env: 'Environment', lang: str, for_machine: MachineChoice, skip_sanity_check: bool) -> T.Optional[Compiler]:
     comp = compiler_from_language(env, lang, for_machine)
-    if comp is not None:
+    if comp is None:
+        return comp
     assert comp.for_machine == for_machine
     env.coredata.process_new_compiler(lang, comp, env)
+    if not skip_sanity_check:
+        comp.sanity_check(env.get_scratch_dir(), env)
+    env.coredata.compilers[comp.for_machine][lang] = comp
     return comp
 
 

mesonbuild/coredata.py

@@ -918,7 +918,6 @@ class CoreData:
     def process_new_compiler(self, lang: str, comp: 'Compiler', env: 'Environment') -> None:
         from . import compilers
 
-        self.compilers[comp.for_machine][lang] = comp
         self.add_compiler_options(comp.get_options(), lang, comp.for_machine, env)
 
         enabled_opts: T.List[OptionKey] = []

mesonbuild/interpreter/interpreter.py

@@ -1491,13 +1491,12 @@ class Interpreter(InterpreterBase, HoldableObject):
             comp = self.coredata.compilers[for_machine].get(lang)
             if not comp:
                 try:
-                    comp = compilers.detect_compiler_for(self.environment, lang, for_machine)
+                    skip_sanity_check = self.should_skip_sanity_check(for_machine)
+                    if skip_sanity_check:
+                        mlog.log_once('Cross compiler sanity tests disabled via the cross file.')
+                    comp = compilers.detect_compiler_for(self.environment, lang, for_machine, skip_sanity_check)
                     if comp is None:
                         raise InvalidArguments(f'Tried to use unknown language "{lang}".')
-                    if self.should_skip_sanity_check(for_machine):
-                        mlog.log_once('Cross compiler sanity tests disabled via the cross file.')
-                    else:
-                        comp.sanity_check(self.environment.get_scratch_dir(), self.environment)
                 except mesonlib.MesonException:
                     if not required:
                         mlog.log('Compiler for language',

mesonbuild/modules/java.py

@@ -42,7 +42,7 @@ class JavaModule(NewExtensionModule):
 
     def __get_java_compiler(self, state: ModuleState) -> Compiler:
         if 'java' not in state.environment.coredata.compilers[MachineChoice.BUILD]:
-            detect_compiler_for(state.environment, 'java', MachineChoice.BUILD)
+            detect_compiler_for(state.environment, 'java', MachineChoice.BUILD, False)
         return state.environment.coredata.compilers[MachineChoice.BUILD]['java']
 
     @FeatureNew('java.generate_native_headers', '0.62.0')

unittests/allplatformstests.py

@@ -841,7 +841,7 @@ class AllPlatformTests(BasePlatformTests):
         testdir = os.path.join("test cases/cython", '2 generated sources')
         env = get_fake_env(testdir, self.builddir, self.prefix)
         try:
-            detect_compiler_for(env, "cython", MachineChoice.HOST)
+            detect_compiler_for(env, "cython", MachineChoice.HOST, True)
         except EnvironmentException:
             raise SkipTest("Cython is not installed")
         self.init(testdir)
@@ -866,7 +866,7 @@ class AllPlatformTests(BasePlatformTests):
         testdir = os.path.join("test cases/cython", '2 generated sources')
         env = get_fake_env(testdir, self.builddir, self.prefix)
         try:
-            cython = detect_compiler_for(env, "cython", MachineChoice.HOST)
+            cython = detect_compiler_for(env, "cython", MachineChoice.HOST, True)
             if not version_compare(cython.version, '>=0.29.33'):
                 raise SkipTest('Cython is too old')
         except EnvironmentException:
@@ -2141,7 +2141,7 @@ class AllPlatformTests(BasePlatformTests):
         env = get_fake_env()
         for l in ['cpp', 'cs', 'd', 'java', 'cuda', 'fortran', 'objc', 'objcpp', 'rust']:
             try:
-                comp = detect_compiler_for(env, l, MachineChoice.HOST)
+                comp = detect_compiler_for(env, l, MachineChoice.HOST, True)
                 with tempfile.TemporaryDirectory() as d:
                     comp.sanity_check(d, env)
                 langs.append(l)
@@ -2158,7 +2158,7 @@ class AllPlatformTests(BasePlatformTests):
                 if is_windows() and lang == 'fortran' and target_type == 'library':
                     # non-Gfortran Windows Fortran compilers do not do shared libraries in a Fortran standard way
                     # see "test cases/fortran/6 dynamic"
-                    fc = detect_compiler_for(env, 'fortran', MachineChoice.HOST)
+                    fc = detect_compiler_for(env, 'fortran', MachineChoice.HOST, True)
                     if fc.get_id() in {'intel-cl', 'pgi'}:
                         continue
                 # test empty directory
@@ -4177,18 +4177,18 @@ class AllPlatformTests(BasePlatformTests):
             env = get_fake_env()
 
             # Get the compiler so we know which compiler class to mock.
-            cc =  detect_compiler_for(env, 'c', MachineChoice.HOST)
+            cc =  detect_compiler_for(env, 'c', MachineChoice.HOST, True)
             cc_type = type(cc)
 
             # Test a compiler that acts as a linker
             with mock.patch.object(cc_type, 'INVOKES_LINKER', True):
-                cc =  detect_compiler_for(env, 'c', MachineChoice.HOST)
+                cc =  detect_compiler_for(env, 'c', MachineChoice.HOST, True)
                 link_args = env.coredata.get_external_link_args(cc.for_machine, cc.language)
                 self.assertEqual(sorted(link_args), sorted(['-DCFLAG', '-flto']))
 
             # And one that doesn't
             with mock.patch.object(cc_type, 'INVOKES_LINKER', False):
-                cc =  detect_compiler_for(env, 'c', MachineChoice.HOST)
+                cc =  detect_compiler_for(env, 'c', MachineChoice.HOST, True)
                 link_args = env.coredata.get_external_link_args(cc.for_machine, cc.language)
                 self.assertEqual(sorted(link_args), sorted(['-flto']))