detect Fortran .mod files in GCCcore installations

easybuild/framework/easyblock.py

@@ -3303,6 +3303,19 @@ def regex_for_lib(lib):
 
         return fail_msg
 
+    def sanity_check_mod_files(self):
+        """
+        Check installation for Fortran .mod files
+        """
+        self.log.debug(f"Checking for .mod files in install directory {self.installdir}...")
+        mod_files = glob.glob(os.path.join(self.installdir, '**', '*.mod'), recursive=True)
+
+        fail_msg = None
+        if mod_files:
+            fail_msg = f"One or more .mod files found in {self.installdir}: " + ', '.join(mod_files)
+
+        return fail_msg
+
     def _sanity_check_step_common(self, custom_paths, custom_commands):
         """
         Determine sanity check paths and commands to use.
@@ -3625,6 +3638,16 @@ def xs2str(xs):
             self.log.warning("Check for required/banned linked shared libraries failed!")
             self.sanity_check_fail_msgs.append(linked_shared_lib_fails)
 
+        # software installed with GCCcore toolchain should not have Fortran module files (.mod),
+        # unless that's explicitly allowed
+        if self.toolchain.name in ('GCCcore',) and not self.cfg['skip_mod_files_sanity_check']:
+            mod_files_found_msg = self.sanity_check_mod_files()
+            if mod_files_found_msg:
+                if build_option('fail_on_mod_files_gcccore'):
+                    self.sanity_check_fail_msgs.append(mod_files_found_msg)
+                else:
+                    print_warning(mod_files_found_msg)
+
         # cleanup
         if self.fake_mod_data:
             self.clean_up_fake_module(self.fake_mod_data)

easybuild/framework/easyconfig/default.py

@@ -130,6 +130,7 @@
     'sanity_check_paths': [{}, ("List of files and directories to check "
                                 "(format: {'files':<list>, 'dirs':<list>})"), BUILD],
     'skip': [False, "Skip existing software", BUILD],
+    'skip_mod_files_sanity_check': [False, "Skip the check for .mod files in a GCCcore level install", BUILD],
     'skipsteps': [[], "Skip these steps", BUILD],
     'source_urls': [[], "List of URLs for source files", BUILD],
     'sources': [[], "List of source files", BUILD],

easybuild/tools/config.py

@@ -277,6 +277,7 @@ def mk_full_default_path(name, prefix=DEFAULT_PREFIX):
         'enforce_checksums',
         'experimental',
         'extended_dry_run',
+        'fail_on_mod_files_gcccore',
         'force',
         'generate_devel_module',
         'group_writable_installdir',

easybuild/tools/options.py

@@ -400,6 +400,8 @@ def override_options(self):
                              None, 'store_true', False),
             'extra-modules': ("List of extra modules to load after setting up the build environment",
                               'strlist', 'extend', None),
+            'fail-on-mod-files-gcccore': ("Fail if .mod files are detected in a GCCcore install", None, 'store_true',
+                                          False),
             'fetch': ("Allow downloading sources ignoring OS and modules tool dependencies, "
                       "implies --stop=fetch, --ignore-osdeps and ignore modules tool", None, 'store_true', False),
             'filter-deps': ("List of dependencies that you do *not* want to install with EasyBuild, "

test/framework/toy_build.py

@@ -3955,6 +3955,44 @@ def test_toy_build_sanity_check_linked_libs(self):
             self._test_toy_build(ec_file=test_ec, extra_args=args, force=False,
                                  raise_error=True, verbose=False, verify=False)
 
+    def test_toy_mod_files(self):
+        """Check detection of .mod files"""
+        test_ecs = os.path.join(os.path.dirname(__file__), 'easyconfigs', 'test_ecs')
+        toy_ec = os.path.join(test_ecs, 't', 'toy', 'toy-0.0.eb')
+        test_ec_txt = read_file(toy_ec)
+        test_ec = os.path.join(self.test_prefix, 'test.eb')
+        write_file(test_ec, test_ec_txt)
+
+        with self.mocked_stdout_stderr():
+            self._test_toy_build(ec_file=test_ec)
+
+        test_ec_txt += "\npostinstallcmds += ['touch %(installdir)s/lib/file.mod']"
+        write_file(test_ec, test_ec_txt)
+
+        with self.mocked_stdout_stderr():
+            self._test_toy_build(ec_file=test_ec)
+
+        args = ['--try-toolchain=GCCcore,6.2.0', '--disable-map-toolchains']
+        self.mock_stdout(True)
+        self.mock_stderr(True)
+        self._test_toy_build(ec_file=test_ec, extra_args=args)
+        stderr = self.get_stderr()
+        self.mock_stdout(False)
+        self.mock_stderr(False)
+        pattern = r"WARNING: One or more \.mod files found in .*/software/toy/0.0-GCCcore-6.2.0: .*/lib64/file.mod"
+        self.assertRegex(stderr.strip(), pattern)
+
+        args += ['--fail-on-mod-files-gcccore']
+        pattern = r"Sanity check failed: One or more \.mod files found in .*/toy/0.0-GCCcore-6.2.0: .*/lib/file.mod"
+        self.assertErrorRegex(EasyBuildError, pattern, self.run_test_toy_build_with_output, ec_file=test_ec,
+                              extra_args=args, verify=False, fails=True, verbose=False, raise_error=True)
+
+        test_ec_txt += "\nskip_mod_files_sanity_check = True"
+        write_file(test_ec, test_ec_txt)
+
+        with self.mocked_stdout_stderr():
+            self._test_toy_build(ec_file=test_ec, extra_args=args)
+
     def test_toy_ignore_test_failure(self):
         """Check whether use of --ignore-test-failure is mentioned in build output."""
         args = ['--ignore-test-failure']