fix2865

mesonbuild/build.py

@@ -380,6 +380,7 @@ def __init__(self, name, subdir, subproject, is_cross, sources, objects, environ
         self.process_compilers_late()
         self.validate_sources()
         self.validate_cross_install(environment)
+        self.check_module_linking()
 
     def __lt__(self, other):
         return self.get_id() < other.get_id()
@@ -1027,6 +1028,13 @@ def get_using_msvc(self):
     def is_linkable_target(self):
         return False
 
+    def check_module_linking(self):
+        '''
+        Warn if shared modules are linked with target: (link_with) #2865
+        '''
+        for link_target in self.link_targets:
+            if isinstance(link_target, SharedModule):
+                mlog.warning('''Linking shared modules to targets is not recommended''')
 
 class Generator:
     def __init__(self, args, kwargs):

run_unittests.py

@@ -1897,6 +1897,17 @@ def test_flock(self):
                     exception_raised = True
         self.assertTrue(exception_raised, 'Double locking did not raise exception.')
 
+    def test_check_module_linking(self):
+        '''
+        Test that shared modules are not linked with targets(link_with:) #2865
+        '''
+        tdir = os.path.join(self.unit_test_dir, '25 shared_mod linking')
+        out = self.init(tdir)
+        for expected in [
+            r'WARNING: Linking shared modules to targets is not recommended'
+        ]:
+            self.assertRegex(out, re.escape(expected))
+
     def test_ndebug_if_release_disabled(self):
         testdir = os.path.join(self.unit_test_dir, '25 ndebug if-release')
         self.init(testdir, extra_args=['--buildtype=release', '-Db_ndebug=if-release'])

test cases/unit/25 shared_mod linking/installed_files.txt

@@ -0,0 +1 @@
+usr/bin/prog?exe

test cases/unit/25 shared_mod linking/libfile.c

@@ -0,0 +1,14 @@
+#if defined _WIN32 || defined __CYGWIN__
+  #define DLL_PUBLIC __declspec(dllexport)
+#else
+  #if defined __GNUC__
+    #define DLL_PUBLIC __attribute__ ((visibility("default")))
+  #else
+    #pragma message ("Compiler does not support symbol visibility.")
+    #define DLL_PUBLIC
+  #endif
+#endif
+
+int DLL_PUBLIC func() {
+    return 0;
+}

test cases/unit/25 shared_mod linking/main.c

@@ -0,0 +1,11 @@
+#if defined _WIN32 || defined __CYGWIN__
+  #define DLL_IMPORT __declspec(dllimport)
+#else
+  #define DLL_IMPORT
+#endif
+
+int DLL_IMPORT func();
+
+int main(int argc, char **arg) {
+    return func();
+}

test cases/unit/25 shared_mod linking/meson.build

@@ -0,0 +1,6 @@
+project('shared library linking test', 'c', 'cpp')
+
+lib = shared_module('mylib',
+ 'libfile.c' # Split to different lines before and after the comma to test parser.
+ , install : false) # Don't install libraries in common tests; the path is platform-specific
+exe = executable('prog', 'main.c', link_with : lib, install : true)