Add `export_dynamic` argument to `executable`. (#2662)

4 files changed, 30 insertions, 8 deletions

diff --git a/mesonbuild/backend/ninjabackend.py b/mesonbuild/backend/ninjabackend.py
index 2429fba..2945d6a 100644
--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -2341,6 +2341,9 @@ rule FORTRAN_DEP_HACK
             # If gui_app, and that's significant on this platform
             if target.gui_app and hasattr(linker, 'get_gui_app_args'):
                 commands += linker.get_gui_app_args()
+            # If export_dynamic, add the appropriate linker arguments
+            if target.export_dynamic:
+                commands += linker.gen_export_dynamic_link_args(self.environment)
             # If implib, and that's significant on this platform (i.e. Windows using either GCC or Visual Studio)
             if target.import_filename:
                 commands += linker.gen_import_library_args(os.path.join(self.get_target_dir(target), target.import_filename))
diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 8a2e716..16a18a9 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -82,6 +82,7 @@ known_lib_kwargs.update({'version': True, # Only for shared libs
 
 known_exe_kwargs = known_basic_kwargs.copy()
 known_exe_kwargs.update({'implib': True,
+                         'export_dynamic': True
                          })
 
 class InvalidArguments(MesonException):
@@ -1160,23 +1161,33 @@ class Executable(BuildTarget):
         # The import library that GCC would generate (and prefer)
         self.gcc_import_filename = None
 
-        # if implib appears, this target is linkwith:-able, but that only means
-        # something on Windows platforms.
-        self.is_linkwithable = False
-        if 'implib' in kwargs and kwargs['implib']:
+        # Check for export_dynamic
+        self.export_dynamic = False
+        if kwargs.get('export_dynamic'):
+            if not isinstance(kwargs['export_dynamic'], bool):
+                raise InvalidArguments('"export_dynamic" keyword argument must be a boolean')
+            self.export_dynamic = True
+        if kwargs.get('implib'):
+            self.export_dynamic = True
+        if self.export_dynamic and kwargs.get('implib') is False:
+            raise InvalidArguments('"implib" keyword argument must not be false for if "export_dynamic" is true')
+
+        # If using export_dynamic, set the import library name
+        if self.export_dynamic:
             implib_basename = self.name + '.exe'
-            if not isinstance(kwargs['implib'], bool):
+            if not isinstance(kwargs.get('implib', False), bool):
                 implib_basename = kwargs['implib']
-            self.is_linkwithable = True
             if for_windows(is_cross, environment) or for_cygwin(is_cross, environment):
                 self.vs_import_filename = '{0}.lib'.format(implib_basename)
                 self.gcc_import_filename = 'lib{0}.a'.format(implib_basename)
-
                 if self.get_using_msvc():
                     self.import_filename = self.vs_import_filename
                 else:
                     self.import_filename = self.gcc_import_filename
 
+        # Only linkwithable if using export_dynamic
+        self.is_linkwithable = self.export_dynamic
+
     def type_suffix(self):
         return "@exe"
 
diff --git a/mesonbuild/compilers/c.py b/mesonbuild/compilers/c.py
index 233fc84..4c6e3a2 100644
--- a/mesonbuild/compilers/c.py
+++ b/mesonbuild/compilers/c.py
@@ -183,6 +183,14 @@ class CCompiler(Compiler):
     def get_default_include_dirs(self):
         return []
 
+    def gen_export_dynamic_link_args(self, env):
+        if for_windows(env.is_cross_build(), env):
+            return ['-Wl,--export-all-symbols']
+        elif for_darwin(env.is_cross_build(), env):
+            return []
+        else:
+            return ['-Wl,-export-dynamic']
+
     def gen_import_library_args(self, implibname):
         """
         The name of the outputted import library
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index 48b8d82..488c2a3 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -1347,7 +1347,7 @@ build_target_common_kwargs = (
     rust_kwargs |
     cs_kwargs)
 
-exe_kwargs = (build_target_common_kwargs) | {'implib'}
+exe_kwargs = (build_target_common_kwargs) | {'implib', 'export_dynamic'}
 shlib_kwargs = (build_target_common_kwargs) | {'version', 'soversion'}
 shmod_kwargs = shlib_kwargs
 stlib_kwargs = shlib_kwargs