5 files changed, 31 insertions, 1 deletions
diff --git a/mesonbuild/backend/backends.py b/mesonbuild/backend/backends.py
index 947be1c..e548096 100644
--- a/mesonbuild/backend/backends.py
+++ b/mesonbuild/backend/backends.py
@@ -281,7 +281,8 @@ class Backend:
                                os.path.join('dummyprefixdir', fromdir))
 
     def flatten_object_list(self, target, proj_dir_to_build_root=''):
-        return self._flatten_object_list(target, target.get_objects(), proj_dir_to_build_root)
+        obj_list = self._flatten_object_list(target, target.get_objects(), proj_dir_to_build_root)
+        return list(dict.fromkeys(obj_list))
 
     def _flatten_object_list(self, target, objects, proj_dir_to_build_root):
         obj_list = []
diff --git a/test cases/unit/69 static link/lib/func17.c b/test cases/unit/69 static link/lib/func17.c
new file mode 100644
index 0000000..d1d8ec4
--- /dev/null
+++ b/test cases/unit/69 static link/lib/func17.c
@@ -0,0 +1,4 @@
+int func17()
+{
+  return 1;
+}
diff --git a/test cases/unit/69 static link/lib/func18.c b/test cases/unit/69 static link/lib/func18.c
new file mode 100644
index 0000000..c149085
--- /dev/null
+++ b/test cases/unit/69 static link/lib/func18.c
@@ -0,0 +1,6 @@
+int func17();
+
+int func18()
+{
+  return func17() + 1;
+}
diff --git a/test cases/unit/69 static link/lib/func19.c b/test cases/unit/69 static link/lib/func19.c
new file mode 100644
index 0000000..69120e4
--- /dev/null
+++ b/test cases/unit/69 static link/lib/func19.c
@@ -0,0 +1,7 @@
+int func17();
+int func18();
+
+int func19()
+{
+  return func17() + func18();
+}
diff --git a/test cases/unit/69 static link/lib/meson.build b/test cases/unit/69 static link/lib/meson.build
index 5f04aab..8f95fc4 100644
--- a/test cases/unit/69 static link/lib/meson.build
+++ b/test cases/unit/69 static link/lib/meson.build
@@ -66,3 +66,15 @@ libfunc15 = static_library('func15', 'func15.c',
 libfunc16 = static_library('func16', 'func16.c',
   link_with : libfunc15,
   install : true)
+
+# Verify func17.c.o gets included only once into libfunc19, otherwise
+# func19-shared would failed with duplicated symbol.
+libfunc17 = static_library('func17', 'func17.c',
+  install : false)
+libfunc18 = static_library('func18', 'func18.c',
+  link_with : libfunc17,
+  install : false)
+libfunc19 = static_library('func19', 'func19.c',
+  link_whole : [libfunc17, libfunc18],
+  install : false)
+shared_library('func19-shared', link_whole : [libfunc19])