cmake/interpreter: propagate object library pie flag

mesonbuild/cmake/interpreter.py

@@ -534,6 +534,9 @@ def process_object_libs(self, obj_target_list: T.List['ConverterTarget'], linker
         # Filter out object files from the sources
         self.generated = [x for x in self.generated if not any(x.name.endswith('.' + y) for y in obj_suffixes)]
 
+        if not self.sources and not self.generated and self.object_libs:
+            self.pie |= all(x.pie for x in self.object_libs)
+
     def _append_objlib_sources(self, tgt: 'ConverterTarget') -> None:
         self.includes += tgt.includes
         self.sources += tgt.sources

test cases/cmake/29 object library pic/meson.build

@@ -0,0 +1,7 @@
+project('29 object library pic', 'c')
+
+cm = import('cmake')
+sub_pro = cm.subproject('cmTest')
+sub_dep = sub_pro.dependency('cmTestLib')
+
+shared_library('slib', 'slib.c', dependencies: sub_dep)

test cases/cmake/29 object library pic/slib.c

@@ -0,0 +1,3 @@
+extern void f(void);
+
+void g(void) { f(); }

test cases/cmake/29 object library pic/subprojects/cmTest/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION ${CMAKE_VERSION})
+
+project(cmTest C)
+
+add_library(cmTestLib_objs OBJECT "x.c")
+set_target_properties(cmTestLib_objs PROPERTIES POSITION_INDEPENDENT_CODE TRUE)
+
+add_library(cmTestLib STATIC $<TARGET_OBJECTS:cmTestLib_objs>)
+set_target_properties(cmTestLib PROPERTIES POSITION_INDEPENDENT_CODE TRUE)

test cases/cmake/29 object library pic/subprojects/cmTest/x.c

@@ -0,0 +1 @@
+void f(void) { }