Refactor PIC configuration

Documentation related changes have been sent upstream instead of
describing things in the module. The PHP/PositionIndependentCode module
is also redundant and not necessary. For now PIC configuration is
simplified here until more fine tuning will be needed if ever.

Additionally, the LINK_LIBRARIES target property for ext/standard
internal functions targets are redundant as CMake 4.1 evaluates this
property transitively now. And for object libraries they are also
not needed anyway.

Author: petk

cmake/CMakeLists.txt

@@ -80,8 +80,8 @@ define_property(
 # Check whether IPO/LTO can be enabled.
 include(PHP/Optimization)
 
-# Set CMAKE_POSITION_INDEPENDENT_CODE.
-include(PHP/PositionIndependentCode)
+include(CheckPIESupported)
+check_pie_supported()
 
 # Configure build types.
 include(cmake/BuildTypes.cmake)

cmake/cmake/CMakeDefaults.cmake

@@ -47,3 +47,8 @@ mark_as_advanced(CMAKE_COMPILE_WARNING_AS_ERROR)
 # Set default visibility of all symbols to hidden if the compiler (for example,
 # GCC >= 4) supports it. This can help reduce the binary size and startup time.
 set(CMAKE_C_VISIBILITY_PRESET "hidden")
+
+# Enable position-independent code (PIC) for all targets.
+if(NOT DEFINED CMAKE_POSITION_INDEPENDENT_CODE)
+  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+endif()

cmake/cmake/modules/PHP/PositionIndependentCode.cmake

@@ -478,7 +478,6 @@ set_target_properties(
   PROPERTIES
     INCLUDE_DIRECTORIES $<TARGET_PROPERTY:php_ext_standard,INCLUDE_DIRECTORIES>
     COMPILE_DEFINITIONS $<TARGET_PROPERTY:php_ext_standard,COMPILE_DEFINITIONS>
-    LINK_LIBRARIES $<TARGET_PROPERTY:php_ext_standard,LINK_LIBRARIES>
 )
 
 target_compile_definitions(