mirror of
https://github.com/reactos/CMake.git
synced 2024-11-27 05:20:34 +00:00
135 lines
4.4 KiB
CMake
135 lines
4.4 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
|
|
# file Copyright.txt or https://cmake.org/licensing for details.
|
|
|
|
#[=======================================================================[.rst:
|
|
CheckPIESupported
|
|
-----------------
|
|
|
|
Check whether the linker supports Position Independent Code (PIE) or No
|
|
Position Independent Code (NO_PIE) for executables.
|
|
Use this to ensure that the :prop_tgt:`POSITION_INDEPENDENT_CODE` target
|
|
property for executables will be honored at link time.
|
|
|
|
.. command:: check_pie_supported
|
|
|
|
::
|
|
|
|
check_pie_supported([OUTPUT_VARIABLE <output>]
|
|
[LANGUAGES <lang>...])
|
|
|
|
Options are:
|
|
|
|
``OUTPUT_VARIABLE <output>``
|
|
Set ``<output>`` variable with details about any error.
|
|
``LANGUAGES <lang>...``
|
|
Check the linkers used for each of the specified languages.
|
|
Supported languages are ``C``, ``CXX``, and ``Fortran``.
|
|
|
|
It makes no sense to use this module when :policy:`CMP0083` is set to ``OLD``,
|
|
so the command will return an error in this case. See policy :policy:`CMP0083`
|
|
for details.
|
|
|
|
Variables
|
|
^^^^^^^^^
|
|
|
|
For each language checked, two boolean cache variables are defined.
|
|
|
|
``CMAKE_<lang>_LINK_PIE_SUPPORTED``
|
|
Set to ``YES`` if ``PIE`` is supported by the linker and ``NO`` otherwise.
|
|
``CMAKE_<lang>_LINK_NO_PIE_SUPPORTED``
|
|
Set to ``YES`` if ``NO_PIE`` is supported by the linker and ``NO`` otherwise.
|
|
|
|
Examples
|
|
^^^^^^^^
|
|
|
|
.. code-block:: cmake
|
|
|
|
check_pie_supported()
|
|
set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
|
|
|
|
.. code-block:: cmake
|
|
|
|
# Retrieve any error message.
|
|
check_pie_supported(OUTPUT_VARIABLE output LANGUAGES C)
|
|
set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
|
|
if(NOT CMAKE_C_LINK_PIE_SUPPORTED)
|
|
message(WARNING "PIE is not supported at link time: ${output}.\n"
|
|
"PIE link options will not be passed to linker.")
|
|
endif()
|
|
|
|
#]=======================================================================]
|
|
|
|
|
|
include (Internal/CMakeCheckCompilerFlag)
|
|
|
|
function (check_pie_supported)
|
|
cmake_policy(GET CMP0083 cmp0083)
|
|
|
|
if (NOT cmp0083)
|
|
message(FATAL_ERROR "check_pie_supported: Policy CMP0083 is not set")
|
|
endif()
|
|
|
|
if(cmp0083 STREQUAL "OLD")
|
|
message(FATAL_ERROR "check_pie_supported: Policy CMP0083 set to OLD")
|
|
endif()
|
|
|
|
set(optional)
|
|
set(one OUTPUT_VARIABLE)
|
|
set(multiple LANGUAGES)
|
|
|
|
cmake_parse_arguments(CHECK_PIE "${optional}" "${one}" "${multiple}" "${ARGN}")
|
|
if(CHECK_PIE_UNPARSED_ARGUMENTS)
|
|
message(FATAL_ERROR "check_pie_supported: Unparsed arguments: ${CHECK_PIE_UNPARSED_ARGUMENTS}")
|
|
endif()
|
|
|
|
if (CHECK_PIE_LANGUAGES)
|
|
set (unsupported_languages "${CHECK_PIE_LANGUAGES}")
|
|
list (REMOVE_ITEM unsupported_languages "C" "CXX" "Fortran")
|
|
if(unsupported_languages)
|
|
message(FATAL_ERROR "check_pie_supported: language(s) '${unsupported_languages}' not supported")
|
|
endif()
|
|
else()
|
|
# User did not set any languages, use defaults
|
|
get_property (enabled_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
|
|
if (NOT enabled_languages)
|
|
return()
|
|
endif()
|
|
|
|
list (FILTER enabled_languages INCLUDE REGEX "^(C|CXX|Fortran)$")
|
|
if (NOT enabled_languages)
|
|
return()
|
|
endif()
|
|
|
|
set (CHECK_PIE_LANGUAGES ${enabled_languages})
|
|
endif()
|
|
|
|
set (outputs)
|
|
|
|
foreach(lang IN LISTS CHECK_PIE_LANGUAGES)
|
|
if(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER)
|
|
cmake_check_compiler_flag(${lang} "${CMAKE_${lang}_LINK_OPTIONS_PIE}"
|
|
CMAKE_${lang}_LINK_PIE_SUPPORTED
|
|
OUTPUT_VARIABLE output)
|
|
if (NOT CMAKE_${lang}_LINK_PIE_SUPPORTED)
|
|
string (APPEND outputs "PIE (${lang}): ${output}\n")
|
|
endif()
|
|
|
|
cmake_check_compiler_flag(${lang} "${CMAKE_${lang}_LINK_OPTIONS_NO_PIE}"
|
|
CMAKE_${lang}_LINK_NO_PIE_SUPPORTED
|
|
OUTPUT_VARIABLE output)
|
|
if (NOT CMAKE_${lang}_LINK_NO_PIE_SUPPORTED)
|
|
string (APPEND outputs "NO_PIE (${lang}): ${output}\n")
|
|
endif()
|
|
else()
|
|
# no support at link time. Set cache variables to NO
|
|
set(CMAKE_${lang}_LINK_PIE_SUPPORTED NO CACHE INTERNAL "PIE (${lang})")
|
|
set(CMAKE_${lang}_LINK_NO_PIE_SUPPORTED NO CACHE INTERNAL "NO_PIE (${lang})")
|
|
string (APPEND outputs "PIE and NO_PIE are not supported by linker for ${lang}")
|
|
endif()
|
|
endforeach()
|
|
|
|
if (CHECK_PIE_OUTPUT_VARIABLE)
|
|
set (${CHECK_PIE_OUTPUT_VARIABLE} "${outputs}" PARENT_SCOPE)
|
|
endif()
|
|
endfunction()
|