diff options
28 files changed, 267 insertions, 50 deletions
diff --git a/Help/command/try_compile.rst b/Help/command/try_compile.rst index f50fcb6..cf9e06f 100644 --- a/Help/command/try_compile.rst +++ b/Help/command/try_compile.rst @@ -134,6 +134,11 @@ default values: If :policy:`CMP0056` is set to ``NEW``, then :variable:`CMAKE_EXE_LINKER_FLAGS` is passed in as well. +If :policy:`CMP0083` is set to ``NEW``, then in order to obtain correct +behavior at link time, the ``check_pie_supported()`` command from the +:module:`CheckPIESupported` module must be called before using the +:command:`try_compile` command. + The current settings of :policy:`CMP0065` and :policy:`CMP0083` are set in the generated project. diff --git a/Help/manual/cmake-modules.7.rst b/Help/manual/cmake-modules.7.rst index 2f08a04..940186a 100644 --- a/Help/manual/cmake-modules.7.rst +++ b/Help/manual/cmake-modules.7.rst @@ -35,6 +35,7 @@ These modules are loaded using the :command:`include` command. /module/CheckIncludeFiles /module/CheckLanguage /module/CheckLibraryExists + /module/CheckPIESupported /module/CheckPrototypeDefinition /module/CheckStructHasMember /module/CheckSymbolExists diff --git a/Help/module/CheckPIESupported.rst b/Help/module/CheckPIESupported.rst new file mode 100644 index 0000000..02e7b43 --- /dev/null +++ b/Help/module/CheckPIESupported.rst @@ -0,0 +1 @@ +.. cmake-module:: ../../Modules/CheckPIESupported.cmake diff --git a/Help/policy/CMP0083.rst b/Help/policy/CMP0083.rst index 7b467b0..b26d6c8 100644 --- a/Help/policy/CMP0083.rst +++ b/Help/policy/CMP0083.rst @@ -17,8 +17,46 @@ is set: passed to the linker step. For example ``-no-pie`` for ``GCC``. * Not set: no flags are passed to the linker step. +Since a given linker may not support ``PIE`` flags in all environments in +which it is used, it is the project's responsibility to use the +:module:`CheckPIESupported` module to check for support to ensure that the +:prop_tgt:`POSITION_INDEPENDENT_CODE` target property for executables will be +honored at link time. + This policy was introduced in CMake version 3.14. CMake version |release| warns when the policy is not set and uses ``OLD`` behavior. Use the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. .. include:: DEPRECATED.txt + +Examples +^^^^^^^^ + +Behave like CMake 3.13 and do not apply any ``PIE`` flags at link stage. + +.. code-block:: cmake + + cmake_minimum_required(VERSION 3.13) + project(foo) + + # ... + + add_executable(foo ...) + set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE) + +Use the :module:`CheckPIESupported` module to detect whether ``PIE`` is +supported by the current linker and environment. Apply ``PIE`` flags only +if the linker supports them. + +.. code-block:: cmake + + cmake_minimum_required(VERSION 3.14) # CMP0083 NEW + project(foo) + + include(CheckPIESupported) + check_pie_supported() + + # ... + + add_executable(foo ...) + set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE) diff --git a/Help/prop_tgt/POSITION_INDEPENDENT_CODE.rst b/Help/prop_tgt/POSITION_INDEPENDENT_CODE.rst index 54af8c6..0aaf66b 100644 --- a/Help/prop_tgt/POSITION_INDEPENDENT_CODE.rst +++ b/Help/prop_tgt/POSITION_INDEPENDENT_CODE.rst @@ -9,3 +9,8 @@ property is ``True`` by default for ``SHARED`` and ``MODULE`` library targets and ``False`` otherwise. This property is initialized by the value of the :variable:`CMAKE_POSITION_INDEPENDENT_CODE` variable if it is set when a target is created. + +.. note:: + + For executable targets, the link step is controlled by the :policy:`CMP0083` + policy and the :module:`CheckPIESupported` module. diff --git a/Help/release/dev/link-option-PIE.rst b/Help/release/dev/link-option-PIE.rst index 824ab2c..872343c 100644 --- a/Help/release/dev/link-option-PIE.rst +++ b/Help/release/dev/link-option-PIE.rst @@ -2,5 +2,8 @@ link-option-PIE --------------- * Required link options to manage Position Independent Executable are now - added when :prop_tgt:`POSITION_INDEPENDENT_CODE` is set. These flags are - controlled by policy :policy:`CMP0083`. + added when :prop_tgt:`POSITION_INDEPENDENT_CODE` is set. The project is + responsible for using the :module:`CheckPIESupported` module to check for + ``PIE`` support to ensure that the :prop_tgt:`POSITION_INDEPENDENT_CODE` + target property will be honored at link time for executables. This behavior + is controlled by policy :policy:`CMP0083`. diff --git a/Modules/CheckPIESupported.cmake b/Modules/CheckPIESupported.cmake new file mode 100644 index 0000000..720217d --- /dev/null +++ b/Modules/CheckPIESupported.cmake @@ -0,0 +1,134 @@ +# 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() diff --git a/Modules/Compiler/AppleClang-C.cmake b/Modules/Compiler/AppleClang-C.cmake index 8754951..a48adec 100644 --- a/Modules/Compiler/AppleClang-C.cmake +++ b/Modules/Compiler/AppleClang-C.cmake @@ -1,9 +1,6 @@ include(Compiler/Clang) __compiler_clang(C) -set(CMAKE_C_LINK_OPTIONS_PIE ${CMAKE_C_COMPILE_OPTIONS_PIE} -Xlinker -pie) -set(CMAKE_C_LINK_OPTIONS_NO_PIE -Xlinker -no_pie) - if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.0) set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90") set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90") diff --git a/Modules/Compiler/AppleClang-CXX.cmake b/Modules/Compiler/AppleClang-CXX.cmake index 54c1388..e5fd647 100644 --- a/Modules/Compiler/AppleClang-CXX.cmake +++ b/Modules/Compiler/AppleClang-CXX.cmake @@ -1,9 +1,6 @@ include(Compiler/Clang) __compiler_clang(CXX) -set(CMAKE_CXX_LINK_OPTIONS_PIE ${CMAKE_CXX_COMPILE_OPTIONS_PIE} -Xlinker -pie) -set(CMAKE_CXX_LINK_OPTIONS_NO_PIE -Xlinker -no_pie) - if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC") set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden") endif() diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake index 7cee9c7..c3f13f3 100644 --- a/Modules/Compiler/Clang.cmake +++ b/Modules/Compiler/Clang.cmake @@ -23,23 +23,9 @@ else() set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE") # Link options for PIE are already set in 'Compiler/GNU.cmake' # but clang may require alternate syntax on some platforms - if (NOT CMAKE_${lang}_FLAG_PIE) - cmake_check_compiler_flag(${lang} "${CMAKE_${lang}_COMPILE_OPTIONS_PIE};-Xlinker;-pie" - CMAKE_${lang}_FLAG_XLINKER_PIE) - if (CMAKE_${lang}_FLAG_XLINKER_PIE) - set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-Xlinker" "-pie") - else() - set(CMAKE_${lang}_LINK_OPTIONS_PIE "") - endif() - endif() - if (NOT CMAKE_${lang}_FLAG_NO_PIE) - cmake_check_compiler_flag(${lang} "-Xlinker;-no_pie" - CMAKE_${lang}_FLAG_XLINKER_NO_PIE) - if (CMAKE_${lang}_FLAG_XLINKER_NO_PIE) - set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-Xlinker" "-no_pie") - else() - set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "") - endif() + if (APPLE) + set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} -Xlinker -pie) + set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE -Xlinker -no_pie) endif() set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ") set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=") diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake index 688a1b5..6b1bd3a 100644 --- a/Modules/Compiler/GNU.cmake +++ b/Modules/Compiler/GNU.cmake @@ -15,23 +15,14 @@ macro(__compiler_gnu lang) # Feature flags. set(CMAKE_${lang}_VERBOSE_FLAG "-v") set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC") + set (_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4) set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE") # Support of PIE at link stage depends on various elements : platform, compiler, linker - # so the easiest way is to check if compiler supports these flags - cmake_check_compiler_flag(${lang} "${CMAKE_${lang}_COMPILE_OPTIONS_PIE};-pie" - CMAKE_${lang}_FLAG_PIE) - if (CMAKE_${lang}_FLAG_PIE) - set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-pie") - else() - set(CMAKE_${lang}_LINK_OPTIONS_PIE "") - endif() - cmake_check_compiler_flag(${lang} "-no-pie" CMAKE_${lang}_FLAG_NO_PIE) - if (CMAKE_${lang}_FLAG_NO_PIE) - set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-no-pie") - else() - set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "") - endif() + # so to activate it, module CheckPIESupported must be used. + set (_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER YES) + set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-pie") + set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-no-pie") endif() if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.0) set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=") diff --git a/Modules/Compiler/SunPro-C.cmake b/Modules/Compiler/SunPro-C.cmake index 75b8fe6..c4aba8e 100644 --- a/Modules/Compiler/SunPro-C.cmake +++ b/Modules/Compiler/SunPro-C.cmake @@ -7,6 +7,7 @@ set(CMAKE_C_VERBOSE_FLAG "-#") set(CMAKE_C_COMPILE_OPTIONS_PIC -KPIC) set(CMAKE_C_COMPILE_OPTIONS_PIE "") +set(_CMAKE_C_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_C_LINK_OPTIONS_PIE "") set(CMAKE_C_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_C_FLAGS "-KPIC") diff --git a/Modules/Compiler/SunPro-CXX.cmake b/Modules/Compiler/SunPro-CXX.cmake index 662ac30..5ce58b2 100644 --- a/Modules/Compiler/SunPro-CXX.cmake +++ b/Modules/Compiler/SunPro-CXX.cmake @@ -7,6 +7,7 @@ set(CMAKE_CXX_VERBOSE_FLAG "-v") set(CMAKE_CXX_COMPILE_OPTIONS_PIC -KPIC) set(CMAKE_CXX_COMPILE_OPTIONS_PIE "") +set(_CMAKE_CXX_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_CXX_LINK_OPTIONS_PIE "") set(CMAKE_CXX_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-KPIC") diff --git a/Modules/Compiler/SunPro-Fortran.cmake b/Modules/Compiler/SunPro-Fortran.cmake index e110253..0c93c94 100644 --- a/Modules/Compiler/SunPro-Fortran.cmake +++ b/Modules/Compiler/SunPro-Fortran.cmake @@ -4,6 +4,7 @@ set(CMAKE_Fortran_FORMAT_FREE_FLAG "-free") set(CMAKE_Fortran_COMPILE_OPTIONS_PIC "-KPIC") set(CMAKE_Fortran_COMPILE_OPTIONS_PIE "") +set(_CMAKE_Fortran_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_Fortran_LINK_OPTIONS_PIE "") set(CMAKE_Fortran_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_Fortran_FLAGS "-KPIC") diff --git a/Modules/Internal/CMakeCheckCompilerFlag.cmake b/Modules/Internal/CMakeCheckCompilerFlag.cmake index ca9b356..9c8dfb6 100644 --- a/Modules/Internal/CMakeCheckCompilerFlag.cmake +++ b/Modules/Internal/CMakeCheckCompilerFlag.cmake @@ -12,12 +12,17 @@ The function does not use the try_compile() command so as to avoid infinite recursion. It may not work for all platforms or toolchains, the caller is responsible for ensuring it is only called in valid situations. + cmake_check_compiler_flag(<lang> <flag> <result> + [SRC_EXT <ext>] [COMMAND_PATTERN <pattern>] + [FAIL_REGEX <regex> ...] + [OUTPUT_VARIABLE <output>]) + Parameters: - lang - Language to check. - flag - The flag to add to the compile/link command line. - result - Boolean output variable. It will be stored in the cache as an - internal variable and if true, will cause future tests that assign - to that variable to be bypassed. + <lang> - Language to check. + <flag> - The flag to add to the compile/link command line. + <result> - Boolean output variable. It will be stored in the cache as an + internal variable and if true, will cause future tests that assign + to that variable to be bypassed. Optional parameters: SRC_EXT - Overrides the extension of the source file used for the @@ -28,7 +33,7 @@ Optional parameters: the output, give a failed result for the check. A common set of regular expressions will be included in addition to those given by FAIL_REGEX. - + OUTPUT_VARIABLE - Set <output> variable with details about any error. #]=] include_guard(GLOBAL) @@ -58,7 +63,7 @@ function(CMAKE_CHECK_COMPILER_FLAG lang flag result) set(check_lang ${lang}) endif() - cmake_parse_arguments(CCCF "" "SRC_EXT;COMMAND_PATTERN" "FAIL_REGEX" ${ARGN}) + cmake_parse_arguments(CCCF "" "SRC_EXT;COMMAND_PATTERN;OUTPUT_VARIABLE" "FAIL_REGEX" ${ARGN}) if (NOT CCCF_COMMAND_PATTERN) set (CCCF_COMMAND_PATTERN "<FLAG> -o <OUTPUT> <SOURCE>") @@ -95,6 +100,10 @@ function(CMAKE_CHECK_COMPILER_FLAG lang flag result) endif() endif() + if (CCCF_OUTPUT_VARIABLE) + unset(${CCCF_OUTPUT_VARIABLE} PARENT_SCOPE) + endif() + # Compute the directory in which to run the test. set(COMPILER_FLAG_DIR "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp") # Compute source and output files. @@ -139,6 +148,9 @@ function(CMAKE_CHECK_COMPILER_FLAG lang flag result) "Determining if the ${flag} option " "is supported for ${lang} language failed with the following output:\n" "${COMPILER_FLAG_OUTPUT}\n") + if (CCCF_OUTPUT_VARIABLE) + set(${CCCF_OUTPUT_VARIABLE} "${COMPILER_FLAG_OUTPUT}" PARENT_SCOPE) + endif() return() endif() diff --git a/Modules/Platform/CYGWIN-GNU.cmake b/Modules/Platform/CYGWIN-GNU.cmake index f55b80d..ca90712 100644 --- a/Modules/Platform/CYGWIN-GNU.cmake +++ b/Modules/Platform/CYGWIN-GNU.cmake @@ -27,6 +27,7 @@ macro(__cygwin_compiler_gnu lang) # No -fPIC on cygwin set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "") set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "") + set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_${lang}_LINK_OPTIONS_PIE "") set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "") diff --git a/Modules/Platform/Fuchsia.cmake b/Modules/Platform/Fuchsia.cmake index 7b33434..4b13805 100644 --- a/Modules/Platform/Fuchsia.cmake +++ b/Modules/Platform/Fuchsia.cmake @@ -3,6 +3,7 @@ set(FUCHSIA 1) set(CMAKE_DL_LIBS "") set(CMAKE_C_COMPILE_OPTIONS_PIC "-fPIC") set(CMAKE_C_COMPILE_OPTIONS_PIE "-fPIE") +set(_CMAKE_C_PIE_MAY_BE_SUPPORTED_BY_LINKER YES) set(CMAKE_C_LINK_OPTIONS_PIE ${CMAKE_C_COMPILE_OPTIONS_PIE} "-pie") set(CMAKE_C_LINK_OPTIONS_NO_PIE "-no-pie") set(CMAKE_SHARED_LIBRARY_C_FLAGS "-fPIC") diff --git a/Modules/Platform/Linux-Intel.cmake b/Modules/Platform/Linux-Intel.cmake index ab22b1d..3b5ca59 100644 --- a/Modules/Platform/Linux-Intel.cmake +++ b/Modules/Platform/Linux-Intel.cmake @@ -23,7 +23,9 @@ endif() macro(__linux_compiler_intel lang) set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC") set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE") + set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) if (NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 13.0) + set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER YES) set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-pie") set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-no-pie") endif() diff --git a/Modules/Platform/Linux-PGI.cmake b/Modules/Platform/Linux-PGI.cmake index 3e7e391..0341654 100644 --- a/Modules/Platform/Linux-PGI.cmake +++ b/Modules/Platform/Linux-PGI.cmake @@ -12,6 +12,7 @@ macro(__linux_compiler_pgi lang) # Shared library compile and link flags. set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC") set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "") + set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_${lang}_LINK_OPTIONS_PIE "") set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC") diff --git a/Modules/Platform/SINIX.cmake b/Modules/Platform/SINIX.cmake index e44ceef..e3b0a05 100644 --- a/Modules/Platform/SINIX.cmake +++ b/Modules/Platform/SINIX.cmake @@ -1,5 +1,6 @@ set(CMAKE_C_COMPILE_OPTIONS_PIC -K PIC) set(CMAKE_C_COMPILE_OPTIONS_PIE "") +set(_CMAKE_C_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_C_LINK_OPTIONS_PIE "") set(CMAKE_C_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_C_FLAGS "-K PIC") diff --git a/Modules/Platform/UNIX_SV.cmake b/Modules/Platform/UNIX_SV.cmake index 433daf3..bd1ffce 100644 --- a/Modules/Platform/UNIX_SV.cmake +++ b/Modules/Platform/UNIX_SV.cmake @@ -1,5 +1,6 @@ set(CMAKE_C_COMPILE_OPTIONS_PIC -K PIC) set(CMAKE_C_COMPILE_OPTIONS_PIE "") +set(_CMAKE_C_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_C_LINK_OPTIONS_PIE "") set(CMAKE_C_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_C_FLAGS "-K PIC") diff --git a/Modules/Platform/UnixWare.cmake b/Modules/Platform/UnixWare.cmake index 8c9d430..94888d9 100644 --- a/Modules/Platform/UnixWare.cmake +++ b/Modules/Platform/UnixWare.cmake @@ -1,5 +1,6 @@ set(CMAKE_C_COMPILE_OPTIONS_PIC -K PIC) set(CMAKE_C_COMPILE_OPTIONS_PIE "") +set(_CMAKE_C_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_C_LINK_OPTIONS_PIE "") set(CMAKE_C_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_C_FLAGS "-K PIC") diff --git a/Modules/Platform/Windows-GNU.cmake b/Modules/Platform/Windows-GNU.cmake index 2e854e5..71189b1 100644 --- a/Modules/Platform/Windows-GNU.cmake +++ b/Modules/Platform/Windows-GNU.cmake @@ -72,6 +72,7 @@ macro(__windows_compiler_gnu lang) # No -fPIC on Windows set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "") set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "") + set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) set(CMAKE_${lang}_LINK_OPTIONS_PIE "") set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "") set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "") diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx index 541ae76..f9b494e 100644 --- a/Source/cmCoreTryCompile.cxx +++ b/Source/cmCoreTryCompile.cxx @@ -24,10 +24,18 @@ static std::string const kCMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN = "CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN"; static std::string const kCMAKE_C_COMPILER_TARGET = "CMAKE_C_COMPILER_TARGET"; +static std::string const kCMAKE_C_LINK_NO_PIE_SUPPORTED = + "CMAKE_C_LINK_NO_PIE_SUPPORTED"; +static std::string const kCMAKE_C_LINK_PIE_SUPPORTED = + "CMAKE_C_LINK_PIE_SUPPORTED"; static std::string const kCMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN = "CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN"; static std::string const kCMAKE_CXX_COMPILER_TARGET = "CMAKE_CXX_COMPILER_TARGET"; +static std::string const kCMAKE_CXX_LINK_NO_PIE_SUPPORTED = + "CMAKE_CXX_LINK_NO_PIE_SUPPORTED"; +static std::string const kCMAKE_CXX_LINK_PIE_SUPPORTED = + "CMAKE_CXX_LINK_PIE_SUPPORTED"; static std::string const kCMAKE_ENABLE_EXPORTS = "CMAKE_ENABLE_EXPORTS"; static std::string const kCMAKE_LINK_SEARCH_END_STATIC = "CMAKE_LINK_SEARCH_END_STATIC"; @@ -633,6 +641,16 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv, vars.insert(varList.begin(), varList.end()); } + if (this->Makefile->GetPolicyStatus(cmPolicies::CMP0083) == + cmPolicies::NEW) { + // To ensure full support of PIE, propagate cache variables + // driving the link options + vars.insert(kCMAKE_C_LINK_PIE_SUPPORTED); + vars.insert(kCMAKE_C_LINK_NO_PIE_SUPPORTED); + vars.insert(kCMAKE_CXX_LINK_PIE_SUPPORTED); + vars.insert(kCMAKE_CXX_LINK_NO_PIE_SUPPORTED); + } + /* for the TRY_COMPILEs we want to be able to specify the architecture. So the user can set CMAKE_OSX_ARCHITECTURES to i386;ppc and then set CMAKE_TRY_COMPILE_OSX_ARCHITECTURES first to i386 and then to ppc to diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx index da48950..8fac039 100644 --- a/Source/cmLocalGenerator.cxx +++ b/Source/cmLocalGenerator.cxx @@ -2044,8 +2044,14 @@ void cmLocalGenerator::AppendPositionIndependentLinkerFlags( return; } - std::string name = "CMAKE_" + lang + "_LINK_OPTIONS_"; - name += cmSystemTools::IsOn(PICValue) ? "PIE" : "NO_PIE"; + const std::string mode = cmSystemTools::IsOn(PICValue) ? "PIE" : "NO_PIE"; + + std::string supported = "CMAKE_" + lang + "_LINK_" + mode + "_SUPPORTED"; + if (cmSystemTools::IsOff(this->Makefile->GetDefinition(supported))) { + return; + } + + std::string name = "CMAKE_" + lang + "_LINK_OPTIONS_" + mode; auto pieFlags = this->Makefile->GetSafeDefinition(name); if (pieFlags.empty()) { diff --git a/Tests/RunCMake/PositionIndependentCode/CMP0083.cmake b/Tests/RunCMake/PositionIndependentCode/CMP0083.cmake index 9713ea4..749ac79 100644 --- a/Tests/RunCMake/PositionIndependentCode/CMP0083.cmake +++ b/Tests/RunCMake/PositionIndependentCode/CMP0083.cmake @@ -6,6 +6,8 @@ add_executable (cmp0083_ref main.cpp) set (CMAKE_POSITION_INDEPENDENT_CODE ON) cmake_policy(SET CMP0083 NEW) +include(CheckPIESupported) +check_pie_supported() add_executable (cmp0083_new_pie main.cpp) diff --git a/Tests/RunCMake/PositionIndependentCode/CheckPIESupported.cmake b/Tests/RunCMake/PositionIndependentCode/CheckPIESupported.cmake index 1e0a2c9..61e1b6d 100644 --- a/Tests/RunCMake/PositionIndependentCode/CheckPIESupported.cmake +++ b/Tests/RunCMake/PositionIndependentCode/CheckPIESupported.cmake @@ -1,11 +1,17 @@ -if (CMAKE_CXX_LINK_OPTIONS_PIE) +cmake_policy(SET CMP0083 NEW) + +include (CheckPIESupported) + +check_pie_supported() + +if (CMAKE_CXX_LINK_PIE_SUPPORTED) file(WRITE "${PIE_SUPPORTED}" "\nset(PIE_SUPPORTED TRUE)\n") else() file(WRITE "${PIE_SUPPORTED}" "\nset(PIE_SUPPORTED FALSE)\n") endif() -if (CMAKE_CXX_LINK_OPTIONS_NO_PIE) +if (CMAKE_CXX_LINK_NO_PIE_SUPPORTED) file(APPEND "${PIE_SUPPORTED}" "\nset(NO_PIE_SUPPORTED TRUE)\n") else() file(APPEND "${PIE_SUPPORTED}" "\nset(NO_PIE_SUPPORTED FALSE)\n") diff --git a/Tests/RunCMake/PositionIndependentCode/PIE.cmake b/Tests/RunCMake/PositionIndependentCode/PIE.cmake index a9d579d..16ed89c 100644 --- a/Tests/RunCMake/PositionIndependentCode/PIE.cmake +++ b/Tests/RunCMake/PositionIndependentCode/PIE.cmake @@ -1,6 +1,9 @@ cmake_policy(SET CMP0083 NEW) +include(CheckPIESupported) +check_pie_supported() + add_executable (pie_on main.cpp) set_property(TARGET pie_on PROPERTY POSITION_INDEPENDENT_CODE ON) |