POSITION_INDEPENDENT_CODE: Manage link flags for executables

Fixes: #14983, #16561

7 files changed, 48 insertions, 0 deletions

diff --git a/Modules/Compiler/AppleClang-C.cmake b/Modules/Compiler/AppleClang-C.cmake
index a48adec..8754951 100644
--- a/Modules/Compiler/AppleClang-C.cmake
+++ b/Modules/Compiler/AppleClang-C.cmake
@@ -1,6 +1,9 @@
 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 e5fd647..54c1388 100644
--- a/Modules/Compiler/AppleClang-CXX.cmake
+++ b/Modules/Compiler/AppleClang-CXX.cmake
@@ -1,6 +1,9 @@
 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 e23470b..7cee9c7 100644
--- a/Modules/Compiler/Clang.cmake
+++ b/Modules/Compiler/Clang.cmake
@@ -21,6 +21,26 @@ else()
   macro(__compiler_clang lang)
     __compiler_gnu(${lang})
     set(CMAKE_${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_${lang}_LINK_OPTIONS_NO_PIE "")
+      endif()
+    endif()
     set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
     set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
     if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4.0)
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index 4491d4b..688a1b5 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -9,6 +9,7 @@ endif()
 set(__COMPILER_GNU 1)
 
 include(Compiler/CMakeCommonCompilerMacros)
+include(Internal/CMakeCheckCompilerFlag)
 
 macro(__compiler_gnu lang)
   # Feature flags.
@@ -16,6 +17,21 @@ macro(__compiler_gnu lang)
   set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
   if(NOT CMAKE_${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()
   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 1988aae..75b8fe6 100644
--- a/Modules/Compiler/SunPro-C.cmake
+++ b/Modules/Compiler/SunPro-C.cmake
@@ -7,6 +7,8 @@ set(CMAKE_C_VERBOSE_FLAG "-#")
 
 set(CMAKE_C_COMPILE_OPTIONS_PIC -KPIC)
 set(CMAKE_C_COMPILE_OPTIONS_PIE "")
+set(CMAKE_C_LINK_OPTIONS_PIE "")
+set(CMAKE_C_LINK_OPTIONS_NO_PIE "")
 set(CMAKE_SHARED_LIBRARY_C_FLAGS "-KPIC")
 set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-G")
 set(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-R")
diff --git a/Modules/Compiler/SunPro-CXX.cmake b/Modules/Compiler/SunPro-CXX.cmake
index f463be3..662ac30 100644
--- a/Modules/Compiler/SunPro-CXX.cmake
+++ b/Modules/Compiler/SunPro-CXX.cmake
@@ -7,6 +7,8 @@ set(CMAKE_CXX_VERBOSE_FLAG "-v")
 
 set(CMAKE_CXX_COMPILE_OPTIONS_PIC -KPIC)
 set(CMAKE_CXX_COMPILE_OPTIONS_PIE "")
+set(CMAKE_CXX_LINK_OPTIONS_PIE "")
+set(CMAKE_CXX_LINK_OPTIONS_NO_PIE "")
 set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-KPIC")
 set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-G")
 set(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG "-R")
diff --git a/Modules/Compiler/SunPro-Fortran.cmake b/Modules/Compiler/SunPro-Fortran.cmake
index d3a415f..e110253 100644
--- a/Modules/Compiler/SunPro-Fortran.cmake
+++ b/Modules/Compiler/SunPro-Fortran.cmake
@@ -4,6 +4,8 @@ set(CMAKE_Fortran_FORMAT_FREE_FLAG "-free")
 
 set(CMAKE_Fortran_COMPILE_OPTIONS_PIC "-KPIC")
 set(CMAKE_Fortran_COMPILE_OPTIONS_PIE "")
+set(CMAKE_Fortran_LINK_OPTIONS_PIE "")
+set(CMAKE_Fortran_LINK_OPTIONS_NO_PIE "")
 set(CMAKE_SHARED_LIBRARY_Fortran_FLAGS "-KPIC")
 set(CMAKE_SHARED_LIBRARY_CREATE_Fortran_FLAGS "-G")
 set(CMAKE_SHARED_LIBRARY_RUNTIME_Fortran_FLAG "-R")