Handling position independent code

PrecompiledHeader.cmake

@@ -64,6 +64,13 @@ macro(combine_arguments _variable)
 endmacro()
 
 function(export_all_flags _filename mode)
+  get_target_property(_target_type ${_target} TYPE)
+  if(_target_type STREQUAL "EXECUTABLE")
+    set(_pic "$<$<BOOL:$<TARGET_PROPERTY:${_target},POSITION_INDEPENDENT_CODE>>:-fPIE\n>")
+  else()
+    set(_pic "$<$<BOOL:$<TARGET_PROPERTY:${_target},POSITION_INDEPENDENT_CODE>>:-fPIC\n>")
+  endif()
+
   set(_include_directories "$<TARGET_PROPERTY:${_target},INCLUDE_DIRECTORIES>")
   set(_compile_definitions "$<TARGET_PROPERTY:${_target},COMPILE_DEFINITIONS>")
   set(_compile_flags "$<TARGET_PROPERTY:${_target},COMPILE_FLAGS>")
@@ -100,7 +107,7 @@ function(export_all_flags _filename mode)
   endif()
   set(_standard_check "${_standard_check}\n")
 
-  file(GENERATE OUTPUT "${_filename}" CONTENT "${_compile_definitions}${_include_directories}${_compile_flags}${_compile_options}${_standard_check}\n")
+  file(GENERATE OUTPUT "${_filename}" CONTENT "${_compile_definitions}${_include_directories}${_compile_flags}${_compile_options}${_standard_check}${_pic}\n")
 endfunction()
 
 function (gcc_pch_targets_for_mode _input _pch_path mode)

test/cxx-pic-shared/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.3)
+cmake_policy(SET CMP0058 NEW)
+enable_testing()
+project(test-cxx-pic-shared)
+include(../../PrecompiledHeader.cmake)
+if(MSVC)
+  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+  set(pch_source test-pch.cpp)
+endif()
+set(CMAKE_CXX_FLAGS "${CMAKH_CXX_FLAGS} -Werror")
+set(CMAKE_C_FLAGS "${CMAKH_CXX_FLAGS} -Werror")
+add_library(test-cxx-pic-lib SHARED test-cxx-lib.cpp test-pch.h ${pch_source})
+add_precompiled_header(test-cxx-pic-lib test-pch.h FORCEINCLUDE)
+add_executable(test-cxx-pic-shared test-cxx.cpp)
+target_link_libraries(test-cxx-pic-shared test-cxx-pic-lib)
+add_test(test-cxx-pic-shared test-cxx-pic-shared)

test/cxx-pic-shared/test-cxx-lib.cpp

@@ -0,0 +1,4 @@
+#ifndef PCH
+#error Missing precompiled header
+#endif
+int foo() { return 1; }

test/cxx-pic-shared/test-cxx.cpp

@@ -0,0 +1,5 @@
+#include "test-pch.h"
+#ifndef PCH
+#error Missing precompiled header
+#endif
+int main() { return foo() == 1 && !(PCH == atoi(getenv("EXPECTED_PCH"))); }

test/cxx-pic-shared/test-pch.cpp

@@ -0,0 +1 @@
+#include "test-pch.h"

test/cxx-pic-shared/test-pch.h

@@ -0,0 +1,7 @@
+#define PCH 1
+#ifdef __cplusplus
+#include <cstdlib>
+#else
+#include <stdlib.h>
+#endif
+int foo();

test/cxx-pic/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.3)
+cmake_policy(SET CMP0058 NEW)
+enable_testing()
+project(test-cxx-pic)
+include(../../PrecompiledHeader.cmake)
+if(MSVC)
+  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+  set(pch_source test-pch.cpp)
+endif()
+set(CMAKE_CXX_FLAGS "${CMAKH_CXX_FLAGS} -Werror")
+set(CMAKE_C_FLAGS "${CMAKH_CXX_FLAGS} -Werror")
+add_library(test-cxx-pic-lib STATIC test-cxx-lib.cpp test-pch.h ${pch_source})
+set_target_properties(test-cxx-pic-lib PROPERTIES POSITION_INDEPENDENT_CODE ON)
+add_precompiled_header(test-cxx-pic-lib test-pch.h FORCEINCLUDE)
+add_executable(test-cxx-pic test-cxx.cpp)
+target_link_libraries(test-cxx-pic test-cxx-pic-lib)
+add_test(test-cxx-pic test-cxx-pic)

test/cxx-pic/test-cxx-lib.cpp

@@ -0,0 +1,4 @@
+#ifndef PCH
+#error Missing precompiled header
+#endif
+int foo() { return 1; }

test/cxx-pic/test-cxx.cpp

@@ -0,0 +1,5 @@
+#include "test-pch.h"
+#ifndef PCH
+#error Missing precompiled header
+#endif
+int main() { return foo() == 1 && !(PCH == atoi(getenv("EXPECTED_PCH"))); }

test/cxx-pic/test-pch.cpp

@@ -0,0 +1 @@
+#include "test-pch.h"

test/cxx-pic/test-pch.h

@@ -0,0 +1,7 @@
+#define PCH 1
+#ifdef __cplusplus
+#include <cstdlib>
+#else
+#include <stdlib.h>
+#endif
+int foo();

test/cxx-pie/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.3)
+cmake_policy(SET CMP0058 NEW)
+enable_testing()
+project(test-cxx-pie)
+include(../../PrecompiledHeader.cmake)
+if(MSVC)
+  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+  set(pch_source test-pch.cpp)
+endif()
+set(CMAKE_CXX_FLAGS "${CMAKH_CXX_FLAGS} -Werror")
+set(CMAKE_C_FLAGS "${CMAKH_CXX_FLAGS} -Werror")
+add_executable(test-cxx-pie test-cxx.cpp test-pch.h ${pch_source})
+set_target_properties(test-cxx-pie PROPERTIES POSITION_INDEPENDENT_CODE ON)
+add_precompiled_header(test-cxx-pie test-pch.h FORCEINCLUDE)
+add_test(test-cxx-pie test-cxx-pie)

test/cxx-pie/test-cxx.cpp

@@ -0,0 +1,4 @@
+#ifndef PCH
+#error Missing precompiled header
+#endif
+int main() { return !(PCH == atoi(getenv("EXPECTED_PCH"))); }

test/cxx-pie/test-pch.cpp

@@ -0,0 +1 @@
+#include "test-pch.h"

test/cxx-pie/test-pch.h

@@ -0,0 +1,6 @@
+#define PCH 1
+#ifdef __cplusplus
+#include <cstdlib>
+#else
+#include <stdlib.h>
+#endif