From e3568b4b3d922e623c61eacf5d6924be05b522e8 Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sun, 11 Jun 2017 23:59:24 +0000
Subject: build: use POSITION_INDEPENDENT_CODE CMake property

Use the POSITION_INDEPENDENT_CODE target property to indicate that we
should be building with -fPIC or the equivalent flag based on the
toolchain that we are using.  This makes the check more portable and
simplifies the flags management.  Because we don't want this setting to
propagate in the case of an in-tree build, set the property on the
targets we construct explicitly rather than setting
CMAKE_POSITION_INDEPENDENT_CODE to ON globally.

llvm-svn: 305174
---
 libcxxabi/cmake/config-ix.cmake |  1 -
 libcxxabi/src/CMakeLists.txt    | 38 +++++++++++++++++++++++---------------
 2 files changed, 23 insertions(+), 16 deletions(-)

(limited to 'libcxxabi')

diff --git a/libcxxabi/cmake/config-ix.cmake b/libcxxabi/cmake/config-ix.cmake
index 6d1c870..319cdde 100644
--- a/libcxxabi/cmake/config-ix.cmake
+++ b/libcxxabi/cmake/config-ix.cmake
@@ -50,7 +50,6 @@ endif ()
 
 # Check compiler flags
 check_c_compiler_flag(-funwind-tables         LIBCXXABI_HAS_FUNWIND_TABLES)
-check_cxx_compiler_flag(-fPIC                 LIBCXXABI_HAS_FPIC_FLAG)
 check_cxx_compiler_flag(-fno-exceptions       LIBCXXABI_HAS_NO_EXCEPTIONS_FLAG)
 check_cxx_compiler_flag(-fno-rtti             LIBCXXABI_HAS_NO_RTTI_FLAG)
 check_cxx_compiler_flag(-fstrict-aliasing     LIBCXXABI_HAS_FSTRICT_ALIASING_FLAG)
diff --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
index ac2c3a6..d4a68fc 100644
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -77,7 +77,6 @@ if (MINGW)
 endif()
 
 # Setup flags.
-add_compile_flags_if_supported(-fPIC)
 add_link_flags_if_supported(-nodefaultlibs)
 
 set(LIBCXXABI_SHARED_LINK_FLAGS)
@@ -110,11 +109,12 @@ endif()
 
 # Add a object library that contains the compiled source files.
 add_library(cxxabi_objects OBJECT ${LIBCXXABI_SOURCES} ${LIBCXXABI_HEADERS})
-
 set_target_properties(cxxabi_objects
-  PROPERTIES
-    COMPILE_FLAGS "${LIBCXXABI_COMPILE_FLAGS}"
-  )
+                      PROPERTIES
+                        COMPILE_FLAGS
+                          "${LIBCXXABI_COMPILE_FLAGS}"
+                        POSITION_INDEPENDENT_CODE
+                          ON)
 
 set(LIBCXXABI_TARGETS)
 
@@ -123,12 +123,17 @@ if (LIBCXXABI_ENABLE_SHARED)
   add_library(cxxabi_shared SHARED $<TARGET_OBJECTS:cxxabi_objects>)
   target_link_libraries(cxxabi_shared ${LIBCXXABI_LIBRARIES})
   set_target_properties(cxxabi_shared
-    PROPERTIES
-      LINK_FLAGS    "${LIBCXXABI_LINK_FLAGS} ${LIBCXXABI_SHARED_LINK_FLAGS}"
-      OUTPUT_NAME   "c++abi"
-      VERSION       "1.0"
-      SOVERSION     "1"
-    )
+                        PROPERTIES
+                          LINK_FLAGS
+                            "${LIBCXXABI_LINK_FLAGS} ${LIBCXXABI_SHARED_LINK_FLAGS}"
+                          OUTPUT_NAME
+                            "c++abi"
+                          POSITION_INDEPENDENT_CODE
+                            ON
+                          SOVERSION
+                            "1"
+                          VERSION
+                            "1.0")
   list(APPEND LIBCXXABI_TARGETS "cxxabi_shared")
 endif()
 
@@ -137,10 +142,13 @@ if (LIBCXXABI_ENABLE_STATIC)
   add_library(cxxabi_static STATIC $<TARGET_OBJECTS:cxxabi_objects>)
   target_link_libraries(cxxabi_static ${LIBCXXABI_LIBRARIES})
   set_target_properties(cxxabi_static
-    PROPERTIES
-      LINK_FLAGS    "${LIBCXXABI_LINK_FLAGS}"
-      OUTPUT_NAME   "c++abi"
-  )
+                        PROPERTIES
+                          LINK_FLAGS
+                            "${LIBCXXABI_LINK_FLAGS}"
+                          OUTPUT_NAME
+                            "c++abi"
+                          POSITION_INDEPENDENT_CODE
+                            ON)
   list(APPEND LIBCXXABI_TARGETS "cxxabi_static")
 endif()
 
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