[libc++] Do not force building with -fPIC

Summary:
Whether we build with -fPIC should be specified by the
CMAKE_POSITION_INDEPENDENT_CODE option at configure time.
Note that this patch doesn't change the behavior when building
by default, since -fPIC is used for shared libraries by default.

Reviewers: EricWF

Subscribers: mgorny, christof, jkorous, dexonsmith, libcxx-commits

Differential Revision: https://reviews.llvm.org/D59146

llvm-svn: 355746

diff --git a/libcxx/lib/CMakeLists.txt b/libcxx/lib/CMakeLists.txt
index 22a9bf3..1b10bc6 100644 (file)
--- a/libcxx/lib/CMakeLists.txt
+++ b/libcxx/lib/CMakeLists.txt
@@ -105,10 +105,6 @@ if (LIBCXXABI_USE_LLVM_UNWINDER)
 endif()
 
 # Setup flags.
-if (NOT WIN32)
-  add_flags_if_supported(-fPIC)
-endif()
-
 add_link_flags_if_supported(-nodefaultlibs)
 
 if (LIBCXX_TARGETING_MSVC)