Require CMake >= 2.8.9 and update Travis' CMake

The POSITION_INDEPENDENT_CODE target property seems to be supported since
CMake 2.8.9, and Ubuntu 12.04 uses 2.8.7.

.travis.yml

@@ -39,6 +39,7 @@ addons:
   apt:
     sources:
     - ubuntu-toolchain-r-test
+    - george-edison55-precise-backports # more recent CMake
     packages:
     - libconfig++8-dev
     - gdb
@@ -51,6 +52,8 @@ addons:
     - libedit2
     - libedit-dev
     - libcurl3:i386
+    - cmake
+    - cmake-data
 before_install:
   -
     if [ "${TRAVIS_OS_NAME}" = "linux" ]; then

driver/cl_options.cpp

@@ -325,7 +325,7 @@ cl::opt<std::string>
 #endif
 
 cl::opt<llvm::Reloc::Model> mRelocModel(
-    "relocation-model", cl::desc("Relocation model"),
+    "relocation-model", cl::desc("Relocation model"), cl::ZeroOrMore,
 #if LDC_LLVM_VER < 309
     cl::init(llvm::Reloc::Default),
 #endif

runtime/CMakeLists.txt

@@ -1,6 +1,6 @@
 project(runtime)
 
-cmake_minimum_required(VERSION 2.8.5)
+cmake_minimum_required(VERSION 2.8.9)
 
 #
 # Main configuration.
@@ -480,7 +480,12 @@ macro(build_runtime_variants d_flags c_flags ld_flags path_suffix outlist_target
         "${path_suffix}"
         ${outlist_targets}
     )
-    build_profile_runtime ("${d_flags}" "${c_flags}" "${ld_flags}" "${path_suffix}" ${outlist_targets})
+
+    if(LDC_WITH_PGO)
+        build_profile_runtime("${d_flags};${D_FLAGS};${D_FLAGS_RELEASE}" "${c_flags}" "${ld_flags}" "${path_suffix}" ${outlist_targets})
+        get_target_suffix("" "${path_suffix}" target_suffix)
+        set_common_library_properties(ldc-profile-rt${target_suffix})
+    endif()
 endmacro()
 
 # Setup the build of profile-rt

runtime/profile-rt/DefineBuildProfileRT.cmake

@@ -16,8 +16,6 @@ if (LDC_WITH_PGO)
         if (NOT (LDC_LLVM_VER GREATER 309))
             set(PROFRT_EXTRA_LDFLAGS "Ws2_32.lib")
         endif()
-    else()
-        set(PROFRT_EXTRA_FLAGS "-fPIC -O3")
     endif()
 
     CHECK_CXX_SOURCE_COMPILES("
@@ -115,9 +113,4 @@ if (LDC_WITH_PGO)
 
     # Install D interface files to profile-rt.
     install(DIRECTORY ${PROFILERT_DIR}/d/ldc DESTINATION ${INCLUDE_INSTALL_DIR} FILES_MATCHING PATTERN "*.d")
-
-else()
-    # No profiling supported, define NOP macro
-    macro(build_profile_runtime c_flags ld_flags path_suffix outlist_targets)
-    endmacro()
 endif()