r221844 - CMake: Set HOST_LINK_VERSION on Darwin (PR21268)

[Hans Wennborg]

Author: hans
Date: Wed Nov 12 18:35:23 2014
New Revision: 221844

URL: http://llvm.org/viewvc/llvm-project?rev=221844&view=rev
Log:
CMake: Set HOST_LINK_VERSION on Darwin (PR21268)

The Autoconf build already does this, but it was never ported to
CMake. The host linker version affects the flags that Clang pass
to the linker, notably whether it passes -demangle or not.

http://reviews.llvm.org/D6239

Added:
    cfe/trunk/test/Driver/darwin-ld-demangle.c
Modified:
    cfe/trunk/CMakeLists.txt
    cfe/trunk/include/clang/Config/config.h.cmake
    cfe/trunk/include/clang/Config/config.h.in

Modified: cfe/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/CMakeLists.txt?rev=221844&r1=221843&r2=221844&view=diff
==============================================================================
--- cfe/trunk/CMakeLists.txt (original)
+++ cfe/trunk/CMakeLists.txt Wed Nov 12 18:35:23 2014
@@ -253,6 +253,26 @@ if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
   endif()
 endif ()
 
+# Determine HOST_LINK_VERSION on Darwin.
+set(HOST_LINK_VERSION)
+if (APPLE)
+  set(LD_V_OUTPUT)
+  execute_process(
+    COMMAND sh -c "${CMAKE_LINKER} -v 2>&1 | head -1"
+    RESULT_VARIABLE HAD_ERROR
+    OUTPUT_VARIABLE LD_V_OUTPUT
+  )
+  if (NOT HAD_ERROR)
+    if ("${LD_V_OUTPUT}" MATCHES ".*ld64.*")
+      string(REGEX REPLACE ".*ld64-([0-9.]*).*" "\\1" HOST_LINK_VERSION ${LD_V_OUTPUT})
+    else()
+      string(REGEX REPLACE "[^0-9]*([0-9.]*).*" "\\1" HOST_LINK_VERSION ${LD_V_OUTPUT})
+    endif()
+  else()
+    message(FATAL_ERROR "${CMAKE_LINKER} failed with status ${HAD_ERROR}")
+  endif()
+endif()
+
 configure_file(
   ${CLANG_SOURCE_DIR}/include/clang/Config/config.h.cmake
   ${CLANG_BINARY_DIR}/include/clang/Config/config.h)

Modified: cfe/trunk/include/clang/Config/config.h.cmake
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Config/config.h.cmake?rev=221844&r1=221843&r2=221844&view=diff
==============================================================================
--- cfe/trunk/include/clang/Config/config.h.cmake (original)
+++ cfe/trunk/include/clang/Config/config.h.cmake Wed Nov 12 18:35:23 2014
@@ -26,4 +26,7 @@
 /* The LLVM product name and version */
 #define BACKEND_PACKAGE_STRING "${BACKEND_PACKAGE_STRING}"
 
+/* Linker version detected at compile time. */
+#cmakedefine HOST_LINK_VERSION "${HOST_LINK_VERSION}"
+
 #endif

Modified: cfe/trunk/include/clang/Config/config.h.in
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Config/config.h.in?rev=221844&r1=221843&r2=221844&view=diff
==============================================================================
--- cfe/trunk/include/clang/Config/config.h.in (original)
+++ cfe/trunk/include/clang/Config/config.h.in Wed Nov 12 18:35:23 2014
@@ -14,9 +14,6 @@
 /* Directories clang will search for headers */
 #undef C_INCLUDE_DIRS
 
-/* Linker version detected at compile time. */
-#undef HOST_LINK_VERSION
-
 /* Default <path> to all compiler invocations for --sysroot=<path>. */
 #undef DEFAULT_SYSROOT
 
@@ -31,4 +28,7 @@
 /* The LLVM product name and version */
 #define BACKEND_PACKAGE_STRING PACKAGE_STRING
 
+/* Linker version detected at compile time. */
+#undef HOST_LINK_VERSION
+
 #endif

Added: cfe/trunk/test/Driver/darwin-ld-demangle.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/darwin-ld-demangle.c?rev=221844&view=auto
==============================================================================
--- cfe/trunk/test/Driver/darwin-ld-demangle.c (added)
+++ cfe/trunk/test/Driver/darwin-ld-demangle.c Wed Nov 12 18:35:23 2014
@@ -0,0 +1,8 @@
+// REQUIRES: system-darwin
+
+// On Darwin, -demangle is passed to the linker of HOST_LINK_VERSION
+// is high enough. It is assumed to be high enough on systems where
+// this test gets run.
+
+// RUN: %clang -### %s 2>&1 | FileCheck %s
+// CHECK: -demangle