From: Hans Wennborg <hans@hanshq.net>
Date: Thu, 13 Nov 2014 00:35:23 +0000 (+0000)
Subject: CMake: Set HOST_LINK_VERSION on Darwin (PR21268)
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=94a9396ff7f0e33ac112038deec844d6fc94d0e8;p=clang

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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@221844 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fbff5add48..fe0d5f2621 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -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
   ${CLANG_BINARY_DIR}/include/clang/Config/config.h)
diff --git a/include/clang/Config/config.h.cmake b/include/clang/Config/config.h.cmake
index 7629ef9129..38b398cffd 100644
--- a/include/clang/Config/config.h.cmake
+++ b/include/clang/Config/config.h.cmake
@@ -26,4 +26,7 @@
 /* The LLVM product name and version */
 #define BACKEND_PACKAGE_STRING "${BACKEND_PACKAGE_STRING}"
 
+/* Linker version detected at compile time. */
+#cmakedefine HOST_LINK_VERSION "${HOST_LINK_VERSION}"
+
 #endif
diff --git a/include/clang/Config/config.h.in b/include/clang/Config/config.h.in
index 1530fefaa5..3c2cb075ef 100644
--- a/include/clang/Config/config.h.in
+++ b/include/clang/Config/config.h.in
@@ -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
diff --git a/test/Driver/darwin-ld-demangle.c b/test/Driver/darwin-ld-demangle.c
new file mode 100644
index 0000000000..1eef3c7032
--- /dev/null
+++ b/test/Driver/darwin-ld-demangle.c
@@ -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