From ee0f32d723431cdae943e8a8d45ecdb856a0e76c Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Wed, 11 Aug 2010 23:53:59 +0000
Subject: configure: Add detection of the linker version string.  - Review
 appreciated, as long as you understand that I understand that this is    a
 horrible hack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110883 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/m4/link_options.m4 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'autoconf/m4')

diff --git a/autoconf/m4/link_options.m4 b/autoconf/m4/link_options.m4
index b48710c094..4c5f2f435d 100644
--- a/autoconf/m4/link_options.m4
+++ b/autoconf/m4/link_options.m4
@@ -1,3 +1,24 @@
+#
+# Get the linker version string.
+#
+# This macro is specific to LLVM.
+#
+AC_DEFUN([AC_LINK_GET_VERSION],
+  [AC_CACHE_CHECK([for linker version],[llvm_cv_link_version],
+  [
+   version_string="$(ld -v 2>&1 | head -1)"
+
+   # Check for ld64.
+   if (echo "$version_string" | grep -q "ld64"); then
+     llvm_cv_link_version=$(echo "$version_string" | sed -e "s#.*ld64-\([^ ]*\)#\1#")
+   else
+     llvm_cv_link_version=$(echo "$version_string" | sed -e "s#[^0-9]*\([0-9.]*\).*#\1#")
+   fi
+  ])
+  AC_DEFINE_UNQUOTED([HOST_LINK_VERSION],"$llvm_cv_link_version",
+                     [Linker version detected at compile time.])
+])
+
 #
 # Determine if the system can handle the -R option being passed to the linker.
 #
-- 
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