# HG changeset patch
# User John Donoghue <john.donoghue@ieee.org>
# Date 1378510933 14400
# Node ID 2b4ed68be0d5f082babd2817f7280b2ea0b62b9f
# Parent  6dbc866379e22072111a90063d5f477705a46e45
Allow shared libs for LLVM (Bug #38654)

configure.ac: when detecting llvm, check for the LLVM-{lvmversion} library and if not found use the llvm-config --libs output.

diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -746,6 +746,7 @@
 
     save_CPPFLAGS="$CPPFLAGS"
     save_CXXFLAGS="$CXXFLAGS"
+    save_LDFLAGS="$LDFLAGS"
 
     ## Use -isystem if available because we don't want to see warnings in LLVM
     LLVM_INCLUDE_FLAG=-I
@@ -757,7 +758,11 @@
     LLVM_CPPFLAGS="$LLVM_INCLUDE_FLAG `$LLVM_CONFIG --includedir`"
     LLVM_CXXFLAGS=
     LLVM_LDFLAGS="-L`$LLVM_CONFIG --libdir`"
-    LLVM_LIBS=`$LLVM_CONFIG --libs`
+
+
+    LDFLAGS="$LDFLAGS $LLVM_LDFLAGS"
+    LLVM_SO=LLVM-`$LLVM_CONFIG --version`
+    AC_CHECK_LIB([$LLVM_SO], [LLVMBuildAdd], [LLVM_LIBS="-l$LLVM_SO"], [LLVM_LIBS=`$LLVM_CONFIG --libs`])
 
     dnl
     dnl Define some extra flags that LLVM requires in order to include headers.
@@ -796,6 +801,7 @@
     AC_LANG_POP(C++)
     CPPFLAGS="$save_CPPFLAGS"
     CXXFLAGS="$save_CXXFLAGS"
+    LDFLAGS="$save_LDFLAGS"
   fi
 
   if test -z "$warn_llvm"; then