Clover needs the irreader component of llvm

v2: Check for irreader component
irreader is only available with LLVM 3.3 >= 177971

Signed-off-by: Niels Ole Salscheider <[email protected]>
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 81d4a3f..fea5868 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1650,6 +1650,10 @@ if test "x$enable_gallium_llvm" = xyes; then
 
         if test "x$enable_opencl" = xyes; then
             LLVM_COMPONENTS="${LLVM_COMPONENTS} ipo linker instrumentation"
+            # LLVM 3.3 >= 177971 requires IRReader
+            if $LLVM_CONFIG --components | grep -q '\<irreader\>'; then
+                LLVM_COMPONENTS="${LLVM_COMPONENTS} irreader"
+            fi
         fi
        LLVM_LDFLAGS=`$LLVM_CONFIG --ldflags`
        LLVM_BINDIR=`$LLVM_CONFIG --bindir`
-- 
1.8.2

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