diff --git a/ci.hocon b/ci.hocon
index f274b102ffab633d0266a478af40497b0283a00e..4c97461fc140d1de63becdf5323cd0dcb8e08801 100644
--- a/ci.hocon
+++ b/ci.hocon
@@ -146,7 +146,7 @@ gateTestLinuxLLVM : ${common} ${requireGCC} {
environment : {
TZDIR: "/usr/share/zoneinfo"
FASTR_RFFI : "llvm"
- FASTR_LLVM_HOME : "$DRAGONEGG_LLVM/bin"
+ FASTR_LLVM_TOOLS : "$DRAGONEGG_LLVM/bin"
FASTR_LLVM_GFORTRAN_LLVM_AS : "$DRAGONEGG_LLVM/bin/llvm-as"
FASTR_LLVM_GFORTRAN : "$DRAGONEGG_GCC/bin/gfortran"
FASTR_LLVM_DRAGONEGG : "$DRAGONEGG_GCC/lib/dragonegg.so"
@@ -192,7 +192,7 @@ gateTestDarwinLLVM: ${common} ${darwinEnvironment} ${requireGCC} {
environment : {
FASTR_RFFI : "llvm"
- FASTR_LLVM_HOME : "$DRAGONEGG_LLVM/bin"
+ FASTR_LLVM_TOOLS : "$DRAGONEGG_LLVM/bin"
FASTR_LLVM_GFORTRAN_LLVM_AS : "$DRAGONEGG_LLVM/bin/llvm-as"
FASTR_LLVM_GFORTRAN : "$DRAGONEGG_GCC/bin/gfortran"
FASTR_LLVM_DRAGONEGG : "$DRAGONEGG_GCC/lib/dragonegg.so"
diff --git a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java
index b219056de01d517ed77b33cb88872150d40ad8b1..3f524ddfaa00cb6378e28c51cd28b8cc372c246a 100644
--- a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java
+++ b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java
@@ -906,9 +906,9 @@ public abstract class JavaUpCallsRFFIImpl implements UpCallsRFFI {
}
/**
- * Helper function for {@code R_TopLevelExec} which is similar to {@code R_TryEval} except that
- * a C function is invoked (in the native layer) instead of an R expression. assert: this is
- * ONLY called from R_TopLevelExec prior to calling C function.
+ * Helper function for {@code R_TopLevelExec} which is similar to {@code R_TryEval} except that a C
+ * function is invoked (in the native layer) instead of an R expression. assert: this is ONLY called
+ * from R_TopLevelExec prior to calling C function.
*/
@Override
@TruffleBoundary
@@ -1966,8 +1966,12 @@ public abstract class JavaUpCallsRFFIImpl implements UpCallsRFFI {
@Override
public Object INTEGER(Object x) {
// also handles LOGICAL
- assert x instanceof RIntVector || x instanceof RLogicalVector || x == RNull.instance;
- return VectorWrapper.get(guaranteeVectorOrNull(x, RVector.class));
+ assert x instanceof RIntVector || x instanceof RLogicalVector || x == RNull.instance || x instanceof RUnboundValue : "" + x + ":" + x.getClass();
+ if (x instanceof RUnboundValue) {
+ return VectorWrapper.get((RUnboundValue) x);
+ } else {
+ return VectorWrapper.get(guaranteeVectorOrNull(x, RVector.class));
+ }
}
@Override
diff --git a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/interop/package-info.java b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/interop/package-info.java
index 19ebc60087b43aa9e717c0a82e3ff6f7027e67be..41e4198d9ef720c68d5c497b6d8664eb0fad1dd7 100644
--- a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/interop/package-info.java
+++ b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/interop/package-info.java
@@ -24,9 +24,8 @@
* A collection of types and {@link com.oracle.truffle.api.interop.MessageResolution} classes that
* support the implementations.
*
- * See {@link com.oracle.truffle.r.ffi.impl.interop.base} and
- * {@link com.oracle.truffle.r.ffi.impl.interop.pcre} for similar classes specific to the
- * {@link com.oracle.truffle.r.runtime.ffi.BaseRFFI} and
+ * See com.oracle.truffle.r.ffi.impl.interop.base and com.oracle.truffle.r.ffi.impl.interop.pcre for
+ * similar classes specific to the {@link com.oracle.truffle.r.runtime.ffi.BaseRFFI} and
* {@link com.oracle.truffle.r.runtime.ffi.PCRERFFI} interfaces.
*/
package com.oracle.truffle.r.ffi.impl.interop;
diff --git a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Context.java b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Context.java
index c48bb4886ac118825e99dd3017349142a521d17d..87b27410abff7d047bf27118a6a733e1f38727dd 100644
--- a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Context.java
+++ b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Context.java
@@ -88,7 +88,7 @@ final class TruffleLLVM_Context extends RFFIContext {
TruffleLLVM_NativeDLL.NativeDLOpenRootNode.create().getCallTarget().call(libzPath, false, true);
// String curlPath = LibPaths.getBuiltinLibPath("curl.4");
- String curlPath = "libcurl.dylib";
+ String curlPath = "libcurl.so";
TruffleLLVM_NativeDLL.NativeDLOpenRootNode.create().getCallTarget().call(curlPath, false, true);
}
diff --git a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_DLL.java b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_DLL.java
index 568b273a72b0de402d520a02798a4940a67f643b..a1ba42a71381bb0441198c4b94366fab04470b62 100644
--- a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_DLL.java
+++ b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_DLL.java
@@ -65,10 +65,10 @@ import com.oracle.truffle.r.runtime.ffi.DLLRFFI;
public class TruffleLLVM_DLL implements DLLRFFI {
static class ContextStateImpl implements RContext.ContextState {
/**
- * When a new {@link RContext} is created we have to re-parse the libR modules,
- * unfortunately, as there is no way to propagate the LLVM state created in the initial
- * context. TODO when do we really need to do this? This is certainly too early for contexts
- * that will not invoke LLVM code (e.g. most unit tests)
+ * When a new {@link RContext} is created we have to re-parse the libR modules, unfortunately, as
+ * there is no way to propagate the LLVM state created in the initial context. TODO when do we
+ * really need to do this? This is certainly too early for contexts that will not invoke LLVM code
+ * (e.g. most unit tests)
*/
@Override
public ContextState initialize(RContext context) {
@@ -167,10 +167,9 @@ public class TruffleLLVM_DLL implements DLLRFFI {
@Child private TruffleLLVM_NativeDLL.TruffleLLVM_NativeDLOpen nativeDLLOpenNode;
/**
- * If a library is enabled for LLVM, the IR for all the modules is retrieved and analyzed.
- * Every exported symbol in the module added to the parseStatus map for the current
- * {@link RContext}. This allows {@code dlsym} to definitively locate any symbol, even if
- * the IR has not been parsed yet.
+ * If a library is enabled for LLVM, the IR for all the modules is retrieved and analyzed. Every
+ * exported symbol in the module added to the parseStatus map for the current {@link RContext}. This
+ * allows {@code dlsym} to definitively locate any symbol, even if the IR has not been parsed yet.
*/
@Override
public Object execute(String path, boolean local, boolean now) {
@@ -199,6 +198,7 @@ public class TruffleLLVM_DLL implements DLLRFFI {
sb.append(t.getMessage());
t = t.getCause();
}
+ ex.printStackTrace();
throw new UnsatisfiedLinkError(sb.toString());
}
}
diff --git a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_UpCallsRFFIImpl.java b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_UpCallsRFFIImpl.java
index d6a1f4b67f5d8153fc01a3d1bf6abb775ef4b247..ad6eed382d4b3c7322dc5fbefc3d4fddc11ec70c 100644
--- a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_UpCallsRFFIImpl.java
+++ b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_UpCallsRFFIImpl.java
@@ -40,6 +40,7 @@ import com.oracle.truffle.r.runtime.data.RDouble;
import com.oracle.truffle.r.runtime.data.RInteger;
import com.oracle.truffle.r.runtime.data.RLogical;
import com.oracle.truffle.r.runtime.data.RScalar;
+import com.oracle.truffle.r.runtime.data.RString;
import com.oracle.truffle.r.runtime.data.RTypedValue;
import com.oracle.truffle.r.runtime.ffi.DLL;
import com.oracle.truffle.r.runtime.ffi.DLL.CEntry;
@@ -108,6 +109,8 @@ public class TruffleLLVM_UpCallsRFFIImpl extends JavaUpCallsRFFIImpl {
return RInteger.valueOf((int) x);
} else if (x instanceof Byte) {
return RLogical.valueOf((byte) x);
+ } else if (x instanceof String) {
+ return RString.valueOf((String) x);
} else {
throw RInternalError.shouldNotReachHere();
}
diff --git a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/upcalls/FFIWrapNode.java b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/upcalls/FFIWrapNode.java
index 115713fabac830b3415f1a145e1abde714fb6d5a..e6d51dbe8cf31523fe99b9882a4e1a984b8691ac 100644
--- a/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/upcalls/FFIWrapNode.java
+++ b/com.oracle.truffle.r.ffi.impl/src/com/oracle/truffle/r/ffi/impl/upcalls/FFIWrapNode.java
@@ -38,6 +38,7 @@ import com.oracle.truffle.r.runtime.data.RRaw;
import com.oracle.truffle.r.runtime.data.RScalarList;
import com.oracle.truffle.r.runtime.data.RScalarVector;
import com.oracle.truffle.r.runtime.data.RSequence;
+import com.oracle.truffle.r.runtime.data.RString;
public abstract class FFIWrapNode extends Node {
@@ -63,6 +64,11 @@ public abstract class FFIWrapNode extends Node {
return wrap(RDataFactory.createStringVectorFromScalar(value));
}
+ @Specialization
+ protected static Object wrap(RString value) {
+ return wrap(RDataFactory.createStringVectorFromScalar(value.getValue()));
+ }
+
@Specialization
protected static Object wrap(RInteger value) {
return wrap(RDataFactory.createIntVectorFromScalar(value.getValue()));
diff --git a/com.oracle.truffle.r.native/fficall/Makefile b/com.oracle.truffle.r.native/fficall/Makefile
index f6176fd2d0aa5d3f78ee729487b1dfa2c7a38ecf..e22efe39d81235211df630677b8d9cae7424ded4 100644
--- a/com.oracle.truffle.r.native/fficall/Makefile
+++ b/com.oracle.truffle.r.native/fficall/Makefile
@@ -57,7 +57,7 @@ ifeq ($(FASTR_RFFI),managed)
else
ifeq ($(OS_NAME),Darwin)
$(DYLIB_LD) $(DYLIB_LDFLAGS) -Wl,-rpath,@loader_path/ -o $(R_LIB) $(wildcard lib/*.o) -L$(FASTR_LIB_DIR) -ldl -lRblas -lRlapack -lpcre -lz $(VERSION_FLAGS)
-ifneq ($(FASTR_RFFI),llvm)
+ifneq ($(FASTR_RFFI),llvm)
install_name_tool -change libRblas.dylib @rpath/libRblas.dylib $(R_LIB)
install_name_tool -change libRlapack.dylib @rpath/libRlapack.dylib $(R_LIB)
install_name_tool -id @rpath/libR.dylib $(R_LIB)
@@ -80,6 +80,12 @@ fficall.done: common.done
else
ifeq ($(FASTR_RFFI),llvm)
+ifndef FASTR_LLVM_TOOLS
+ifdef FASTR_LLVM_FOR_DRAGONEGG_HOME
+export FASTR_LLVM_TOOLS = $(FASTR_LLVM_FOR_DRAGONEGG_HOME)/bin
+$(info FASTR_LLVM_TOOLS set to $(FASTR_LLVM_TOOLS))
+endif
+endif
fficall.done: common.done
$(MAKE) -C src/truffle_llvm all
touch fficall.done
@@ -90,7 +96,7 @@ endif #nfi
endif #managed
common.done:
- $(MAKE) -C src/common all
+ $(MAKE) -C src/common all
touch common.done
clean:
@@ -109,4 +115,3 @@ endif
rm -rf $(R_LIB)
rm -rf fficall.done
rm -rf common.done
-
diff --git a/com.oracle.truffle.r.native/llvm_tools/llvm-c++ b/com.oracle.truffle.r.native/llvm_tools/llvm-c++
index 54c0ef43ed8c4701d9eaf01ee64bbbf3f95fb47c..a20027b69b0706e7e8ea764dca9271f8442f786d 100755
--- a/com.oracle.truffle.r.native/llvm_tools/llvm-c++
+++ b/com.oracle.truffle.r.native/llvm_tools/llvm-c++
@@ -38,12 +38,13 @@ then
create_bc_lib $@ $extraObj
else
llvm_tool=clang++
- #get_llvm_tool
- #runit $llvm_tool_bin $llvm_args
- echo "Clang args: $llvm_args"
- clang --version
- clang $llvm_args
-
+ get_llvm_tool
+ unamestr=`uname`
+ if [[ "$unamestr" == 'Linux' ]]; then
+ llvm_args="-stdlib=libc++ -I/usr/include/libcxxabi $llvm_args"
+ fi
+ runit $llvm_tool_bin $llvm_args
+
# the llvm_ir_file is empty if the result is sent to stdout
if [ -n "$llvm_ir_file" ]; then
mem2reg_opt
diff --git a/com.oracle.truffle.r.native/llvm_tools/llvm-cc b/com.oracle.truffle.r.native/llvm_tools/llvm-cc
index 38f1d992b0933632ddd94fe6ca86c4bebf2d3793..1ab1691aaa7a61d610b9dafb4d52df6e7878bb27 100755
--- a/com.oracle.truffle.r.native/llvm_tools/llvm-cc
+++ b/com.oracle.truffle.r.native/llvm_tools/llvm-cc
@@ -37,10 +37,9 @@ then
fi
create_bc_lib $@ $extraObj
else
- #llvm_tool=clang
- #get_llvm_tool
- #runit $llvm_tool_bin $llvm_args
- runit clang $llvm_args
+ llvm_tool=clang
+ get_llvm_tool
+ runit $llvm_tool_bin $llvm_args
# the llvm_ir_file is empty if the result is sent to stdout
if [ -n "$llvm_ir_file" ]; then
mem2reg_opt
diff --git a/com.oracle.truffle.r.native/llvm_tools/llvm-helper b/com.oracle.truffle.r.native/llvm_tools/llvm-helper
index 102283405c134948efaed29826cca35f680b82e3..88d41309ff27faa09043129217f78819e6363615 100644
--- a/com.oracle.truffle.r.native/llvm_tools/llvm-helper
+++ b/com.oracle.truffle.r.native/llvm_tools/llvm-helper
@@ -62,7 +62,7 @@ function analyze_args() {
is_link=0
llvm_ir_file=""
-
+
while [[ $# -gt 0 ]]
do
llvm_args+="$1 "
@@ -96,9 +96,9 @@ function analyze_args() {
# path to tool (defaults to plain ${llvm_tool}, assumed to be on the PATH)
function get_llvm_tool() {
- if [ -n "${FASTR_LLVM_HOME}" ]
+ if [ -n "${FASTR_LLVM_TOOLS}" ]
then
- llvm_tool_bin=${FASTR_LLVM_HOME}/${llvm_tool}
+ llvm_tool_bin=${FASTR_LLVM_TOOLS}/${llvm_tool}
else
llvm_tool_uc=`echo ${llvm_tool} | tr /a-z/ /A-Z/ | tr /+/ /P/`
x=FASTR_LLVM_${llvm_tool_uc}
@@ -111,12 +111,10 @@ function get_llvm_tool() {
fi
}
-
function mem2reg_opt() {
- #llvm_tool="opt"
- #get_llvm_tool
- #runit ${llvm_tool_bin} -mem2reg $llvm_ir_file -o ${llvm_ir_file}.opt
- runit opt -mem2reg $llvm_ir_file -o ${llvm_ir_file}.opt
+ llvm_tool="opt"
+ get_llvm_tool
+ runit ${llvm_tool_bin} -mem2reg $llvm_ir_file -o ${llvm_ir_file}.opt
rc=$?
if [ $rc -eq 0 ]
then
@@ -127,7 +125,7 @@ function mem2reg_opt() {
function fake_obj() {
f=`basename $llvm_ir_file`
d=`dirname $llvm_ir_file`
- runit touch ${d}/${f%%.*}.o
+ runit touch ${d}/${f%%.*}.o
}
# Input: all the arguments to the original command line
@@ -161,20 +159,18 @@ function create_bc_lib() {
# it will be the pathname, which we will reduce to a module name on input in FastR
# link the bitcode files into a single one using llvm-link before zipping it
- #llvm_tool=llvm-link
- #get_llvm_tool
- #runit $llvm_tool_bin $bcfiles -o $lib.bc
- echo "Linking $lib.bc with $bcfiles"
- runit llvm-link $bcfiles -o $lib.bc
+ llvm_tool=llvm-link
+ get_llvm_tool
+ runit $llvm_tool_bin $bcfiles -o $lib.bc
runit zip -r $lib $lib.bc
rm $lib.bc
}
-# It appends objects constituting a static library to the list of extra object files.
+# It appends objects constituting a static library to the list of extra object files.
# This list is maintained in $R_PACKAGE_DIR/libobjects and is later read in llvm-cc and
-# llvm-c++ to append the object files from the list to other objects when making
-# the package dynamic library. This mechanism is a workaround for the fact that the llvm
-# linker does not support linking to static libraries, as the standard linker does
+# llvm-c++ to append the object files from the list to other objects when making
+# the package dynamic library. This mechanism is a workaround for the fact that the llvm
+# linker does not support linking to static libraries, as the standard linker does
# through the -l and -L options.
function create_bc_archive() {
@@ -187,12 +183,12 @@ function create_bc_archive() {
archname=$1
arargs="rcs $archname "
shift
-
+
archObjCSVtmp="archived_objects.tmp"
archObjCSV="archived_objects.csv"
exportedObjCSV="exported_objects.csv"
> $archObjCSV
-
+
while [[ $# -gt 0 ]]
do
case $1 in
@@ -215,10 +211,10 @@ function create_bc_archive() {
sort -d --field-separator=' ' --key=1 $archObjCSVtmp > $archObjCSV
- # Create the archive (via llvm-ar) that is then used to read the symbol table via llvm-nm.
+ # Create the archive (via llvm-ar) that is then used to read the symbol table via llvm-nm.
# The symbol table allows for selecting a set of objects exporting unique symbols.
llvm-ar $arargs
-
+
# This command extracts a set of objects from the archive that do not export duplicate symbols
llvm-nm -print-file-name $archname | grep "\-\-\-\-" | awk -F ' ' '{print $1" "$4}' | sort -d --field-separator=' ' --key=2 -u | awk -F ':' '{print $2}' | sort -d -u > $exportedObjCSV
diff --git a/com.oracle.truffle.r.native/run/edMakeconf.etc.llvm b/com.oracle.truffle.r.native/run/edMakeconf.etc.llvm
index d9a5864d77d6d0115a2d5ab58a250f6e39a18487..c4972785f1b97ace17efcf41e7d9d36f203e2910 100644
--- a/com.oracle.truffle.r.native/run/edMakeconf.etc.llvm
+++ b/com.oracle.truffle.r.native/run/edMakeconf.etc.llvm
@@ -8,6 +8,11 @@ d
i
CXX = $(R_HOME)/bin/llvm-c++
.
+/^CXX11 =/
+d
+i
+CXX11 = $(R_HOME)/bin/llvm-c++
+.
/^FC =/
d
i
diff --git a/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/data/RPairList.java b/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/data/RPairList.java
index e3be9c96ea3e37a40fd7df240ff2bfbe95fa3640..86be2ec8d8dc4bbef684c3233c4357079a9180d3 100644
--- a/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/data/RPairList.java
+++ b/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/data/RPairList.java
@@ -48,8 +48,8 @@ public final class RPairList extends RSharingAttributeStorage implements RAbstra
private Object car = RNull.instance;
private Object cdr = RNull.instance;
/**
- * Externally, i.e., when serialized, this is either a SYMSXP ({@link RSymbol}) or an
- * {@link RNull}. Internally it may take on other, non-null, values.
+ * Externally, i.e., when serialized, this is either a SYMSXP ({@link RSymbol}) or an {@link RNull}.
+ * Internally it may take on other, non-null, values.
*/
private Object tag = RNull.instance;
@@ -390,6 +390,9 @@ public final class RPairList extends RSharingAttributeStorage implements RAbstra
@Override
public RPairList next() {
+ if (plt instanceof RLanguage) {
+ plt = ((RLanguage) plt).getPairList();
+ }
assert plt instanceof RPairList;
RPairList curr = (RPairList) plt;
plt = curr.cdr;
diff --git a/documentation/dev/truffle_llvm_ffi.md b/documentation/dev/truffle_llvm_ffi.md
index c0cbb908c0ec77477037ff3386533ea9fb05fa80..bff8c9114a7b862b5262873317c8832898a08391 100644
--- a/documentation/dev/truffle_llvm_ffi.md
+++ b/documentation/dev/truffle_llvm_ffi.md
@@ -65,7 +65,7 @@ FastR necessarily provides very fine control over the versions of the llvm tools
The tools needed to build FastR and to install packages containing native code are `clang`, `clang++` and `opt`. Precisely which versions of these tools are used can be controlled in two ways.
-1. Set `FASTR_LLVM_HOME` to a directory containing the tools, named as above. N.B. Since MacPorts uses names of the form `clang-mp-3.8` this requires using symbolic links. E.g. create a directory called, say, `llvm-3.8` and symlink to the MacPorts binary, e.g., `clang-mp-3.8` and name it as `clang`. Then set `FASTR_LLVM_HOME` to that directory.
+1. Set `FASTR_LLVM_TOOLS` to a directory containing the tools, named as above. N.B. Since MacPorts uses names of the form `clang-mp-3.8` this requires using symbolic links. E.g. create a directory called, say, `llvm-3.8` and symlink to the MacPorts binary, e.g., `clang-mp-3.8` and name it as `clang`. Then set `FASTR_LLVM_TOOLS` to that directory.
2. Set `FASTR_LLVM_CLANG`, `FASTR_LLVM_CLANGPP` and `FASTR_LLVM_OPT` to the actual binary images, e.g., `export FASTR_LLVM_CLANG=/opt/local/bin/clang-mp-3.8`.
Not all versions of the llvm tools can compile FastR. `clang-3.2` that is downloaded as part of the DragonEgg build is known to work. This currently is placed in `sulong/cache/tools/llvm/bin` by the DragonEgg build and, again, can be copied to a shared location. `clang-3.8` and `clang-4.0` are known not to work, but `clang-3.9` does.