Fix build without llvm support (#2)

* Fixes to build taco without LLVM support

* Add ENABLE_TESTS cmake command

CMakeLists.txt

@@ -3,7 +3,8 @@ project(taco)
 option(CUDA "Build for NVIDIA GPU (CUDA must be preinstalled)" OFF)
 option(PYTHON "Build TACO for python environment" OFF)
 option(OPENMP "Build with OpenMP execution support" OFF)
-option(LLVM "Build with LLVM backend support")
+option(LLVM "Build with LLVM backend support" OFF)
+option(ENABLE_TESTS "Enable tests" ON)
 
 
 if(CUDA)
@@ -30,6 +31,7 @@ if (LLVM)
   llvm_map_components_to_libnames(llvm_libs support core irreader)
   add_definitions(-DUSE_LLVM)
   add_definitions(-DENABLE_TOSTRING_LLVM)
+  add_definitions(-DHAVE_LLVM)
 endif(LLVM)
 
 SET(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")
@@ -101,15 +103,19 @@ set(TACO_TEST_DIR    ${TACO_PROJECT_DIR}/test)
 set(TACO_TOOLS_DIR   ${TACO_PROJECT_DIR}/tools)
 set(TACO_INCLUDE_DIR "${TACO_INCLUDE_DIR};${TACO_PROJECT_DIR}/include")
 
-enable_testing()
 include_directories(${TACO_INCLUDE_DIR})
 
 set(TACO_LIBRARY_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
 
 install(DIRECTORY ${TACO_INCLUDE_DIR}/ DESTINATION include)
 
 add_subdirectory(src)
-add_subdirectory(test)
+
+if (${ENABLE_TESTS})
+  enable_testing()
+  add_subdirectory(test)
+endif()
+
 add_subdirectory(tools)
 add_subdirectory(apps)
 string(REPLACE " -Wmissing-declarations" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")

src/codegen/codegen.cpp

@@ -3,7 +3,11 @@
 #include "taco/llvm.h"
 #include "codegen_cuda.h"
 #include "codegen_c.h"
+
+#ifdef HAVE_LLVM
 #include "codegen_llvm.h"
+#endif
+
 #include <algorithm>
 #include <unordered_set>
 
@@ -28,9 +32,11 @@ shared_ptr<CodeGen> CodeGen::init_default(std::ostream &dest, OutputKind outputK
   if (should_use_CUDA_codegen()) {
     return make_shared<CodeGen_CUDA>(dest, outputKind);
   }
-  if (should_use_LLVM_codegen()){
+  #ifdef HAVE_LLVM
+  else if (should_use_LLVM_codegen()){
     return make_shared<CodeGen_LLVM>(dest, outputKind);
   }
+  #endif
   else {
     return make_shared<CodeGen_C>(dest, outputKind);
   }

src/codegen/codegen_llvm.cpp

@@ -1,3 +1,4 @@
+#ifdef HAVE_LLVM
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Verifier.h"
 
@@ -673,4 +674,5 @@ void CodeGen_LLVM::visit(const GetProperty *op) {
 }
 
 } // namespace ir
-} // namespace taco
+} // namespace taco
+#endif // HAVE_LLVM

src/codegen/codegen_llvm.h

@@ -1,3 +1,4 @@
+#ifdef HAVE_LLVM
 #ifndef TACO_BACKEND_LLVM_H
 #define TACO_BACKEND_LLVM_H
 
@@ -137,4 +138,5 @@ namespace taco
   } // namespace ir
 } // namespace taco
 
-#endif
+#endif  // TACO_BACKEND_LLVM_H
+#endif  // HAVE_LLVM

src/codegen/module.cpp

@@ -14,9 +14,12 @@
 #include "taco/util/env.h"
 #include "codegen/codegen_c.h"
 #include "codegen/codegen_cuda.h"
-#include "codegen/codegen_llvm.h"
 #include "taco/cuda.h"
 
+#ifdef HAVE_LLVM
+#include "codegen/codegen_llvm.h"
+#endif
+
 using namespace std;
 
 namespace taco {

src/llvm.cpp

@@ -4,7 +4,7 @@ namespace taco{
 
 static bool LLVM_codegen_enabled = USE_LLVM;
 bool should_use_LLVM_codegen(){
-    return LLVM_codegen_enabled;
+  return LLVM_codegen_enabled;
 }
 
 void set_LLVM_codegen_enabled(bool enabled) {

tools/taco.cpp

@@ -19,7 +19,6 @@
 #include "taco/codegen/module.h"
 #include "codegen/codegen_c.h"
 #include "codegen/codegen_cuda.h"
-#include "codegen/codegen_llvm.h"
 #include "codegen/codegen.h"
 #include "taco/util/strings.h"
 #include "taco/util/files.h"
@@ -29,11 +28,14 @@
 #include "taco/util/collections.h"
 #include "taco/cuda.h"
 #include "taco/llvm.h"
-#include "taco/llvm.h"
 #include "taco/index_notation/transformations.h"
 #include "taco/index_notation/index_notation_visitor.h"
 #include "taco/index_notation/index_notation_nodes.h"
 
+#ifdef HAVE_LLVM
+#include "codegen/codegen_llvm.h"
+#endif
+
 using namespace std;
 using namespace taco;
 
@@ -966,8 +968,7 @@ int main(int argc, char* argv[]) {
     }
     set_LLVM_codegen_enabled(true);
   }
-  else
-  {
+  else {
     set_LLVM_codegen_enabled(false);
   }