Fix LLVM 5.0 build (#2173)

* Fix LLVM 5.0 compilation.

* Fix adding linker option metadata to LLVM module.

See https://reviews.llvm.org/D31349

* Version the SPIRV cache dir on travis.

.travis.yml

@@ -23,7 +23,7 @@ matrix:
       env: LLVM_VERSION=3.5.2 OPTS="-DTEST_COVERAGE=ON"
     - os: osx
       d: ldc-beta
-      env: LLVM_VERSION=5.0.0 OPTS="-DBUILD_SHARED_LIBS=OFF" LLVM_SPIRV_AVAILABLE=ON
+      env: LLVM_VERSION=5.0.0-1 OPTS="-DBUILD_SHARED_LIBS=OFF" LLVM_SPIRV_AVAILABLE=ON
     - os: osx
       d: ldc
       env: LLVM_VERSION=4.0.0 OPTS="-DBUILD_SHARED_LIBS=ON"
@@ -32,7 +32,7 @@ matrix:
 
 cache:
   directories:
-    - llvm-spirv-5.0.0
+    - llvm-spirv-5.0.0-1
     - llvm-4.0.1
     - llvm-4.0.0
     - llvm-3.9.1

driver/codegenerator.cpp

@@ -73,7 +73,8 @@ createAndSetDiagnosticsOutputFile(IRState &irs, llvm::LLVMContext &ctx,
 
 namespace {
 
-/// Add the linker options metadata flag.
+#if LDC_LLVM_VER < 500
+/// Add the Linker Options module flag.
 /// If the flag is already present, merge it with the new data.
 void emitLinkerOptions(IRState &irs, llvm::Module &M, llvm::LLVMContext &ctx) {
   if (!M.getModuleFlag("Linker Options")) {
@@ -119,6 +120,31 @@ void emitLinkerOptions(IRState &irs, llvm::Module &M, llvm::LLVMContext &ctx) {
 #endif
   }
 }
+#else
+/// Add the "llvm.linker.options" metadata.
+/// If the metadata is already present, merge it with the new data.
+void emitLinkerOptions(IRState &irs, llvm::Module &M, llvm::LLVMContext &ctx) {
+  auto *linkerOptionsMD = M.getOrInsertNamedMetadata("llvm.linker.options");
+
+  // Add the new operands in front of the existing ones, such that linker
+  // options of .bc files passed on the cmdline are put _after_ the compiled .d
+  // file.
+
+  // Temporarily store metadata nodes that are already present
+  llvm::SmallVector<llvm::MDNode *, 5> oldMDNodes;
+  for (auto *MD : linkerOptionsMD->operands())
+    oldMDNodes.push_back(MD);
+
+  // Clear the list and add the new metadata nodes.
+  linkerOptionsMD->clearOperands();
+  for (auto *MD : irs.LinkerMetadataArgs)
+    linkerOptionsMD->addOperand(MD);
+
+  // Re-add metadata nodes that were already present
+  for (auto *MD : oldMDNodes)
+    linkerOptionsMD->addOperand(MD);
+}
+#endif
 
 void emitLLVMUsedArray(IRState &irs) {
   if (irs.usedArray.empty()) {

driver/main.cpp

@@ -118,33 +118,45 @@ static inline llvm::Optional<llvm::Reloc::Model> getRelocModel() {
 static inline llvm::Reloc::Model getRelocModel() { return mRelocModel; }
 #endif
 
-void printVersion() {
-  printf("LDC - the LLVM D compiler (%s):\n", global.ldc_version);
-  printf("  based on DMD %s and LLVM %s\n", global.version,
-         global.llvm_version);
-  printf("  built with %s\n", ldc::built_with_Dcompiler_version);
+// This function exits the program.
+void printVersion(llvm::raw_ostream &OS) {
+  OS << "LDC - the LLVM D compiler (" << global.ldc_version << "):\n";
+  OS << "  based on DMD " << global.version << " and LLVM " << global.llvm_version << "\n";
+  OS << "  built with " << ldc::built_with_Dcompiler_version << "\n";
 #if defined(__has_feature)
 #if __has_feature(address_sanitizer)
-  printf("  compiled with address sanitizer enabled\n");
+  OS << "  compiled with address sanitizer enabled\n";
 #endif
 #endif
-  printf("  Default target: %s\n", llvm::sys::getDefaultTargetTriple().c_str());
+  OS << "  Default target: " << llvm::sys::getDefaultTargetTriple() << "\n";
   std::string CPU = llvm::sys::getHostCPUName();
   if (CPU == "generic") {
     CPU = "(unknown)";
   }
-  printf("  Host CPU: %s\n", CPU.c_str());
-  printf("  http://dlang.org - http://wiki.dlang.org/LDC\n");
-  printf("\n");
+  OS << "  Host CPU: " << CPU << "\n";
+  OS << "  http://dlang.org - http://wiki.dlang.org/LDC\n";
+  OS << "\n";
 
   // Without explicitly flushing here, only the target list is visible when
   // redirecting stdout to a file.
-  fflush(stdout);
+  OS.flush();
+
+  llvm::TargetRegistry::printRegisteredTargetsForVersion(
+#if LDC_LLVM_VER >= 500
+      OS
+#endif
+      );
 
-  llvm::TargetRegistry::printRegisteredTargetsForVersion();
   exit(EXIT_SUCCESS);
 }
 
+// This function exits the program.
+void printVersionStdout() {
+  printVersion(llvm::outs());
+  assert(false);
+}
+
+
 namespace {
 
 // Helper function to handle -d-debug=* and -d-version=*
@@ -351,7 +363,11 @@ void parseCommandLine(int argc, char **argv, Strings &sourceFiles,
   // finalize by expanding response files specified in config file
   expandResponseFiles(allocator, allArguments);
 
+#if LDC_LLVM_VER >= 500
   cl::SetVersionPrinter(&printVersion);
+#else
+  cl::SetVersionPrinter(&printVersionStdout);
+#endif
 
   opts::hideLLVMOptions();
   opts::createClashingOptions();

gen/irstate.h

@@ -200,7 +200,9 @@ struct IRState {
   llvm::StringMap<llvm::GlobalVariable *> stringLiteral4ByteCache;
 
 /// Vector of options passed to the linker as metadata in object file.
-#if LDC_LLVM_VER >= 306
+#if LDC_LLVM_VER >= 500
+  llvm::SmallVector<llvm::MDNode *, 5> LinkerMetadataArgs;
+#elif LDC_LLVM_VER >= 306
   llvm::SmallVector<llvm::Metadata *, 5> LinkerMetadataArgs;
 #else
   llvm::SmallVector<llvm::Value *, 5> LinkerMetadataArgs;

tests/linking/link_bitcode_libs.d

@@ -1,6 +1,8 @@
 // Test passing of LLVM bitcode file with Linker Options set
 
 // REQUIRES: atleast_llvm306
+// LLVM >= 5.0 uses llvm.linker.options instead. See link_bitcode_libs_500.d.
+// REQUIRES: atmost_llvm400
 
 // Linker Options are currently only set on Windows platform, so we must (cross-)compile to Windows
 // REQUIRES: target_X86

tests/linking/link_bitcode_libs_500.d

@@ -0,0 +1,19 @@
+// Test passing of LLVM bitcode file with Linker Options set
+
+// REQUIRES: atleast_llvm500
+
+// Linker Options are currently only set on Windows platform, so we must (cross-)compile to Windows
+// REQUIRES: target_X86
+
+// RUN: %ldc -mtriple=x86_64-windows -c -output-bc %S/inputs/link_bitcode_libs_input.d -of=%t.bc \
+// RUN:    && %ldc -mtriple=x86_64-windows -c -singleobj -output-ll %t.bc %s -of=%t.ll \
+// RUN:    && FileCheck %s < %t.ll
+
+pragma(lib, "library_one");
+pragma(lib, "library_two");
+
+// CHECK: !llvm.linker.options = !{![[ATTR_LIB1:[0-9]+]], ![[ATTR_LIB2:[0-9]+]], ![[ATTR_LIB3:[0-9]+]], ![[ATTR_LIB4:[0-9]+]]}
+// CHECK: ![[ATTR_LIB1]]{{.*}}library_one
+// CHECK: ![[ATTR_LIB2]]{{.*}}library_two
+// CHECK: ![[ATTR_LIB3]]{{.*}}imported_one
+// CHECK: ![[ATTR_LIB4]]{{.*}}imported_two