Merge pull request #35934 from JuliaLang/jn/35934

minor compiler utility additions [NFC]

Author: vtjnash

src/Makefile

@@ -21,7 +21,7 @@ FLAGS := \
 	-I$(JULIAHOME)/deps/valgrind
 ifneq ($(USEMSVC), 1)
 FLAGS += -Wall -Wno-strict-aliasing -fno-omit-frame-pointer -fvisibility=hidden -fno-common \
-		 -Wpointer-arith -Wundef
+		 -Wno-comment -Wpointer-arith -Wundef
 ifeq ($(USEGCC),1) # GCC bug #25509 (void)__attribute__((warn_unused_result))
 FLAGS += -Wno-unused-result
 endif

src/codegen.cpp

@@ -7583,6 +7583,22 @@ extern "C" void jl_dump_llvm_debugloc(void *v)
     llvm_dump((DebugLoc*)v);
 }
 
+namespace llvm {
+    class MachineBasicBlock;
+    class MachineFunction;
+    raw_ostream& operator<<(raw_ostream &OS, const MachineBasicBlock &MBB);
+    void printMIR(raw_ostream &OS, const MachineFunction &MF);
+}
+extern "C" void jl_dump_llvm_mbb(void *v)
+{
+    errs() << *(llvm::MachineBasicBlock*)v;
+}
+extern "C" void jl_dump_llvm_mfunction(void *v)
+{
+    llvm::printMIR(errs(), *(llvm::MachineFunction*)v);
+}
+
+
 extern void jl_write_bitcode_func(void *F, char *fname) {
     std::error_code EC;
     raw_fd_ostream OS(fname, EC, sys::fs::F_None);

src/llvm-version.h

@@ -17,3 +17,8 @@
 #endif
 
 #define LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING 0
+
+#if defined(__GNUC__) && (__GNUC__ >= 9)
+// Added in GCC 9, this warning is annoying
+#pragma GCC diagnostic ignored "-Winit-list-lifetime"
+#endif