it's only in LLVM 12+ that llvm::SplitEdge() gains a 6th param BBName…

… for naming blocks. use macros to provide a version-agnostic API (which discards the BBName -- LLVM will use a default block name '%s.split' derived from one of the blocks bifurcated by the edge)

src/ast/irbuilderbpf.cpp

@@ -13,7 +13,6 @@
 
 #include <llvm/IR/DataLayout.h>
 #include <llvm/IR/Module.h>
-#include <llvm/Transforms/Utils/BasicBlockUtils.h>
 
 namespace libbpf {
 #undef __BPF_FUNC_MAPPER
@@ -379,12 +378,12 @@ CallInst *IRBuilderBPF::CreateGetScratchMap(Value *ctx,
 {
   assert(post_hoist_block_ != nullptr);
   auto ip = saveIP();
-  BasicBlock *get_map = SplitEdge(post_hoist_block_->getSinglePredecessor(),
-                                  post_hoist_block_,
-                                  nullptr,
-                                  nullptr,
-                                  nullptr,
-                                  "validate_map_lookup_" + name);
+  BasicBlock *get_map = SPLIT_EDGE(post_hoist_block_->getSinglePredecessor(),
+                                   post_hoist_block_,
+                                   nullptr,
+                                   nullptr,
+                                   nullptr,
+                                   "validate_map_lookup_" + name);
   // remove the unconditional break to posthoist which SplitEdge gives us,
   // because CreateHelperErrorCond() will emit a conditional break to posthoist
   // instead

src/ast/irbuilderbpf.h

@@ -7,6 +7,7 @@
 
 #include <llvm/Config/llvm-config.h>
 #include <llvm/IR/IRBuilder.h>
+#include <llvm/Transforms/Utils/BasicBlockUtils.h>
 
 #if LLVM_VERSION_MAJOR >= 5 && LLVM_VERSION_MAJOR < 7
 #define CREATE_MEMCPY(dst, src, size, algn)                                    \
@@ -35,6 +36,19 @@
   CreateMemSet((ptr), (val), (size), (align))
 #endif
 
+#if LLVM_VERSION_MAJOR >= 5 && LLVM_VERSION_MAJOR < 8
+#define SPLIT_EDGE(from, to, dt, li, mssau, bbname)                            \
+  SplitEdge((from), (to), (dt), (li))
+#elif LLVM_VERSION_MAJOR >= 8 && LLVM_VERSION_MAJOR < 12
+#define SPLIT_EDGE(from, to, dt, li, mssau, bbname)                            \
+  SplitEdge((from), (to), (dt), (li), (mssau))
+#elif LLVM_VERSION_MAJOR >= 12
+#define SPLIT_EDGE(from, to, dt, li, mssau, bbname)                            \
+  SplitEdge((from), (to), (dt), (li), (mssau), (bbname))
+#else
+#error Unsupported LLVM version
+#endif
+
 namespace bpftrace {
 namespace ast {