fix build with 4.0 llvm trunk

Signed-off-by: Alexei Starovoitov <ast@fb.com>

src/cc/CMakeLists.txt

@@ -44,7 +44,7 @@ add_library(bcc-static STATIC bpf_common.cc bpf_module.cc shared_table.cc export
 set_target_properties(bcc-static PROPERTIES OUTPUT_NAME bcc)
 
 set(llvm_raw_libs bitwriter bpfcodegen irreader linker
-  mcjit objcarcopts option passes nativecodegen)
+  mcjit objcarcopts option passes nativecodegen lto)
 list(FIND LLVM_AVAILABLE_LIBS "LLVMCoverage" _llvm_coverage)
 if (${_llvm_coverage} GREATER -1)
   list(APPEND llvm_raw_libs coverage)

src/cc/bpf_module.cc

@@ -42,6 +42,7 @@
 #include <llvm/Support/TargetSelect.h>
 #include <llvm/Transforms/IPO.h>
 #include <llvm/Transforms/IPO/PassManagerBuilder.h>
+#include <llvm-c/Transforms/IPO.h>
 
 #include "exception.h"
 #include "frontends/b/loader.h"
@@ -396,7 +397,14 @@ int BPFModule::run_pass_manager(Module &mod) {
   PassManagerBuilder PMB;
   PMB.OptLevel = 3;
   PM.add(createFunctionInliningPass());
-  PM.add(createAlwaysInlinerPass());
+  /*
+   * llvm < 4.0 needs
+   * PM.add(createAlwaysInlinerPass());
+   * llvm >= 4.0 needs
+   * PM.add(createAlwaysInlinerLegacyPass());
+   * use below 'stable' workaround
+   */
+  LLVMAddAlwaysInlinerPass(reinterpret_cast<LLVMPassManagerRef>(&PM));
   PMB.populateModulePassManager(PM);
   if (flags_ & 1)
     PM.add(createPrintModulePass(outs()));