[llvm-jitlink] Don't add process symbols to every JITDylib.

The addProcessSymbols function added a generator for process symbols to every
JITDylib in the session, but this is unhelpful default behavior (e.g. it will
cause the ORC runtime's definition of __cxa_atexit to be shadowed by the
process's definition for all JITDylibs except main).

Since the loadProcessSymbols function already added a generator to main we only
need to drop this function. Other JITDylibs wishing to resolve process symbols
can link against the main JITDylib by passing `-lmain`.

diff --git a/llvm/tools/llvm-jitlink/llvm-jitlink.cpp b/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
index 3dc1767..580ebda 100644 (file)
--- a/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
+++ b/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
@@ -1718,21 +1718,6 @@ static Error addLibraries(Session &S,
   return Error::success();
 }
 
-static Error addProcessSymbols(Session &S,
-                               const std::map<unsigned, JITDylib *> &IdxToJD) {
-
-  if (NoProcessSymbols)
-    return Error::success();
-
-  for (auto &KV : IdxToJD) {
-    auto &JD = *KV.second;
-    JD.addGenerator(ExitOnErr(
-        orc::EPCDynamicLibrarySearchGenerator::GetForTargetProcess(S.ES)));
-  }
-
-  return Error::success();
-}
-
 static Error addSessionInputs(Session &S) {
   std::map<unsigned, JITDylib *> IdxToJD;
 
@@ -1755,9 +1740,6 @@ static Error addSessionInputs(Session &S) {
   if (auto Err = addLibraries(S, IdxToJD))
     return Err;
 
-  if (auto Err = addProcessSymbols(S, IdxToJD))
-    return Err;
-
   return Error::success();
 }