From 4bba4ba5bae3a18ea8cbde0e99ab2416bc0ea8e5 Mon Sep 17 00:00:00 2001
From: Tobias Grosser <tobias@grosser.es>
Date: Sat, 24 Jun 2017 08:09:33 +0000
Subject: [PATCH] Ensure backends available in 'opt' are also available in
 'bugpoint'

This patch links LLVM back-ends into bugpoint the same way they are already
available in 'opt' and 'clang'. This resolves an inconsistency that allowed the
use of LLVM backends in loadable modules that run in 'opt', but that would
prevent the debugging of these modules with bugpoint due to unavailable /
unresolved symbols.

For e.g. In D31859, Polly requires the NVPTX back-end.

Reviewers: hfinkel, bogner, chandlerc, grosser, Meinersbur

Subscribers: bollu, mgorny, grosser, Meinersbur

Tags: #polly

Contributed by: Singapuram Sanjay

Differential Revision: https://reviews.llvm.org/D32003

llvm-svn: 306208
---
 llvm/tools/bugpoint/CMakeLists.txt | 1 +
 llvm/tools/bugpoint/LLVMBuild.txt  | 1 +
 llvm/tools/bugpoint/bugpoint.cpp   | 9 +++++++++
 3 files changed, 11 insertions(+)

diff --git a/llvm/tools/bugpoint/CMakeLists.txt b/llvm/tools/bugpoint/CMakeLists.txt
index 7598657427e8..8975e6763434 100644
--- a/llvm/tools/bugpoint/CMakeLists.txt
+++ b/llvm/tools/bugpoint/CMakeLists.txt
@@ -1,4 +1,5 @@
 set(LLVM_LINK_COMPONENTS
+  ${LLVM_TARGETS_TO_BUILD}
   Analysis
   BitWriter
   CodeGen
diff --git a/llvm/tools/bugpoint/LLVMBuild.txt b/llvm/tools/bugpoint/LLVMBuild.txt
index 37a605870548..68ecb8c8f4f9 100644
--- a/llvm/tools/bugpoint/LLVMBuild.txt
+++ b/llvm/tools/bugpoint/LLVMBuild.txt
@@ -30,3 +30,4 @@ required_libraries =
  Linker
  ObjCARC
  Scalar
+ all-targets
diff --git a/llvm/tools/bugpoint/bugpoint.cpp b/llvm/tools/bugpoint/bugpoint.cpp
index 85c1ddd8277d..a486342457c5 100644
--- a/llvm/tools/bugpoint/bugpoint.cpp
+++ b/llvm/tools/bugpoint/bugpoint.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Signals.h"
+#include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/Valgrind.h"
 #include "llvm/Transforms/IPO/AlwaysInliner.h"
 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
@@ -138,6 +139,14 @@ int main(int argc, char **argv) {
   polly::initializePollyPasses(Registry);
 #endif
 
+  if (std::getenv("bar") == (char*) -1) {
+    InitializeAllTargets();
+    InitializeAllTargetMCs();
+    InitializeAllAsmPrinters();
+    InitializeAllAsmParsers();
+    InitializeAllDisassemblers();
+  }
+
   cl::ParseCommandLineOptions(argc, argv,
                               "LLVM automatic testcase reducer. See\nhttp://"
                               "llvm.org/cmds/bugpoint.html"
-- 
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