From 15d8dfb6a0c7241845e4636cfc7d8cbf86108a08 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaricious@gmail.com>
Date: Sun, 28 Aug 2016 13:18:28 -0500
Subject: [PATCH] build llvm with systemz backend enabled, and link to related
 libraries

when building rust against system llvm

closes #36077
---
 configure                    | 2 +-
 mk/main.mk                   | 2 +-
 src/rustllvm/PassWrapper.cpp | 9 ++++++++-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index a48ff6a7610..44fb3d368d2 100755
--- a/configure
+++ b/configure
@@ -1747,7 +1747,7 @@ do
         CMAKE_ARGS="$CMAKE_ARGS -DLLVM_ENABLE_ASSERTIONS=ON"
     fi
 
-    CMAKE_ARGS="$CMAKE_ARGS -DLLVM_TARGETS_TO_BUILD='X86;ARM;AArch64;Mips;PowerPC'"
+    CMAKE_ARGS="$CMAKE_ARGS -DLLVM_TARGETS_TO_BUILD='X86;ARM;AArch64;Mips;PowerPC;SystemZ'"
     CMAKE_ARGS="$CMAKE_ARGS -G '$CFG_CMAKE_GENERATOR'"
     CMAKE_ARGS="$CMAKE_ARGS $CFG_LLVM_SRC_DIR"
 
diff --git a/mk/main.mk b/mk/main.mk
index 428d9d16182..5a849af9856 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -300,7 +300,7 @@ endif
 # LLVM macros
 ######################################################################
 
-LLVM_OPTIONAL_COMPONENTS=x86 arm aarch64 mips powerpc pnacl
+LLVM_OPTIONAL_COMPONENTS=x86 arm aarch64 mips powerpc pnacl systemz
 LLVM_REQUIRED_COMPONENTS=ipo bitreader bitwriter linker asmparser mcjit \
                 interpreter instrumentation
 
diff --git a/src/rustllvm/PassWrapper.cpp b/src/rustllvm/PassWrapper.cpp
index 0555a96ff24..a271987210b 100644
--- a/src/rustllvm/PassWrapper.cpp
+++ b/src/rustllvm/PassWrapper.cpp
@@ -131,12 +131,19 @@ LLVMRustAddPass(LLVMPassManagerRef PM, LLVMPassRef rust_pass) {
 #define SUBTARGET_PPC
 #endif
 
+#ifdef LLVM_COMPONENT_SYSTEMZ
+#define SUBTARGET_SYSTEMZ SUBTARGET(SystemZ)
+#else
+#define SUBTARGET_SYSTEMZ
+#endif
+
 #define GEN_SUBTARGETS    \
         SUBTARGET_X86     \
         SUBTARGET_ARM     \
         SUBTARGET_AARCH64 \
         SUBTARGET_MIPS    \
-        SUBTARGET_PPC
+        SUBTARGET_PPC     \
+        SUBTARGET_SYSTEMZ
 
 #define SUBTARGET(x) namespace llvm {                \
     extern const SubtargetFeatureKV x##FeatureKV[];  \