diff --git a/llvm/test/lit.cfg.py b/llvm/test/lit.cfg.py
--- a/llvm/test/lit.cfg.py
+++ b/llvm/test/lit.cfg.py
@@ -115,6 +115,8 @@
 asan_rtlib = get_asan_rtlib()
 if asan_rtlib:
     ld64_cmd = 'DYLD_INSERT_LIBRARIES={} {}'.format(asan_rtlib, ld64_cmd)
+if config.osx_sysroot:
+    ld64_cmd = '{} -syslibroot {}'.format(ld64_cmd, config.osx_sysroot)
 
 ocamlc_command = '%s ocamlc -cclib -L%s %s' % (
     config.ocamlfind_executable, config.llvm_lib_dir, config.ocaml_flags)
diff --git a/llvm/test/lit.site.cfg.py.in b/llvm/test/lit.site.cfg.py.in
--- a/llvm/test/lit.site.cfg.py.in
+++ b/llvm/test/lit.site.cfg.py.in
@@ -17,6 +17,7 @@
 config.python_executable = "@Python3_EXECUTABLE@"
 config.gold_executable = "@GOLD_EXECUTABLE@"
 config.ld64_executable = "@LD64_EXECUTABLE@"
+config.osx_sysroot = "@CMAKE_OSX_SYSROOT@"
 config.ocamlfind_executable = "@OCAMLFIND@"
 config.have_ocamlopt = @HAVE_OCAMLOPT@
 config.have_ocaml_ounit = @HAVE_OCAML_OUNIT@
diff --git a/llvm/test/tools/lto/hide-linkonce-odr.ll b/llvm/test/tools/lto/hide-linkonce-odr.ll
--- a/llvm/test/tools/lto/hide-linkonce-odr.ll
+++ b/llvm/test/tools/lto/hide-linkonce-odr.ll
@@ -1,5 +1,5 @@
 ; RUN: llvm-as %s -o %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -dylib -arch x86_64 -macosx_version_min 10.10.0 -o %t.dylib %t.o -save-temps  -undefined dynamic_lookup -exported_symbol _c -exported_symbol _b  -exported_symbol _GlobLinkonce
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -dylib -arch x86_64 -macosx_version_min 10.10.0 -o %t.dylib %t.o -save-temps  -undefined dynamic_lookup -exported_symbol _c -exported_symbol _b  -exported_symbol _GlobLinkonce -lSystem
 
 ; RUN: llvm-dis %t.dylib.lto.opt.bc -o - | FileCheck --check-prefix=IR %s
 ; check that @a is no longer a linkonce_odr definition
diff --git a/llvm/test/tools/lto/no-bitcode.s b/llvm/test/tools/lto/no-bitcode.s
--- a/llvm/test/tools/lto/no-bitcode.s
+++ b/llvm/test/tools/lto/no-bitcode.s
@@ -2,4 +2,4 @@
 ; libLTO.dylib shouldn't assert on invalid inputs.
 ; RUN: llvm-mc -triple=arm64-apple-ios7.0.0 -filetype=obj -o %t.o
 ; RUN: llvm-ar r %t.a %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O0 -o %t.dylib %t.a
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O0 -o %t.dylib %t.a -lSystem
diff --git a/llvm/test/tools/lto/opt-level.ll b/llvm/test/tools/lto/opt-level.ll
--- a/llvm/test/tools/lto/opt-level.ll
+++ b/llvm/test/tools/lto/opt-level.ll
@@ -1,7 +1,7 @@
 ; RUN: llvm-as %s -o %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O0 -o %t.dylib %t.o
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O0 -o %t.dylib %t.o -lSystem
 ; RUN: llvm-nm --no-llvm-bc %t.dylib | FileCheck --check-prefix=CHECK-O0 %s
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O2 -o %t.dylib %t.o
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O2 -o %t.dylib %t.o -lSystem
 ; RUN: llvm-nm --no-llvm-bc %t.dylib | FileCheck --check-prefix=CHECK-O2 %s
 
 target triple = "x86_64-apple-macosx10.8.0"
diff --git a/llvm/test/tools/lto/print-stats.ll b/llvm/test/tools/lto/print-stats.ll
--- a/llvm/test/tools/lto/print-stats.ll
+++ b/llvm/test/tools/lto/print-stats.ll
@@ -1,6 +1,6 @@
 ; RUN: llvm-as %s -o %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -stats -o %t.dylib %t.o 2>&1 | FileCheck --check-prefix=STATS %s
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -o %t.dylib %t.o 2>&1 | FileCheck --check-prefix=NO_STATS %s
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -stats -o %t.dylib %t.o -lSystem 2>&1 | FileCheck --check-prefix=STATS %s
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -o %t.dylib %t.o -lSystem 2>&1 | FileCheck --check-prefix=NO_STATS %s
 ; REQUIRES: asserts
 
 target triple = "x86_64-apple-macosx10.8.0"