diff --git a/clang/test/Headers/arm-fp16-header.c b/clang/test/Headers/arm-fp16-header.c
index 556854023dff8..b1a87faebfe0b 100644
--- a/clang/test/Headers/arm-fp16-header.c
+++ b/clang/test/Headers/arm-fp16-header.c
@@ -1,20 +1,20 @@
-// RUN: %clang -fsyntax-only  -ffreestanding              --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c89 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c99 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c11 -xc %s
+// RUN: %clang -fsyntax-only  -ffreestanding              --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c89 --sysroot=%S/Inputs -xc %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c99 --sysroot=%S/Inputs -xc %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c11 --sysroot=%S/Inputs -xc %s
 
-// RUN: %clang -fsyntax-only -ffreestanding               --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c89 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c99 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c11 -xc %s
+// RUN: %clang -fsyntax-only -ffreestanding               --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c89 --sysroot=%S/Inputs -xc %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c99 --sysroot=%S/Inputs -xc %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c11 --sysroot=%S/Inputs -xc %s
 
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++98 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++11 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++14 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++17 -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++98 --sysroot=%S/Inputs -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++11 --sysroot=%S/Inputs -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++14 --sysroot=%S/Inputs -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++17 --sysroot=%S/Inputs -xc++ %s
 
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++98 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++11 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++14 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++17 -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++98 --sysroot=%S/Inputs -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++11 --sysroot=%S/Inputs -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++14 --sysroot=%S/Inputs -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++17 --sysroot=%S/Inputs -xc++ %s
 
 // REQUIRES: aarch64-registered-target || arm-registered-target
 
diff --git a/clang/test/Headers/arm-neon-header.c b/clang/test/Headers/arm-neon-header.c
index 703424f17bde7..7e98d03dfc191 100644
--- a/clang/test/Headers/arm-neon-header.c
+++ b/clang/test/Headers/arm-neon-header.c
@@ -2,27 +2,27 @@
 // RUN: %clang_cc1 -triple thumbv7-apple-darwin10 -target-cpu cortex-a8 -fsyntax-only -flax-vector-conversions=none -ffreestanding %s
 // RUN: %clang_cc1 -x c++ -triple thumbv7-apple-darwin10 -target-cpu cortex-a8 -fsyntax-only -Wvector-conversions -ffreestanding %s
 
-// RUN: %clang -fsyntax-only               -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c89 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c99 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c11 -xc %s
+// RUN: %clang -fsyntax-only               -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c89 --sysroot=%S/Inputs -xc %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c99 --sysroot=%S/Inputs -xc %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c11 --sysroot=%S/Inputs -xc %s
 
-// RUN: %clang -fsyntax-only               -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c89 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c99 -xc %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c11 -xc %s
+// RUN: %clang -fsyntax-only               -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c89 -xc --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c99 -xc --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c11 -xc --sysroot=%S/Inputs %s
 
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++98 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++11 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++14 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++17 -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++98 -xc++ --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++11 -xc++ --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++14 -xc++ --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64-none-elf -march=armv8.2-a+fp16 -std=c++17 -xc++ --sysroot=%S/Inputs %s
 
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++98 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++11 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++14 -xc++ %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++17 -xc++ %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++98 -xc++ --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++11 -xc++ --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++14 -xc++ --sysroot=%S/Inputs %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding -nostdinc++ --target=aarch64_be-none-elf -march=armv8.2-a+fp16 -std=c++17 -xc++ --sysroot=%S/Inputs %s
 
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16fml+crypto+dotprod -std=c11 -xc -flax-vector-conversions=none %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16fml+crypto+dotprod -std=c11 -xc -flax-vector-conversions=none %s
-// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=arm64-linux-gnu -arch +neon -std=c11 -xc -flax-vector-conversions=none %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64-none-elf -march=armv8.2-a+fp16fml+crypto+dotprod -std=c11 -xc --sysroot=%S/Inputs -flax-vector-conversions=none %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=aarch64_be-none-elf -march=armv8.2-a+fp16fml+crypto+dotprod -std=c11 -xc --sysroot=%S/Inputs -flax-vector-conversions=none %s
+// RUN: %clang -fsyntax-only -Wall -Werror -ffreestanding --target=arm64-linux-gnu -arch +neon -std=c11 -xc --sysroot=%S/Inputs -flax-vector-conversions=none %s
 
 // REQUIRES: aarch64-registered-target || arm-registered-target