[libunwind] Permit additional compiler and linker flags to be passed to tests.

Summary:
This is done via new LIBUNWIND_TEST_COMPILER_FLAGS and
LIBUNWIND_TEST_LINKER_FLAGS variables.

Reviewed By: sdardis

Differential Revision: https://reviews.llvm.org/D43585

2 files changed, 6 insertions, 0 deletions

diff --git a/libunwind/CMakeLists.txt b/libunwind/CMakeLists.txt
index 3a132be5496..31af0cbe10c 100644
--- a/libunwind/CMakeLists.txt
+++ b/libunwind/CMakeLists.txt
@@ -139,6 +139,10 @@ option(LIBUNWIND_INSTALL_LIBRARY "Install the libunwind library." ON)
 set(LIBUNWIND_TARGET_TRIPLE "" CACHE STRING "Target triple for cross compiling.")
 set(LIBUNWIND_GCC_TOOLCHAIN "" CACHE PATH "GCC toolchain for cross compiling.")
 set(LIBUNWIND_SYSROOT "" CACHE PATH "Sysroot for cross compiling.")
+set(LIBUNWIND_TEST_LINKER_FLAGS "" CACHE STRING
+    "Additional linker flags for test programs.")
+set(LIBUNWIND_TEST_COMPILER_FLAGS "" CACHE STRING
+    "Additional compiler flags for test programs.")
 
 if (NOT LIBUNWIND_ENABLE_SHARED AND NOT LIBUNWIND_ENABLE_STATIC)
   message(FATAL_ERROR "libunwind must be built as either a shared or static library.")
diff --git a/libunwind/test/lit.site.cfg.in b/libunwind/test/lit.site.cfg.in
index 888b96075f9..8e3bb72e0a4 100644
--- a/libunwind/test/lit.site.cfg.in
+++ b/libunwind/test/lit.site.cfg.in
@@ -12,6 +12,8 @@ config.enable_threads           = "@LIBUNWIND_ENABLE_THREADS@"
 config.use_sanitizer            = "@LLVM_USE_SANITIZER@"
 config.enable_32bit             = "@LIBUNWIND_BUILD_32_BITS@"
 config.target_info              = "@LIBUNWIND_TARGET_INFO@"
+config.test_linker_flags        = "@LIBUNWIND_TEST_LINKER_FLAGS@"
+config.test_compiler_flags      = "@LIBUNWIND_TEST_COMPILER_FLAGS@"
 config.executor                 = "@LIBUNWIND_EXECUTOR@"
 config.libunwind_shared         = "@LIBUNWIND_ENABLE_SHARED@"
 config.enable_shared            = "@LIBCXX_ENABLE_SHARED@"