[libcxx] Support the use of compiler-rt in lit tests

Don't link tests against libgcc when compiler-rt is being used.

Differential Revision: https://reviews.llvm.org/D40513

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@322044 91177308-0d34-0410-b5e6-96231b3b80d8

test/CMakeLists.txt

@@ -30,6 +30,7 @@ pythonize_bool(LIBCXX_BUILD_32_BITS)
 pythonize_bool(LIBCXX_GENERATE_COVERAGE)
 pythonize_bool(LIBCXXABI_ENABLE_SHARED)
 pythonize_bool(LIBCXXABI_USE_LLVM_UNWINDER)
+pythonize_bool(LIBCXX_USE_COMPILER_RT)
 pythonize_bool(LIBCXX_HAS_ATOMIC_LIB)
 pythonize_bool(LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB)
 pythonize_bool(LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY)

test/lit.site.cfg.in

@@ -24,6 +24,7 @@ config.generate_coverage        = "@LIBCXX_GENERATE_COVERAGE@"
 config.target_info              = "@LIBCXX_TARGET_INFO@"
 config.executor                 = "@LIBCXX_EXECUTOR@"
 config.llvm_unwinder            = "@LIBCXXABI_USE_LLVM_UNWINDER@"
+config.compiler_rt              = "@LIBCXX_USE_COMPILER_RT@"
 config.has_libatomic            = "@LIBCXX_HAS_ATOMIC_LIB@"
 config.use_libatomic            = "@LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB@"
 config.debug_build              = "@LIBCXX_DEBUG_BUILD@"

utils/libcxx/test/target_info.py

@@ -234,6 +234,8 @@ class LinuxLocalTI(DefaultTargetInfo):
             flags += ['-lunwind', '-ldl']
         else:
             flags += ['-lgcc_s']
+        compiler_rt = self.full_config.get_lit_bool('compiler_rt', False)
+        if not compiler_rt:
             flags += ['-lgcc']
         use_libatomic = self.full_config.get_lit_bool('use_libatomic', False)
         if use_libatomic: