[CMake] Support alternative C++ ABI library

Do not assume that every platform has libsupc++.

Differential Revision: https://reviews.llvm.org/D58598

llvm-svn: 354835

Author: petrhosek

CMakeLists.txt

@@ -155,6 +155,21 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${TEST_SUITE_EXTRA_CXX_FLAGS}")
 set(CMAKE_EXE_LINKER_FLAGS
     "${CMAKE_EXE_LINKER_FLAGS} ${TEST_SUITE_EXTRA_EXE_LINKER_FLAGS}")
 
+# This is either directly the C++ ABI library or the full C++ library
+# which pulls in the ABI transitively.
+set(TEST_SUITE_CXX_ABI "default" CACHE STRING "Specify C++ ABI library to use.")
+set(CXXABIS "none default libstdc++ libsupc++ libc++ libc++abi")
+set_property(CACHE TEST_SUITE_CXX_ABI PROPERTY STRINGS "${CXXABIS}")
+if (TEST_SUITE_CXX_ABI STREQUAL "default")
+  if (APPLE OR CMAKE_SYSTEM_NAME MATCHES "FreeBSD|Fuchsia")
+    set(TEST_SUITE_CXX_ABI_LIBNAME "c++abi")
+  else()
+    set(TEST_SUITE_CXX_ABI_LIBNAME "supc++")
+  endif()
+else()
+  STRING(REGEX REPLACE "^lib" "" TEST_SUITE_CXX_ABI_LIBNAME ${TEST_SUITE_CXX_ABI})
+endif()
+
 include(TestSuite)
 include(SingleMultiSource)
 find_package(TCL)

MultiSource/Applications/obsequi/CMakeLists.txt

@@ -6,7 +6,7 @@ else()
   list(APPEND CPPFLAGS -DHASHCODEBITS=23)
 endif()
 if(NOT "${ARCH}" STREQUAL "PowerPC")
-  list(APPEND LDFLAGS -lsupc++)
+  list(APPEND LDFLAGS -l${TEST_SUITE_CXX_ABI_LIBNAME})
 endif()
 set(RUN_OPTIONS < input)
 llvm_multisource(Obsequi)