[libcxxabi] Enable testing for static libc++abi

[bcraig]

Summary

This change leverages framework changes made in libcxx. See those changes for
more details. (http://reviews.llvm.org/D16544)

Some Mac specific logic for testing against libc++abi had to be moved from
libcxxabi's config.py, as it was overriding choices made in libcxx's config.py.
That logic is now in libcxx's target_info.py.

[bcraig]

ping

[bcraig]

ping

[EricWF]

test/CMakeLists.txt

10

This seems wrong for out of tree builds because LIBCXX_ENABLE_SHARED will not be defined and will result in the default "False".

[bcraig]

Addressed EricWF's feedback.

[bcraig]

ping

[bcraig]

ping

[bcraig]

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[EricWF]

This part LGTM. Sorry about the delay.

CMakeLists.txt

187

This variable should still probably be re-set even if it's given on the command line. By doing that you update the type and help text for the variable in the cache.

[bcraig]

EricWF's feedback. I plan on submitting this tomorrow morning.

[bcraig]

r266729

[rmaprath]

Hmmm, it looks like part of this patch didn't go in? I cannot see the changes in the libcxxabi/CMakeLists.txt file in the repo.

I was hoping this would enable me to run the libc++abi tests on in-tree static builds, but I still can't.

Perhaps you forgot to commit that file?

[bcraig]

In D16545#444854, @rmaprath wrote:

Hmmm, it looks like part of this patch didn't go in? I cannot see the changes in the libcxxabi/CMakeLists.txt file in the repo.

I was hoping this would enable me to run the libc++abi tests on in-tree static builds, but I still can't.

Perhaps you forgot to commit that file?

Hrm, you're right, it didn't go in. I'll get it in tomorrow morning.

[bcraig]

In D16545#444869, @bcraig wrote:

In D16545#444854, @rmaprath wrote:

Perhaps you forgot to commit that file?

Hrm, you're right, it didn't go in. I'll get it in tomorrow morning.

Should be in now. r271388.

[rmaprath]

Works great. Thanks!

CMakeLists.txt

 option(LIBCXXABI_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
 option(LIBCXXABI_USE_LLVM_UNWINDER "Build and use the LLVM unwinder." OFF)
 option(LIBCXXABI_ENABLE_THREADS "Build with threads enabled" ON)
-set(LIBCXXABI_GCC_TOOLCHAIN "" CACHE STRING "GCC toolchain for cross compiling.")
-set(LIBCXXABI_SYSROOT "" CACHE STRING "Sysroot for cross compiling.")
-set(LIBCXXABI_LIBCXX_LIBRARY_PATH "" CACHE STRING "The path to libc++ library.")
+set(LIBCXXABI_GCC_TOOLCHAIN "" CACHE PATH "GCC toolchain for cross compiling.")
+set(LIBCXXABI_SYSROOT "" CACHE PATH "Sysroot for cross compiling.")
 
 # Default to building a shared library so that the default options still test
 # the libc++abi that is being built. There are two problems with testing a

 set(LIBCXXABI_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
 set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
 
+# By default, for non-standalone builds, libcxx and libcxxabi share a library
+# directory.
+if (NOT LIBCXXABI_LIBCXX_LIBRARY_PATH)
+  set(LIBCXXABI_LIBCXX_LIBRARY_PATH "${LIBCXXABI_LIBRARY_DIR}" CACHE PATH
+      "The path to libc++ library.")
+endif ()
+
 #===============================================================================
 # Setup Compiler Flags
 #===============================================================================

 # soname, etc...
 add_subdirectory(src)
 
-if(NOT LIBCXXABI_ENABLE_SHARED)
-  # TODO: Fix the libc++ cmake files so that libc++abi can be statically linked.
-  # As it is now, libc++ will prefer linking against a dynamic libc++abi in the
-  # system library paths over a static libc++abi in the out directory. This
-  # would test the system library rather than the one we just built, which isn't
-  # very helpful.
-  message(WARNING "The libc++abi tests are currently only valid when "
-                  "LIBCXXABI_ENABLE_SHARED is on, no check target will be "
+if (LIBCXXABI_BUILT_STANDALONE AND NOT LIBCXXABI_ENABLE_SHARED)
+  # We can't reasonably test the system C++ library with a static libc++abi.
+  # We either need to be able to replace libc++abi at run time (with a shared
+  # libc++abi), or we need to be able to replace the C++ runtime (with a non-
+  # standalone build).
+  message(WARNING "The libc++abi tests aren't valid when libc++abi is built "
+                  "standalone (i.e. outside of llvm/projects/libcxxabi ) and "
+                  "is built without a shared library.  Either build a shared "
+                  "library, build libc++abi at the same time as you build "
+                  "libc++, or do without testing.  No check target will be "
                   "available!")
 else()
   add_subdirectory(test)

test/CMakeLists.txt

   endif()
 endmacro()
 
+if (NOT DEFINED LIBCXX_ENABLE_SHARED)
+  set(LIBCXX_ENABLE_SHARED ON)
+endif()
+
 pythonize_bool(LLVM_BUILD_32_BITS)
+pythonize_bool(LIBCXX_ENABLE_SHARED)
 pythonize_bool(LIBCXXABI_ENABLE_SHARED)
 pythonize_bool(LIBCXXABI_ENABLE_THREADS)
 pythonize_bool(LIBCXXABI_USE_LLVM_UNWINDER)

   ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
   @ONLY)
 
-set(LIBCXXABI_TEST_DEPS cxxabi_shared)
+if (LIBCXXABI_ENABLE_SHARED)
+  set(LIBCXXABI_TEST_DEPS cxxabi_shared)
+else()
+  set(LIBCXXABI_TEST_DEPS cxxabi_static)
+endif()
+
 if (NOT LIBCXXABI_BUILT_STANDALONE)
   list(APPEND LIBCXXABI_TEST_DEPS cxx)
 endif()

test/libcxxabi/test/config.py

 
     def configure_compile_flags_rtti(self):
         pass
-
-    # TODO(ericwf): Remove this. This is a hack for OS X.
-    # libc++ *should* export all of the symbols found in libc++abi on OS X.
-    # For this reason LibcxxConfiguration will not link libc++abi in OS X.
-    # However __cxa_throw_bad_new_array_length doesn't get exported into libc++
-    # yet so we still need to explicitly link libc++abi.
-    # See PR22654.
-    def configure_link_flags_abi_library(self):
-        self.cxx.link_flags += ['-lc++abi']
-

test/lit.site.cfg.in

 config.enable_32bit             = "@LLVM_BUILD_32_BITS@"
 config.target_info              = "@LIBCXXABI_TARGET_INFO@"
 config.executor                 = "@LIBCXXABI_EXECUTOR@"
+config.libcxxabi_shared         = "@LIBCXXABI_ENABLE_SHARED@"
+config.enable_shared            = "@LIBCXX_ENABLE_SHARED@"
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@LIBCXXABI_SOURCE_DIR@/test/lit.cfg")