[compiler-rt] Build custom libcxx with libcxxabi

This changes add_custom_libcxx to also build libcxxabi and merges
the two into a static and hermetic library.
There are multiple advantages:
1) The resulting libFuzzer doesn't expose C++ internals and looks
   like a plain C library.
2) We don't have to manually link in libstdc++ to provide cxxabi.
3) The sanitizer tests cannot interfere with an installed version
   of libc++.so in LD_LIBRARY_PATH.

Differential Revision: https://reviews.llvm.org/D58013

llvm-svn: 354212

compiler-rt/CMakeLists.txt

@@ -484,6 +484,15 @@ if(COMPILER_RT_USE_LIBCXX)
       break()
     endif()
   endforeach()
+  foreach(path IN ITEMS ${LLVM_MAIN_SRC_DIR}/projects/libcxxabi
+                        ${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi
+                        ${LLVM_MAIN_SRC_DIR}/../libcxxabi
+                        ${LLVM_EXTERNAL_LIBCXXABI_SOURCE_DIR})
+    if(IS_DIRECTORY ${path})
+      set(COMPILER_RT_LIBCXXABI_PATH ${path})
+      break()
+    endif()
+  endforeach()
 endif()
 
 set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/tools/lld)

compiler-rt/cmake/Modules/AddCompilerRT.cmake

@@ -509,6 +509,9 @@ macro(add_custom_libcxx name prefix)
   if(NOT COMPILER_RT_LIBCXX_PATH)
     message(FATAL_ERROR "libcxx not found!")
   endif()
+  if(NOT COMPILER_RT_LIBCXXABI_PATH)
+    message(FATAL_ERROR "libcxxabi not found!")
+  endif()
 
   cmake_parse_arguments(LIBCXX "USE_TOOLCHAIN" "" "DEPS;CFLAGS;CMAKE_ARGS" ${ARGN})
 
@@ -584,7 +587,7 @@ macro(add_custom_libcxx name prefix)
   ExternalProject_Add(${name}
     DEPENDS ${name}-clobber ${LIBCXX_DEPS}
     PREFIX ${prefix}
-    SOURCE_DIR ${COMPILER_RT_LIBCXX_PATH}
+    SOURCE_DIR ${COMPILER_RT_SOURCE_DIR}/cmake/Modules/CustomLibcxx
     STAMP_DIR ${STAMP_DIR}
     BINARY_DIR ${BINARY_DIR}
     CMAKE_ARGS ${CMAKE_PASSTHROUGH_VARIABLES}
@@ -595,7 +598,8 @@ macro(add_custom_libcxx name prefix)
                -DLLVM_PATH=${LLVM_MAIN_SRC_DIR}
                -DLLVM_BINARY_DIR=${prefix}
                -DLLVM_LIBRARY_OUTPUT_INTDIR=${prefix}/lib
-               -DLIBCXX_STANDALONE_BUILD=ON
+               -DCOMPILER_RT_LIBCXX_PATH=${COMPILER_RT_LIBCXX_PATH}
+               -DCOMPILER_RT_LIBCXXABI_PATH=${COMPILER_RT_LIBCXXABI_PATH}
                ${LIBCXX_CMAKE_ARGS}
     INSTALL_COMMAND ""
     STEP_TARGETS configure build

compiler-rt/cmake/Modules/CustomLibcxx/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.4.3)
+
+# Build static libcxxabi.
+set(LIBCXXABI_STANDALONE_BUILD 1)
+set(LIBCXXABI_ENABLE_SHARED OFF CACHE BOOL "")
+set(LIBCXXABI_HERMETIC_STATIC_LIBRARY ON CACHE STRING "")
+set(LIBCXXABI_LIBCXX_PATH ${COMPILER_RT_LIBCXX_PATH} CACHE PATH "")
+set(LIBCXXABI_INCLUDE_TESTS OFF CACHE BOOL "")
+add_subdirectory(${COMPILER_RT_LIBCXXABI_PATH} ${CMAKE_CURRENT_BINARY_DIR}/cxxabi)
+
+# Build static libcxx without exceptions.
+set(LIBCXX_STANDALONE_BUILD 1)
+set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
+set(LIBCXX_HERMETIC_STATIC_LIBRARY ON CACHE BOOL "")
+
+# Use above libcxxabi.
+set(LIBCXX_CXX_ABI "libcxxabi" CACHE STRING "")
+set(LIBCXX_CXX_ABI_INTREE 1)
+set(LIBCXX_ENABLE_STATIC_ABI_LIBRARY ON CACHE BOOL "")
+set(LIBCXX_CXX_ABI_INCLUDE_PATHS ${COMPILER_RT_LIBCXXABI_PATH}/include CACHE PATH "")
+
+add_subdirectory(${COMPILER_RT_LIBCXX_PATH} ${CMAKE_CURRENT_BINARY_DIR}/cxx)

compiler-rt/lib/fuzzer/CMakeLists.txt

@@ -55,7 +55,9 @@ CHECK_CXX_SOURCE_COMPILES("
 
 set(LIBFUZZER_CFLAGS ${SANITIZER_COMMON_CFLAGS})
 
-if(OS_NAME MATCHES "Linux|Fuchsia" AND COMPILER_RT_LIBCXX_PATH)
+if(OS_NAME MATCHES "Linux|Fuchsia" AND
+   COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH)
   list(APPEND LIBFUZZER_CFLAGS -nostdinc++ -D_LIBCPP_ABI_VERSION=Fuzzer)
   # Remove -stdlib= which is unused when passing -nostdinc++.
   string(REGEX REPLACE "-stdlib=[a-zA-Z+]*" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
@@ -113,7 +115,9 @@ add_compiler_rt_runtime(clang_rt.fuzzer_no_main
   CFLAGS ${LIBFUZZER_CFLAGS}
   PARENT_TARGET fuzzer)
 
-if(OS_NAME MATCHES "Linux|Fuchsia" AND COMPILER_RT_LIBCXX_PATH)
+if(OS_NAME MATCHES "Linux|Fuchsia" AND
+   COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH)
   macro(partially_link_libcxx name dir arch)
     set(cxx_${arch}_merge_dir "${CMAKE_CURRENT_BINARY_DIR}/cxx_${arch}_merge.dir")
     file(MAKE_DIRECTORY ${cxx_${arch}_merge_dir})
@@ -131,13 +135,8 @@ if(OS_NAME MATCHES "Linux|Fuchsia" AND COMPILER_RT_LIBCXX_PATH)
     set(LIBCXX_${arch}_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/libcxx_fuzzer_${arch})
     add_custom_libcxx(libcxx_fuzzer_${arch} ${LIBCXX_${arch}_PREFIX}
       CFLAGS ${TARGET_CFLAGS}
-             -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS=1
-             -fvisibility=hidden
       CMAKE_ARGS -DCMAKE_CXX_COMPILER_WORKS=ON
-                 -DLIBCXX_ENABLE_EXCEPTIONS=OFF
-                 -DLIBCXX_ENABLE_SHARED=OFF
-                 -DLIBCXX_ABI_NAMESPACE=Fuzzer
-                 -DLIBCXX_CXX_ABI=none)
+                 -DLIBCXX_ABI_NAMESPACE=Fuzzer)
     target_compile_options(RTfuzzer.${arch} PRIVATE -isystem ${LIBCXX_${arch}_PREFIX}/include/c++/v1)
     add_dependencies(RTfuzzer.${arch} libcxx_fuzzer_${arch}-build)
     target_compile_options(RTfuzzer_main.${arch} PRIVATE -isystem ${LIBCXX_${arch}_PREFIX}/include/c++/v1)

compiler-rt/lib/fuzzer/tests/CMakeLists.txt

@@ -24,7 +24,9 @@ if(NOT WIN32)
   list(APPEND LIBFUZZER_UNITTEST_LINK_FLAGS -lpthread)
 endif()
 
-if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux" AND COMPILER_RT_LIBCXX_PATH)
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
+   COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH)
   list(APPEND LIBFUZZER_UNITTEST_CFLAGS -nostdinc++)
 endif()
 
@@ -46,7 +48,9 @@ if(COMPILER_RT_DEFAULT_TARGET_ARCH IN_LIST FUZZER_SUPPORTED_ARCH)
     ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     FOLDER "Compiler-RT Runtime tests")
 
-  if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux" AND COMPILER_RT_LIBCXX_PATH)
+  if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
+     COMPILER_RT_LIBCXX_PATH AND
+     COMPILER_RT_LIBCXXABI_PATH)
     file(GLOB libfuzzer_headers ../*.h)
     set(LIBFUZZER_TEST_RUNTIME_DEPS libcxx_fuzzer_${arch}-build ${libfuzzer_headers})
     set(LIBFUZZER_TEST_RUNTIME_CFLAGS -isystem ${LIBCXX_${arch}_PREFIX}/include/c++/v1)

compiler-rt/lib/msan/tests/CMakeLists.txt

@@ -48,10 +48,8 @@ set(MSAN_UNITTEST_INSTRUMENTED_CFLAGS
 )
 set(MSAN_UNITTEST_LINK_FLAGS
   -fsanitize=memory
-  # Don't need -stdlib=libc++ because we explicitly list libc++.so in the linker
+  # Don't need -stdlib=libc++ because we explicitly list libc++.a in the linker
   # inputs.
-  # FIXME: we build libcxx without cxxabi and need libstdc++ to provide it.
-  -lstdc++
 )
 
 append_list_if(COMPILER_RT_HAS_LIBDL -ldl MSAN_UNITTEST_LINK_FLAGS)
@@ -116,16 +114,16 @@ macro(add_msan_tests_for_arch arch kind cflags)
   endif()
   get_target_flags_for_arch(${arch} TARGET_LINK_FLAGS)
   add_compiler_rt_test(MsanUnitTests "Msan-${arch}${kind}-Test" ${arch}
-    OBJECTS ${MSAN_TEST_OBJECTS} ${MSAN_LIBCXX_SO}
+    OBJECTS ${MSAN_TEST_OBJECTS} "${MSAN_LIBCXX_DIR}/libc++.a"
     DEPS ${MSAN_TEST_DEPS}
     LINK_FLAGS ${MSAN_UNITTEST_LINK_FLAGS}
-               ${TARGET_LINK_FLAGS}
-               "-Wl,-rpath=${CMAKE_CURRENT_BINARY_DIR}"
-               "-Wl,-rpath=${LIBCXX_PREFIX}/lib")
+               ${TARGET_LINK_FLAGS})
 endmacro()
 
 # We should only build MSan unit tests if we can build instrumented libcxx.
-if(COMPILER_RT_CAN_EXECUTE_TESTS AND COMPILER_RT_LIBCXX_PATH)
+if(COMPILER_RT_CAN_EXECUTE_TESTS AND
+   COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH)
   foreach(arch ${MSAN_SUPPORTED_ARCH})
     get_target_flags_for_arch(${arch} TARGET_CFLAGS)
     set(LIBCXX_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/../libcxx_msan_${arch})
@@ -133,7 +131,7 @@ if(COMPILER_RT_CAN_EXECUTE_TESTS AND COMPILER_RT_LIBCXX_PATH)
       DEPS ${MSAN_RUNTIME_LIBRARIES}
       CFLAGS ${MSAN_LIBCXX_CFLAGS} ${TARGET_CFLAGS}
       USE_TOOLCHAIN)
-    set(MSAN_LIBCXX_SO ${LIBCXX_PREFIX}/lib/libc++.so)
+    set(MSAN_LIBCXX_DIR ${LIBCXX_PREFIX}/lib/)
 
     add_msan_tests_for_arch(${arch} "" "")
     add_msan_tests_for_arch(${arch} "-with-call"

compiler-rt/lib/tsan/CMakeLists.txt

@@ -236,6 +236,7 @@ endif()
 
 # Build libcxx instrumented with TSan.
 if(COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH AND
    COMPILER_RT_TEST_COMPILER_ID STREQUAL "Clang" AND
    NOT ANDROID)
   set(libcxx_tsan_deps)

compiler-rt/test/fuzzer/lit.cfg

@@ -63,17 +63,6 @@ config.substitutions.append(('%libfuzzer_src', libfuzzer_src_root))
 def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True, msan_enabled=False):
   compiler_cmd = config.clang
   extra_cmd = config.target_flags
-  if config.clang and config.stdlib == 'libc++':
-    link_cmd = '-stdlib=libc++ -Wl,-rpath=%s' % config.runtime_library_dir
-  elif config.clang and config.stdlib == 'static-libc++':
-    link_cmd = '-stdlib=libc++ -lc++abi -static-libstdc++ -Wl,-rpath=%s' % (
-        config.runtime_library_dir)
-  elif any(x in config.target_triple for x in ('darwin', 'freebsd')):
-    link_cmd = '-lc++'
-  elif 'windows-msvc' in config.target_triple:
-    link_cmd = ''
-  else:
-    link_cmd = '-lstdc++'
 
   if is_cpp and 'windows-msvc' in config.target_triple:
     std_cmd = '--driver-mode=cl'
@@ -92,7 +81,6 @@ def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True, msan_enabled=False):
   return " ".join([
     compiler_cmd,
     std_cmd,
-    link_cmd,
     "-O2 -gline-tables-only",
     sanitizers_cmd,
     "-I%s" % libfuzzer_src_root,

compiler-rt/test/msan/CMakeLists.txt

@@ -43,7 +43,9 @@ if(NOT COMPILER_RT_STANDALONE_BUILD)
   list(APPEND MSAN_TEST_DEPS msan)
 endif()
 
-if(COMPILER_RT_INCLUDE_TESTS AND COMPILER_RT_LIBCXX_PATH)
+if(COMPILER_RT_INCLUDE_TESTS AND
+   COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH)
   configure_lit_site_cfg(
     ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.in
     ${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg)

compiler-rt/test/tsan/CMakeLists.txt

@@ -8,6 +8,7 @@ if(NOT COMPILER_RT_STANDALONE_BUILD)
   list(APPEND TSAN_TEST_DEPS tsan)
 endif()
 if(COMPILER_RT_LIBCXX_PATH AND
+   COMPILER_RT_LIBCXXABI_PATH AND
    COMPILER_RT_TEST_COMPILER_ID STREQUAL "Clang"
    AND NOT APPLE AND NOT ANDROID)
   list(APPEND TSAN_TEST_DEPS libcxx_tsan)

compiler-rt/test/tsan/Linux/check_memcpy.c

@@ -1,8 +1,8 @@
 // Test that verifies TSan runtime doesn't contain compiler-emitted
-// memcpy/memmove calls. It builds the binary with TSan and passes it to
-// check_memcpy.sh script.
+// memcpy/memmove calls. It builds the binary with TSan and check's
+// its objdump.
 
-// RUN: %clangxx_tsan -O1 %s -o %t
+// RUN: %clang_tsan -O1 %s -o %t
 // RUN: llvm-objdump -d %t | FileCheck %s
 
 // REQUIRES: compiler-rt-optimized

compiler-rt/test/tsan/lit.cfg

@@ -38,7 +38,7 @@ config.substitutions.append(('%env_tsan_opts=',
 
 # GCC driver doesn't add necessary compile/link flags with -fsanitize=thread.
 if config.compiler_id == 'GNU':
-  extra_cflags = ["-fPIE", "-pthread", "-ldl", "-lstdc++", "-lrt", "-pie"]
+  extra_cflags = ["-fPIE", "-pthread", "-ldl", "-lrt", "-pie"]
 else:
   extra_cflags = []
 
@@ -59,11 +59,10 @@ if config.has_libcxx and config.host_os != 'Darwin':
                              "tsan", "libcxx_tsan_%s" % config.target_arch)
   libcxx_incdir = os.path.join(libcxx_path, "include", "c++", "v1")
   libcxx_libdir = os.path.join(libcxx_path, "lib")
-  libcxx_so = os.path.join(libcxx_libdir, "libc++.so")
+  libcxx_a = os.path.join(libcxx_libdir, "libc++.a")
   clang_tsan_cxxflags += ["-nostdinc++",
                           "-I%s" % libcxx_incdir,
-                          libcxx_so,
-                          "-Wl,-rpath=%s" % libcxx_libdir]
+                          libcxx_a]
 
 def build_invocation(compile_flags):
   return " " + " ".join([config.clang] + compile_flags) + " "

compiler-rt/test/tsan/static_init6.cc

@@ -1,5 +1,4 @@
-// RUN: %clangxx_tsan %linux_static_libstdcplusplus -O1 %s -o %t && %run %t 2>&1 \
-// RUN: | FileCheck %s
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
 #include <pthread.h>
 #include <stdlib.h>
 #include <stdio.h>

libcxx/CMakeLists.txt

@@ -23,7 +23,7 @@ set(CMAKE_MODULE_PATH
   ${CMAKE_MODULE_PATH}
   )
 
-if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUILD)
   project(libcxx CXX C)
 
   set(PACKAGE_NAME libcxx)

libcxx/cmake/Modules/HandleLibCXXABI.cmake

@@ -98,7 +98,7 @@ if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++" OR
 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi")
   if (LIBCXX_CXX_ABI_INTREE)
     # Link against just-built "cxxabi" target.
-    if (LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY)
+    if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
       set(CXXABI_LIBNAME cxxabi_static)
     else()
       set(CXXABI_LIBNAME cxxabi_shared)

libcxxabi/CMakeLists.txt

@@ -17,7 +17,7 @@ set(CMAKE_MODULE_PATH
   ${CMAKE_MODULE_PATH}
   )
 
-if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXXABI_STANDALONE_BUILD)
   project(libcxxabi CXX C)
 
   set(PACKAGE_NAME libcxxabi)