[dfsan] Run the tests for each supported arch and suffix each one to distinguish them.

[dsanders]

Summary

Previously, the tests only ran for the 64-bit equivalent of the default target
(see -m64).
Given the supported architecture list only contains 64-bit targets, this happens
to work out the same as the supported targets in most cases but may matter for
X86_64/X86_64h on Darwin.

For other targets, the practical effect is that the test names contain the
architecture. This resolves some confusion when msan tests fail since their
name no longer implies that they are trying to test the default target.

[samsonov]

LGTM

test/dfsan/CMakeLists.txt

 set(DFSAN_LIT_TESTS_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 
+set(DFSAN_TESTSUITES)
+ 
+set(DFSAN_TEST_ARCH ${DFSAN_SUPPORTED_ARCH})
+if(APPLE)
+  darwin_filter_host_archs(DFSAN_SUPPORTED_ARCH DFSAN_TEST_ARCH)
+endif()
+
+foreach(arch ${DFSAN_TEST_ARCH})
+  string(TOLOWER "-${arch}" DFSAN_TEST_CONFIG_SUFFIX)
+  if(ANDROID OR ${arch} MATCHES "arm|aarch64")
+    # This is only true if we are cross-compiling.
+    # Build all tests with host compiler and use host tools.
+    set(DFSAN_TEST_TARGET_CC ${COMPILER_RT_TEST_COMPILER})
+    set(DFSAN_TEST_TARGET_CFLAGS ${COMPILER_RT_TEST_COMPILER_CFLAGS})
+  else()
+    get_target_flags_for_arch(${arch} DFSAN_TEST_TARGET_CFLAGS)
+    string(REPLACE ";" " " DFSAN_TEST_TARGET_CFLAGS "${DFSAN_TEST_TARGET_CFLAGS}")
+  endif()
+
+  string(TOUPPER ${arch} ARCH_UPPER_CASE)
+  set(CONFIG_NAME ${ARCH_UPPER_CASE}Config)
+
   configure_lit_site_cfg(
     ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
-  ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg)
+    ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/lit.site.cfg)
+  list(APPEND DFSAN_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME})
+endforeach()
 
 set(DFSAN_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS})
 if(NOT COMPILER_RT_STANDALONE_BUILD)
   list(APPEND DFSAN_TEST_DEPS dfsan)
 endif()
 
 add_lit_testsuite(check-dfsan "Running the DataFlowSanitizer tests"
-  ${CMAKE_CURRENT_BINARY_DIR}
+  ${DFSAN_TESTSUITES}
   DEPENDS ${DFSAN_TEST_DEPS})
 set_target_properties(check-dfsan PROPERTIES FOLDER "DFSan tests")

test/dfsan/lit.cfg

 # -*- Python -*-
 
 import os
 
 # Setup config name.
-config.name = 'DataFlowSanitizer'
+config.name = 'DataFlowSanitizer' + config.name_suffix
 
 # Setup source root.
 config.test_source_root = os.path.dirname(__file__)
 
 # Setup default compiler flags used with -fsanitize=dataflow option.
-clang_dfsan_cflags = ["-fsanitize=dataflow", "-m64"]
+clang_dfsan_cflags = ["-fsanitize=dataflow", config.target_cflags]
 clang_dfsan_cxxflags = config.cxx_mode_flags + clang_dfsan_cflags
 
 def build_invocation(compile_flags):
   return " " + " ".join([config.clang] + compile_flags) + " "
 
 config.substitutions.append( ("%clang_dfsan ", build_invocation(clang_dfsan_cflags)) )
 config.substitutions.append( ("%clangxx_dfsan ", build_invocation(clang_dfsan_cxxflags)) )
 
 # Default test suffixes.
 config.suffixes = ['.c', '.cc', '.cpp']
 
 # DataFlowSanitizer tests are currently supported on Linux only.
 if config.host_os not in ['Linux']:
   config.unsupported = True

test/dfsan/lit.site.cfg.in

+## Autogenerated by LLVM/Clang configuration.
+# Do not edit!
+
 # Load common config for all compiler-rt lit tests.
 lit_config.load_config(config, "@COMPILER_RT_BINARY_DIR@/test/lit.common.configured")
 
+# Tool-specific config options.
+config.name_suffix = "@DFSAN_TEST_CONFIG_SUFFIX@"
+config.target_cflags = "@DFSAN_TEST_TARGET_CFLAGS@"
+
 # Load tool-specific config that would do the real work.
 lit_config.load_config(config, "@DFSAN_LIT_TESTS_DIR@/lit.cfg")