[PATCH] light up UBSan for ARMv7

[Greg Fitzgerald]

Hi samsonov, eugenis, kcc,

 You can expect UBSan to be built under any of the following conditions:
    
    1) CMAKE_C_COMPILER is GCC built to cross-compile to ARM
    2) CMAKE_C_COMPILER is Clang built to cross-compile to ARM (ARM is default target)
    3) CMAKE_C_COMPILER is Clang and CMAKE_C_FLAGS contains -target and --sysroot

http://reviews.llvm.org/D3794

Files:
  CMakeLists.txt

Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -215,9 +215,8 @@
     test_target_arch(i386 ${TARGET_32_BIT_CFLAGS})
   elseif("${LLVM_NATIVE_ARCH}" STREQUAL "PowerPC")
     test_target_arch(powerpc64 ${TARGET_64_BIT_CFLAGS})
-  elseif("${LLVM_NATIVE_ARCH}" STREQUAL "ARM")
-    test_target_arch(arm "")
   endif()
+  test_target_arch(arm "-march=armv7")
 endif()
 
 # We support running instrumented tests when we're not cross compiling
@@ -354,7 +353,7 @@
 filter_available_targets(MSAN_SUPPORTED_ARCH x86_64)
 filter_available_targets(PROFILE_SUPPORTED_ARCH x86_64 i386 arm)
 filter_available_targets(TSAN_SUPPORTED_ARCH x86_64)
-filter_available_targets(UBSAN_SUPPORTED_ARCH x86_64 i386)
+filter_available_targets(UBSAN_SUPPORTED_ARCH x86_64 i386 arm)
 
 add_subdirectory(include)
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