[PATCH compiler_rt] cmake build fix: lib/tsan/dd doesn't pick up the right flags for $arch

[Larry D'Anna]

I encountered this issue trying to build a 32 bit llvm/clang on a 64 bit linux
machine.  I'm not really familiar enough with cmake to know if this is an
appropriate solution, but it works for me!  Please review.  Here's now I set up
my build:

export CC=/home/larry/llvm/native/bin/clang
export CXX=/home/larry/llvm/native/bin/clang++

cmake -G Ninja ~/llvm \
        -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_CROSSCOMPILING=True \
        -DLLVM_TABLEGEN=/home/larry/llvm/native/bin/llvm-tblgen \
        -DCLANG_TABLEGEN=/home/larry/llvm/native/bin/clang-tblgen \
        -DLLVM_DEFAULT_TARGET_TRIPLE=i686-linux-gnu \
        -DLLVM_TARGET_ARCH=X86 \
        -DCMAKE_C_FLAGS='-m32' \
        -DCMAKE_CXX_FLAGS='-m32'
---
 lib/tsan/dd/CMakeLists.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/tsan/dd/CMakeLists.txt b/lib/tsan/dd/CMakeLists.txt
index a21e2dd..1804520 100644
--- a/lib/tsan/dd/CMakeLists.txt
+++ b/lib/tsan/dd/CMakeLists.txt
@@ -35,7 +35,8 @@ if(CAN_TARGET_x86_64 AND UNIX AND NOT APPLE AND NOT ANDROID)
     DEFS ${DD_COMMON_DEFINITIONS})
 
   add_library(RTDD OBJECT ${DD_SOURCES})
-  set_target_compile_flags(RTDD ${DD_CFLAGS})
+  set_target_compile_flags(RTDD ${DD_CFLAGS} ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS})
+
   set_property(TARGET RTDD APPEND PROPERTY
     COMPILE_DEFINITIONS ${DD_COMMON_DEFINITIONS})
   set_property(TARGET RTDD APPEND PROPERTY
@@ -47,6 +48,10 @@ if(CAN_TARGET_x86_64 AND UNIX AND NOT APPLE AND NOT ANDROID)
     $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
     $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>)
   target_link_libraries(clang_rt.dyndd-${arch} pthread dl)
+
+  set_target_link_flags(clang_rt.dyndd-${arch}
+    ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS})
+
 endif()
 
 add_dependencies(compiler-rt dd)
-- 
1.8.3.2