MIPS: compiler-rt/scudo requires atomic

[wzssyqa]

Summary

On mips, atomic is needed for SCUDO_LINK_LIBS.

[MaskRay]

The target platform instead of the host platform should be tested. We may need something like COMPILER_RT_DEFAULT_TARGET_ARCH.

[glaubitz]

I have created a new revision which works fine for me on mips64el, see: https://reviews.llvm.org/D126418

Let me know whether this is acceptable otherwise I'll close it again. I just want to speed up the review process since the change is trivial enough anyway.

[wzssyqa]

another patches has been accepted.

compiler-rt/lib/scudo/standalone/CMakeLists.txt

 endif()
 
 set(SCUDO_LINK_LIBS)
 
 append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread SCUDO_LINK_FLAGS)
 
 append_list_if(FUCHSIA zircon SCUDO_LINK_LIBS)
 
+if(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "mips" OR
+   CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "mips64" OR
+   CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "mipsel" OR
+   CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "mips64el")
+  list(APPEND SCUDO_LINK_LIBS atomic)
+endif()
+
 if(COMPILER_RT_HAS_SCUDO_STANDALONE)
   add_compiler_rt_object_libraries(RTScudoStandalone
     ARCHS ${SCUDO_STANDALONE_SUPPORTED_ARCH}
     SOURCES ${SCUDO_SOURCES}
     ADDITIONAL_HEADERS ${SCUDO_HEADERS}
     CFLAGS ${SCUDO_CFLAGS})
   add_compiler_rt_object_libraries(RTScudoStandaloneCWrappers
     ARCHS ${SCUDO_STANDALONE_SUPPORTED_ARCH}