message: Add the target triple & sdk for swift test cases when building for ios.
diff: # FRAMEWORK_INCLUDES (Darwin only) :=
  # CFLAGS_EXTRAS :=
  # LD_EXTRAS :=
  +# SWIFTFLAGS_EXTRAS :=
  # SPLIT_DEBUG_SYMBOLS := YES
  # CROSS_COMPILE :=
  #
  @@ -61,8 +62,10 @@ ifneq "$(TRIPLE)" ""
  triple_os_and_version =$(shell echo $(word 3, $(triple_space)) | sed 's/\([a-z]*\)\(.*\)/\1 \2/')
  TRIPLE_OS =$(word 1, $(triple_os_and_version))
  TRIPLE_VERSION =$(word 2, $(triple_os_and_version))
  + TRIPLE_SWIFTFLAGS :=-target $(TRIPLE)
  ifeq "$(TRIPLE_VENDOR)" "apple"
  ifeq "$(TRIPLE_OS)" "ios"
  + # Provide a reasonable SDKROOT if not specified.
  ifeq "$(SDKROOT)" ""
  # Set SDKROOT if it wasn't set
  ifneq (,$(findstring arm,$(ARCH)))
  @@ -79,6 +82,8 @@ ifneq "$(TRIPLE)" ""
  TRIPLE_SWIFTFLAGS :=-target $(TRIPLE) -sdk "$(SDKROOT)"
  ARCH_CFLAGS :=-mios-simulator-version-min=$(TRIPLE_VERSION) -isysroot "$(SDKROOT)"
  endif
  + # Add in the SDKROOT to the swift flags.
  + TRIPLE_SWIFTFLAGS +=-sdk "$(SDKROOT)"
  endif
  endif
  ifeq "$(TRIPLE_OS)" "watchos"
  @@ -281,6 +286,7 @@ endif
  CFLAGS += -I$(SRCDIR) -include $(THIS_FILE_DIR)test_common.h -I$(THIS_FILE_DIR)
  CFLAGS += $(NO_LIMIT_DEBUG_INFO_FLAGS) $(ARCH_CFLAGS) $(CFLAGS_EXTRAS)
  SWIFTFLAGS += $(TRIPLE_SWIFTFLAGS)
  +SWIFTFLAGS += $(SWIFTFLAGS_EXTRAS)
  # Use this one if you want to build one part of the result without debug information:
  ifeq "$(OS)" "Darwin"
  