Merge "Define a basic llvm-link + clang environment"

TARGET_GLOBAL_CFLAGS += $(TARGET_RELEASE_CFLAGS)

TARGET_GLOBAL_CPPFLAGS += $(TARGET_RELEASE_CPPFLAGS)

# define llvm tools and global flags

include $(BUILD_SYSTEM)/llvm_config.mk

PREBUILT_IS_PRESENT := $(if $(wildcard prebuilt/Android.mk),true)

# ###############################################################

CLANG := $(HOST_OUT_EXECUTABLES)/clang$(HOST_EXECUTABLE_SUFFIX)

LLVM_LINK := $(HOST_OUT_EXECUTABLES)/llvm-link$(HOST_EXECUTABLE_SUFFIX)

define do-clang-flags-subst

  TARGET_GLOBAL_CLANG_FLAGS := $(subst $(1),$(2),$(TARGET_GLOBAL_CLANG_FLAGS))

  HOST_GLOBAL_CLANG_FLAGS := $(subst $(1),$(2),$(HOST_GLOBAL_CLANG_FLAGS))

endef

define clang-flags-subst

  $(eval $(call do-clang-flags-subst,$(1),$(2)))

endef

# These seem to cause warnings on clang/LLVM.

CLANG_CONFIG_UNKNOWN_CFLAGS := \

  -mthumb-interwork \

  -fgcse-after-reload \

  -frerun-cse-after-loop \

  -frename-registers \

  -funswitch-loops \

  -Wa,--noexecstack \

  -mfpu=vfpv3-d16

# Workaround a SIGSEGV in Lol

CLANG_CONFIG_UNKNOWN_CFLAGS += -g

# remove unknown flags to define CLANG_FLAGS

TARGET_GLOBAL_CLANG_FLAGS += $(filter-out $(CLANG_CONFIG_UNKNOWN_CFLAGS),$(TARGET_GLOBAL_CFLAGS))

HOST_GLOBAL_CLANG_FLAGS += $(filter-out $(CLANG_CONFIG_UNKNOWN_CFLAGS),$(HOST_GLOBAL_CFLAGS))

# llvm does not yet support -march=armv5e nor -march=armv5te, fall back to armv5 or armv5t

$(call clang-flags-subst,-march=armv5te,-march=armv5t)

$(call clang-flags-subst,-march=armv5e,-march=armv5)