# Configuration for Linux on ARM.
# Included by combo/select.make
+# You can set TARGET_ARCH_VARIANT to use an arch version other
+# than ARMv5TE. Each value should correspond to a file named
+# $(BUILD_COMBOS)/arch/<name>.mk which must contain
+# makefile variable definitions similar to the preprocessor
+# defines in system/core/include/arch/<combo>/AndroidConfig.h. Their
+# purpose is to allow module Android.mk files to selectively compile
+# different versions of code based upon the funtionality and
+# instructions available in a given architecture version.
+#
+# The blocks also define specific arch_variant_cflags, which
+# include defines, and compiler settings for the given architecture
+# version.
+#
+ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
+TARGET_ARCH_VARIANT := armv5te
+endif
+
+# TARGET_ARCH_VARIANT used to be called TARGET_ARCH_VERSION
+# to avoid any weirdness, issue an error message if the latter
+# is defined.
+#
+ifneq ($(strip $(TARGET_ARCH_VERSION)),)
+$(info Definition for TARGET_ARCH_VERSION encountered !)
+$(info This variable has been renamed TARGET_ARCH_VARIANT, please update your build files !!)
+$(error Aborting the build.)
+endif
+
+TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT).mk
+ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
+$(error Unknown ARM architecture version: $(TARGET_ARCH_VARIANT))
+endif
+
+include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
+
# You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
ifeq ($(strip $($(combo_target)TOOLS_PREFIX)),)
$(combo_target)TOOLS_PREFIX := \
- prebuilt/$(HOST_PREBUILT_TAG)/toolchain/arm-eabi-4.2.1/bin/arm-eabi-
+ prebuilt/$(HOST_PREBUILT_TAG)/toolchain/arm-eabi-4.4.0/bin/arm-eabi-
endif
$(combo_target)CC := $($(combo_target)TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
-funswitch-loops \
-finline-limit=300
+# Modules can choose to compile some source as thumb. As
+# non-thumb enabled targets are supported, this is treated
+# as a 'hint'. If thumb is not enabled, these files are just
+# compiled as ARM.
+ifeq ($(ARCH_ARM_HAVE_THUMB_SUPPORT),true)
TARGET_thumb_CFLAGS := -mthumb \
-Os \
-fomit-frame-pointer \
-fno-strict-aliasing \
-finline-limit=64
+else
+TARGET_thumb_CFLAGS := $(TARGET_arm_CFLAGS)
+endif
# Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk
# or in your environment to force a full arm build, even for
# with -mlong-calls. When built at -O0, those libraries are
# too big for a thumb "BL <label>" to go from one end to the other.
ifeq ($(FORCE_ARM_DEBUGGING),true)
- TARGET_arm_CFLAGS += -fno-omit-frame-pointer
+ TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
endif
-## on some hosts, the target cross-compiler is not available so do not run this command
-ifneq ($(wildcard $($(combo_target)CC)),)
-$(combo_target)LIBGCC := $(shell $($(combo_target)CC) -mthumb-interwork -print-libgcc-file-name)
-endif
+android_config_h := $(call select-android-config-h,linux-arm)
+arch_include_dir := $(dir $(android_config_h))
$(combo_target)GLOBAL_CFLAGS += \
- -march=armv5te -mtune=xscale \
-msoft-float -fpic \
- -mthumb-interwork \
-ffunction-sections \
-funwind-tables \
-fstack-protector \
-fno-short-enums \
- -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ \
- -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ \
- -include $(call select-android-config-h,linux-arm)
+ $(arch_variant_cflags) \
+ -include $(android_config_h) \
+ -I $(arch_include_dir)
+
+$(combo_target)GLOBAL_LDFLAGS += \
+ $(arch_variant_ldflags)
+
+# We only need thumb interworking in cases where thumb support
+# is available in the architecture, and just to be sure, (and
+# since sometimes thumb-interwork appears to be default), we
+# specifically disable when thumb support is unavailable.
+ifeq ($(ARCH_ARM_HAVE_THUMB_SUPPORT),true)
+$(combo_target)GLOBAL_CFLAGS += -mthumb-interwork
+else
+$(combo_target)GLOBAL_CFLAGS += -mno-thumb-interwork
+endif
$(combo_target)GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden
libstdc++_root := bionic/libstdc++
libthread_db_root := bionic/libthread_db
+
+## on some hosts, the target cross-compiler is not available so do not run this command
+ifneq ($(wildcard $($(combo_target)CC)),)
+# We compile with the global cflags to ensure that
+# any flags which affect libgcc are correctly taken
+# into account.
+$(combo_target)LIBGCC := $(shell $($(combo_target)CC) $($(combo_target)GLOBAL_CFLAGS) -print-libgcc-file-name)
+endif
+
# unless CUSTOM_KERNEL_HEADERS is defined, we're going to use
# symlinks located in out/ to point to the appropriate kernel
# headers. see 'config/kernel_headers.make' for more details
$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
-o $@ \
$(PRIVATE_LDFLAGS) \
+ $(TARGET_GLOBAL_LDFLAGS) \
$(TARGET_LIBGCC)
endef
$(PRIVATE_ALL_OBJECTS) \
$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
$(PRIVATE_LDFLAGS) \
+ $(TARGET_GLOBAL_LDFLAGS) \
$(TARGET_LIBGCC) \
$(TARGET_CRTEND_O)
endef
$(TARGET_GLOBAL_LD_DIRS) \
$(TARGET_CRTBEGIN_STATIC_O) \
$(PRIVATE_LDFLAGS) \
+ $(TARGET_GLOBAL_LDFLAGS) \
$(PRIVATE_ALL_OBJECTS) \
$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
$(TARGET_LIBGCC) \
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