build: remove prelinker build build system
This patch removes support for prelinking from the build system. By now, the
prelinker has outlived its usefulness for several reasons. Firstly, the
speedup that it afforded in the early days of Android is now nullified by the
speed of hardware, as well as by the presence of Zygote. Secondly, the space
savings that come with prelinking (measued at 17MB on a recent honeycomb
stingray build) are no longer important either. Thirdly, prelinking reduces
the effectiveness of Address-Space-Layout Randomization. Finally, since it is
not part of the gcc suite, the prelinker needs to be maintained separately.
The patch deletes apriori, soslim, lsd, isprelinked, and iself from the source
tree. It also removes the prelink map.
LOCAL_PRELINK_MODULE becomes a no-op. Individual Android.mk will get cleaned
separately. Support for prelinking will have to be removed from the recovery
code and from the dynamic loader as well.
Change-Id: I5839c9c25f7772d5183eedfe20ab924f2a7cd411
diff --git a/core/dynamic_binary.mk b/core/dynamic_binary.mk
index 005ccf3..437361a 100644
--- a/core/dynamic_binary.mk
+++ b/core/dynamic_binary.mk
@@ -88,47 +88,9 @@
###########################################################
-## Pre-link
-###########################################################
-prelink_input := $(compress_output)
-# The output of the prelink step is the binary we want to use
-# for symbolic debugging; the prelink step may move sections
-# around, so we have to use this version.
-prelink_output := $(LOCAL_UNSTRIPPED_PATH)/$(LOCAL_BUILT_MODULE_STEM)
-
-# Skip prelinker if it is FDO instrumentation build.
-ifneq ($(strip $(BUILD_FDO_INSTRUMENT)),)
-ifneq ($(LOCAL_NO_FDO_SUPPORT),true)
-LOCAL_PRELINK_MODULE := false
-endif
-endif
-
-ifeq ($(LOCAL_PRELINK_MODULE),true)
-$(prelink_output): $(prelink_input) $(TARGET_PRELINKER_MAP) $(APRIORI)
- $(transform-to-prelinked)
-else
-# Don't prelink the binary, just copy it. We can't skip this step
-# because people always expect a copy of the binary to appear
-# in the UNSTRIPPED directory.
-#
-# If the binary we're copying is acp or a prerequisite,
-# use cp(1) instead.
-ifneq ($(LOCAL_ACP_UNAVAILABLE),true)
-$(prelink_output): $(prelink_input) | $(ACP)
- @echo "target Non-prelinked: $(PRIVATE_MODULE) ($@)"
- $(copy-file-to-target)
-else
-$(prelink_output): $(prelink_input)
- @echo "target Non-prelinked: $(PRIVATE_MODULE) ($@)"
- $(copy-file-to-target-with-cp)
-endif
-endif
-
-
-###########################################################
## Strip
###########################################################
-strip_input := $(prelink_output)
+strip_input := $(compress_output)
strip_output := $(LOCAL_BUILT_MODULE)
ifeq ($(strip $(LOCAL_STRIP_MODULE)),)
@@ -160,5 +122,4 @@
$(cleantarget): PRIVATE_CLEAN_FILES := \
$(PRIVATE_CLEAN_FILES) \
$(linked_module) \
- $(compress_output) \
- $(prelink_output)
+ $(compress_output)