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make use of snapshot runtime predicated on variable USE_SNAPSHOT_RUNTIME

This commit is contained in:
Niko Matsakis 2012-01-09 14:08:08 -08:00
parent 55edb4a04f
commit 005e319485
1 changed files with 31 additions and 10 deletions
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41
mk/target.mk
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@ -4,6 +4,11 @@
# $(2) is the target triple
# $(3) is the host triple
# If you are making non-backwards compatible changes to the runtime,
# set this flag to 1. It will cause stage1 to use the snapshot
# runtime rather than the runtime from the working directory.
USE_SNAPSHOT_RUNTIME=0
define TARGET_STAGE_N
$$(TLIB$(1)_T_$(2)_H_$(3))/intrinsics.ll: \
@ -58,11 +63,17 @@ $$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBRUSTC): \
endef
# The stage0 (snapshot) compiler produces binaries that expect the
# snapshot runtime. Therefore, the stage1 compiler and libraries
# (which are produced by stage0) should use the runtime from the
# snapshot. The stage2 compiler and libraries (which are produced by
# stage1) will be the first that are expecting to run against the
# runtime as defined in the working directory.
# snapshot runtime. Normally the working directory runtime and
# snapshot runtime are compatible, so this is no problem. But
# sometimes we want to make non-backwards-compatible changes. In
# those cases, the stage1 compiler and libraries (which are produced
# by stage0) should use the runtime from the snapshot. The stage2
# compiler and libraries (which are produced by stage1) will be the
# first that are expecting to run against the runtime as defined in
# the working directory.
#
# The catch is that you may not add new functions to the runtime
# in this case!
#
# Arguments are the same as for TARGET_BASE_STAGE_N
define TARGET_RT_FROM_SNAPSHOT
@ -96,15 +107,25 @@ $(foreach source,$(CFG_TARGET_TRIPLES), \
$(eval $(call TARGET_STAGE_N,2,$(target),$(source))) \
$(eval $(call TARGET_STAGE_N,3,$(target),$(source)))))
$(eval $(call TARGET_RT_FROM_SNAPSHOT,0,$(CFG_HOST_TRIPLE),$(CFG_HOST_TRIPLE)))
# Host triple either uses the snapshot runtime or runtime from
# working directory, depending on the USE_SNAPSHOT_RUNTIME var.
ifeq ($(USE_SNAPSHOT_RUNTIME),1)
$(foreach src,$(CFG_HOST_TRIPLE),\
$(eval $(call TARGET_RT_FROM_SNAPSHOT,0,$(src),$(src))))
else
$(foreach src,$(CFG_HOST_TRIPLE),\
$(eval $(call TARGET_RT_FROM_WD,0,$(src),$(src))))
endif
# Non-host triples build the stage0 runtime from the working directory
$(foreach source,$(CFG_TARGET_TRIPLES), \
$(foreach target,$(NON_HOST_TRIPLES), \
$(eval $(call TARGET_RT_FROM_WD,0,$(target),$(source)))))
# After stage0, always build the stage0 runtime from the working directory
$(foreach source,$(CFG_TARGET_TRIPLES), \
$(foreach target,$(CFG_TARGET_TRIPLES), \
$(eval $(call TARGET_RT_FROM_WD,1,$(target),$(source))) \
$(eval $(call TARGET_RT_FROM_WD,2,$(target),$(source))) \
$(eval $(call TARGET_RT_FROM_WD,3,$(target),$(source)))))
# Non-host triples build the stage0 runtime from the working directory
$(foreach source,$(CFG_TARGET_TRIPLES), \
$(foreach target,$(NON_HOST_TRIPLES), \
$(eval $(call TARGET_RT_FROM_WD,0,$(target),$(source)))))