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auto merge of #17129 : epdtry/rust/misc/llvm-root-reconfig, r=brson 

Currently `./configure --llvm-root=...` and similar flags will break incremental builds by forcing reconfiguration on every `make`.  This happens because `reconfig.mk` incorrectly treats submodules in the `-` (uninitialized) state as requiring reconfiguration, and `./configure` deliberately deinitializes unneeded submodules.  The fix is to reconfigure only when submodules are in the `+` state (wrong commit checked out).
This commit is contained in:
bors 2014-09-10 14:20:37 +00:00
parent 4049a4da79 ba43f7bc8c
commit 6faa4f33a4
1 changed files with 5 additions and 1 deletions
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6
mk/reconfig.mk
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@ -15,7 +15,11 @@ rwildcard=$(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) \
ifndef CFG_DISABLE_MANAGE_SUBMODULES
# This is a pretty expensive operation but I don't see any way to avoid it
NEED_GIT_RECONFIG=$(shell cd "$(CFG_SRC_DIR)" && "$(CFG_GIT)" submodule status | grep -c '^\(+\|-\)')
# NB: This only looks for '+' status (wrong commit checked out), not '-' status
# (nothing checked out at all). `./configure --{llvm,jemalloc,libuv}-root`
# will explicitly deinitialize the corresponding submodules, and we don't
# want to force constant rebuilds in that case.
NEED_GIT_RECONFIG=$(shell cd "$(CFG_SRC_DIR)" && "$(CFG_GIT)" submodule status | grep -c '^+')
else
NEED_GIT_RECONFIG=0
endif