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libgo: only rebuild package if dependent .gox has changed 

Use mvifdiff and stamp files to track whether a .gox file has changed.
    When package A depends on package B, and we rebuild package B, only
    rebuild package A if package B's .gox file changes.  This is safe
    because when package A imports package B it only reads package B's .gox
    file.  This means that changes that do not affect export information
    will not cause dependent packages to be recompiled.
    
    Reviewed-on: https://go-review.googlesource.com/32476

From-SVN: r241742
This commit is contained in:
Ian Lance Taylor 2016-11-01 13:54:21 +00:00
parent 380f39b91b
commit f94a3edc6e
3 changed files with 11 additions and 5 deletions
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2
gcc/go/gofrontend/MERGE
View File

@ -1,4 +1,4 @@
9ee8ad540d6f2f77af1821bfd977dc1820e1be8f
90f12ac1fa72a95e73cb88b6114fa3131c4ca8ee
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

7
libgo/Makefile.am
View File

@ -924,7 +924,8 @@ BUILDPACKAGE = \
# How to build a .gox file from a .lo file.
BUILDGOX = \
f=`echo $< | sed -e 's/.lo$$/.o/'`; \
$(OBJCOPY) -j .go_export $$f $@.tmp && mv -f $@.tmp $@
$(OBJCOPY) -j .go_export $$f $@.tmp; \
$(SHELL) $(srcdir)/mvifdiff.sh $@.tmp `echo $@ | sed -e 's/s-gox/gox/'`
GOTESTFLAGS =
GOBENCH =
@ -1022,8 +1023,10 @@ $(1).lo:
$(1)/check: $$(CHECK_DEPS)
@$$(CHECK)
.PHONY: $(1)/check
$(1).gox: $(1).lo
$(1).gox: $(1).s-gox; @true
$(1).s-gox: $(1).lo
$$(BUILDGOX)
$$(STAMP) $$@
endef
# This line expands PACKAGE_template once for each package name listed

7
libgo/Makefile.in
View File

@ -1079,7 +1079,8 @@ BUILDPACKAGE = \
# How to build a .gox file from a .lo file.
BUILDGOX = \
f=`echo $< | sed -e 's/.lo$$/.o/'`; \
$(OBJCOPY) -j .go_export $$f $@.tmp && mv -f $@.tmp $@
$(OBJCOPY) -j .go_export $$f $@.tmp; \
$(SHELL) $(srcdir)/mvifdiff.sh $@.tmp `echo $@ | sed -e 's/s-gox/gox/'`
GOTESTFLAGS =
GOBENCH =
@ -3366,8 +3367,10 @@ $(1).lo:
$(1)/check: $$(CHECK_DEPS)
@$$(CHECK)
.PHONY: $(1)/check
$(1).gox: $(1).lo
$(1).gox: $(1).s-gox; @true
$(1).s-gox: $(1).lo
$$(BUILDGOX)
$$(STAMP) $$@
endef
# This line expands PACKAGE_template once for each package name listed