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Provide option to have APE not modify itself

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This change introduces ape-no-modify-self.o to the amalgamated release
binaries, which may be used as an alternative to ape.o to make it easier
to use APE in cases where the self-modifying behavior isn't acceptable.

Please note that this alternative copying behavior isn't necessarily
better. It introduces a whole bunch of questions of its own, which are
documented in the ape.S source comment and should be considered by both
the program author as well as the end-user of programs linked this way.

For example, build environments that use read-only file systems and
would prefer to not have a launcher wrapper (like we use in our build)
can use ape-no-modify-self.o instead of ape.o and then set the $TMPDIR
environment variable to point to a sane read-write-exec location.

Fixes #146
See #82
This commit is contained in:
Justine Tunney 2021-04-07 21:01:57 -07:00
parent 59575f7e80
commit da8a08fd58
3 changed files with 77 additions and 6 deletions
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7
ape/ape.mk
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@ -46,5 +46,10 @@ o/ape/idata.inc: \
$(APE_OBJS): $(BUILD_FILES) \
ape/ape.mk
o/$(MODE)/ape/ape-no-modify-self.o: ape/ape.S
@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -DAPE_NO_MODIFY_SELF $<
.PHONY: o/$(MODE)/ape
o/$(MODE)/ape: $(APE) $(APE_CHECKS)
o/$(MODE)/ape: $(APE) \
$(APE_CHECKS) \
o/$(MODE)/ape/ape-no-modify-self.o