c7a3e1be8
Rob Landley
2005-07-31
Subject
Fix "nm --size-sort" on the busybox binary and document how to make it work.
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Rules.mak+1 -1
| @@ -169,7 +169,7 @@ ifeq ($(strip $(CONFIG_DEBUG)),y) | |
| STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging | |
| else | |
| CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG | |
| - | LDFLAGS += -s -Wl,-warn-common |
| + | LDFLAGS += -Wl,-warn-common |
| STRIPCMD:=$(STRIP) --remove-section=.note --remove-section=.comment | |
| endif | |
| ifeq ($(strip $(CONFIG_STATIC)),y) | |
docs/busybox.net/FAQ.html+26 -61
| @@ -246,68 +246,33 @@ have additions to this FAQ document, we would love to add them, | |
| trust PayPal... | |
| <hr /> | |
| + | <p> |
| + | <h2><a name="optimize">I want to make busybox even smaller, how do I go about it?</a></h2> |
| + | <p> |
| + | To conserve bytes it's good to know where they're being used, and the |
| + | size of the final executable isn't always a reliable indicator of |
| + | the size of the components (since various structures are rounded up, |
| + | so a small change may not even be visible by itself, but many small |
| + | savings add up). |
| + | </p> |
| + | <p> |
| + | To examine a busybox binary with an eye to saving bytes, build an |
| + | optimized debug version and run the "nm" command against it, like so: |
| + | </p> |
| + | <p> |
| + | make clean && make STRIPCMD=/bin/true && nm --size-sort busybox |
| + | </p> |
| + | <p> |
| + | This gives a list of symbols and the amount of space allocated for |
| + | each one, sorted by size. (Note: do not enable CONFIG_DEBUG for this, |
| + | as that disables compiler optimization which is great for running gdb |
| + | but misleading when trying to figure out how much space each component |
| + | is really using under normal circumstances.) |
| + | </p> |
| + | <hr /> |
| + | |
| + | |
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