Using strip --strip-debug on archives

[Richard Dawe]

Hello.

While porting GNU MP to DJGPP recently, I found that running 'strip
--strip-debug' on the archive did not behave as I expected. The library
contains multiple objects called init.o from different subdirectories,
which initialise different parts of the library. These are all added to
the library object, libgmp.a. The ar command for this is 'cru'. When I
stripped debug info, I found that only one init.o remained in the library.
I have attached the file "strip2951.txt", which shows the output from
'strip --verbose --strip-debug'.

I tested with the DJGPP ports of binutils 2.8.1 and 2.9.5.1 beta. Both
versions showed the same results (NB: I rebuilt the library between
tests). I can send/place for FTP a copy of the strip & nm output for both
versions, if that would help with my query.

Anyway: My expectation was that strip would leave the object files as they
were and just remove the debug information, i.e. no rearrangement of the
library would take place. Have I hit a limitation/intentional feature?

>From the strip output it appears that it decomposes the library, strips
the object and then reassembles it, which would explain why there is only
one copy of init.o in the stripped version. Since it appears that no path
information is stored in the library, only the object name, I guess it's
not surprising that stripping debug fails using the decompose-recompose
method in this case.

Please CC me on any replies, as I'm not subscribed to the binutils list.

Thanks, bye,

-- 
Richard Dawe
[ mailto:richdawe@bigfoot.com | http://www.bigfoot.com/~richdawe/ ]
GNU strip 2.9.5
Copyright 1997, 1998, 1999 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License.  This program has absolutely no warranty.
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copy from sb_divrem_mn.o(coff-go32) to stbaaaaa/sb_divrem_mn.o(coff-go32)
copy from add.o(coff-go32) to stbaaaaa/add.o(coff-go32)
copy from canonicalize.o(coff-go32) to stbaaaaa/canonicalize.o(coff-go32)
copy from clear.o(coff-go32) to stbaaaaa/clear.o(coff-go32)
copy from cmp.o(coff-go32) to stbaaaaa/cmp.o(coff-go32)
copy from cmp_ui.o(coff-go32) to stbaaaaa/cmp_ui.o(coff-go32)
copy from div.o(coff-go32) to stbaaaaa/div.o(coff-go32)
copy from get_d.o(coff-go32) to stbaaaaa/get_d.o(coff-go32)
copy from get_den.o(coff-go32) to stbaaaaa/get_den.o(coff-go32)
copy from get_num.o(coff-go32) to stbaaaaa/get_num.o(coff-go32)
copy from init.o(coff-go32) to stbaaaaa/init.o(coff-go32)
copy from inv.o(coff-go32) to stbaaaaa/inv.o(coff-go32)
copy from mul.o(coff-go32) to stbaaaaa/mul.o(coff-go32)
copy from neg.o(coff-go32) to stbaaaaa/neg.o(coff-go32)
copy from set.o(coff-go32) to stbaaaaa/set.o(coff-go32)
copy from set_den.o(coff-go32) to stbaaaaa/set_den.o(coff-go32)
copy from set_num.o(coff-go32) to stbaaaaa/set_num.o(coff-go32)
copy from set_si.o(coff-go32) to stbaaaaa/set_si.o(coff-go32)
copy from set_ui.o(coff-go32) to stbaaaaa/set_ui.o(coff-go32)
copy from sub.o(coff-go32) to stbaaaaa/sub.o(coff-go32)
copy from equal.o(coff-go32) to stbaaaaa/equal.o(coff-go32)
copy from set_z.o(coff-go32) to stbaaaaa/set_z.o(coff-go32)
copy from set_d.o(coff-go32) to stbaaaaa/set_d.o(coff-go32)