#5004: loading stripped libHsghc-7.0.2.a fails
---------------------------------+------------------------------------------
Reporter: pbrisbin | Owner:
Type: bug | Status: new
Priority: highest | Milestone: 7.2.1
Component: Compiler | Version: 7.0.2
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: Unknown/Multiple | Failure: GHCi crash
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Comment(by twhitehead):
Just finished running into this on Debian. Looks like the problem is that
the ''keepCAFsForGHCi.o'' object file in the archive has no symbols but
debug ones.
That is, taking the post-stripped archive from the packaging directory, we
have
{{{
$ nm libHSghc-7.0.3-poststrip.a > /dev/null
nm: keepCAFsForGHCi.o: no symbols
$ ar -x libHSghc-7.0.3-poststrip.a keepCAFsForGHCi.o
$ nm keepCAFsForGHCi.o
nm: keepCAFsForGHCi.o: no symbols
$ nm -a keepCAFsForGHCi.o
nm: keepCAFsForGHCi.o: no symbols
}}}
compared to the pre-stripped archive from the install directory, which
gives
{{{
$ nm libHSghc-7.0.3.a > /dev/null
$ ar -x libHSghc-7.0.3.a keepCAFsForGHCi.o
$ nm keepCAFsForGHCi.o
$ nm -a
0000000000000000 b .bss
0000000000000000 n .comment
0000000000000000 d .data
0000000000000000 n .note.GNU-stack
0000000000000000 t .text
0000000000000000 a keepCAFsForGHCi.c
$
}}}
(the ''-a'' flag causes ''nm'' to also list debug symbols).
Replacing just ''keepCAFsForGHCi.o'' in the post-stripped archive with
that from the pre-stripped archive is enough to make GHC work again.
I see the associated source file seems to only exist to set the
''keepCAFs'' variable via a ''constructor'' flagged function. As this
variable seems to be local (there is no corresponding undefined symbol),
I'm a bit confused as to what it is suppose to do.
In any event, even if it is still used, this can likely be easily worked
around by simply adding a bogus non-static symbol as well so stripping
won't produce no symbols.
Cheers! -Tyson
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5004#comment:17>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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