#9186: GHC panic when compiling compdata -------------------------------------+------------------------------------- Reporter: snoyberg | Owner: simonmar Type: bug | Status: new Priority: high | Milestone: 7.10.1 Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: #8935 Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by trommler): Replying to [comment:24 trommler]:
I rebased the patch for #8935 and cannot reproduce the issue for compdata version 0.8.1.0 and 0.9. I also built Haskell Platform [https://build.opensuse.org/project/show/devel:languages:haskell:platform] and pandoc [https://build.opensuse.org/project/show/devel:languages:haskell:pandoc] on OBS and did not see the issue. Setting environment variable `SUSE_ASNEEDED=1` I can reproduce the bug. That environment variable changes the behaviour of the link editor to include the flag `--as-neeeded` in the link command.
From man ld(1): --as-needed --no-as-needed This option affects ELF DT_NEEDED tags for dynamic libraries mentioned on the command line after the --as-needed option. Normally the linker will add a DT_NEEDED tag for each dynamic library mentioned on the command line, regardless of whether the library is actually needed or not. --as-needed causes a DT_NEEDED tag to only be emitted for a library that satisfies an undefined symbol reference from a regular object file or, if the library is not found in the DT_NEEDED lists of other libraries linked up to that point, an undefined symbol reference from another dynamic library. --no-as-needed restores the default behaviour. The important point here is: The order of the linker arguments does matter! I do not understand, however, what adding -v3 changes (see [comment:13 @rwbarton's comment]) to make the build go through. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9186#comment:26 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler