[Bug ld/26626] Provide a hook to customize missing library error handling

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26626

--- Comment #6 from Nick Clifton <nickc at redhat dot com> ---
Created attachment 12896
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12896&action=edit
Proposed patch

Hi Serge,

  Here is a prototype of a patch to implement this feature.  Would you mind
  giving it a try out please ?

  I made one change to the suggested protocol for the handler, adding a third
  argument when invoking the script.  This extra argument is the name of the
  file that contains the reference to the missing symbol.

  Using the patch and a dummy handler script, I get output like this:

    % gcc -c hello.c
    % ld hello.o -e 0 --error-handling-script=./handler.sh
    missing symbol: hello.o:printf

  There is one caveat however.  Due to an idiosyncrasy of the pex routines
  in the libiberty library, the standard output of the invoked script is
  lost.  (Well it is redirected to a temporary file which is then deleted).
  So in order for the script to produce output that is visible to the user
  text has to be written to stderr.  So for example the handler.sh script
  used above looks like this:

    #!/bin/bash
    echo "missing symbol: $2:$1" >/dev/stderr
    exit 0

  I am using the pex routines for portability to non-unix like environments.

Cheers
  Nick

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