[Bug guile/19149] New: Message when guile is required but not available is not clear

["yuri at tsoft dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19149

            Bug ID: 19149
           Summary: Message when guile is required but not available  is
                    not clear
           Product: gdb
           Version: 7.10
            Status: NEW
          Severity: normal
          Priority: P2
         Component: guile
          Assignee: unassigned at sourceware dot org
          Reporter: yuri at tsoft dot com
  Target Milestone: ---

I have gdb-7.10 built without the GUILE option (which is the default) on
FreeBSD. Qt4 project (.pro) automatically runs the following command that
fails:

> $ gdb --nx --batch --quiet -ex 'set confirm off' -ex "save gdb-index $DESTDIR" -ex quit 'xxx'
> Exception caught while booting Guile.
> Error in function "open-file":
> No such file or directory: "/usr/local/share/gdb710/guile/gdb/boot.scm"
> gdb: warning: Could not complete Guile gdb module initialization from:
> /usr/local/share/gdb710/guile/gdb/boot.scm.
> Limited Guile support is available.
> Suggest passing --data-directory=/path/to/gdb/data-directory.
> usage: save gdb-index DIRECTORY


gdb error message should say: "guile is required for the operation <whatever>,
but gdb hasn't been built with guile support. Please choose an option
--with-guile to build gdb with guile support."

People have to deal with a lot of interacting systems, that is why error
message should be as clear and informative as possible.

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