[Bug general/21009] New: Incompatible with MUSL libc: canonicalize_file_name

["luizluca at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21009

            Bug ID: 21009
           Summary: Incompatible with MUSL libc: canonicalize_file_name
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: general
          Assignee: unassigned at sourceware dot org
          Reporter: luizluca at gmail dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Hello

From bug 21002:

- Since canonicalize_file_name (path) is defined as realpath(path, NULL) that
change seems fine.

However, there seems to be some limitation on realpath:

https://mail.gnome.org/archives/gtk-devel-list/2002-October/msg00197.html

If autoconf checks for it, we could simply define a macro for it when
canonicalize_file_name is not present like:

#ifndef HAVE_canonicalize_file_name
#define canonicalize_file_name(name) realpath(name,NULL)
#endif

This function is used only at:

./libdwfl/find-debuginfo.c:388
./libdwfl/dwfl_build_id_find_elf.c:98

And both include system.h. So, the best place to conditionally define it might
be system.h.

What's the correct approach? change the call or conditionally define a new
macro?

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