buildroot

Add an implementation of the fts_*() functions

​

The fts_*() functions are optional in uClibc, and not compiled in our

default configuration. The best option would be to migrate this

elfutils code to the nftw family of functions, but it requires quite

some work.

​

So we have several options here:

​

 *) Enable fts_*() functions in our default uClibc configuration. Not

    nice since only one package needs them (the help text of uClibc

    for fts_*() functions explicitly mention that they have been added

    to be able to build elfutils).

​

 *) Use gnulib, but it is quite heavy to setup, requires modifications

    to configure.ac, and other things.

​

 *) Copy the fts function from uClibc into elfutils source code. This

    is the solution used below. uClibc is LGPL, and elfutils is

    LGPL/GPL, so there should not be any licensing issue.

​

Of course, the fts_*() functions are only built if they are not

already provided by the C library.

​

Based on the former patch by Thomas Petazzoni.

​

[Vincent: tweak patch for 0.166]

​

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

​

diff -Nrup a/configure.ac b/configure.ac

--- a/configure.ac  2016-06-17 14:47:03.561704498 +0100

+++ b/configure.ac  2016-06-17 14:52:35.038200412 +0100

@@ -259,6 +259,10 @@ AC_ARG_ENABLE([progs],

    enable_progs=yes)

 AM_CONDITIONAL(ENABLE_PROGS, test "$enable_progs" = yes)

+AC_CHECK_HEADER([fts.h],

+   AC_DEFINE([HAVE_FTS_H], [], [Define if <fts.h> is available in C library]))

+AM_CONDITIONAL(HAVE_FTS, test "$ac_cv_header_fts_h" = yes)

+

 dnl zlib is mandatory.

 save_LIBS="$LIBS"

 LIBS=

diff -Nrup a/libdwfl/fts.c b/libdwfl/fts.c

--- a/libdwfl/fts.c 1970-01-01 01:00:00.000000000 +0100

+++ b/libdwfl/fts.c 2016-06-17 14:57:26.649912084 +0100

@@ -0,0 +1,1095 @@

+/*-

+ * Copyright (c) 1990, 1993, 1994

+ * The Regents of the University of California.  All rights reserved.

+ *

+ * Redistribution and use in source and binary forms, with or without

+ * modification, are permitted provided that the following conditions

+ * are met:

+ * 1. Redistributions of source code must retain the above copyright

+ *    notice, this list of conditions and the following disclaimer.

+ * 2. Redistributions in binary form must reproduce the above copyright

+ *    notice, this list of conditions and the following disclaimer in the

+ *    documentation and/or other materials provided with the distribution.

+ * 4. Neither the name of the University nor the names of its contributors

+ *    may be used to endorse or promote products derived from this software