#! /bin/sh

# Fix multilib issue for header files.

# Copyright (C) 2015-2016 Red Hat, Inc.

# Written by Pavel Raiskup <praiskup@redhat.com>

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License along

# with this program; if not, write to the Free Software Foundation, Inc.,

# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# Replace the multilib-unclean file with multilib-clean stub, while the

# original file is moved to unique architecture-specific location.

@LIB@

opt_buildroot=$(pwd)

opt_field_separator=-

# TODO: we could pretty easily implement other then 'cpp-header' stubs, if the

# target file type allows some kind of "transparent" file inclusion.  For

# example shell scripts might use '. "${destdir}/${filename}_x86_64.sh'.

# The solution is taken from Fedora PostgreSQL RPM package.

print_stub ()

{

    # The '#else' branch here is not needed!  We never install this header on

    # systems where this set of '#ifdef's is not enough (adding suggested e.g.

    # in rhbz#1242873).

    # TODO: Shorten the #ifdef hell.  There's no need to have e.g. ifdef for

    # x86_64 in ppc64's wrapper.

    replacement=$filename$opt_field_separator

cat <

/*

 * Kluge to support multilib installation of both 32- and 64-bit RPMS:

 * we need to arrange that header files that appear in both RPMs are

 * identical.  Hence, this file is architecture-independent and calls

 * in an arch-dependent file that will appear in just one RPM.

 *

 * To avoid breaking arches not explicitly supported by Red Hat, we

 * use this indirection file *only* on known multilib arches.

 *

 * We pay attention to include _only_ the original multilib-unclean

 * header file.  Including any other system-header file could cause

 * unpredictable include-ordering issues (rhbz#1412274, comment #16).

 *

 * Note: this may well fail if user tries to use gcc's -I- option.

 * But that option is deprecated anyway.

 */

#if defined(__x86_64__)

#include "${replacement}x86_64.h"

#elif defined(__i386__)

#include "${replacement}i386.h"

#elif defined(__ppc64__) || defined(__powerpc64__)

#include "${replacement}ppc64.h"

#elif defined(__ppc__) || defined(__powerpc__)

#include "${replacement}ppc.h"

#elif defined(__s390x__)

#include "${replacement}s390x.h"

#elif defined(__s390__)

#include "${replacement}s390.h"

#elif defined(__sparc__) && defined(__arch64__)

#include "${replacement}sparc64.h"

#elif defined(__sparc__)

#include "${replacement}sparc.h"

#endif

EOF

}

print_help ()

{

    _h_exit=false

    test -n "$1" && _h_exit=:

    cat <

Usage: $progname [OPTIONS]

Replace the multilib-unclean header file with multilib-clean stub, while the

original file is moved to unique architecture-specific location.  This should be

absolutely safe operation (effects of '#include <HEADER.h>' are unchanged.

To allow us to do incompatible changes in this script, packagers should use this

script only through available RPM macros.

--buildroot     prefix (directory where we play with installed files, usually

                after 'make install DESTDIR=buildroot')

--file          for example /some/path/test.h

--field-separator   by default we move filename.h to filename<SEP><ARCH>.h; this

                option allows you to override the <SEP> part

--verbose       print some useful information

--arch          override arch detection (mostly for testing purposes)

--help          show this help

EOF

    $_h_exit && exit "$1"

}

while test $# -gt 0

do

    _opt=$1 ; shift

    case $_opt in

        --buildroot|--arch|--file|--field-separator)

            _raw_opt=$(echo "$_opt" | sed -e 's/^--//' -e 's/-/_/g')

            eval "opt_$_raw_opt=\$1"

            shift || die "$_opt requires argument"

            ;;

        --help)

            print_help 0

            ;;

        *)

            error "unexpected '$_opt' program argument"

            ;;

    esac

done

$error_occurred && print_help 1

fix_arch opt_arch

for i in arch buildroot file

do

    eval "test -z \"\$opt_$i\"" && error "--$i needs to be set"

done

$error_occurred && print_help 1

# --> /buildroot/usr/include/test.h

original_file="$opt_buildroot$opt_file"

# --> /buildroot/usr/include

destdir=$(dirname "$original_file")

# --> test.h

orig_basename=$(basename "$original_file")

# --> test

filename=${orig_basename%%.[a-zA-Z0-9_]}

# --> .h

suffix=${orig_basename##${filename}}

# --> ../test_x86_64.h (on x86_64)

multilib_file="$destdir/$filename$opt_field_separator$opt_arch$suffix"

test -f "$original_file" || die "can't find '$original_file'"

is_multilib "$opt_arch"  || {

  verbose "we don't need multilib haeder hack for '$opt_arch' architecture (no-op)"

  exit 0

}

verbose "moving: '$original_file' to '$multilib_file'"

mv "$original_file" "$multilib_file" || exit 1

if print_stub > "$original_file" && chmod 644 "$original_file"; then

    :

else

    die "can't write into '$original_file'"

fi

: