#! /bin/sh
# Copyright (C) 2011  Free Software Foundation, Inc.
#
# 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, 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, see <http://www.gnu.org/licenses/>.

# Check interactions between the `portability' and `extra-portability'
# warning categories:
#   1. `-Wextra-portability' must imply `-Wportability'.
#   2. `-Wno-portability' must imply `-Wno-extra-portability'.
#   3. `-Wall' does *not* imply `-Wextra-portability'.

. ./defs || Exit 1

set -e

# We want (almost) complete control over automake options.
# FIXME: use $original_AUTOMAKE here once we are merged into master.
AUTOMAKE="`(set $AUTOMAKE && echo $1)` --foreign -Werror"

cat >>configure.in <<END
AC_PROG_CC
AC_PROG_RANLIB
AC_OUTPUT
END

$ACLOCAL

#
# First, a setup where only an extra-portability warning is present
# (no "simple" portability-warnings are).
#

cat >Makefile.am <<END
EXTRA_LIBRARIES = libfoo.a
libfoo_a_SOURCES = sub/foo.c
END

# Sanity check: extra-portability warnings causes the expected error.
AUTOMAKE_fails -Wextra-portability
grep 'requires.*AM_PROG_AR' stderr

# Warnings in extra-portability category are not enabled by default.
$AUTOMAKE

# `-Wall' does not enable extra-portability warnings.
$AUTOMAKE -Wall -Werror

# Enabling extra-portability works.
AUTOMAKE_fails -Wnone -Wextra-portability
grep 'requires.*AM_PROG_AR' stderr
# Disabling portability disables extra-portability.
$AUTOMAKE -Wno-portability -Wall
$AUTOMAKE -Wextra-portability -Wno-portability -Wall

echo libfoo_a_CPPFLAGS = -Dwhatever >> Makefile.am

# Enabling extra-portability enables portability.
AUTOMAKE_fails -Wnone -Wextra-portability
# The expected diagnostic is
#    Makefile.am:2: compiling `foo.c' with per-target flags requires `AM_PROG_CC_C_O' in `configure.in'
#    .../lib/am/library.am: `libfoo.a': linking libraries using a non-POSIX
#    .../lib/am/library.am: archiver requires `AM_PROG_AR' in `configure.in'
#    Makefile.am:1:   while processing library `libfoo.a'
grep 'requires.*AM_PROG_CC_C_O' stderr
grep 'requires.*AM_PROG_AR' stderr

# `-Wall' does not reset extra portability warnings to their
# default (i.e., disabled).
AUTOMAKE_fails -Wextra-portability -Wall
grep 'requires.*AM_PROG_CC_C_O' stderr
grep 'requires.*AM_PROG_AR' stderr

# Disabling extra-portability leaves portability intact.
AUTOMAKE_fails -Wportability -Wno-extra-portability
grep 'requires.*AM_PROG_CC_C_O' stderr
grep 'requires.*AM_PROG_AR' stderr && Exit 1

# `-Wall' does not set extra portability warnings if they have
# been previously disabled.
AUTOMAKE_fails -Wno-extra-portability -Wall
grep 'requires.*AM_PROG_CC_C_O' stderr
grep 'requires.*AM_PROG_AR' stderr && Exit 1

# Enabling portability does not enable extra-portability.
AUTOMAKE_fails -Wnone -Wportability
grep 'requires.*AM_PROG_CC_C_O' stderr
grep 'requires.*AM_PROG_AR' stderr && Exit 1

# Disabling portability disables extra-portability.
$AUTOMAKE -Wno-portability
$AUTOMAKE -Wextra-portability -Wno-portability
$AUTOMAKE -Wall -Wno-portability

: