#
# $Id: hdrs.in,v 1.23 2004/05/14 16:43:09 jmmv Exp $
# Header checks
#
# buildtool
# Copyright (c) 2002, 2003, 2004 Julio M. Merino Vidal.
#
# 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.
# 3. Neither the name of the author nor the names of contributors may
#    be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

# --------------------------------------------------------------------
# Generic header checks
# --------------------------------------------------------------------

bt_define_ml_check bt_check_hdr

bt_check_hdr_c() { btown_check_hdr c "$@"; }
bt_check_hdr_cxx() { btown_check_hdr cxx "$@"; }

btown_check_hdr() {
    local lang="$1" hdrname="$2"
    local defname=$(bt_def_name BT_HAVE_HDR ${lang} ${hdrname})
    local cachename=$(bt_cache_name BT_HAVE_HDR ${lang} ${hdrname})
    local cv ret
    bt_cache ${cachename}

    bt_msg_chk "for ${lang} header ${hdrname}"

    eval cv=\"\${${cachename}:-unset}\"
    if [ ${cv} = yes ]; then
        bt_define ${defname}
        bt_msg_result "yes (cached)"
        ret=0
    elif [ ${cv} = no ]; then
        bt_msg_result "no (cached)"
        ret=1
    else
        bt_try_compile_${lang} <<EOF
#include <${hdrname}>
int main() { return 0; }
EOF
        ret=$?
        if [ ${ret} -eq 0 ]; then
            eval ${cachename}=yes
            bt_define ${defname}
            bt_msg_result yes
        else
            eval ${cachename}=no
            bt_msg_result no
        fi
    fi

    return ${ret}
}

# --------------------------------------------------------------------
# Specific header checks
# --------------------------------------------------------------------

bt_define_ml_check bt_check_hdr_std

bt_check_hdr_std_c() { btown_check_hdr_std c; }
bt_check_hdr_std_cxx() { btown_check_hdr_std cxx; }

btown_check_hdr_std() {
    local lang=$1

    if bt_check_hdr_${lang} stdio.h; then
        echo "#include <stdio.h>" | bt_try_hdr_append_${lang}
    else
        bt_err "stdio.h not found; compiler is seriously broken"
    fi

    if bt_check_hdr_${lang} sys/types.h; then
        echo "#include <sys/types.h>" | bt_try_hdr_append_${lang}
    fi

    if bt_check_hdr_${lang} sys/stat.h; then
        echo "#include <sys/stat.h>" | bt_try_hdr_append_${lang}
    fi

    if bt_check_hdr_${lang} stdlib.h; then
        echo "#include <stdlib.h>" | bt_try_hdr_append_${lang}
    fi

    if bt_check_hdr_${lang} string.h; then
        echo "#include <string.h>" | bt_try_hdr_append_${lang}
    fi

    if bt_check_hdr_${lang} unistd.h; then
        echo "#include <unistd.h>" | bt_try_hdr_append_${lang}
    fi
}

bt_check_hdr_time() {
    local msg

    if bt_check_hdr sys/time.h; then
        bt_try_hdr_save_${Language}
        echo "#include <sys/time.h>" | bt_try_hdr_append_${Language}

        msg="whether sys/time.h and time.h can be included together"
        if bt_check_hdr time.h; then
            bt_define BT_HDR_SYS_TIME_WITH_TIME
            bt_msg_chk ${msg}
            bt_msg_result yes
        else
            bt_msg_chk ${msg}
            bt_msg_result no
        fi

        bt_try_hdr_restore_${Language}
    fi
}

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