#!/bin/sh

bup_find_prog()
{
    # Prints prog path to stdout or nothing.
    local name="$1" result="$2"
    TLOGN "checking for $name"
    if ! [ "$result" ]; then
        result=`acLookFor "$name"`
    fi
    TLOG " ($result)"
    echo "$result"
}

TARGET=bup

. ./configure.inc

AC_INIT $TARGET

if ! AC_PROG_CC; then
    LOG " You need to have a functional C compiler to build $TARGET"
    exit 1
fi

MAKE="$(bup_find_prog make $MAKE)"
if test -z "$MAKE"; then
    MAKE="$(bup_find_prog gmake "$GMAKE")"
fi

if test -z "$MAKE"; then
    AC_FAIL "ERROR: unable to find make"
fi

if ! ($MAKE --version | grep "GNU Make"); then
    AC_FAIL "ERROR: $MAKE is not GNU Make"
fi

MAKE_VERSION=`$MAKE --version | grep "GNU Make" | awk '{print $3}'`
if [ -z "$MAKE_VERSION" ]; then
    AC_FAIL "ERROR: $MAKE --version does not return sensible output?"
fi
expr "$MAKE_VERSION" '>=' '3.81' || AC_FAIL "ERROR: $MAKE must be >= version 3.81"

if test -z "$(bup_find_prog python '')"; then
    AC_FAIL "ERROR: unable to find python"
fi

if test -z "$(bup_find_prog git '')"; then
    AC_FAIL "ERROR: unable to find git"
fi

# For stat.
AC_CHECK_HEADERS sys/stat.h
AC_CHECK_HEADERS sys/types.h
AC_CHECK_HEADERS unistd.h

# For FS_IOC_GETFLAGS and FS_IOC_SETFLAGS.
AC_CHECK_HEADERS linux/fs.h
AC_CHECK_HEADERS sys/ioctl.h

# On GNU/kFreeBSD utimensat is defined in GNU libc, but won't work.
if [ -z "$OS_GNU_KFREEBSD" ]; then
    AC_CHECK_FUNCS utimensat
fi
AC_CHECK_FUNCS utimes
AC_CHECK_FUNCS lutimes

AC_CHECK_FIELD stat st_atim sys/types.h sys/stat.h unistd.h
AC_CHECK_FIELD stat st_mtim sys/types.h sys/stat.h unistd.h
AC_CHECK_FIELD stat st_ctim sys/types.h sys/stat.h unistd.h

AC_CHECK_FIELD stat st_atimensec sys/types.h sys/stat.h unistd.h
AC_CHECK_FIELD stat st_mtimensec sys/types.h sys/stat.h unistd.h
AC_CHECK_FIELD stat st_ctimensec sys/types.h sys/stat.h unistd.h

AC_OUTPUT config.vars