AC_INIT(btpd, 0.13+, btpd@murmeldjur.se)

AM_INIT_AUTOMAKE([foreign subdir-objects])

AC_CONFIG_FILES([Makefile])

AC_PROG_CC
AC_PROG_CC_C_O
AC_PROG_RANLIB
AC_USE_SYSTEM_EXTENSIONS

AC_ARG_WITH(openssl,
[  --with-openssl=dir      use openssl installed in dir],
[
    AC_SUBST(openssl_LDFLAGS,["-L${withval}/lib -Wl,-R,${withval}/lib"])
    AC_SUBST(openssl_CPPFLAGS,"-I${withval}/include")
])

AC_ARG_WITH(evloop-method,
[  --with-evloop-method    select evloop method (epoll,poll,kqueue)],
    evloop_methods=$withval,
    evloop_methods="epoll kqueue poll")

old_LIBS=$LIBS
LIBS=""
AC_SEARCH_LIBS(clock_gettime, rt,,AC_MSG_FAILURE(btpd needs clock_gettime))
AC_SUBST(CLOCKLIB,$LIBS)
LIBS=""
AC_SEARCH_LIBS(inet_ntop, nsl,,AC_MSG_FAILURE(btpd needs inet_ntop))
AC_SEARCH_LIBS(bind, socket,,AC_MSG_FAILURE(btpd needs bind))
AC_SUBST(INETLIBS,$LIBS)
LIBS=$old_LIBS
AC_CHECK_FUNCS(asprintf)

AC_MSG_CHECKING(whether compiler accepts -Wno-pointer-sign)
old_CFLAGS=$CFLAGS
CFLAGS="-Wno-pointer-sign"
AC_COMPILE_IFELSE(int main(void) { return 0; },
    AC_SUBST(WARNNPS,"-Wno-pointer-sign")
    AC_MSG_RESULT(yes)
,
    AC_MSG_RESULT(no))
CFLAGS=$old_CFLAGS

old_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $openssl_LDFLAGS"
AC_CHECK_LIB(crypto, SHA1_Final,:,AC_MSG_FAILURE(btpd needs openssl's libraries and headers))
LDFLAGS=$old_LDFLAGS

for m in $evloop_methods; do
    case $m in
    epoll)
        AC_CHECK_FUNC(epoll_wait,[
            AC_SUBST(EVLOOP_IMPL,"evloop/epoll.${OBJEXT}")
            AC_SUBST(EVLOOP_METHOD,EVLOOP_EPOLL)
            break])
        ;;
    kqueue)
        AC_CHECK_FUNC(kqueue,[
            AC_SUBST(EVLOOP_IMPL,"evloop/kqueue.${OBJEXT}")
            AC_SUBST(EVLOOP_METHOD,EVLOOP_KQUEUE)
            break])
        ;;
    poll)
        AC_CHECK_FUNC(poll,[
            AC_SUBST(EVLOOP_IMPL,"evloop/poll.${OBJEXT}")
            AC_SUBST(EVLOOP_METHOD,EVLOOP_POLL)
            break])
        break
        ;;
    *)
        AC_MSG_ERROR($m is not a valid evloop method)
        exit 1
        ;;
    esac
done
if test x$EVLOOP_METHOD == x; then
    AC_MSG_FAILURE(no suitable evloop method found)
    exit 1
else
    AC_MSG_NOTICE(selected evloop method $EVLOOP_METHOD)
fi

for i in 0 1 2 3 4 5 6; do
    case $i in
    0) if test x$TD_CFLAGS$TD_LIBS == x; then continue; fi;;
    1) TD_CFLAGS=-pthread;;
    2) TD_CFLAGS=-pthreads;;
    3) TD_CFLAGS=-kthread;;
    4) TD_CFLAGS=-mt;;
    5) TD_LIBS=-lpthread;;
    6) AC_MSG_FAILURE(how do you build with pthreads on this system?);;
    esac
    old_CFLAGS=$CFLAGS; CFLAGS="$TD_CFLAGS $CFLAGS"
    old_LIBS=$LIBS; LIBS="$TD_LIBS $LIBS"
    AC_MSG_CHECKING(whether pthreads compiles with flags \"$TD_CFLAGS $TD_LIBS\")
    AC_LANG_CONFTEST([int foo(void) { return 12; }])
    $CC $CFLAGS $CPPFLAGS -c conftest.c >conftest.stdout 2>conftest.stderr
    if test -s conftest.stdout -o -s conftest.stderr; then
        AC_MSG_RESULT(no)
        TD_CFLAGS=""; TD_LIBS=""
        CFLAGS=$old_CFLAGS; LIBS=$old_LIBS
        rm -f conftest.c conftest.o conftest.stdout conftest.stderr
        continue
    fi
    rm -f conftest.c conftest.o conftest.stdout conftest.stderr

    AC_LINK_IFELSE([
        #include <pthread.h>
        int main(void) { return pthread_create(0,0,0,0);}
    ], [
        AC_MSG_RESULT(yes)
        CFLAGS=$old_CFLAGS; LIBS=$old_LIBS
        break
    ], [
        AC_MSG_RESULT(no)
        TD_CFLAGS=""; TD_LIBS=""
        CFLAGS=$old_CFLAGS; LIBS=$old_LIBS
    ])
done
AC_SUBST(TD_CFLAGS)
AC_SUBST(TD_LIBS)

AC_OUTPUT