dnl -*- mode: Autoconf; -*-

dnl ----------------------------------------------------------------------------
dnl --SECTION--                                                            LIBEV
dnl ----------------------------------------------------------------------------

AC_ARG_WITH(libev,
  AS_HELP_STRING([--with-libev=DIR], [where the libev library and includes are located]),
  [LIBEV_CPPFLAGS="-I$withval/include"
   LIBEV_LDFLAGS="-L$withval/lib"
   LIBEV="$withval"]
)

AC_ARG_WITH(libev-lib,
  AS_HELP_STRING([--with-libev-lib=DIR], [where the libev library is located]),
  [LIBEV_LDFLAGS="-L$withval"]
)

AC_MSG_NOTICE([--------------------------------------------------------------------------------])
AC_MSG_NOTICE([CHECKING FOR LIBEV])
AC_MSG_NOTICE([--------------------------------------------------------------------------------])

dnl ----------------------------------------------------------------------------
dnl checks for the LIBEV library
dnl ----------------------------------------------------------------------------

AC_LANG(C)

if test "x$LIBEV_CPPFLAGS" != x;  then
  TR_INCLUDE([LIBEV_CPPFLAGS])

  LIBEV_CPPFLAGS="$LIBEV_CPPFLAGS -DEV_MINIMAL=0"
fi

dnl ----------------------------------------------------------------------------
dnl save flags
dnl ----------------------------------------------------------------------------

SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $LIBEV_CPPFLAGS"

SAVE_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $LIBEV_LDFLAGS"

SAVE_LIBS="$LIBS"

dnl ----------------------------------------------------------------------------
dnl check for header and library
dnl ----------------------------------------------------------------------------

tr_LIBEV="yes"

AC_CHECK_HEADERS(ev.h, [], [tr_LIBEV="no"])

AC_CHECK_LIB([rt], [clock_gettime], [LIBEV_LIBS="-lrt $LIBEV_LIBS" LIBS="-lrt $LIBS"], [])
AC_CHECK_LIB([m], [floor], [LIBEV_LIBS="-lm $LIBEV_LIBS" LIBS="-lm $LIBS"], [])
AC_CHECK_LIB([ev], [ev_now], [LIBEV_LIBS="-lev $LIBEV_LIBS" tr_LIBEV="yes"], [tr_LIBEV="no"])

if test "x$tr_LIBEV" != xyes;  then
  AC_MSG_ERROR([Please install libev from http://software.schmorp.de/pkg/libev.html])
fi

dnl ----------------------------------------------------------------------------
dnl add substitutions
dnl ----------------------------------------------------------------------------

AC_SUBST(LIBEV_CPPFLAGS)
AC_SUBST(LIBEV_LDFLAGS)
AC_SUBST(LIBEV_LIBS)

dnl ----------------------------------------------------------------------------
dnl grep libev version number
dnl ----------------------------------------------------------------------------

cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */
#include <ev.h>

main () {
  long sdnhg36ed = EV_VERSION_MAJOR EV_VERSION_MINOR ;
}

_ACEOF
AC_MSG_CHECKING([LIBEV version])
eval "$ac_cpp conftest.$ac_ext" | fgrep "long sdnhg36ed" | awk '{print $4 "." $5}' > conftest.output
TRI_LIBEV_VERSION=`cat conftest.output`
AC_MSG_RESULT([$TRI_LIBEV_VERSION])
rm -f conftest*

dnl ----------------------------------------------------------------------------
dnl restore flags
dnl ----------------------------------------------------------------------------

LIBS="$SAVE_LIBS"
LDFLAGS="$SAVE_LDFLAGS"
CPPFLAGS="$SAVE_CPPFLAGS"

LIBEV_CPPFLAGS="${LIBEV_CPPFLAGS} -DTRI_LIBEV_VERSION='\"${TRI_LIBEV_VERSION}\"'"

dnl ----------------------------------------------------------------------------
dnl informational output
dnl ----------------------------------------------------------------------------

LIB_INFO="$LIB_INFO|LIBEV: system version"
LIB_INFO="$LIB_INFO|LIBEV VERSION: ${TRI_LIBEV_VERSION}"

LIB_INFO="$LIB_INFO|LIBEV_CPPFLAGS: ${LIBEV_CPPFLAGS}"
LIB_INFO="$LIB_INFO|LIBEV_LDFLAGS:  ${LIBEV_LDFLAGS}"
LIB_INFO="$LIB_INFO|LIBEV_LIBS:     ${LIBEV_LIBS}"

LIB_INFO="$LIB_INFO|."

dnl ----------------------------------------------------------------------------
dnl --SECTION--                                                      END-OF-FILE
dnl ----------------------------------------------------------------------------

dnl Local Variables:
dnl mode: outline-minor
dnl outline-regexp: "^\\(dnl --SECTION--\\)"
dnl End: