dnl  **************************************************
dnl    Copyright (C) 2004   Matteo Settenvini
dnl  **************************************************

dnl ---------- AX_CHECK_LDFLAG ---------------------
dnl This macro checks if a particular flag for the 
dnl C++ compiler works. If it is so, it adds the flag 
dnl to the CXXFLAGS variable. 
dnl Example of usage : AC_CHECK_LDFLAG([--as-needed])
dnl -------------------------------------------------
AC_DEFUN([AC_CHECK_LDFLAG],
[ AC_REQUIRE([AC_PROG_CC])dnl
  AC_MSG_CHECKING([whether the linker supports the $1 flag])
  ac_check_ldflags=$LDFLAGS
  LDFLAGS="-Wl,$1"
  AC_LANG_PUSH([C])
  AC_LINK_IFELSE(
    AC_LANG_PROGRAM([], [return 0;]),
    [AC_MSG_RESULT([yes])
      LDFLAGS="-Wl,$1 $ac_check_ldflags" ],
    [AC_MSG_RESULT([no])
      LDFLAGS=$ac_check_ldflags ]
  )
  AC_LANG_POP
])dnl ------- AC_CHECK_LDFLAG ----------------------