#
# Macro based on AC_CHECK_LIB but which takes a particular
# LFLAGS setting as another argument to go into the cache.
#

# AC_CHECK_LIB_FLAGS(LIBRARY, FUNCTION, LDFLAGS,
#                    [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#                    [OTHER-LIBRARIES])
# ------------------------------------------------------
#
# Use a cache variable name containing both the library and function name,
# because the test really is for library $1 defining function $2, not
# just for library $1.  Separate tests with the same $1 and different $2s
# may have different results.
#
# Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])
# is asking for troubles, since AC_CHECK_LIB($lib, fun) would give
# ac_cv_lib_$lib_fun, which is definitely not what was meant.  Hence
# the AS_LITERAL_IF indirection.
#
# FIXME: This macro is extremely suspicious.  It DEFINEs unconditionally,
# whatever the FUNCTION, in addition to not being a *S macro.  Note
# that the cache does depend upon the function we are looking for.
#
# It is on purpose we used `ac_check_lib_save_LIBS' and not just
# `ac_save_LIBS': there are many macros which don't want to see `LIBS'
# changed but still want to use AC_CHECK_LIB, so they save `LIBS'.
# And ``ac_save_LIBS' is too tempting a name, so let's leave them some
# freedom.
AC_DEFUN([AC_CHECK_LIB_FLAGS],
[m4_ifval([$4], , [AH_CHECK_LIB([$1])])dnl
AS_LITERAL_IF([$1],
              [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2_$3])],
              [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2_$3])])dnl
AC_CACHE_CHECK([for $2 in -l$1 with $3], ac_Lib,
[ac_check_lib_save_LIBS=$LIBS
ac_check_lib_save_LDFLAGS=$LDFLAGS
LIBS="-l$1 $6 $LIBS"
LDFLAGS="$3 $LDFLAGS"
AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
               [AS_VAR_SET(ac_Lib, yes)],
               [AS_VAR_SET(ac_Lib, no)])
LIBS=$ac_check_lib_save_LIBS
LDFLAGS=$ac_check_lib_save_LDFLAGS])
AS_IF([test AS_VAR_GET(ac_Lib) = yes],
      [m4_default([$4], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
  LIBS="-l$1 $LIBS"
])],
      [$5])dnl
AS_VAR_POPDEF([ac_Lib])dnl
])# AC_CHECK_LIB