dune_deprecated_cppflags.m4

dnl -*- autoconf -*-
# Define configure substitution SUBSTITUTION.  Assign value to it but add an
# additional preprocessor define which may be detected by config.h.  Add some
# text to config.h which detects that define and issues the warning in
# message.
#
# DUNE_DEPRECATED_CPPFLAGS(SUBSTITUTION, VALUE, MESSAGE)
AC_DEFUN([DUNE_DEPRECATED_CPPFLAGS],
[
  AH_VERBATIM([DEPRECATED_$1_USED],
[#ifdef DEPRECATED_$1_USED
]dnl Note we have to use a quadrigraph in the following call to m4_text_wrap
dnl since older versions of that macro are seriously broken when it comes to
dnl the #-character
m4_text_wrap([$3], [@%:@warning ])[
#endif])
  AC_SUBST([$1], [$2" -D DEPRECATED_$1_USED"])
])