m4/cond.m4

   1 # serial 3
   2
   3 # AM_CONDITIONAL(NAME, SHELL-CONDITION)
   4 # -------------------------------------
   5 # Define a conditional.
   6 #
   7 # FIXME: Once using 2.50, use this:
   8 # m4_match([$1], [^TRUE\|FALSE$], [AC_FATAL([$0: invalid condition: $1])])dnl
   9 AC_DEFUN([AM_CONDITIONAL],
  10 [ifelse([$1], [TRUE],
  11         [errprint(__file__:__line__: [$0: invalid condition: $1
  12 ])dnl
  13 m4exit(1)])dnl
  14 ifelse([$1], [FALSE],
  15        [errprint(__file__:__line__: [$0: invalid condition: $1
  16 ])dnl
  17 m4exit(1)])dnl
  18 AC_SUBST([$1_TRUE])
  19 AC_SUBST([$1_FALSE])
  20 if $2; then
  21   $1_TRUE=
  22   $1_FALSE='#'
  23 else
  24   $1_TRUE='#'
  25   $1_FALSE=
  26 fi])