postgresql/config/general.m4
Peter Eisentraut 353371874f Replace brain-dead Autoconf macros AC_ARG_{ENABLE,WITH} with something
that's actually useful, robust, consistent.

Better plan to generate aclocal.m4 as well: use m4 include directives,
rather than cat.
2000-09-21 20:17:43 +00:00

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# $Header: /cvsroot/pgsql/config/general.m4,v 1.1 2000/09/21 20:17:42 petere Exp $
# This file defines new macros to process configure command line
# arguments, to replace the brain-dead AC_ARG_WITH and AC_ARG_ENABLE.
# The flaw in these is particularly that they only differentiate
# between "given" and "not given" and do not provide enough help to
# process arguments that only accept "yes/no", that require an
# argument (other than "yes/no"), etc.
#
# The point of this implementation is to reduce code size and
# redundancy in configure.in and to improve robustness and consistency
# in the option evaluation code.
# print an error message and exit (while running `autoconf')
define([pgac_error],
[errprint(__file__:__line__[: error: $1
])
m4exit(10)])
# Convert type and name to shell variable name (e.g., "enable_long_strings")
define([pgac_arg_to_variable],
[$1[]_[]patsubst($2, -, _)])
# PGAC_ARG(TYPE, NAME, HELP-STRING,
# [ACTION-IF-YES], [ACTION-IF-NO], [ACTION-IF-ARG],
# [ACTION-IF-OMITTED])
# ----------------------------------------------------------
# This is the base layer. TYPE is either "with" or "enable", depending
# on what you like. NAME is the rest of the option name, HELP-STRING
# as usual. ACTION-IF-YES is executed if the option is given without
# and argument (or "yes", which is the same); similar for ACTION-IF-NO.
AC_DEFUN([PGAC_ARG],
[dnl Check arguments
ifelse([$1], enable, ,
[$1], with, ,
[pgac_error([first argument of $0 must be `enable' or `with', not `$1'])])[]dnl
define([pgac_variable], [pgac_arg_to_variable([$1], [$2])])[]dnl
dnl Register help string, only if there is one
ifelse([$3], [], [],
[AC_DIVERT_PUSH(AC_DIVERSION_NOTICE)dnl
ac_help="$ac_help
[$3]"
AC_DIVERT_POP()])dnl
[#] Check whether --$1-$2 was given
if test x"[$]{pgac_variable+set}" = xset; then
case [$]pgac_variable in
yes)
ifelse([$4], [], :, [$4])
;;
no)
ifelse([$5], [], :, [$5])
;;
dnl Action if called with argument
ifelse([$6], [], [],
[ *)
dnl Set up $withval or $enableval
$1[]val=[$]pgac_variable
$6
;;
])[]dnl
esac [#] [$]pgac_variable
dnl Action if omitted
ifelse([$7], [], [],
[else
$7
])[]dnl
fi[]dnl
undefine([pgac_variable])dnl
])# PGAC_ARG
# PGAC_ARG_BOOL(TYPE, NAME, DEFAULT, HELP-STRING,
# [ACTION-IF-YES], [ACTION-IF-NO])
# -----------------------------------------------
# Accept a boolean option, that is, one that only takes yes or no.
# ("no" is equivalent to "disable" or "without"). DEFAULT is what
# should be done if the option is omitted; it should be "yes" or "no".
# (Consequently, one of ACTION-IF-YES and ACTION-IF-NO will always
# execute.)
AC_DEFUN([PGAC_ARG_BOOL],
[PGAC_ARG([$1], [$2], [$4], [$5], [$6],
[AC_MSG_ERROR([no argument expected for --$1-$2 option])],
[ifelse([$3], yes, [pgac_arg_to_variable([$1], [$2])=yes
$5],
[$3], no, [pgac_arg_to_variable([$1], [$2])=no
$6],
[pgac_error([third argument of $0 must be `yes' or `no', not `$3'])])])[]dnl
])# PGAC_ARG_BOOL
# PGAC_ARG_REQ(TYPE, NAME, HELP-STRING, [ACTION-IF-GIVEN], [ACTION-IF-NOT-GIVEN])
# -------------------------------------------------------------------------------
# This option will require an argument; "yes" or "no" will not be
# accepted.
AC_DEFUN([PGAC_ARG_REQ],
[PGAC_ARG([$1], [$2], [$3],
[AC_MSG_ERROR([argument required for --$1-$2 option])],
[AC_MSG_ERROR([argument required for --$1-$2 option])],
[$4],
[$5])])# PGAC_ARG_REQ
# PGAC_ARG_OPTARG(TYPE, NAME, HELP-STRING, [DEFAULT-ACTION], [ARG-ACTION]
# [ACTION-ENABLED], [ACTION-DISABLED])
# -----------------------------------------------------------------------
# This will create an option that behaves as follows: If omitted, or
# called with "no", then set the enable_variable to "no" and do
# nothing else. If called with "yes", then execute DEFAULT-ACTION. If
# called with argument, set enable_variable to "yes" and execute
# ARG-ACTION. Additionally, execute ACTION-ENABLED if we ended up with
# "yes" either way, else ACTION-DISABLED.
#
# The intent is to allow enabling a feature, and optionally pass an
# additional piece of information.
AC_DEFUN([PGAC_ARG_OPTARG],
[PGAC_ARG([$1], [$2], [$3], [$4], [],
[pgac_arg_to_variable([$1], [$2])=yes
$5],
[pgac_arg_to_variable([$1], [$2])=no])
dnl Add this code only if there's a ACTION-ENABLED or ACTION-DISABLED.
ifelse([$6[]$7], [], [],
[
if test "[$]pgac_arg_to_variable([$1], [$2])" = yes; then
ifelse([$6], [], :, [$6])
ifelse([$7], [], [],
[else
$7
])[]dnl
fi
])[]dnl
])# PGAC_ARG_OPTARG