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* acgeneral.m4 (AC_SHELL_UNSET, AC_SHELL_UNSETENV): New macro.
(_AC_INIT_PREPARE_ENVIRONMENT): Use AC_SHELL_UNSETENV. Set CDPATH. Fixes Autoconf/96. * doc/autoconf.texi (Special Shell Variables): New node. Document `status', `CDPATH', `LANG', `LC_ALL', `LC_MESSAGES' and `LC_CTYPE'.
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Akim Demaille
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10
ChangeLog
10
ChangeLog
@ -1,3 +1,13 @@
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2000-05-19 Akim Demaille <akim@epita.fr>
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* acgeneral.m4 (AC_SHELL_UNSET, AC_SHELL_UNSETENV): New macro.
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(_AC_INIT_PREPARE_ENVIRONMENT): Use AC_SHELL_UNSETENV.
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Set CDPATH. Fixes Autoconf/96.
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* doc/autoconf.texi (Special Shell Variables): New node.
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Document `status', `CDPATH', `LANG', `LC_ALL', `LC_MESSAGES' and
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`LC_CTYPE'.
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2000-05-12 Akim Demaille <akim@epita.fr>
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* acgeneral.m4 (sinclude): Define, some packages (binutils) need
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44
acgeneral.m4
44
acgeneral.m4
@ -473,6 +473,22 @@ $debug ||
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])# _AC_SHELL_TMPDIR
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# AC_SHELL_UNSET(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `'])
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# --------------------------------------------------------
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# Try to unset the env VAR, otherwise set it to
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# VALUE-IF-UNSET-NOT-SUPPORTED. `ac_unset' must have been computed.
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define([AC_SHELL_UNSET],
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[$ac_unset $1 || test ${$1+set} != set || $1=$2])
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# AC_SHELL_UNSETENV(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `'])
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# --------------------------------------------------------
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# Try to unset the env VAR, otherwise set it to
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# VALUE-IF-UNSET-NOT-SUPPORTED. `ac_unset' must have been computed.
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define([AC_SHELL_UNSETENV],
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[$ac_unset $1 || test ${$1+set} != set || $1=$2 && export $1])
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## --------------------------------------------------- ##
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## Common m4/sh handling of variables (indirections). ##
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## --------------------------------------------------- ##
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@ -1436,29 +1452,33 @@ fi])dnl
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])# _AC_INIT_VERSION
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# _AC_INIT_PREPARE_ENVIRONMENT
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# ----------------------------
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# Tune the envvar we depend upon: IFS, NLS.
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# FIXME: CDPATH.
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define([_AC_INIT_PREPARE_ENVIRONMENT],
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[# NLS nuisances.
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# Only set these to C if already set. These must not be set unconditionally
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# because not all systems understand e.g. LANG=C (notably SCO).
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# Fixing LC_MESSAGES prevents Solaris sh from translating var values in `set'!
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# Non-C LC_CTYPE values break the ctype check.
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if test "${LANG+set}" = set; then LANG=C; export LANG; fi
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if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi
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if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi
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if test "${LC_CTYPE+set}" = set; then LC_CTYPE=C; export LC_CTYPE; fi
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[if (unset FOO) >/dev/null 2>&1; then
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ac_unset=unset
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else
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ac_unset=false
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fi
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# NLS nuisances.
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AC_SHELL_UNSETENV([LANG], [C])
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AC_SHELL_UNSETENV([LC_ALL], [C])
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AC_SHELL_UNSETENV([LC_CTYPE], [C])
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AC_SHELL_UNSETENV([LC_MESSAGES], [C])
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# IFS
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# We need space, tab and new line, in precisely that order.
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ac_nl='
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'
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IFS=" $ac_nl"dnl
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IFS=" $ac_nl"
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# CDPATH.
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AC_SHELL_UNSETENV([CDPATH], [:])
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])
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# _AC_INIT_PREPARE
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# ----------------
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# Called by AC_INIT to build the preamble of the `configure' scripts.
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@ -252,6 +252,7 @@ Checking Run Time Behavior
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Portable Shell Programming
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* Special Shell Variables::
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* Testing Values and Files:: Checking strings and files
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* Shell Substitutions:: Test and assign
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* Limitations of Usual Tools:: Portable use of portable tools
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@ -4515,13 +4516,77 @@ well; for example, don't rely on @code{ln} having a @samp{-f} option or
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@code{cat} having any options.
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@menu
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* Special Shell Variables:: Variables you should not change
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* Testing Values and Files:: Checking strings and files
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* Shell Substitutions:: Test and assign
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* Limitations of Usual Tools:: Portable use of portable tools
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* Exiting from Shell Scripts:: How to exit from an autoconf shell script
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@end menu
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@node Testing Values and Files, Shell Substitutions, Portable Shell, Portable Shell
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@node Special Shell Variables, Testing Values and Files, Portable Shell, Portable Shell
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@subsection Special Shell Variables
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Some shell variables shall not be used. Since currently Autoconf does
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not use @code{unset}, there are some variables which need some specific
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values to disable the features they control.
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@c Alphabetical order, case insensitive, `A' before `a'.
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@table @code
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@item CDPATH
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@evindex CDPATH
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Because when this variable is set @code{cd} is verbose, idioms such as
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@samp{abs=`cd $rel && pwd`} break, since @code{abs} receives twice the
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path.
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@c FIXME: Which shells? How do they behave?
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Setting @code{CDPATH} to the empty value is not enough for most shells.
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A simple colon is enough but for @code{zsh}, which prefers a leading dot:
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@example
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~ % mkdir foo && CDPATH=: cd foo
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~/foo
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~ % CDPATH=:. cd foo
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~/foo
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~ % CDPATH=.: cd foo
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~ %
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@end example
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@noindent
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(of course we could just @code{unset} @code{CDPATH}, it also behaves
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properly if set to the empty string).
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Therefore a portable solution to neutralize @samp{CDPATH} is
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@samp{CDPATH=$@{ZSH_VERSION+.@}:}.
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@item LANG
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@itemx LC_ALL
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@itemx LC_MESSAGES
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@itemx LC_CTYPE
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@evindex LANG
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@evindex LC_ALL
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@evindex LC_MESSAGES
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@evindex LC_CTYPE
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These must not be set unconditionally because not all systems understand
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e.g. @strong{LANG=C} (notably SCO). Fixing @code{LC_MESSAGES} prevents
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Solaris @command{sh} from translating var values in @code{set}! Non-C
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@code{LC_CTYPE} values break the ctype check. Therefore, run:
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@example
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test "$@{LANG+set@}" = set && LANG=C && export LANG
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test "$@{LC_ALL+set@}" = set && LC_ALL=C && export LC_ALL
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test "$@{LC_CTYPE+set@}" = set && LC_CTYPE=C && export LC_CTYPE
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test "$@{LC_MESSAGES+set@}" = set && LC_MESSAGES=C && export LC_MESSAGES
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@end example
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@item status
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@evindex status
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This variable is an alias to @samp{$?} for @code{zsh} (at least 3.1.6),
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hence read-only. Do not use it.
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@end table
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@node Testing Values and Files, Shell Substitutions, Special Shell Variables, Portable Shell
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@subsection Testing Values and Files
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@code{configure} scripts need to test properties of many files and
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@ -473,6 +473,22 @@ $debug ||
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])# _AC_SHELL_TMPDIR
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# AC_SHELL_UNSET(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `'])
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# --------------------------------------------------------
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# Try to unset the env VAR, otherwise set it to
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# VALUE-IF-UNSET-NOT-SUPPORTED. `ac_unset' must have been computed.
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define([AC_SHELL_UNSET],
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[$ac_unset $1 || test ${$1+set} != set || $1=$2])
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# AC_SHELL_UNSETENV(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `'])
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# --------------------------------------------------------
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# Try to unset the env VAR, otherwise set it to
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# VALUE-IF-UNSET-NOT-SUPPORTED. `ac_unset' must have been computed.
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define([AC_SHELL_UNSETENV],
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[$ac_unset $1 || test ${$1+set} != set || $1=$2 && export $1])
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## --------------------------------------------------- ##
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## Common m4/sh handling of variables (indirections). ##
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## --------------------------------------------------- ##
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@ -1436,29 +1452,33 @@ fi])dnl
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])# _AC_INIT_VERSION
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# _AC_INIT_PREPARE_ENVIRONMENT
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# ----------------------------
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# Tune the envvar we depend upon: IFS, NLS.
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# FIXME: CDPATH.
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define([_AC_INIT_PREPARE_ENVIRONMENT],
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[# NLS nuisances.
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# Only set these to C if already set. These must not be set unconditionally
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# because not all systems understand e.g. LANG=C (notably SCO).
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# Fixing LC_MESSAGES prevents Solaris sh from translating var values in `set'!
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# Non-C LC_CTYPE values break the ctype check.
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if test "${LANG+set}" = set; then LANG=C; export LANG; fi
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if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi
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if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi
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if test "${LC_CTYPE+set}" = set; then LC_CTYPE=C; export LC_CTYPE; fi
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[if (unset FOO) >/dev/null 2>&1; then
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ac_unset=unset
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else
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ac_unset=false
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fi
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# NLS nuisances.
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AC_SHELL_UNSETENV([LANG], [C])
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AC_SHELL_UNSETENV([LC_ALL], [C])
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AC_SHELL_UNSETENV([LC_CTYPE], [C])
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AC_SHELL_UNSETENV([LC_MESSAGES], [C])
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# IFS
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# We need space, tab and new line, in precisely that order.
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ac_nl='
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'
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IFS=" $ac_nl"dnl
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IFS=" $ac_nl"
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# CDPATH.
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AC_SHELL_UNSETENV([CDPATH], [:])
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])
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# _AC_INIT_PREPARE
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# ----------------
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# Called by AC_INIT to build the preamble of the `configure' scripts.
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