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(_AS_LINENO_PREPARE): If the current shell does not support LINENO,

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and if CONFIG_SHELL is unset or empty, and if we can find a shell that
does support LINENO, then set CONFIG_SHELL to that shell and then
re-execute ourselves with CONFIG_SHELL.
This commit is contained in:
Paul Eggert 2001-10-08 04:10:32 +00:00
parent 767b6b40e9
commit 03b5875793
1 changed files with 24 additions and 6 deletions
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30
lib/m4sugar/m4sh.m4
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@ -420,12 +420,16 @@ fi
# it protects us from repetitive rewrites. Be sure to have a test
# that does detect non LINENO support...
m4_define([_AS_LINENO_PREPARE],
[as_lineno_1=$LINENO
as_lineno_2=$LINENO
as_lineno_3=`(expr $as_lineno_1 + 1) 2>/dev/null`
if test "x$as_lineno_1" = "x$as_lineno_2" ||
test "x$as_lineno_3" != "x$as_lineno_2";
then
[as_command='
as_lineno_1=$LINENO
as_lineno_2=$LINENO
as_lineno_3=`(expr $as_lineno_1 + 1) 2>/dev/null`
test "x$as_lineno_1" != "x$as_lineno_2" &&
test "x$as_lineno_3" = "x$as_lineno_2"
'
if eval "$as_command"; then
:
else
# Find who we are. Look in the path if we contain no path at all
# relative or not.
case $[0] in
@ -442,6 +446,20 @@ if test "x$as_lineno_1" = "x$as_lineno_2" ||
if test ! -f "$as_myself"; then
AS_ERROR([cannot find myself; rerun with an absolute path])
fi
case $CONFIG_SHELL in
'')
_AS_PATH_WALK([/bin:/usr/bin:$PATH],
[for as_base in sh bash ksh sh5; do
case $as_dir in
/*)
if ("$as_dir/$as_base" -c "$as_command") 2>/dev/null; then
CONFIG_SHELL=$as_dir/$as_base
export CONFIG_SHELL
exec "$CONFIG_SHELL" "$[0]" ${1+"$[@]"}
fi;;
esac
done]);;
esac
if test ! -f "$as_me.lineno" ||
test x`ls -1dt "$as_me.lineno" "$as_myself" 2>/dev/null | sed 1q` \
!= x"$as_me.lineno"; then