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configure: don't infloop when re-executing with $CONFIG_SHELL

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It turns out our guard against infinite recursion wasn't good
enough when shells without $LINENO support were involved, since
the creation-and-sourcing of configure.lineno broke the guard's
expectations.  Reports by Tim Rice and Paul Eggert.

* lib/m4sugar/m4sh.m4 (_AS_LINENO_PREPARE): Export '_as_can_reexec'
to "no" before sourcing the just-created configure.lineno.
This commit is contained in:
Stefano Lattarini 2012-03-03 10:44:25 +01:00
parent 46a40ee9c4
commit cca288d94e
1 changed files with 4 additions and 0 deletions
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lib/m4sugar/m4sh.m4
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@ -1199,6 +1199,10 @@ dnl Eggert wrote the scripts with optimization help from Paolo Bonzini).
chmod +x "$as_me.lineno"] ||
AS_ERROR([cannot create $as_me.lineno; rerun with a POSIX shell])
# If we had to re-execute with $CONFIG_SHELL, we're ensured to have
# already done that, so ensure we don't try to do so again and fall
# in an infinite loop. This has already happened in practice.
_as_can_reexec=no; export _as_can_reexec
# Don't try to exec as it changes $[0], causing all sort of problems
# (the dirname of $[0] is not the place where we might find the
# original and so on. Autoconf is especially sensitive to this).