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* genman.txr (dupes, tagnum): Replace defvar with defvarl.
* stdlib/doc-lookup.tl (os-symbol): Same.
* tests/011/macros-3.tl (x): Same.
* tests/011/mandel.txr (x-centre, y-centre, width, i-max, j-max, n)
(r-max, pixel-size, x-offset, y-offset): Same.
(file, colour-max): Delete (unused) variables.
* tests/012/circ.tl (x): Replace defvar with defvarl.
* tests/012/stack.tl (stack-limited): Same.
* tests/012/struct.tl (s): Same.
* tests/013/maze.tl (vi, pa, sc): Delete variables. Use
function arguments instead.
(usage): Fix typo.
* tests/014/dgram-stream.tl (family): Rename to...
(*family*): ...this.
* tests/014/socket-basic.tl (socktype): Rename to...
(*socktype*): ...this.
(%iters%): Replace defvar with defvarl.
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* gc.c (gc_init): We must check rlim_cur for the RLIM_INFINITY
value indicating unlimited stack, and not misuse this value as a
limit number, otherwise hilarity ensues. This reproduced on
an older platform with make 3.81, which calls setrlimit to
bring about an unlimited stack, passed on to child processes.
Because of this txr segfaulted, as a consequence of a false
positive.
* tests/012/stack.tl (stack-limited): New variable which
indicates whether there is a stack limit. If there isn't, we
avoid running the fork-based test case. Also, we set the stack
limit to 32768 so we have a limit against which to run some of
the tests.
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* signal.c (sig_handler): For a is_cpu_exception signal, we
temporarily disable the stack limit. It might be executing on
the sigaltstack buffer, which is almost certainly below the
stack limit.
* tests/012/stack.tl: New test case. We raise a SIGSEGV
and check that in the handler, the stack limit is disabled,
and that we can executed code.
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* tests/012/stack.tl: New file.
* tets/common.tl (mvtest): New macro.
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