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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Mon, 10 Aug 2015 08:59:51 -0700
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Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
        "Re: Deadlock when receiving kill-signal from child process" (Aug 10,  4:02am)
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To: zsh workers <zsh-workers@zsh.org>
Subject: Re: Deadlock when receiving kill-signal from child process
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On Aug 10,  4:02am, Mikael Magnusson wrote:
} Subject: Re: Deadlock when receiving kill-signal from child process
}
} I think --enable-zsh-debug only sets the DEBUG define, and nothing
} more.

My generated configure script contains:

if test -n "$auto_cflags" && test ."$ansi2knr" != .yes; then
  if test "${enable_zsh_debug}" = yes; then
    if test -n "$GCC"; then
      CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -ggdb"
    else
      CFLAGS="$CFLAGS -g"
    fi
  else
    if test -n "$GCC"; then
      CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -O2"
    else
      CFLAGS="$CFLAGS -O"
    fi
  fi
fi

So apparently on Mathias's platform, passing -g plus not passing -O is
not sufficient to actually enable debugging symbols.