[MacPorts] #61515: Brew zsh hangs on $(...) command substitution in Big Sur 11.0.1

[MacPorts]

#61515: Brew zsh hangs on $(...) command substitution in Big Sur 11.0.1
-------------------------+----------------------
  Reporter:  joelburton  |      Owner:  larryv
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  bigsur
      Port:  zsh         |
-------------------------+----------------------

Comment (by ryandesign):

 {{{
 $ grep \ implicit -r work/zsh-5.8/config.log
 work/zsh-5.8/config.log:conftest.c:225:14: error: implicit declaration of
 function 'tgetent' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:230:6: error: implicit declaration of
 function 'tgetstr' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:231:2: error: implicit declaration of
 function 'creat' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:233:5: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:225:14: error: implicit declaration of
 function 'tgetent' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:230:6: error: implicit declaration of
 function 'tgetstr' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:231:2: error: implicit declaration of
 function 'creat' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:233:5: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:251:24: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:251:40: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:283:5: error: implicit declaration of
 function 'unlink' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:285:8: error: implicit declaration of
 function 'mkfifo' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:289:2: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:290:11: error: implicit declaration of
 function 'fork' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:295:17: error: implicit declaration of
 function 'read' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:298:22: error: implicit declaration of
 function 'write' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:287:2: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:283:5: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:298:9: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:282:5: error: implicitly declaring
 library function 'sprintf' with type 'int (char *, const char *, ...)'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:282:27: error: implicit declaration of
 function 'getpid' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:282:37: error: implicit declaration of
 function 'rand' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:284:14: error: implicitly declaring
 library function 'strcpy' with type 'char *(char *, const char *)'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:287:5: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:287:31: error: implicitly declaring
 library function 'strcmp' with type 'int (const char *, const char *)'
 [-Werror,-Wimplicit-function-declaration]
 work/zsh-5.8/config.log:conftest.c:293:5: error: implicit declaration of
 function 'read' is invalid in C99 [-Werror,-Wimplicit-function-
 declaration]
 work/zsh-5.8/config.log:conftest.c:315:13: error: implicitly declaring
 library function 'exit' with type 'void (int) __attribute__((noreturn))'
 [-Werror,-Wimplicit-function-declaration]
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/61515#comment:3>
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