[MacPorts] #61897: tcl @8.6.10_0 +corefoundation +threads : configure tests failing with "implicitly declaring ... function" error

[MacPorts]

#61897: tcl @8.6.10_0 +corefoundation +threads : configure tests failing with
"implicitly declaring ... function" error
-----------------------+--------------------
 Reporter:  lmhaffner  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:  bigsur     |       Port:  tcl
-----------------------+--------------------
 A number of tests in `configure` are failing as this warning seems to have
 been elevated to an error in macOS 11.x/XCode 12.3(?). One example from
 the attached `config.log`:

 {{{
 conftest.c:26:7: error: implicitly declaring library function 'exit' with
 type 'void (int) __attribute__((noreturn))' [-Werror,-Wimp
 licit-function-declaration]
       exit(2);
       ^
 conftest.c:26:7: note: include the header <stdlib.h> or explicitly provide
 a declaration for 'exit'
 1 error generated.
 }}}

 In some cases, this prevents an expected success (e.g., `strtoul`
 implementation testing) and is leading to odd errors downstream (e.g.,
 `tclx` compilation failing due to a missing symbol in `libtclstub8.6.a`).

-- 
Ticket URL: <https://trac.macports.org/ticket/61897>
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