[MacPorts] #71615: graphviz @12.2.1+smyrna: error: implicit declaration of function 'readln' is invalid in C99 [-Werror, -Wimplicit-function-declaration] (was: graphviz @12.2.1 +gdk_pixbuf+guile+java+ocaml+pangocairo+perl+poppler+python27+rsvg+ruby+smyrna+tcl+x11: error: implicit declaration of function 'readln' is invalid in C99 [-Werror, -Wimplicit-function-declaration])

[MacPorts]

#71615: graphviz @12.2.1+smyrna: error: implicit declaration of function 'readln'
is invalid in C99 [-Werror,-Wimplicit-function-declaration]
---------------------------------------+------------------------
  Reporter:  cooljeanius               |      Owner:  ryandesign
      Type:  defect                    |     Status:  accepted
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:  2.10.5
Resolution:                            |   Keywords:
      Port:  graphviz, graphviz-devel  |
---------------------------------------+------------------------
Changes (by ryandesign):

 * status:  new => accepted
 * owner:  (none) => ryandesign
 * port:  graphviz => graphviz, graphviz-devel
 * cc: ryandesign (removed)


Comment:

 Replying to [ticket:71615 cooljeanius]:
 > So, it's another victim of `-Werror=implicit-function-declaration` being
 on by default now.

 Not exactly. It's a victim of the developers of Graphviz having evidently
 never tried to build this version of Smyrna on macOS. If they had, they
 would have noticed that they are using a function without declaring it.
 Implicit function declarations being an error now just enables us to see
 the error sooner. If that were not an error, it would fail later with a
 link error:

 {{{
 Undefined symbols for architecture x86_64:
   "_readln", referenced from:
       _main in main.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 }}}

 I filed a bug report: https://gitlab.com/graphviz/graphviz/-/issues/2631

-- 
Ticket URL: <https://trac.macports.org/ticket/71615#comment:1>
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