MacOS support

[bnoordhuis]

Currently blocked on ABI compatibility issues between XQuartz (X server) and the Tcl/Tk shipped by Apple:

Tcl_Interp *tcl = /* ... */;
// Segfaults...
DefaultColormapOfScreen(
    XDefaultScreenOfDisplay(
        Tk_Display(Tk_MainWindow(tcl))));

Can possibly be overcome by using a third-party Tcl distro like ActiveTcl.

[bnoordhuis]

So I don't forget.

configure.ac patch:

diff --git a/configure.ac b/configure.ac
index d9c9303..6563294 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,17 +33,17 @@ AC_DEFINE(TKGATE_HOMEPAGE,  "https://github.com/bnoordhuis/tkgate",         [TkGate web
 #
 # Tcl/Tk version we will try to use (from most favored to least favored)
 #
-TKGATE_TCLTK_VERSIONS="8.5 8.4 8.3"
+TKGATE_TCLTK_VERSIONS="8.6"
 
 #
 # Directories to search for include files
 #
-TKGATE_INCDIRS="/usr/X11R6/include /usr/X11/include /pkgs/include /usr/local/include /usr/openwin/include /usr/X/include /usr/include /sw/include /opt/local/include"
+TKGATE_INCDIRS="/opt/X11/include /usr/local/opt/tcl-tk/include"
 
 #
 # Directories to search for library files
 #
-TKGATE_LIBDIRS="/usr/X11R6/lib /usr/X11/lib /pkgs/lib /usr/local/lib /usr/lib /sw/lib /opt/local/lib"
+TKGATE_LIBDIRS="/opt/X11/lib /usr/local/opt/tcl-tk/lib"
 
 #
 # Libraries we may need if available.

test program:

// cc -g -Wall -Wextra
// -I/opt/X11/include -I/usr/local/Cellar/tcl-tk/8.6.9/include t.c
// -L/opt/X11/lib -L/usr/local/Cellar/tcl-tk/8.6.9/lib
// -ltcl8.6 -ltk8.6 -lX11

#include <err.h>
#include <X11/Xlib.h>
#include <tcl.h>
#include <tk.h>

int
main(void)
{
        Tcl_Interp *tcl = Tcl_CreateInterp();

        if (TCL_ERROR == Tcl_Eval(tcl, "set tcl_library /usr/local/Cellar/tcl-tk/8.6.9/lib/tcl8.6"))
                errx(1, "Tcl_Eval: %s", Tcl_GetStringResult(tcl));

        if (TCL_ERROR == Tcl_EvalFile(tcl, "/usr/local/Cellar/tcl-tk/8.6.9/lib/tcl8.6/init.tcl"))
                errx(1, "Tcl_EvalFile: %s", Tcl_GetStringResult(tcl));

        if (TCL_ERROR == Tk_Init(tcl))
                errx(1, "Tk_Init: %s", Tcl_GetStringResult(tcl));

        Tk_Window w = Tk_MainWindow(tcl);
        Display *d = Tk_Display(w);
        Screen *s = XDefaultScreenOfDisplay(d);  // crash: d dangles
        Colormap c = XDefaultColormapOfScreen(s);
        (void) &c;

        return 0;
}

[bnoordhuis]

I've made some progress on this. Trying to use the tcl/tk from Apple or homebrew was a dead end. They're both using CoreGraphics, whereas tkgate is strictly X11 - i.e., completely incompatible.

Building tcl and tk from source (with the --with-x option in case of tk) and building and linking tkgate against that did work, now I just need to package it up into a simple recipe, probably a Makefile.