Mac OS: add libedit to the set of native libraries

The libedit library supplied by Mac OS is old and does not support
Unicode, so include a build that does support it.

racket/src/native-libs/README.txt

@@ -18,6 +18,7 @@ Currently, we use the following external packages and versions:
  pkg-config-0.28
  sed-4.2 (Windows only, to avoid non-GNU `sed`)
  sqlite[-autoconf]-3220000 (Windows, Linux, and PPC Mac OS only)
+ libedit-20191231-3.1 (Mac OS only)
  openssl-1.1.1g
  libiconv-1.15 (Windows only)
  zlib-1.2.11 (Windows and Linux only)

racket/src/native-libs/build.rkt

@@ -154,6 +154,9 @@
 ;; Needed when building with old GCC, such as 4.0:
 (define-runtime-path gmp-weak-patch "patches/gmp-weak.patch")
 
+;; For `getline` on 32-bit Mac OS 10.6:
+(define-runtime-path libedit-getline-patch "patches/libedit-getline.patch")
+
 ;; Upstream patch to fix Win32 build:
 (define-runtime-path glib-win32-weekday-patch "patches/glib-win32-weekday.patch")
 
@@ -359,6 +362,10 @@
     [("pkg-config") (config #:configure (list "--with-internal-glib"))]
     [("sed") (config)]
     [("longdouble") (config)]
+    [("libedit") (config
+                  #:patches (if (and mac? m32?)
+                                (list libedit-getline-patch)
+                                null))]
     [("libiconv")
      (nonmac-only)
      (config)]

racket/src/native-libs/install.rkt

@@ -42,7 +42,8 @@
     "libpangowin32-1.0.0"))
 
 (define mac-libs
-  '("PSMTabBarControl.framework"))
+  '("libedit.0"
+    "PSMTabBarControl.framework"))
 
 (define mac64-libs
   '("MMTabBarView.framework"))
@@ -129,7 +130,10 @@
       ["libiconv-2" "libiconv is released under the GNU Lesser General Public License (GNU LGPL)."]
       ["longdouble" ,(~a "The source to longdouble is included with the Racket source code,\n"
                          "which is available from\n"
-                         "  http://www.racket-lang.org/")])]
+                         "  http://www.racket-lang.org/")]
+      ["libedit" ,(~a "This package includes libedit software developed for NetBSD under the\n"
+                      "NetBSD license.")])]
+
     ["math"
      ""
      "math"

racket/src/native-libs/patches/libedit-getline.patch

@@ -0,0 +1,62 @@
+diff -u -r old/libedit-20191231-3.1/src/sys.h new/libedit-20191231-3.1/src/sys.h
+--- old/libedit-20191231-3.1/src/sys.h	2020-08-27 10:57:43.000000000 -0600
++++ new/libedit-20191231-3.1/src/sys.h	2020-08-27 10:57:56.000000000 -0600
+@@ -43,6 +43,7 @@
+ #ifdef HAVE_SYS_CDEFS_H
+ #include <sys/cdefs.h>
+ #endif
++#include <sys/types.h>
+ 
+ #if !defined(__attribute__) && (defined(__cplusplus) || !defined(__GNUC__)  || __GNUC__ == 2 && __GNUC_MINOR__ < 8)
+ # define __attribute__(A)
+diff -u -r old/libedit-20191231-3.1/src/wcsdup.c new/libedit-20191231-3.1/src/wcsdup.c
+--- old/libedit-20191231-3.1/src/wcsdup.c	2020-08-27 10:57:43.000000000 -0600
++++ new/libedit-20191231-3.1/src/wcsdup.c	2020-08-27 12:03:37.000000000 -0600
+@@ -41,3 +41,46 @@
+ }
+ 
+ #endif
++
++
++#ifndef HAVE_GETLINE
++#include <sys/types.h>
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
++
++ssize_t getline(char **line, size_t *len, FILE *fp) {
++  char *buffer, *r;
++  int buflen, delta = 0, slen;
++
++  if (*line == NULL) {
++    buflen = 256;
++    buffer = malloc(buflen);
++  } else {
++    buffer = *line;
++    buflen = *len;
++    if (buflen == 0) {
++      buflen = 128;
++      buffer = realloc(buffer, buflen);
++    }
++  }
++
++  while (1) {
++    r = fgets(buffer + delta, buflen - delta, fp);
++    if (!r) {
++      if (delta == 0)
++        return -1;
++    }
++    delta += strlen(buffer + delta);
++    if ((delta > 0) && (buffer[delta-1] == '\n')) {
++      *line = buffer;
++      *len  = buflen;
++      return delta;
++    }
++    if (delta + 1 == buflen) {
++      buflen *= 2;
++      buffer = realloc(buffer, buflen);
++    }
++  }
++}
++#endif
+Only in new/libedit-20191231-3.1/src: wcsdup.c~