support for platform-specific executables;

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/System/executable.scala	Sun Oct 11 22:26:55 2020 +0200
@@ -0,0 +1,38 @@
+/*  Title:      Pure/System/executable.scala
+    Author:     Makarius
+
+Support for platform-specific executables.
+*/
+
+package isabelle
+
+
+object Executable
+{
+  def libraries(path: Path, mingw: MinGW = MinGW.none): List[Path] =
+  {
+    val path1 = path.expand
+    val dir = path1.dir
+    val exe = path1.base
+
+    def command_output(cmd: String): List[String] =
+    {
+      val script = mingw.bash_script(cmd + " " + File.bash_path(exe))
+      Library.split_lines(Isabelle_System.bash(script, cwd = dir.file).check.out)
+    }
+
+    if (Platform.is_macos) {
+      val Pattern = """^\s*(.+)\s+\(.*\)$""".r
+      for { Pattern(a) <- command_output("otool -L") } yield {
+        Library.try_unprefix("@executable_path/", a) match {
+          case None => Path.explode(a)
+          case Some(b) => dir + Path.explode(b)
+        }
+      }
+    }
+    else {
+      val Pattern = """^.*=>\s*(.+)\s+\(.*\)$""".r
+      for { Pattern(a) <- command_output("ldd") } yield Path.explode(a)
+    }
+  }
+}

--- a/src/Pure/build-jars	Sun Oct 11 18:46:44 2020 +0100
+++ b/src/Pure/build-jars	Sun Oct 11 22:26:55 2020 +0200
@@ -125,6 +125,7 @@
   src/Pure/System/command_line.scala
   src/Pure/System/cygwin.scala
   src/Pure/System/distribution.scala
+  src/Pure/System/executable.scala
   src/Pure/System/getopts.scala
   src/Pure/System/isabelle_charset.scala
   src/Pure/System/isabelle_fonts.scala