Add libcody

In order to separate compiler from build system, C++ Modules, as
implemented in GCC introduces a communication channel between those
two entities.  This is implemented by libcody.  It is anticipated that
other implementations will also implement this protocol, or use
libcody to provide it.

	* Makefile.def: Add libcody.
	* configure.ac: Add libcody.
	* Makefile.in: Regenerated.
	* configure: Regenerated.
	gcc/
	* Makefile.in (CODYINC, CODYLIB, CODYLIB_H): New. Use them.
	libcody/
	* configure.ac: New.
	* CMakeLists.txt: New.
	* CODING.md: New.
	* CONTRIB.md: New.
	* LICENSE: New.
	* LICENSE.gcc: New.
	* Makefile.in: New.
	* Makesub.in: New.
	* README.md: New.
	* buffer.cc: New.
	* build-aux/config.guess: New.
	* build-aux/config.sub: New.
	* build-aux/install-sh: New.
	* client.cc: New.
	* cmake/libcody-config-ix.cmake
	* cody.hh: New.
	* config.h.in: New.
	* config.m4: New.
	* configure: New.
	* configure.ac: New.
	* dox.cfg.in: New.
	* fatal.cc: New.
	* gdbinit.in: New.
	* internal.hh: New.
	* netclient.cc: New.
	* netserver.cc: New.
	* packet.cc: New.
	* resolver.cc: New.
	* server.cc: New.
	* tests/01-serialize/connect.cc: New.
	* tests/01-serialize/decoder.cc: New.
	* tests/01-serialize/encoder.cc: New.
	* tests/02-comms/client-1.cc: New.
	* tests/02-comms/pivot-1.cc: New.
	* tests/02-comms/server-1.cc: New.
	* tests/Makesub.in: New.
	* tests/jouster: New.

1 files changed, 78 insertions, 0 deletions

diff --git a/libcody/fatal.cc b/libcody/fatal.cc
new file mode 100644
index 0000000..b35094e
--- /dev/null
+++ b/libcody/fatal.cc
@@ -0,0 +1,78 @@
+// CODYlib		-*- mode:c++ -*-
+// Copyright (C) 2019-2020 Nathan Sidwell, nathan@acm.org
+// License: Apache v2.0
+
+// Cody
+#include "internal.hh"
+// C
+#include <csignal>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+namespace Cody {
+
+#if NMS_CHECKING
+void (AssertFailed) (Location loc) noexcept
+{
+  (HCF) ("assertion failed", loc);
+}
+void (Unreachable) (Location loc) noexcept
+{
+  (HCF) ("unreachable reached", loc);
+}
+#endif
+
+void (HCF) (char const *msg
+#if NMS_CHECKING
+	  , Location const loc
+#endif
+	  ) noexcept
+{ // HCF - you goofed!
+  __asm__ volatile ("nop");  // HCF - you goofed!
+
+#if !NMS_CHECKING
+  constexpr Location loc (nullptr, 0);
+#endif
+
+  fprintf (stderr, "CODYlib: %s", msg ? msg : "internal error");
+  if (char const *file = loc.File ())
+    {
+      char const *src = SRCDIR;
+
+      if (src[0])
+	{
+	  size_t l = strlen (src);
+
+	  if (!strncmp (src, file, l) && file[l] == '/')
+	    file += l + 1;
+	}
+      fprintf (stderr, " at %s:%u", file, loc.Line ());
+    }
+  fprintf (stderr, "\n");
+  raise (SIGABRT);
+  exit (2);
+}
+
+void BuildNote (FILE *stream) noexcept
+{
+  fprintf (stream, "Version %s.\n", PACKAGE_NAME " " PACKAGE_VERSION);
+  fprintf (stream, "Report bugs to %s.\n", BUGURL[0] ? BUGURL : "you");
+  if (PACKAGE_URL[0])
+    fprintf (stream, "See %s for more information.\n", PACKAGE_URL);
+  if (REVISION[0])
+    fprintf (stream, "Source %s.\n", REVISION);
+
+  fprintf (stream, "Build is %s & %s.\n",
+#if !NMS_CHECKING
+	   "un"
+#endif
+	   "checked",
+#if !__OPTIMIZE__
+	   "un"
+#endif
+	   "optimized");
+}
+
+}