Add Go frontend, libgo library, and Go testsuite.

gcc/:
	* gcc.c (default_compilers): Add entry for ".go".
	* common.opt: Add -static-libgo as a driver option.
	* doc/install.texi (Configuration): Mention libgo as an option for
	--enable-shared.  Mention go as an option for --enable-languages.
	* doc/invoke.texi (Overall Options): Mention .go as a file name
	suffix.  Mention go as a -x option.
	* doc/frontends.texi (G++ and GCC): Mention Go as a supported
	language.
	* doc/sourcebuild.texi (Top Level): Mention libgo.
	* doc/standards.texi (Standards): Add section on Go language.
	Move references for other languages into their own section.
	* doc/contrib.texi (Contributors): Mention that I contributed the
	Go frontend.
gcc/testsuite/:
	* lib/go.exp: New file.
	* lib/go-dg.exp: New file.
	* lib/go-torture.exp: New file.
	* lib/target-supports.exp (check_compile): Match // Go.

From-SVN: r167407

1 files changed, 327 insertions, 0 deletions

diff --git a/gcc/go/gospec.c b/gcc/go/gospec.c
new file mode 100644
index 0000000..c8f2bad
--- /dev/null
+++ b/gcc/go/gospec.c
@@ -0,0 +1,327 @@
+/* gospec.c -- Specific flags and argument handling of the gcc Go front end.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "gcc.h"
+#include "opts.h"
+
+/* This bit is set if we saw a `-xfoo' language specification.  */
+#define LANGSPEC	(1<<1)
+/* This bit is set if they did `-lm' or `-lmath'.  */
+#define MATHLIB		(1<<2)
+/* This bit is set if they did `-lpthread'.  */
+#define THREADLIB	(1<<3)
+/* This bit is set if they did `-lc'.  */
+#define WITHLIBC	(1<<4)
+/* Skip this option.  */
+#define SKIPOPT		(1<<5)
+
+#ifndef MATH_LIBRARY
+#define MATH_LIBRARY "m"
+#endif
+#ifndef MATH_LIBRARY_PROFILE
+#define MATH_LIBRARY_PROFILE MATH_LIBRARY
+#endif
+
+#define THREAD_LIBRARY "pthread"
+#define THREAD_LIBRARY_PROFILE THREAD_LIBRARY
+
+#define LIBGO "go"
+#define LIBGO_PROFILE LIBGO
+#define LIBGOBEGIN "gobegin"
+
+void
+lang_specific_driver (struct cl_decoded_option **in_decoded_options,
+		      unsigned int *in_decoded_options_count,
+		      int *in_added_libraries)
+{
+  unsigned int i, j;
+
+  /* If true, the user gave us the `-p' or `-pg' flag.  */
+  bool saw_profile_flag = false;
+
+  /* This is a tristate:
+     -1 means we should not link in libgo
+     0  means we should link in libgo if it is needed
+     1  means libgo is needed and should be linked in.
+     2  means libgo is needed and should be linked statically.  */
+  int library = 0;
+
+  /* The new argument list will be contained in this.  */
+  struct cl_decoded_option *new_decoded_options;
+
+  /* "-lm" or "-lmath" if it appears on the command line.  */
+  const struct cl_decoded_option *saw_math = 0;
+
+  /* "-lpthread" if it appears on the command line.  */
+  const struct cl_decoded_option *saw_thread = 0;
+
+  /* "-lc" if it appears on the command line.  */
+  const struct cl_decoded_option *saw_libc = 0;
+
+  /* An array used to flag each argument that needs a bit set for
+     LANGSPEC, MATHLIB, or WITHLIBC.  */
+  int *args;
+
+  /* Whether we need the thread library.  */
+  int need_thread = 0;
+
+  /* By default, we throw on the math library if we have one.  */
+  int need_math = (MATH_LIBRARY[0] != '\0');
+
+  /* True if we saw -static.  */
+  int static_link = 0;
+
+  /* True if we should add -shared-libgcc to the command-line.  */
+  int shared_libgcc = 1;
+
+  /* The total number of arguments with the new stuff.  */
+  unsigned int argc;
+
+  /* The argument list.  */
+  struct cl_decoded_option *decoded_options;
+
+  /* The number of libraries added in.  */
+  int added_libraries;
+
+  /* The total number of arguments with the new stuff.  */
+  int num_args = 1;
+
+  argc = *in_decoded_options_count;
+  decoded_options = *in_decoded_options;
+  added_libraries = *in_added_libraries;
+
+  args = XCNEWVEC (int, argc);
+
+  for (i = 1; i < argc; i++)
+    {
+      const char *arg = decoded_options[i].arg;
+
+      switch (decoded_options[i].opt_index)
+	{
+	case OPT_nostdlib:
+	case OPT_nodefaultlibs:
+	  library = -1;
+	  break;
+
+	case OPT_l:
+	  if (strcmp (arg, MATH_LIBRARY) == 0)
+	    {
+	      args[i] |= MATHLIB;
+	      need_math = 0;
+	    }
+	  else if (strcmp (arg, THREAD_LIBRARY) == 0)
+	    args[i] |= THREADLIB;
+	  else if (strcmp (arg, "c") == 0)
+	    args[i] |= WITHLIBC;
+	  else
+	    /* Unrecognized libraries (e.g. -lfoo) may require libgo.  */
+	    library = (library == 0) ? 1 : library;
+	  break;
+
+	case OPT_pg:
+	case OPT_p:
+	  saw_profile_flag = true;
+	  break;
+
+	case OPT_x:
+	  if (library == 0 && strcmp (arg, "go") == 0)
+	    library = 1;
+	  break;
+
+	case OPT_Xlinker:
+	case OPT_Wl_:
+	  /* Arguments that go directly to the linker might be .o files,
+	     or something, and so might cause libgo to be needed.  */
+	  if (library == 0)
+	    library = 1;
+	  break;
+
+	case OPT_c:
+	case OPT_S:
+	case OPT_E:
+	case OPT_M:
+	case OPT_MM:
+	case OPT_fsyntax_only:
+	  /* Don't specify libraries if we won't link, since that would
+	     cause a warning.  */
+	  library = -1;
+	  break;
+
+	case OPT_static:
+	  static_link = 1;
+	  break;
+
+	case OPT_static_libgcc:
+	  shared_libgcc = 0;
+	  break;
+
+	case OPT_static_libgo:
+	  library = library >= 0 ? 2 : library;
+	  args[i] |= SKIPOPT;
+	  break;
+
+	case OPT_SPECIAL_input_file:
+	  if (library == 0)
+	    library = 1;
+	  break;
+	}
+    }
+
+  /* There's no point adding -shared-libgcc if we don't have a shared
+     libgcc.  */
+#ifndef ENABLE_SHARED_LIBGCC
+  shared_libgcc = 0;
+#endif
+
+  /* Make sure to have room for the trailing NULL argument.  */
+  num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 5;
+  new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
+
+  i = 0;
+  j = 0;
+
+  /* Copy the 0th argument, i.e., the name of the program itself.  */
+  new_decoded_options[j++] = decoded_options[i++];
+
+  /* If we are linking, pass -fsplit-stack if it is supported.  */
+#ifdef TARGET_CAN_SPLIT_STACK
+  if (library >= 0)
+    {
+      generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER,
+		       &new_decoded_options[j]);
+      j++;
+    }
+#endif
+
+  /* NOTE: We start at 1 now, not 0.  */
+  while (i < argc)
+    {
+      new_decoded_options[j] = decoded_options[i];
+
+      /* Make sure -lgo is before the math library, since libgo itself
+	 uses those math routines.  */
+      if (!saw_math && (args[i] & MATHLIB) && library > 0)
+	{
+	  --j;
+	  saw_math = &decoded_options[i];
+	}
+
+      if (!saw_thread && (args[i] & THREADLIB) && library > 0)
+	{
+	  --j;
+	  saw_thread = &decoded_options[i];
+	}
+
+      if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
+	{
+	  --j;
+	  saw_libc = &decoded_options[i];
+	}
+
+      if ((args[i] & SKIPOPT) != 0)
+	--j;
+
+      i++;
+      j++;
+    }
+
+  /* Add `-lgo' if we haven't already done so.  */
+  if (library > 0)
+    {
+      generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER,
+		       &new_decoded_options[j]);
+      added_libraries++;
+      j++;
+
+#ifdef HAVE_LD_STATIC_DYNAMIC
+      if (library > 1 && !static_link)
+	{
+	  generate_option (OPT_Wl_, "-Bstatic", 1, CL_DRIVER,
+			   &new_decoded_options[j]);
+	  j++;
+	}
+#endif
+
+      generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1,
+		       CL_DRIVER, &new_decoded_options[j]);
+      added_libraries++;
+      j++;
+
+#ifdef HAVE_LD_STATIC_DYNAMIC
+      if (library > 1 && !static_link)
+	{
+	  generate_option (OPT_Wl_, "-Bdynamic", 1, CL_DRIVER,
+			   &new_decoded_options[j]);
+	  j++;
+	}
+#endif
+
+      /* When linking libgo statically we also need to link with the
+	 pthread library.  */
+      if (library > 1 || static_link)
+	need_thread = 1;
+    }
+
+  if (saw_thread)
+    new_decoded_options[j++] = *saw_thread;
+  else if (library > 0 && need_thread)
+    {
+      generate_option (OPT_l,
+		       (saw_profile_flag
+			? THREAD_LIBRARY_PROFILE
+			: THREAD_LIBRARY),
+		       1, CL_DRIVER, &new_decoded_options[j]);
+      added_libraries++;
+      j++;
+    }
+
+  if (saw_math)
+    new_decoded_options[j++] = *saw_math;
+  else if (library > 0 && need_math)
+    {
+      generate_option (OPT_l,
+		       saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
+		       1, CL_DRIVER, &new_decoded_options[j]);
+      added_libraries++;
+      j++;
+    }
+
+  if (saw_libc)
+    new_decoded_options[j++] = *saw_libc;
+  if (shared_libgcc && !static_link)
+    generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
+		     &new_decoded_options[j++]);
+
+  *in_decoded_options_count = j;
+  *in_decoded_options = new_decoded_options;
+  *in_added_libraries = added_libraries;
+}
+
+/* Called before linking.  Returns 0 on success and -1 on failure.  */
+int lang_specific_pre_link (void)  /* Not used for Go.  */
+{
+  return 0;
+}
+
+/* Number of extra output files that lang_specific_pre_link may generate.  */
+int lang_specific_extra_outfiles = 0;  /* Not used for Go.  */