* config/alpha/t-vms (EXTRA_PARTS): Append $(VMS_EXTRA_PARTS)

	Add rules for building [vp]crt0.o
	* config/alpha/vms.h (START_FILE_SPEC): Define.
	* config/alpha/x-vms (VMS_EXTRA_PARTS): Define
	* config/alpha/vms-crt0.c, config/alpha/vms-psxcrt0.c: New files.
	* doc/invoke.texi: Document special Alpha/VMS options.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@47831 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 190 insertions, 2 deletions

diff --git a/gcc/config/alpha/t-vms b/gcc/config/alpha/t-vms
index 3b079f0096e..359f6f4668a 100644
--- a/gcc/config/alpha/t-vms
+++ b/gcc/config/alpha/t-vms
@@ -1,7 +1,19 @@
 LIB2FUNCS_EXTRA = $(srcdir)/config/alpha/vms_tramp.asm
-EXTRA_PARTS = vms-dwarf2.o
 
-# This object must be linked in in order to make the executable debuggable.
+# VMS_EXTRA_PARTS is defined in x-vms and represent object files that
+# are only needed for VMS targets, but can only be compiled on a VMS host
+# (because they need DEC C).
+EXTRA_PARTS = vms-dwarf2.o $(VMS_EXTRA_PARTS)
+
+# This object must be linked with in order to make the executable debuggable.
 # vms-ld handles it automatically when passed -g.
 vms-dwarf2.o : $(srcdir)/config/alpha/vms-dwarf2.asm
 	gcc -c -x assembler $<
+
+# Assemble startup files.
+vcrt0.o: $(CRT0_S) $(GCC_PASSES)
+	decc -c /names=as_is $(srcdir)/config/alpha/vms-crt0.c -o vcrt0.o
+
+pcrt0.o: $(CRT0_S) $(GCC_PASSES)
+	decc -c /names=as_is $(srcdir)/config/alpha/vms-psxcrt0.c -o pcrt0.o
+
diff --git a/gcc/config/alpha/vms-crt0.c b/gcc/config/alpha/vms-crt0.c
new file mode 100644
index 00000000000..e75bc02ce74
--- /dev/null
+++ b/gcc/config/alpha/vms-crt0.c
@@ -0,0 +1,71 @@
+/* VMS crt0 returning VMS style condition codes .
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   Contributed by Douglas B. Rupp (rupp@gnat.com).
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#if !defined(__DECC)
+You Lose! This file can only be compiled with DEC C.
+#else
+
+/* This file can only be compiled with DEC C, due the the call to
+   lib$establish. */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ssdef.h>
+
+extern void decc$main ();
+
+extern int main ();
+
+static int
+handler (sigargs, mechargs)
+     void *sigargs;
+     void *mechargs;
+{
+  return SS$_RESIGNAL;
+}
+
+int
+__main (arg1, arg2, arg3, image_file_desc, arg5, arg6)
+     void *arg1, *arg2, *arg3;
+     void *image_file_desc;
+     void *arg5, *arg6;
+{
+  int argc;
+  char **argv;
+  char **envp;
+
+  lib$establish (handler);
+
+  decc$main(arg1, arg2, arg3, image_file_desc, arg5, arg6,
+	    &argc, &argv, &envp);
+
+  return main (argc, argv, envp);
+}
+#endif
diff --git a/gcc/config/alpha/vms-psxcrt0.c b/gcc/config/alpha/vms-psxcrt0.c
new file mode 100644
index 00000000000..cdf5ced843a
--- /dev/null
+++ b/gcc/config/alpha/vms-psxcrt0.c
@@ -0,0 +1,99 @@
+/* VMS crt0 returning Unix style condition codes .
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   Contributed by Douglas B. Rupp (rupp@gnat.com).
+
+This file is part of GNU CC.
+
+GNU CC 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 2, or (at your option)
+any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#if !defined(__DECC)
+You Lose! This file can only be compiled with DEC C.
+#else
+
+/* This file can only be compiled with DEC C, due the the call to
+   lib$establish. */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ssdef.h>
+#include <stsdef.h>
+#include <errnodef.h>
+
+extern void decc$main ();
+extern int main ();
+
+static int
+handler (sigargs, mechargs)
+     void *sigargs;
+     void *mechargs;
+{
+  return SS$_RESIGNAL;
+}
+
+int
+__main (arg1, arg2, arg3, image_file_desc, arg5, arg6)
+     void *arg1, *arg2, *arg3;
+     void *image_file_desc;
+     void *arg5, *arg6;
+{
+  int argc;
+  char **argv;
+  char **envp;
+  int status;
+
+  lib$establish (handler);
+  decc$main (arg1, arg2, arg3, image_file_desc, arg5, arg6,
+	     &argc, &argv, &envp);
+
+  status = main (argc, argv, envp);
+
+  /* Map into a range of 0 - 255.  */
+  status = status & 255;
+
+  if (status > 0)
+    {
+      int save_status = status;
+
+      status = C$_EXIT1 + ((status - 1) << STS$V_MSG_NO);
+
+      /* An exit failure status requires a "severe" error
+	 All status values are defined in errno with a successful
+	 (1) severity but can be changed to an error (2) severity by adding 1.
+	 In addition for compatibility with UNIX exit() routines we inhibit
+	 a run-time error message from being generated on exit(1).  */
+
+      if (save_status == 1)
+	{
+	  status++;
+	  status |= STS$M_INHIB_MSG;
+	}
+    }
+
+  if (status == 0)
+    status = SS$_NORMAL;
+
+  return status;
+}
+#endif
diff --git a/gcc/config/alpha/vms.h b/gcc/config/alpha/vms.h
index c46b94379ee..df7140dce94 100644
--- a/gcc/config/alpha/vms.h
+++ b/gcc/config/alpha/vms.h
@@ -450,6 +450,8 @@ do {									\
 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
 
 #undef STARTFILE_SPEC
+#define STARTFILE_SPEC "%{!shared:%{mvms-return-codes:vcrt0.o%s} \
+%{!mvms-return-codes:pcrt0.o%s}}"
 
 /* Define the names of the division and modulus functions.  */
 #define DIVSI3_LIBCALL "OTS$DIV_I"
diff --git a/gcc/config/alpha/x-vms b/gcc/config/alpha/x-vms
index 49338c152b6..79238a1fa63 100644
--- a/gcc/config/alpha/x-vms
+++ b/gcc/config/alpha/x-vms
@@ -9,3 +9,7 @@ decc.exe : vms-cc.o
 	$(CC) -o $@ vms-cc.o ../libiberty/libiberty.a
 
 EXTRA_PROGRAMS=ld.exe decc.exe
+
+# These extra parts can only be compiled on a VMS host and are only needed
+# on a VMS target.
+VMS_EXTRA_PARTS=vcrt0.o pcrt0.o