Tue Mar 12 12:43:59 1996 David Mosberger-Tang <davidm@koala.azstarnet.com>

	* ld.h (ld_config_type): Add warn_multiple_gp field.
	* lexsup.c (parse_args): Handle --warn-multiple-gp.
	* ldmain.c (warning_callback): Suppress multiple gp values warning
	if --warn_multiple_gp was not used.
	* ld.texinfo, ld.1: Document --warn-multiple-gp.

diff --git a/ld/ChangeLog b/ld/ChangeLog
index c0f7c71..89cbc47 100644 (file)
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,11 @@
+Tue Mar 12 12:43:59 1996  David Mosberger-Tang  <davidm@koala.azstarnet.com>
+
+       * ld.h (ld_config_type): Add warn_multiple_gp field.
+       * lexsup.c (parse_args): Handle --warn-multiple-gp.
+       * ldmain.c (warning_callback): Suppress multiple gp values warning
+       if --warn_multiple_gp was not used.
+       * ld.texinfo, ld.1: Document --warn-multiple-gp.
+
 Tue Mar 12 12:02:21 1996  Ian Lance Taylor  <ian@cygnus.com>
 
        * configure: Rebuild with autoconf 2.8.

diff --git a/ld/ld.1 b/ld/ld.1
index a52bf11..802926c 100644 (file)
--- a/ld/ld.1
+++ b/ld/ld.1
@@ -119,6 +119,7 @@ ld \- the GNU linker
 .RB "[\|" \-\-version "\|]"
 .RB "[\|" \-warn\-common "\|]" 
 .RB "[\|" \-warn\-constructors "\|]" 
+.RB "[\|" \-warn\-multiple\-gp "\|]" 
 .RB "[\|" \-warn\-once "\|]" 
 .RB "[\|" \-\-whole\-archive "\|]" 
 .RB "[\|" \-\-no\-whole\-archive "\|]" 
@@ -908,6 +909,11 @@ few object file formats.  For formats like COFF or ELF, the linker can
 not detect the use of global constructors.
 
 .TP
+.B \-warn\-multiple\-gp
+Warn if the output file requires multiple global-pointer values.  This
+option is only meaningful for certain processors, such as the Alpha.
+
+.TP
 .B \-warn\-once
 Only warn once for each undefined symbol, rather than once per module
 which refers to it.

diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index ad8ba4b..23fc78a 100644 (file)
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -184,7 +184,7 @@ ld [ -o @var{output} ]  @var{objfile}@dots{}
   [ -Ttext @var{org} ]  [ -Tdata @var{org} ]
   [ -Tbss @var{org} ]  [ -t ] [ -traditional-format ]
   [ -u @var{symbol}]  [-V]  [-v]  [ -verbose]  [ -version ]
-  [ -warn-common ] [ -warn-constructors] [ -warn-once ]
+  [ -warn-common ] [ -warn-constructors] [ -warn-multiple-gp ] [ -warn-once ]
   [ -y @var{symbol} ]  [ -X ]  [-x ]
   [ -( [ archives ] -) ]
   [ --start-group [ archives ] --end-group ]
@@ -932,6 +932,20 @@ Warn if any global constructors are used.  This is only useful for a few
 object file formats.  For formats like COFF or ELF, the linker can not
 detect the use of global constructors.
 
+@kindex -warn-multiple-gp
+@item -warn-multiple-gp
+Warn if multiple global pointer values are required in the output file.
+This is only meaningful for certain processors, such as the Alpha.
+Specifically, some processors put large-valued constants in a special
+section.  A special register (the global pointer) points into the middle
+of this section, so that constants can be loaded efficiently via a
+base-register relative addressing mode.  Since the offset in
+base-register relative mode is fixed and relatively small (e.g., 16
+bits), this limits the maximum size of the constant pool.  Thus, in
+large programs, it is often necessary to use multiple global pointer
+values in order to be able to address all possible constants.  This
+option causes a warning to be issued whenever this case occurs.
+
 @kindex -warn-once
 @cindex warnings, on undefined symbols
 @cindex undefined symbols, warnings on
@@ -941,6 +955,7 @@ which refers to it.
 
 @kindex --whole-archive
 @cindex including an entire archive
+@item --whole-archive
 For each archive mentioned on the command line after the
 @code{--whole-archive} option, include every object file in the archive
 in the link, rather than searching the archive for the required object
@@ -949,6 +964,7 @@ library, forcing every object to be included in the resulting shared
 library.
 
 @kindex --no-whole-archive
+@item --no-whole-archive
 Turn off the effect of the @code{--whole-archive} option for archives
 which appear later on the command line.
 

diff --git a/ld/ldmain.c b/ld/ldmain.c
index 15fac43..5dbfc55 100644 (file)
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@@ -735,7 +735,7 @@ add_to_set (info, h, reloc, abfd, section, value)
   if (! config.build_constructors)
     return true;
 
-  ldctor_add_set_entry (h, reloc, section, value);
+  ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
 
   if (h->type == bfd_link_hash_new)
     {
@@ -775,7 +775,9 @@ constructor_callback (info, constructor, name, abfd, section, value)
 
   /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
      useful error message.  */
-  if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL)
+  if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
+      && (link_info.relocateable
+         || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
     einfo ("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n");
 
   s = set_name;
@@ -802,7 +804,7 @@ constructor_callback (info, constructor, name, abfd, section, value)
         ourselves.  */
     }
 
-  ldctor_add_set_entry (h, BFD_RELOC_CTOR, section, value);
+  ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
   return true;
 }
 
@@ -829,6 +831,12 @@ warning_callback (info, warning, symbol, abfd, section, address)
      asection *section;
      bfd_vma address;
 {
+  /* This is a hack to support warn_multiple_gp.  FIXME: This should
+     have a cleaner interface, but what?  */
+  if (! config.warn_multiple_gp
+      && strcmp (warning, "using multiple gp values") == 0)
+    return true;
+
   if (section != NULL)
     einfo ("%C: %s\n", abfd, section, address, warning);
   else if (abfd == NULL)

diff --git a/ld/lexsup.c b/ld/lexsup.c
index 1e5d5dc..d90b8c7 100644 (file)
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -1,5 +1,5 @@
 /* Parse options for the GNU linker.
-   Copyright (C) 1991, 92, 93, 94, 1995 Free Software Foundation, Inc.
+   Copyright (C) 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
 
 This file is part of GLD, the Gnu Linker.
 
@@ -103,7 +103,8 @@ parse_args (argc, argv)
 #define OPTION_VERSION                 (OPTION_VERBOSE + 1)
 #define OPTION_WARN_COMMON             (OPTION_VERSION + 1)
 #define OPTION_WARN_CONSTRUCTORS       (OPTION_WARN_COMMON + 1)
-#define OPTION_WARN_ONCE               (OPTION_WARN_CONSTRUCTORS + 1)
+#define OPTION_WARN_MULTIPLE_GP                (OPTION_WARN_CONSTRUCTORS + 1)
+#define OPTION_WARN_ONCE               (OPTION_WARN_MULTIPLE_GP + 1)
 #define OPTION_SPLIT_BY_RELOC          (OPTION_WARN_ONCE + 1)
 #define OPTION_SPLIT_BY_FILE           (OPTION_SPLIT_BY_RELOC + 1)
 #define OPTION_WHOLE_ARCHIVE           (OPTION_SPLIT_BY_FILE + 1)
@@ -159,6 +160,7 @@ parse_args (argc, argv)
     {"version", no_argument, NULL, OPTION_VERSION},
     {"warn-common", no_argument, NULL, OPTION_WARN_COMMON},
     {"warn-constructors", no_argument, NULL, OPTION_WARN_CONSTRUCTORS},
+    {"warn-multiple-gp", no_argument, NULL, OPTION_WARN_MULTIPLE_GP},
     {"warn-once", no_argument, NULL, OPTION_WARN_ONCE},
     {"split-by-reloc", required_argument, NULL, OPTION_SPLIT_BY_RELOC},
     {"split-by-file", no_argument, NULL, OPTION_SPLIT_BY_FILE},
@@ -487,6 +489,9 @@ parse_args (argc, argv)
        case OPTION_WARN_CONSTRUCTORS:
          config.warn_constructors = true;
          break;
+       case OPTION_WARN_MULTIPLE_GP:
+         config.warn_multiple_gp = true;
+         break;
        case OPTION_WARN_ONCE:
          config.warn_once = true;
          break;