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Message-ID:	<00fd01c11340$d0a51900$806410ac@local>
From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>,
	<cygwin-apps AT cygwin DOT com>
Cc:	"Charles S. Wilson" <cwilson AT ece DOT gatech DOT edu>
References:	<00de01c1133a$23521f60$806410ac AT local>
Subject:	Re: ld non-relocatable
Date:	Mon, 23 Jul 2001 16:29:08 +1000
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Concept-patch. It removes the .reloc section quite happily.

I don't know whether this will produce faster code - as all the relocation
logic is presumably still in the machinecode. However, it should guarantee
fork() :].

Charles - care to add this to your testing pile? The new
parameter --no-relocate needs to be added to the cygwin .dll link line (for
somewhat obvious reasons :]).


Rob

----- Original Message -----
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: <cygwin-apps AT cygwin DOT com>
Sent: Monday, July 23, 2001 3:40 PM
Subject: ld non-relocatable


> Chuck - excellent sleuthing.
>
> I'll have a quick look now at getting ld to omit the .reloc section(s).
>
> Rob
>
>

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? no-relocate.patch=0A=
Index: pe-dll.c=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
RCS file: /cvs/src/src/ld/pe-dll.c,v=0A=
retrieving revision 1.23=0A=
diff -u -p -r1.23 pe-dll.c=0A=
--- pe-dll.c	2001/03/13 06:14:27	1.23=0A=
+++ pe-dll.c	2001/07/23 06:23:21=0A=
@@ -63,6 +63,7 @@ int pe_dll_kill_ats =3D 0;=0A=
 int pe_dll_stdcall_aliases =3D 0;=0A=
 int pe_dll_warn_dup_exports =3D 0;=0A=
 int pe_dll_compat_implib =3D 0;=0A=
+int pe_dll_no_relocate =3D 0; =0A=
=0A=
 =
/************************************************************************=0A=
 =0A=
@@ -484,6 +485,7 @@ build_filler_bfd (include_edata)=0A=
      int include_edata;=0A=
 {=0A=
   lang_input_statement_type *filler_file;=0A=
+=0A=
   filler_file =3D lang_add_input_file ("dll stuff",=0A=
 				     lang_input_file_is_fake_enum,=0A=
 				     NULL);=0A=
@@ -517,7 +519,7 @@ build_filler_bfd (include_edata)=0A=
   reloc_s =3D bfd_make_section_old_way (filler_bfd, ".reloc");=0A=
   if (reloc_s =3D=3D NULL=0A=
       || !bfd_set_section_flags (filler_bfd, reloc_s,=0A=
-				 (SEC_HAS_CONTENTS=0A=
+	  			 (SEC_HAS_CONTENTS=0A=
 				  | SEC_ALLOC=0A=
 				  | SEC_LOAD=0A=
 				  | SEC_KEEP=0A=
@@ -1914,6 +1916,14 @@ pe_dll_fill_sections (abfd, info)=0A=
 =0A=
   edata_s->contents =3D edata_d;=0A=
   reloc_s->contents =3D reloc_d;=0A=
+=0A=
+  /* if it's not used, remove the reloc setion. =0A=
+   * A better way would be to avoid all the relocation calculations =
earlier=0A=
+   * as it might allow faster execution?=0A=
+   * Ditto for the import library=0A=
+   */=0A=
+  if (pe_dll_no_relocate)=0A=
+    _bfd_strip_section_from_output (info, reloc_s);=0A=
 }=0A=
 =0A=
 void=0A=
Index: pe-dll.h=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
RCS file: /cvs/src/src/ld/pe-dll.h,v=0A=
retrieving revision 1.3=0A=
diff -u -p -r1.3 pe-dll.h=0A=
--- pe-dll.h	2001/03/13 06:14:27	1.3=0A=
+++ pe-dll.h	2001/07/23 06:23:21=0A=
@@ -33,6 +33,7 @@ extern int pe_dll_kill_ats;=0A=
 extern int pe_dll_stdcall_aliases;=0A=
 extern int pe_dll_warn_dup_exports;=0A=
 extern int pe_dll_compat_implib;=0A=
+extern int pe_dll_no_relocate;=0A=
 =0A=
 extern void pe_dll_id_target PARAMS ((const char *));=0A=
 extern void pe_dll_add_excludes PARAMS ((const char *));=0A=
Index: emultempl/pe.em=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
RCS file: /cvs/src/src/ld/emultempl/pe.em,v=0A=
retrieving revision 1.45=0A=
diff -u -p -r1.45 pe.em=0A=
--- pe.em	2001/07/11 08:11:16	1.45=0A=
+++ pe.em	2001/07/23 06:23:22=0A=
@@ -191,6 +191,7 @@ gld_${EMULATION_NAME}_before_parse()=0A=
 #define OPTION_DISABLE_AUTO_IMAGE_BASE	(OPTION_ENABLE_AUTO_IMAGE_BASE + =
1)=0A=
 #define OPTION_DLL_SEARCH_PREFIX	(OPTION_DISABLE_AUTO_IMAGE_BASE + 1)=0A=
 #define OPTION_NO_DEFAULT_EXCLUDES	(OPTION_DLL_SEARCH_PREFIX + 1)=0A=
+#define OPTION_NO_RELOCATE		(OPTION_NO_DEFAULT_EXCLUDES +1)=0A=
 =0A=
 static struct option longopts[] =3D {=0A=
   /* PE options */=0A=
@@ -228,6 +229,7 @@ static struct option longopts[] =3D {=0A=
   {"disable-auto-image-base", no_argument, NULL, =
OPTION_DISABLE_AUTO_IMAGE_BASE},=0A=
   {"dll-search-prefix", required_argument, NULL, =
OPTION_DLL_SEARCH_PREFIX},=0A=
   {"no-default-excludes", no_argument, NULL, =
OPTION_NO_DEFAULT_EXCLUDES},=0A=
+  {"no-relocate", no_argument, NULL, OPTION_NO_RELOCATE},=0A=
 #endif=0A=
   {NULL, no_argument, NULL, 0}=0A=
 };=0A=
@@ -313,6 +315,7 @@ gld_${EMULATION_NAME}_list_options (file=0A=
   fprintf (file, _("  --dll-search-prefix=3D<string>       When linking =
dynamically to a dll witout an\n"));=0A=
   fprintf (file, _("                                       importlib, =
use <string><basename>.dll \n"));=0A=
   fprintf (file, _("                                       in =
preference to lib<basename>.dll \n"));=0A=
+  fprintf (file, _("  --no-relocate                      Generate a =
non-relocatable dll. \n"));=0A=
 #endif=0A=
 }=0A=
 =0A=
@@ -582,6 +585,9 @@ gld_${EMULATION_NAME}_parse_args(argc, a=0A=
       break;=0A=
     case OPTION_NO_DEFAULT_EXCLUDES:=0A=
       pe_dll_do_default_excludes =3D 0;=0A=
+      break;=0A=
+    case OPTION_NO_RELOCATE:=0A=
+      pe_dll_no_relocate =3D 1;=0A=
       break;=0A=
 #endif=0A=
     }=0A=

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