PR linker/4844

* genscript.sh: Add support for generating a .xa script for use with the --auto-import option.
* ld.texinfo: Document the new behaviour of the --auto-import option.
* ldint.texinfo: Document new script generation.
* emulparams/i386pe.sh (GENERATE_AUTO_IMPORT): Define.
* emulparams/i386pe_posix.sh (GENERATE_AUTO_IMPORT): Define.
* emulparams/i386pep.sh (GENERATE_AUTO_IMPORT): Define.
* emultemp/pe.em (..._get_script): Support the use of the auto import script.
* scripttempl/pe.sc: Put the .rdata input sections into the .data output section when creating an auto import script.
* scripttempl/pep.sc: Likewise.

ld/ChangeLog

@@ -1,3 +1,20 @@
+2007-10-01  Nick Clifton  <nickc@redhat.com>
+
+	PR linker/4844
+	* genscript.sh: Add support for generating a .xa script for use
+	with the --auto-import option.
+	* ld.texinfo: Document the new behaviour of the --auto-import
+	option.
+	* ldint.texinfo: Document new script generation.
+	* emulparams/i386pe.sh (GENERATE_AUTO_IMPORT): Define.
+	* emulparams/i386pe_posix.sh (GENERATE_AUTO_IMPORT): Define.
+	* emulparams/i386pep.sh (GENERATE_AUTO_IMPORT): Define.
+	* emultemp/pe.em (..._get_script): Support the use of the auto
+	import script.
+	* scripttempl/pe.sc: Put the .rdata input sections into the .data
+	output section when creating an auto import script.
+	* scripttempl/pep.sc: Likewise.
+
 2007-09-26  Brian Watt  <bwatt@us.ibm.com>
 
 	* emultempl/spu_ovl.S: Add debug printf code.

ld/emulparams/i386pe.sh

@@ -7,3 +7,4 @@ ENTRY="_mainCRTStartup"
 SUBSYSTEM=PE_DEF_SUBSYSTEM
 INITIAL_SYMBOL_CHAR=\"_\"
 TARGET_PAGE_SIZE=0x1000
+GENERATE_AUTO_IMPORT_SCRIPT=1

ld/emulparams/i386pe_posix.sh

@@ -8,3 +8,4 @@ SUBSYSTEM=7
 EXECUTABLE_NAME=a.out
 INITIAL_SYMBOL_CHAR=\"_\"
 TARGET_PAGE_SIZE=0x1000
+GENERATE_AUTO_IMPORT_SCRIPT=1

ld/emulparams/i386pep.sh

@@ -7,3 +7,4 @@ ENTRY="_mainCRTStartup"
 SUBSYSTEM=PE_DEF_SUBSYSTEM
 INITIAL_SYMBOL_CHAR=\"_\"
 TARGET_PAGE_SIZE=0x1000
+GENERATE_AUTO_IMPORT_SCRIPT=1

ld/emultempl/pe.em

@@ -1891,6 +1891,10 @@ echo '  ; else if (!config.text_read_only) return'	>> e${EMULATION_NAME}.c
 sed $sc ldscripts/${EMULATION_NAME}.xbn			>> e${EMULATION_NAME}.c
 echo '  ; else if (!config.magic_demand_paged) return'	>> e${EMULATION_NAME}.c
 sed $sc ldscripts/${EMULATION_NAME}.xn			>> e${EMULATION_NAME}.c
+if test -n "$GENERATE_AUTO_IMPORT_SCRIPT" ; then
+echo '  ; else if (link_info.pei386_auto_import == 1) return'	>> e${EMULATION_NAME}.c
+sed $sc ldscripts/${EMULATION_NAME}.xa			>> e${EMULATION_NAME}.c
+fi
 echo '  ; else return'					>> e${EMULATION_NAME}.c
 sed $sc ldscripts/${EMULATION_NAME}.x			>> e${EMULATION_NAME}.c
 echo '; }'						>> e${EMULATION_NAME}.c

ld/emultempl/pep.em

@@ -1659,6 +1659,10 @@ echo '  ; else if (!config.text_read_only) return'	>> e${EMULATION_NAME}.c
 sed $sc ldscripts/${EMULATION_NAME}.xbn			>> e${EMULATION_NAME}.c
 echo '  ; else if (!config.magic_demand_paged) return'	>> e${EMULATION_NAME}.c
 sed $sc ldscripts/${EMULATION_NAME}.xn			>> e${EMULATION_NAME}.c
+if test -n "$GENERATE_AUTO_IMPORT_SCRIPT" ; then
+echo '  ; else if (link_info.pei386_auto_import == 1) return'	>> e${EMULATION_NAME}.c
+sed $sc ldscripts/${EMULATION_NAME}.xa			>> e${EMULATION_NAME}.c
+fi
 echo '  ; else return'					>> e${EMULATION_NAME}.c
 sed $sc ldscripts/${EMULATION_NAME}.x			>> e${EMULATION_NAME}.c
 echo '; }'						>> e${EMULATION_NAME}.c

ld/genscripts.sh

@@ -63,6 +63,7 @@
 #   sun3.xc      [used when the linker is invoked with "-z combreloc"]
 #   sun3.xsc     [used when the linker is invoked with "--shared"]
 #   sun3.xdc     [used when the linker is invoked with "-pie"]
+#   sun3.xa      [used when the linker is invoked with "--enable-auto-import"]
 #
 # It also produced the C source file:
 #
@@ -386,6 +387,16 @@ if test -n "$GENERATE_PIE_SCRIPT"; then
   unset CREATE_PIE
 fi
 
+if test -n "$GENERATE_AUTO_IMPORT_SCRIPT"; then
+  LD_FLAG=auto_import
+  DATA_ALIGNMENT=${DATA_ALIGNMENT_}
+  (
+    echo "/* Script for ld --enable-auto-import: Like the default script except read only data is placed into .data  */"
+    . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
+    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xa
+fi
+
 case " $EMULATION_LIBPATH " in
     *" ${EMULATION_NAME} "*) COMPILE_IN=true;;
 esac

ld/ld.texinfo

@@ -1568,15 +1568,15 @@ at link time. Searching @option{-rpath} in this way is only supported
 by native linkers and cross linkers which have been configured with
 the @option{--with-sysroot} option.
 @item
-On an ELF system, if the @option{-rpath} and @code{rpath-link} options
+On an ELF system, for native linkers, if the @option{-rpath} and
-were not used, search the contents of the environment variable
+@option{-rpath-link} options were not used, search the contents of the
-@code{LD_RUN_PATH}. It is for the native linker only.
+environment variable @code{LD_RUN_PATH}.
 @item
 On SunOS, if the @option{-rpath} option was not used, search any
 directories specified using @option{-L} options.
 @item
-For a native linker, the contents of the environment variable
+For a native linker, the search the contents of the environment
-@code{LD_LIBRARY_PATH}.
+variable @code{LD_LIBRARY_PATH}.
 @item
 For a native ELF linker, the directories in @code{DT_RUNPATH} or
 @code{DT_RPATH} of a shared library are searched for shared
@@ -2220,6 +2220,12 @@ building the import libraries with those DATA exports. Note: Use of the
 to be made writable. This does not conform to the PE-COFF format
 specification published by Microsoft.
 
+Note - use of the 'auto-import' extension will also cause read only
+data which would normally be placed into the .rdata section to be
+placed into the .data section instead.  This is in order to work
+around a problem with consts that is described here:
+http://www.cygwin.com/ml/cygwin/2004-09/msg01101.html
+
 Using 'auto-import' generally will 'just work' -- but sometimes you may
 see this message:
 

ld/ldint.texinfo

@@ -237,7 +237,7 @@ If @code{SCRIPT_NAME} is set to @var{script}, @code{genscripts.sh} will
 invoke @file{scripttempl/@var{script}.sc}.
 
 The @file{genscripts.sh} script will invoke the @file{scripttempl}
-script 5 to 8 times.  Each time it will set the shell variable
+script 5 to 9 times.  Each time it will set the shell variable
 @code{LD_FLAG} to a different value.  When the linker is run, the
 options used will direct it to select a particular script.  (Script
 selection is controlled by the @code{get_script} emulation entry point;
@@ -292,6 +292,13 @@ this value if @code{GENERATE_COMBRELOC_SCRIPT} is defined in the
 The @file{emultempl} script must arrange to use this script at the
 appropriate time, normally when the linker is invoked with the @code{-shared
 -z combreloc} option.  The output has an extension of @file{.xsc}.
+@item auto_import
+The @file{scripttempl} script is only invoked with @code{LD_FLAG} set to
+this value if @code{GENERATE_AUTO_IMPORT_SCRIPT} is defined in the
+@file{emulparams} file.  The @file{emultempl} script must arrange to
+use this script at the appropriate time, normally when the linker is
+invoked with the @code{--enable-auto-import} option.  The output has
+an extension of @file{.xa}.
 @end table
 
 Besides the shell variables set by the @file{emulparams} script, and the

ld/scripttempl/pe.sc

@@ -13,8 +13,16 @@ fi
 # use grouped sections instead).
 if test "${RELOCATING}"; then
   R_TEXT='*(SORT(.text$*))'
+  if test "x$LD_FLAG" = "xauto_import" ; then
+    R_DATA='*(SORT(.data$*))
+            *(.rdata)
+	    *(SORT(.rdata$*))'
+    R_RDATA=''
+  else
     R_DATA='*(SORT(.data$*))'
-  R_RDATA='*(SORT(.rdata$*))'
+    R_RDATA='*(.rdata)
+             *(SORT(.rdata$*))'
+  fi
   R_IDATA='
     SORT(*)(.idata$2)
     SORT(*)(.idata$3)
@@ -37,7 +45,7 @@ if test "${RELOCATING}"; then
 else
   R_TEXT=
   R_DATA=
-  R_RDATA=
+  R_RDATA='*(.rdata)'
   R_IDATA=
   R_CRT=
   R_RSRC=
@@ -93,7 +101,6 @@ SECTIONS
 
   .rdata ${RELOCATING+BLOCK(__section_alignment__)} :
   {
-    *(.rdata)
     ${R_RDATA}
     ${RELOCATING+ *(.eh_frame)}
     ${RELOCATING+___RUNTIME_PSEUDO_RELOC_LIST__ = .;}

ld/scripttempl/pep.sc

@@ -13,8 +13,16 @@ fi
 # use grouped sections instead).
 if test "${RELOCATING}"; then
   R_TEXT='*(SORT(.text$*))'
+  if test "x$LD_FLAG" = "xauto_import" ; then
+    R_DATA='*(SORT(.data$*))
+            *(.rdata)
+	    *(SORT(.rdata$*))'
+    R_RDATA=''
+  else
     R_DATA='*(SORT(.data$*))'
-  R_RDATA='*(SORT(.rdata$*))'
+    R_RDATA='*(.rdata)
+             *(SORT(.rdata$*))'
+  fi
   R_IDATA='
     SORT(*)(.idata$2)
     SORT(*)(.idata$3)
@@ -37,7 +45,7 @@ if test "${RELOCATING}"; then
 else
   R_TEXT=
   R_DATA=
-  R_RDATA=
+  R_RDATA='*(.rdata)'
   R_IDATA=
   R_CRT=
   R_RSRC=
@@ -93,7 +101,6 @@ SECTIONS
 
   .rdata ${RELOCATING+BLOCK(__section_alignment__)} :
   {
-    *(.rdata)
     ${R_RDATA}
     ${RELOCATING+ *(.eh_frame)}
     ${RELOCATING+___RUNTIME_PSEUDO_RELOC_LIST__ = .;}