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authorNick Clifton <nickc@redhat.com>2009-07-23 13:00:30 +0000
committerNick Clifton <nickc@redhat.com>2009-07-23 13:00:30 +0000
commit3e7a7d11f1106a451c26b49fcb8fafb5059fd684 (patch)
treeb3d0c290c25b650e408ec3f60e770f56bb1f5be6
parent6ec8e7022b6b6a69ee682d1797e8bfec473aae11 (diff)
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* config/obj-elf.c (obj_elf_type): Add code to support a type of
gnu_unique_object. * doc/as.texinfo: Document new feature of .type directive. * NEWS: Mention support for gnu_unique_object symbol type. * common.h (STB_GNU_UNIQUE): Define. * NEWS: Mention the linker's support for symbols with a binding of STB_GNU_UNIQUE. * gas/elf/type.s: Add unique global symbol definition. * gas/elf/type.e: Add expected readelf output for global unique symbol. * elfcpp.h (enum STB): Add STB_GNU_UNIQUE. * readelf.c (get_symbol_binding): For Linux targeted files return UNIQUE for symbols with the STB_GNU_UNIQUE binding. * doc/binutils.texi: Document the meaning of the 'u' symbol binding in the output of nm and objdump --syms. * elf-bfd.h (struct elf_link_hash_entry): Add unique_global field. * elf.c (swap_out_syms): Set binding to STB_GNU_UNIQUE for symbols with the BSF_GNU_UNIQUE flag bit set. * elfcode.h (elf_slurp_symbol_table): Set the BSF_GNU_UNIQUE flag for symbols with STB_GNU_UNIQUE binding. * elflink.c (_bfd_elf_merge_symbol): Set unique_global for symbols with the STB_GNU_UNIQUE binding. (elf_link_add_object_symbols): Set the BSF_GNU_UNIQUE flag for symbols with STB_GNU_UNIQUE binding. Set STB_GNU_UNIQUE for symbols with the unique_global field set. (elf_link_output_extsym): Set unique_global field for symbols with the STB_GNU_UNIQUE binding. * syms.c (struct bfd_symbol): Define BSF_GNU_UNIQUE flag bit. (bfd_print_symbol_vandf): Print a 'u' character for BSF_GNU_UNIQUE symbols. (bfd_decode_symclass): Return a 'u' character for BSF_GNU_UNIQUE symbols. * bfd-in2.h: Regenerate.
-rw-r--r--bfd/ChangeLog21
-rw-r--r--bfd/bfd-in2.h4
-rw-r--r--bfd/elf-bfd.h2
-rw-r--r--bfd/elf.c2
-rw-r--r--bfd/elfcode.h5
-rw-r--r--bfd/elflink.c32
-rw-r--r--bfd/syms.c9
-rw-r--r--binutils/ChangeLog7
-rw-r--r--binutils/doc/binutils.texi23
-rw-r--r--binutils/readelf.c9
-rw-r--r--elfcpp/ChangeLog4
-rw-r--r--elfcpp/elfcpp.h1
-rw-r--r--gas/ChangeLog7
-rw-r--r--gas/NEWS4
-rw-r--r--gas/config/obj-elf.c16
-rw-r--r--gas/doc/as.texinfo5
-rw-r--r--gas/testsuite/ChangeLog6
-rw-r--r--gas/testsuite/gas/elf/type.e1
-rw-r--r--gas/testsuite/gas/elf/type.s11
-rw-r--r--include/elf/ChangeLog4
-rw-r--r--include/elf/common.h3
-rw-r--r--ld/ChangeLog5
-rw-r--r--ld/NEWS4
23 files changed, 167 insertions, 18 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 7987bbc..42dd8e3 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,24 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * elf-bfd.h (struct elf_link_hash_entry): Add unique_global field.
+ * elf.c (swap_out_syms): Set binding to STB_GNU_UNIQUE for symbols
+ with the BSF_GNU_UNIQUE flag bit set.
+ * elfcode.h (elf_slurp_symbol_table): Set the BSF_GNU_UNIQUE flag
+ for symbols with STB_GNU_UNIQUE binding.
+ * elflink.c (_bfd_elf_merge_symbol): Set unique_global for symbols
+ with the STB_GNU_UNIQUE binding.
+ (elf_link_add_object_symbols): Set the BSF_GNU_UNIQUE flag for
+ symbols with STB_GNU_UNIQUE binding. Set STB_GNU_UNIQUE for
+ symbols with the unique_global field set.
+ (elf_link_output_extsym): Set unique_global field for symbols with
+ the STB_GNU_UNIQUE binding.
+ * syms.c (struct bfd_symbol): Define BSF_GNU_UNIQUE flag bit.
+ (bfd_print_symbol_vandf): Print a 'u' character for BSF_GNU_UNIQUE
+ symbols.
+ (bfd_decode_symclass): Return a 'u' character for BSF_GNU_UNIQUE
+ symbols.
+ * bfd-in2.h: Regenerate.
+
2009-07-22 H.J. Lu <hongjiu.lu@intel.com>
* elflink.c (elf_link_output_extsym): Revert the last change.
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 5244b9a..562f833 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -4639,6 +4639,10 @@ typedef struct bfd_symbol
calling the function that it points to. BSF_FUNCTION must
also be also set. */
#define BSF_GNU_INDIRECT_FUNCTION (1 << 22)
+ /* This symbol is a globally unique data object. The dynamic linker
+ will make sure that in the entire process there is just one symbol
+ with this name and type in use. BSF_OBJECT must also be set. */
+#define BSF_GNU_UNIQUE (1 << 23)
flagword flags;
diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index 1690def..8f70d79 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -178,6 +178,8 @@ struct elf_link_hash_entry
/* Symbol is referenced with a relocation where C/C++ pointer equality
matters. */
unsigned int pointer_equality_needed : 1;
+ /* Symbol is a unique global symbol. */
+ unsigned int unique_global : 1;
/* String table index in .dynstr if this is a dynamic symbol. */
unsigned long dynstr_index;
diff --git a/bfd/elf.c b/bfd/elf.c
index 19f2684..f27c607 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -6446,6 +6446,8 @@ Unable to find equivalent output section for symbol '%s' from section '%s'"),
if (flags & BSF_LOCAL)
bind = STB_LOCAL;
+ else if (flags & BSF_GNU_UNIQUE)
+ bind = STB_GNU_UNIQUE;
else if (flags & BSF_WEAK)
bind = STB_WEAK;
else if (flags & BSF_GLOBAL)
diff --git a/bfd/elfcode.h b/bfd/elfcode.h
index 024ead4..10aa131 100644
--- a/bfd/elfcode.h
+++ b/bfd/elfcode.h
@@ -1,6 +1,6 @@
/* ELF executable support for BFD.
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
@@ -1282,6 +1282,9 @@ elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic)
case STB_WEAK:
sym->symbol.flags |= BSF_WEAK;
break;
+ case STB_GNU_UNIQUE:
+ sym->symbol.flags |= BSF_GNU_UNIQUE;
+ break;
}
switch (ELF_ST_TYPE (isym->st_info))
diff --git a/bfd/elflink.c b/bfd/elflink.c
index f9b577c..a117063 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -1248,6 +1248,9 @@ _bfd_elf_merge_symbol (bfd *abfd,
oldweak = (h->root.type == bfd_link_hash_defweak
|| h->root.type == bfd_link_hash_undefweak);
+ if (bind == STB_GNU_UNIQUE)
+ h->unique_global = 1;
+
/* If a new weak symbol definition comes from a regular file and the
old symbol comes from a dynamic library, we treat the new one as
strong. Similarly, an old weak symbol definition from a regular
@@ -3871,24 +3874,31 @@ error_free_dyn:
common = bed->common_definition (isym);
bind = ELF_ST_BIND (isym->st_info);
- if (bind == STB_LOCAL)
+ switch (bind)
{
+ case STB_LOCAL:
/* This should be impossible, since ELF requires that all
global symbols follow all local symbols, and that sh_info
point to the first global symbol. Unfortunately, Irix 5
screws this up. */
continue;
- }
- else if (bind == STB_GLOBAL)
- {
+
+ case STB_GLOBAL:
if (isym->st_shndx != SHN_UNDEF && !common)
flags = BSF_GLOBAL;
- }
- else if (bind == STB_WEAK)
- flags = BSF_WEAK;
- else
- {
+ break;
+
+ case STB_WEAK:
+ flags = BSF_WEAK;
+ break;
+
+ case STB_GNU_UNIQUE:
+ flags = BSF_GNU_UNIQUE;
+ break;
+
+ default:
/* Leave it up to the processor backend. */
+ break;
}
if (isym->st_shndx == SHN_UNDEF)
@@ -4140,7 +4150,9 @@ error_free_dyn:
while (h->root.type == bfd_link_hash_indirect
|| h->root.type == bfd_link_hash_warning)
h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
*sym_hash = h;
+ h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
new_weakdef = FALSE;
if (dynamic
@@ -8571,6 +8583,8 @@ elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
sym.st_other = h->other;
if (h->forced_local)
sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
+ else if (h->unique_global)
+ sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
else if (h->root.type == bfd_link_hash_undefweak
|| h->root.type == bfd_link_hash_defweak)
sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
diff --git a/bfd/syms.c b/bfd/syms.c
index 6abb929..e4258b5 100644
--- a/bfd/syms.c
+++ b/bfd/syms.c
@@ -302,6 +302,10 @@ CODE_FRAGMENT
. calling the function that it points to. BSF_FUNCTION must
. also be also set. *}
.#define BSF_GNU_INDIRECT_FUNCTION (1 << 22)
+. {* This symbol is a globally unique data object. The dynamic linker
+. will make sure that in the entire process there is just one symbol
+. with this name and type in use. BSF_OBJECT must also be set. *}
+.#define BSF_GNU_UNIQUE (1 << 23)
.
. flagword flags;
.
@@ -485,7 +489,8 @@ bfd_print_symbol_vandf (bfd *abfd, void *arg, asymbol *symbol)
fprintf (file, " %c%c%c%c%c%c%c",
((type & BSF_LOCAL)
? (type & BSF_GLOBAL) ? '!' : 'l'
- : (type & BSF_GLOBAL) ? 'g' : ' '),
+ : (type & BSF_GLOBAL) ? 'g'
+ : (type & BSF_GNU_UNIQUE) ? 'u' : ' '),
(type & BSF_WEAK) ? 'w' : ' ',
(type & BSF_CONSTRUCTOR) ? 'C' : ' ',
(type & BSF_WARNING) ? 'W' : ' ',
@@ -686,6 +691,8 @@ bfd_decode_symclass (asymbol *symbol)
else
return 'W';
}
+ if (symbol->flags & BSF_GNU_UNIQUE)
+ return 'u';
if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL)))
return '?';
diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 89b1a66..28caa23 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,10 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * readelf.c (get_symbol_binding): For Linux targeted files return
+ UNIQUE for symbols with the STB_GNU_UNIQUE binding.
+ * doc/binutils.texi: Document the meaning of the 'u' symbol
+ binding in the output of nm and objdump --syms.
+
2009-07-20 H.J. Lu <hongjiu.lu@intel.com>
* NEWS: Mention --insn-width.
diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 98438f2..a5856b2 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -745,7 +745,13 @@ object file formats permit more efficient access to small data objects,
such as a global int variable as opposed to a large global array.
@item i
-The symbol is in a section specific to the implementation of DLLs.
+For PE format files this indicates that the symbol is in a section
+specific to the implementation of DLLs. For ELF format files this
+indicates that the symbol is an indirect function. This is a GNU
+extension to the standard set of ELF symbol types. It indicates a
+symbol which if referenced by a relocation does not evaluate to its
+address, but instead must be invoked at runtime. The runtime
+execution will then return the value to be used in the relocation.
@item N
The symbol is a debugging symbol.
@@ -768,6 +774,12 @@ The symbol is in the text (code) section.
@item U
The symbol is undefined.
+@item u
+The symbol is a unique global symbol. This is a GNU extension to the
+standard set of ELF symbol bindings. For such a symbol the dynamic linker
+will make sure that in the entire process there is just one symbol with
+this name and type in use.
+
@item V
@itemx v
The symbol is a weak object. When a weak defined symbol is linked with
@@ -2142,11 +2154,16 @@ The flag characters are divided into 7 groups as follows:
@table @code
@item l
@itemx g
+@itemx u
@itemx !
-The symbol is local (l), global (g), neither (a space) or both (!). A
+The symbol is a local (l), global (g), unique global (u), neither
+global nor local (a space) or both global and local (!). A
symbol can be neither local or global for a variety of reasons, e.g.,
because it is used for debugging, but it is probably an indication of
-a bug if it is ever both local and global.
+a bug if it is ever both local and global. Unique global symbols are
+a GNU extension to the standard set of ELF symbol bindings. For such
+a symbol the dynamic linker will make sure that in the entire process
+there is just one symbol with this name and type in use.
@item w
The symbol is weak (w) or strong (a space).
diff --git a/binutils/readelf.c b/binutils/readelf.c
index ce739e6..f56e6c2 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -6902,7 +6902,14 @@ get_symbol_binding (unsigned int binding)
snprintf (buff, sizeof (buff), _("<processor specific>: %d"),
binding);
else if (binding >= STB_LOOS && binding <= STB_HIOS)
- snprintf (buff, sizeof (buff), _("<OS specific>: %d"), binding);
+ {
+ if (binding == STB_GNU_UNIQUE
+ && (elf_header.e_ident[EI_OSABI] == ELFOSABI_LINUX
+ /* GNU/Linux is still using the default value 0. */
+ || elf_header.e_ident[EI_OSABI] == ELFOSABI_NONE))
+ return "UNIQUE";
+ snprintf (buff, sizeof (buff), _("<OS specific>: %d"), binding);
+ }
else
snprintf (buff, sizeof (buff), _("<unknown>: %d"), binding);
return buff;
diff --git a/elfcpp/ChangeLog b/elfcpp/ChangeLog
index 2a8204f..2a668a6 100644
--- a/elfcpp/ChangeLog
+++ b/elfcpp/ChangeLog
@@ -1,3 +1,7 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * elfcpp.h (enum STB): Add STB_GNU_UNIQUE.
+
2009-06-21 Ian Lance Taylor <iant@google.com>
* elfcpp.h (SHN_X86_64_LCOMMON): Define enum constant.
diff --git a/elfcpp/elfcpp.h b/elfcpp/elfcpp.h
index 1b1a875..683cd9d 100644
--- a/elfcpp/elfcpp.h
+++ b/elfcpp/elfcpp.h
@@ -485,6 +485,7 @@ enum STB
STB_GLOBAL = 1,
STB_WEAK = 2,
STB_LOOS = 10,
+ STB_GNU_UNIQUE = 10,
STB_HIOS = 12,
STB_LOPROC = 13,
STB_HIPROC = 15
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 8f150fc..de98024 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,10 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * config/obj-elf.c (obj_elf_type): Add code to support a type of
+ gnu_unique_object.
+ * doc/as.texinfo: Document new feature of .type directive.
+ * NEWS: Mention support for gnu_unique_object symbol type.
+
2009-07-23 Nick Clifton <nickc@redhat.com>
PR binutils/10379
diff --git a/gas/NEWS b/gas/NEWS
index 529f4ab..c2eea84 100644
--- a/gas/NEWS
+++ b/gas/NEWS
@@ -1,4 +1,8 @@
-*- text -*-
+* GNU/Linux targets now supports "gnu_unique_object" as a value in the .type
+ pseudo op. It marks the symbol as being globally unique in the entire
+ process.
+
* ARM assembler now supports .inst[.nw] pseudo-ops to insert opcodes specified
in binary rather than text.
diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c
index 3c72326..c9c7a9c 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -1665,8 +1665,8 @@ obj_elf_type (int ignore ATTRIBUTE_UNUSED)
}
}
else if (strcmp (typename, "gnu_indirect_function") == 0
- || strcmp (typename, "10") == 0
- || strcmp (typename, "STT_GNU_IFUNC") == 0)
+ || strcmp (typename, "10") == 0
+ || strcmp (typename, "STT_GNU_IFUNC") == 0)
{
const struct elf_backend_data *bed;
@@ -1678,6 +1678,18 @@ obj_elf_type (int ignore ATTRIBUTE_UNUSED)
typename);
type = BSF_FUNCTION | BSF_GNU_INDIRECT_FUNCTION;
}
+ else if (strcmp (typename, "gnu_unique_object") == 0)
+ {
+ const struct elf_backend_data *bed;
+
+ bed = get_elf_backend_data (stdoutput);
+ if (!(bed->elf_osabi == ELFOSABI_LINUX
+ /* GNU/Linux is still using the default value 0. */
+ || bed->elf_osabi == ELFOSABI_NONE))
+ as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
+ typename);
+ type = BSF_OBJECT | BSF_GNU_UNIQUE;
+ }
#ifdef md_elf_symbol_type
else if ((type = md_elf_symbol_type (typename, sym, elfsym)) != -1)
;
diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo
index d1240bf..3af86f8 100644
--- a/gas/doc/as.texinfo
+++ b/gas/doc/as.texinfo
@@ -6360,6 +6360,11 @@ Mark the symbol as being a common data object.
@itemx notype
Does not mark the symbol in any way. It is supported just for completeness.
+@item gnu_unique_object
+Marks the symbol as being a globally unique data object. The dynamic linker
+will make sure that in the entire process there is just one symbol with this
+name and type in use. (This is only supported on Linux targeted assemblers).
+
@end table
Note: Some targets support extra types in addition to those listed above.
diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog
index a5d0bdb..a30164b 100644
--- a/gas/testsuite/ChangeLog
+++ b/gas/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * gas/elf/type.s: Add unique global symbol definition.
+ * gas/elf/type.e: Add expected readelf output for global unique
+ symbol.
+
2009-07-21 H.J. Lu <hongjiu.lu@intel.com>
PR gas/10420
diff --git a/gas/testsuite/gas/elf/type.e b/gas/testsuite/gas/elf/type.e
index 95d846a..2d26af8 100644
--- a/gas/testsuite/gas/elf/type.e
+++ b/gas/testsuite/gas/elf/type.e
@@ -3,4 +3,5 @@
.: 0+0 1 OBJECT LOCAL DEFAULT . object
.: 0+1 1 TLS LOCAL DEFAULT . tls_object
..: 0+2 1 NOTYPE LOCAL DEFAULT . notype
+ ..: 0+3 1 OBJECT UNIQUE DEFAULT . unique_global
..: 0+1 1 (COMMON|OBJECT) GLOBAL DEFAULT COM common
diff --git a/gas/testsuite/gas/elf/type.s b/gas/testsuite/gas/elf/type.s
index 8620cc2..159bf6d 100644
--- a/gas/testsuite/gas/elf/type.s
+++ b/gas/testsuite/gas/elf/type.s
@@ -1,24 +1,35 @@
.text
+
.size function,1
.type function,%function
function:
.byte 0x0
+
.size indirect_function,1
.type indirect_function,%gnu_indirect_function
indirect_function:
.byte 0x0
+
.data
+
.type object,%object
.size object,1
object:
.byte 0x0
.type tls_object,%tls_object
+
.size tls_object,1
tls_object:
.byte 0x0
.type notype,%notype
+
.size notype,1
notype:
.byte 0x0
.comm common, 1
.type common,STT_COMMON
+
+ .type unique_global,%gnu_unique_object
+unique_global:
+ .byte 0x0
+ .size unique_global,1
diff --git a/include/elf/ChangeLog b/include/elf/ChangeLog
index 89235d1..600342c 100644
--- a/include/elf/ChangeLog
+++ b/include/elf/ChangeLog
@@ -1,3 +1,7 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * common.h (STB_GNU_UNIQUE): Define.
+
2009-07-10 Tom Tromey <tromey@redhat.com>
* dwarf2.h: Move to `..'.
diff --git a/include/elf/common.h b/include/elf/common.h
index 75f4eb8..72afa91 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -1,6 +1,6 @@
/* ELF support for BFD.
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
@@ -555,6 +555,7 @@
#define STB_GLOBAL 1 /* Symbol visible outside obj */
#define STB_WEAK 2 /* Like globals, lower precedence */
#define STB_LOOS 10 /* OS-specific semantics */
+#define STB_GNU_UNIQUE 10 /* Symbol is unique in namespace */
#define STB_HIOS 12 /* OS-specific semantics */
#define STB_LOPROC 13 /* Processor-specific semantics */
#define STB_HIPROC 15 /* Processor-specific semantics */
diff --git a/ld/ChangeLog b/ld/ChangeLog
index 87ab48b..10160eb 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,8 @@
+2009-07-23 Ulrich Drepper <drepper@redhat.com>
+
+ * NEWS: Mention the linker's support for symbols with a binding of
+ STB_GNU_UNIQUE.
+
2009-07-22 H.J. Lu <hongjiu.lu@intel.com>
PR ld/10429
diff --git a/ld/NEWS b/ld/NEWS
index 6f05361..821915e 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -1,4 +1,8 @@
-*- text -*-
+* GNU/Linux targets now support the STB_GNU_UNIQUE symbol binding. This is a
+ GNU extension to the standard set of ELF symbol bindings. The binding will
+ be passed on to the dynamic linker which will make sure that in the entire
+ process there is just one symbol with the given name and type in use.
* PE targets now support a GNU extension to allow the alignment of common
common symbols to be specified. This support uses custom options in