\input texinfo
@setfilename ld.info
@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-@c 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+@c 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
@c Free Software Foundation, Inc.
@syncodeindex ky cp
@c man begin INCLUDE
@set UsesEnvVars
@set GENERIC
@set ARM
+@set C6X
@set H8300
@set HPPA
@set I960
unresolved symbol but the option @option{--warn-unresolved-symbols}
can change this to a warning.
-@kindex --verbose
-@cindex verbose
+@kindex --verbose[=@var{NUMBER}]
+@cindex verbose[=@var{NUMBER}]
@item --dll-verbose
-@itemx --verbose
+@itemx --verbose[=@var{NUMBER}]
Display the version number for @command{ld} and list the linker emulations
supported. Display which input files can and cannot be opened. Display
-the linker script being used by the linker.
+the linker script being used by the linker. If the optional @var{NUMBER}
+argument > 1, plugin symbol status will also be displayed.
@kindex --version-script=@var{version-scriptfile}
@cindex version script, symbol versions
Request creation of @code{.eh_frame_hdr} section and ELF
@code{PT_GNU_EH_FRAME} segment header.
+@kindex --ld-generated-unwind-info
+@item --no-ld-generated-unwind-info
+Request creation of @code{.eh_frame} unwind info for linker
+generated code sections like PLT. This option is on by default
+if linker generated unwind info is supported.
+
@kindex --enable-new-dtags
@kindex --disable-new-dtags
@item --enable-new-dtags
@c man end
+@ifset C6X
+@subsection Options specific to C6X uClinux targets
+
+@c man begin OPTIONS
+
+The C6X uClinux target uses a binary format called DSBT to support shared
+libraries. Each shared library in the system needs to have a unique index;
+all executables use an index of 0.
+
+@table @gcctabopt
+
+@kindex --dsbt-size
+@item --dsbt-size @var{size}
+This option sets the number of entires in the DSBT of the current executable
+or shared library to @var{size}. The default is to create a table with 64
+entries.
+
+@kindex --dsbt-index
+@item --dsbt-index @var{index}
+This option sets the DSBT index of the current executable or shared library
+to @var{index}. The default is 0, which is appropriate for generating
+executables. If a shared library is generated with a DSBT index of 0, the
+@code{R_C6000_DSBT_INDEX} relocs are copied into the output file.
+
+@kindex --no-merge-exidx-entries
+The @samp{--no-merge-exidx-entries} switch disables the merging of adjacent
+exidx entries in frame unwind info.
+
+@end table
+
+@c man end
+@end ifset
+
@ifset M68HC11
@subsection Options specific to Motorola 68HC11 and 68HC12 targets
architecture of an object file by using the @code{objdump} program with
the @samp{-f} option.
@end ifclear
+
+@item LD_FEATURE(@var{string})
+@kindex LD_FEATURE(@var{string})
+This command may be used to modify @command{ld} behavior. If
+@var{string} is @code{"SANE_EXPR"} then absolute symbols and numbers
+in a script are simply treated as numbers everywhere.
+@xref{Expression Section}.
@end table
@node Assignments
difference is @code{SORT_BY_ALIGNMENT} will sort sections into
ascending order by alignment before placing them in the output file.
+@cindex SORT_BY_INIT_PRIORITY
+@code{SORT_BY_INIT_PRIORITY} is very similar to @code{SORT_BY_NAME}. The
+difference is @code{SORT_BY_INIT_PRIORITY} will sort sections into
+ascending order by numerical value of the GCC init_priority attribute
+encoded in the section name before placing them in the output file.
+
@cindex SORT
@code{SORT} is an alias for @code{SORT_BY_NAME}.
address, such as @code{ADDR}, @code{LOADADDR}, @code{ORIGIN} and
@code{SEGMENT_START}. Other terms are simply numbers, or are builtin
functions that return a non-address value, such as @code{LENGTH}.
-
-When the linker evaluates an expression, the result depends on where
-the expression is located in a linker script. Expressions appearing
-outside an output section definitions are evaluated with all terms
-first being converted to absolute addresses before applying operators,
-and evaluate to an absolute address result. Expressions appearing
-inside an output section definition are evaluated with more complex
-rules, but the aim is to treat terms as relative addresses and produce
-a relative address result. In particular, an assignment of a number
-to a symbol results in a symbol relative to the output section with an
-offset given by the number. So, in the following simple example,
+One complication is that unless you set @code{LD_FEATURE ("SANE_EXPR")}
+(@pxref{Miscellaneous Commands}), numbers and absolute symbols are treated
+differently depending on their location, for compatibility with older
+versions of @code{ld}. Expressions appearing outside an output
+section definition treat all numbers as absolute addresses.
+Expressions appearing inside an output section definition treat
+absolute symbols as numbers. If @code{LD_FEATURE ("SANE_EXPR")} is
+given, then absolute symbols and numbers are simply treated as numbers
+everywhere.
+
+In the following simple example,
@smallexample
@group
@code{__data_start} are set to 0x10 relative to the @code{.data}
section in the second two assignments.
-For expressions appearing inside an output section definition
-involving numbers, relative addresses and absolute addresses, ld
-follows these rules to evaluate terms:
+For expressions involving numbers, relative addresses and absolute
+addresses, ld follows these rules to evaluate terms:
@itemize @bullet
@item
@item
The result of comparisons, @samp{&&} and @samp{||} is also a number.
@item
-The result of other operations on relative addresses (after above
-conversions) is a relative address in the same section as the operand(s).
+The result of other binary arithmetic and logical operations on two
+relative addresses in the same section or two absolute addresess
+(after above conversions) is also a number.
+@item
+The result of other operations on relative addresses or one
+relative address and a number, is a relative address in the same
+section as the relative operand(s).
@item
The result of other operations on absolute addresses (after above
conversions) is an absolute address.
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