be added to the dynamic symbol table if the output format supports it.
See the description of @samp{--dynamic-list}.
+Note that this option is specific to ELF targeted ports. PE targets
+support a similar function to export all symbols from a DLL or EXE; see
+the description of @samp{--export-all-symbols} below.
+
@ifclear SingleFormat
@cindex big-endian objects
@cindex endianness
in which they are specified on the command line. Directories specified
on the command line are searched before the default directories. All
@option{-L} options apply to all @option{-l} options, regardless of the
-order in which the options appear.
+order in which the options appear. @option{-L} options do not affect
+how @command{ld} searches for a linker script unless @option{-T}
+option is specified.
If @var{searchdir} begins with @code{=}, then the @code{=} will be replaced
by the @dfn{sysroot prefix}, a path specified when the linker is configured.
@item --warn-shared-textrel
Warn if the linker adds a DT_TEXTREL to a shared object.
+@kindex --warn-alternate-em
+@item --warn-alternate-em
+Warn if an object has alternate ELF machine code.
+
@kindex --warn-unresolved-symbols
@item --warn-unresolved-symbols
If the linker is going to report an unresolved symbol (see the option
@var{which}.
[This option is specific to the i386 PE targeted port of the linker]
+The following options set flags in the @code{DllCharacteristics} field
+of the PE file header:
+[These options are specific to PE targeted ports of the linker]
+
+@kindex --dynamicbase
+@item --dynamicbase
+The image base address may be relocated using address space layout
+randomization (ASLR). This feature was introduced with MS Windows
+Vista for i386 PE targets.
+
+@kindex --forceinteg
+@item --forceinteg
+Code integrity checks are enforced.
+
+@kindex --nxcompat
+@item --nxcompat
+The image is compatible with the Data Execution Prevention.
+This feature was introduced with MS Windows XP SP2 for i386 PE targets.
+
+@kindex --no-isolation
+@item --no-isolation
+Although the image understands isolation, do not isolate the image.
+
+@kindex --no-seh
+@item --no-seh
+The image does not use SEH. No SE handler may be called from
+this image.
+
+@kindex --no-bind
+@item --no-bind
+Do not bind this image.
+
+@kindex --wdmdriver
+@item --wdmdriver
+The driver uses the MS Windows Driver Model.
+
+@kindex --tsaware
+@item --tsaware
+The image is Terminal Server aware.
+
@end table
@c man end
@smallexample
@group
@var{section} [@var{address}] [(@var{type})] :
- [AT(@var{lma})] [ALIGN(@var{section_align})] [SUBALIGN(@var{subsection_align})]
+ [AT(@var{lma})]
+ [ALIGN(@var{section_align})]
+ [SUBALIGN(@var{subsection_align})]
+ [@var{constraint}]
@{
@var{output-section-command}
@var{output-section-command}
aligned upward to the specified value.
Specifying @var{address} for a section will change the value of the
-location counter.
+location counter, provided that the section is non-empty. (Empty
+sections are ignored).
@node Input Section
@subsection Input Section Description
@cindex output section attributes
We showed above that the full description of an output section looked
like this:
+
@smallexample
@group
@var{section} [@var{address}] [(@var{type})] :
- [AT(@var{lma})] [ALIGN(@var{section_align})] [SUBALIGN(@var{subsection_align})]
+ [AT(@var{lma})]
+ [ALIGN(@var{section_align})]
+ [SUBALIGN(@var{subsection_align})]
+ [@var{constraint}]
@{
@var{output-section-command}
@var{output-section-command}
@} [>@var{region}] [AT>@var{lma_region}] [:@var{phdr} :@var{phdr} @dots{}] [=@var{fillexp}]
@end group
@end smallexample
+
We've already described @var{section}, @var{address}, and
@var{output-section-command}. In this section we will describe the
remaining section attributes.
* Output Section LMA:: Output section LMA
* Forced Output Alignment:: Forced Output Alignment
* Forced Input Alignment:: Forced Input Alignment
+* Output Section Constraint:: Output section constraint
* Output Section Region:: Output section region
* Output Section Phdr:: Output section phdr
* Output Section Fill:: Output section fill
SUBALIGN. The value specified overrides any alignment given by input
sections, whether larger or smaller.
+@node Output Section Constraint
+@subsubsection Output Section Constraint
+@kindex ONLY_IF_RO
+@kindex ONLY_IF_RW
+@cindex constraints on output sections
+You can specify that an output section should only be created if all
+of its input sections are read-only or all of its input sections are
+read-write by using the keyword @code{ONLY_IF_RO} and
+@code{ONLY_IF_RW} respectively.
+
@node Output Section Region
@subsubsection Output Section Region
@kindex >@var{region}
@menu
* Constants:: Constants
+* Symbolic Constants:: Symbolic constants
* Symbols:: Symbol Names
* Orphan Sections:: Orphan Sections
* Location Counter:: The Location Counter
Note - the @code{K} and @code{M} suffixes cannot be used in
conjunction with the base suffixes mentioned above.
+@node Symbolic Constants
+@subsection Symbolic Constants
+@cindex symbolic constants
+@kindex CONSTANT
+It is possible to refer to target specific constants via the use of
+the @code{CONSTANT(@var{name})} operator, where @var{name} is one of:
+
+@table @code
+@item MAXPAGESIZE
+@kindex MAXPAGESIZE
+The target's maximum page size.
+
+@item COMMONPAGESIZE
+@kindex COMMONPAGESIZE
+The target's default page size.
+@end table
+
+So for example:
+
+@smallexample
+ .text ALIGN (CONSTANT (MAXPAGESIZE)) : @{ *(.text) @}
+@end smallexample
+
+will create a text section aligned to the largest page boundary
+supported by the target.
+
@node Symbols
@subsection Symbol Names
@cindex symbol names
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