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* ld.h (DISCARD_SECTION_NAME): Define to "/DISCARD/". 

* ldlang.c (init_os): Fail on an attempt to initialize any section
	named DISCARD_SECTION_NAME.
	(wild_doit): Discard input sections assigned to an output section
	named DISCARD_SECTION_NAME.
	* ld.texinfo: Document use of /DISCARD/.
This commit is contained in:
Ian Lance Taylor 1996-03-27 18:17:28 +00:00
parent 64664e69cb
commit cf2e4f5fde
3 changed files with 34 additions and 9 deletions
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7
ld/ChangeLog
View File

@ -1,5 +1,12 @@
Wed Mar 27 12:33:24 1996 Ian Lance Taylor <ian@cygnus.com>
* ld.h (DISCARD_SECTION_NAME): Define to "/DISCARD/".
* ldlang.c (init_os): Fail on an attempt to initialize any section
named DISCARD_SECTION_NAME.
(wild_doit): Discard input sections assigned to an output section
named DISCARD_SECTION_NAME.
* ld.texinfo: Document use of /DISCARD/.
* ldlang.c: Fix some indentation and comments.
Tue Mar 26 18:14:49 1996 Ian Lance Taylor <ian@cygnus.com>

10
ld/ld.texinfo
View File

@ -781,7 +781,6 @@ exist, @code{ld} looks for it in the directories specified by any
preceding @samp{-L} options. Multiple @samp{-T} options accumulate.
@kindex -t
@cindex verbose
@cindex input files, displaying
@item -t
Print the names of the input files as @code{ld} processes them.
@ -824,10 +823,11 @@ be added to. Use @samp{-Ur} only for the last partial link, and
@samp{-r} for the others.
@kindex --verbose
@cindex version
@cindex verbose
@item --verbose
Display the version number for @code{ld} and list the linker emulations
supported. Display which input files can and cannot be opened.
supported. Display which input files can and cannot be opened. Display
the linker script if using a default builtin script.
@kindex -v
@kindex -V
@ -1759,6 +1759,10 @@ sequence of characters, but any name which does not conform to the standard
@code{ld} symbol name syntax must be quoted.
@xref{Symbols, , Symbol Names}.
The special @var{secname} @samp{/DISCARD/} may be used to discard input
sections. Any sections which are assigned to an output section named
@samp{/DISCARD/} are not included in the final link output.
The linker will not create output sections which do not have any
contents. This is for convenience when referring to input sections that
may or may not exist. For example,

26
ld/ldlang.c
View File

@ -603,10 +603,13 @@ static void
init_os (s)
lang_output_section_statement_type * s;
{
/* asection *section = bfd_get_section_by_name(output_bfd, s->name);*/
section_userdata_type *new =
(section_userdata_type *)
stat_alloc (sizeof (section_userdata_type));
section_userdata_type *new;
if (strcmp (s->name, DISCARD_SECTION_NAME) == 0)
einfo ("%P%F: Illegal use of `%s' section", DISCARD_SECTION_NAME);
new = ((section_userdata_type *)
stat_alloc (sizeof (section_userdata_type)));
s->bfd_section = bfd_get_section_by_name (output_bfd, s->name);
if (s->bfd_section == (asection *) NULL)
@ -622,7 +625,6 @@ init_os (s)
/* vma to allow us to output a section through itself */
s->bfd_section->output_offset = 0;
get_userdata (s->bfd_section) = (PTR) new;
}
/* The wild routines.
@ -642,6 +644,18 @@ wild_doit (ptr, section, output, file)
lang_output_section_statement_type *output;
lang_input_statement_type *file;
{
/* Input sections which are assigned to a section named
DISCARD_SECTION_NAME are discarded. */
if (strcmp (output->name, DISCARD_SECTION_NAME) == 0)
{
if (section != NULL && section->output_section == NULL)
{
/* This prevents future calls from assigning this section. */
section->output_section = bfd_abs_section_ptr;
}
return;
}
if (output->bfd_section == NULL)
init_os (output);
@ -673,7 +687,7 @@ wild_doit (ptr, section, output, file)
if (section->alignment_power > output->bfd_section->alignment_power)
output->bfd_section->alignment_power = section->alignment_power;
/* If supplied an aligment, then force it */
/* If supplied an aligment, then force it. */
if (output->section_alignment != -1)
output->bfd_section->alignment_power = output->section_alignment;
}