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* NEWS: Mention LMA default change.

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* ld.texinfo (Output Section LMA): Update default description.
	(Location Counter): Clarify backward movement.
	* ldlang.c (lang_size_sections_1): Leave non-alloc sections with
	default lma equal to vma.  Warn on backward movement of dot.
This commit is contained in:
Alan Modra
2006-08-22 07:41:05 +00:00
parent 0e2a4ebaf0
commit dc0b6aa05a
4 changed files with 53 additions and 11 deletions
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33
ld/ldlang.c
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@@ -4400,16 +4400,30 @@ lang_size_sections_1
lma = align_power (lma, os->section_alignment);
os->bfd_section->lma = lma;
}
else if (r->last_os != NULL)
else if (r->last_os != NULL
&& (os->bfd_section->flags & SEC_ALLOC) != 0)
{
bfd_vma lma;
asection *last;
last = r->last_os->output_section_statement.bfd_section;
/* If dot moved backwards (which is invalid according
to ld docs) then leave lma equal to vma. This
keeps users of buggy ld scripts happy. */
if (dot >= last->vma)
/* A backwards move of dot should be accompanied by
an explicit assignment to the section LMA (ie.
os->load_base set) because backwards moves normally
create overlapping LMAs. */
if (dot < last->vma)
{
einfo (_("%P: warning: dot moved backwards before `%s'\n"),
os->name);
/* If dot moved backwards then leave lma equal to
vma. This is the old default lma, which might
just happen to work when the backwards move is
sufficiently large. Nag anyway, so people fix
their linker scripts. */
}
else
{
/* If the current vma overlaps the previous section,
then set the current lma to that at the end of
@@ -4440,9 +4454,16 @@ lang_size_sections_1
lma region. We use this to set the lma for
following sections. Overlays or other linker
script assignment to lma might mean that the
default lma == vma is incorrect. */
default lma == vma is incorrect.
To avoid warnings about dot moving backwards when using
-Ttext, don't start tracking sections until we find one
of non-zero size or with lma set differently to vma. */
if (((os->bfd_section->flags & SEC_HAS_CONTENTS) != 0
|| (os->bfd_section->flags & SEC_THREAD_LOCAL) == 0)
&& (os->bfd_section->flags & SEC_ALLOC) != 0
&& (os->bfd_section->size != 0
|| os->bfd_section->vma != os->bfd_section->lma
|| r->last_os != NULL)
&& os->lma_region == NULL
&& !link_info.relocatable)
r->last_os = s;