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An assignment to dot in an output section that allocates space of
course keeps the output section. Here, I'm changing the behaviour for
assignments that don't allocate space. The idea is not so much to
allow people to force output of an empty section with ". = .", but
to fix cases where an otherwise empty section has padding added by an
alignment expression that changes with relaxation or .eh_frame
editing. Such a section might have zero size before relaxation and so
be stripped incorrectly.
ld/
* ld.texinfo (Output Section Discarding): Mention assigning to dot
as a way of keeping otherwise empty sections.
* ldexp.c (is_dot, is_value, is_sym_value, is_dot_ne_0,
is_dot_plus_0, is_align_conditional): New predicates.
(exp_fold_tree_1): Set SEC_KEEP when assigning to dot inside an
output section, except for some special cases.
* scripttempl/elfmicroblaze.sc: Use canonical form to align at
end of .heap and .stack.
ld/testsuite/
* ld-shared/elf-offset.ld: Align end of .bss with canonical form
of ALIGN that allows an empty .bss to be removed.
* ld-arm/arm-dyn.ld: Likewise.
* ld-arm/arm-lib.ld: Likewise.
* ld-elfvsb/elf-offset.ld: Likewise.
* ld-mips-elf/mips-dyn.ld: Likewise.
* ld-mips-elf/mips-lib.ld: Likewise.
* ld-arm/arm-no-rel-plt.ld: Remove duplicate ALIGN.
* ld-powerpc/vle-multiseg-1.ld: Remove ALIGN at start of section.
ALIGN address of section instead.
* ld-powerpc/vle-multiseg-2.ld: Likewise.
* ld-powerpc/vle-multiseg-3.ld: Likewise.
* ld-powerpc/vle-multiseg-4.ld: Likewise.
* ld-powerpc/vle-multiseg-6.ld: Likewise.
* ld-scripts/empty-aligned.d: Check section headers not program
headers. Remove xfail and notarget.
* ld-scripts/empty-aligned.t: Use canonical ALIGN for end of .text2.
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* ld-elf/merge2.d: xfail arc-*-* and dlx-*-*.
* ld-scripts/empty-aligned.s: No .data section.
* ld-scripts/empty-aligned.t: Discard most sections.
* ld-scripts/empty-aligned.d: Adjust.
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that no .text? section is kept. Also check setting vma and
lma.
* ld-scripts/empty-aligned.d: Update.
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2005-05-17 H.J. Lu <hongjiu.lu@intel.com>
PR 797
* elf32-i386.c (elf_i386_size_dynamic_sections): Also remove
empty sdynbss section.
* elf64-x86-64.c (elf64_x86_64_size_dynamic_sections): Likewise.
ld/
2005-05-17 H.J. Lu <hongjiu.lu@intel.com>
PR 797
* ldexp.c (exp_fold_tree_1): Renamed from exp_fold_tree and
take take a bfd_boolean, mark_used. Ignore assert failure if
mark_used is TRUE.
(exp_fold_tree) Call exp_fold_tree_1 with mark_used == FALSE.
(exp_fold_tree_no_dot): Updated to take a bfd_boolean,
mark_used and pass down.
(fold_unary): Likewise.
(fold_binary): Likewise.
(fold_trinary): Likewise.
(exp_binop): Add FALSE to call to exp_fold_tree_no_dot.
(exp_trinop): Likewise.
(exp_unop): Likewise.
(exp_nameop): Likewise.
(exp_get_vma): Likewise.
(exp_get_fill): Likewise.
(exp_get_abs_int): Likewise.
(fold_name): Likewise. Set SEC_KEEP in output section flags.
(exp_mark_used_section): New.
* ldexp.h (exp_mark_used_section): New.
* ldlang.c (lang_output_section_statement_lookup_1): Set the
ignored field to FALSE.
(lang_mark_used_section_1): New.
(lang_mark_used_section): Call lang_mark_used_section_1.
(strip_excluded_output_sections): Call lang_mark_used_section
and check for unused sections.
(lang_size_sections_1): Skip an output section if it should
be ignored.
(lang_do_assignments_1): Likewise.
(lang_process): Don't call lang_mark_used_section here.
* ldlang.h (lang_output_section_statement_type): Change
all_input_readonly to bitfield. Add ignored.
ld/testsuite/
2005-05-17 H.J. Lu <hongjiu.lu@intel.com>
PR 797
* empty-aligned.d: New file.
* empty-aligned.exp: Likewise.
* empty-aligned.s: Likewise.
* empty-aligned.t: Likewise.
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