binutils-gdb/ld/testsuite/ld-scripts/empty-aligned.d

#source: empty-aligned.s
#ld: -T empty-aligned.t
#readelf: -S --wide

#...
.* .text .*
!.* .text[234] .*
#pass
bfd/ 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. 2005-05-18 00:43:02 +08:00			`#source: empty-aligned.s`
* ld-scripts/empty-aligned.d: Revert last change. Allow more than one header, just not two PT_LOAD. * ld-elf/stack.s: Use .long 0 rather than nops. 2012-10-25 07:22:48 +08:00			`#ld: -T empty-aligned.t`
Make assignments to dot keep an empty output section. 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. 2014-01-22 09:13:03 +08:00			`#readelf: -S --wide`
bfd/ 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. 2005-05-18 00:43:02 +08:00
			`#...`
Make assignments to dot keep an empty output section. 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. 2014-01-22 09:13:03 +08:00			`.* .text .*`
			`!.* .text[234] .*`
			`#pass`