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Alan Modra 7dba9362c1 Rewrite __start and __stop symbol handling 
This arranges for __start and __stop symbols to be defined before
garbage collection, for all target formats.  That should allow the
COFF and PE --gc-sections to keep a singleton orphan input section,
a feature lost by 2017-06-13 commit cbd0eecf26.  The fancier ELF
treatment of keeping all input sections associated with a __start or
__stop symbol, from 2015-10-23 commit 1cce69b9dc, is retained.

.startof. and .sizeof. symbols are deliberately not defined before
garbage collection, so these won't affect garbage collection of
sections.

The patch also ensures __start, __stop, .startof. and .sizeof. symbols
are defined before target size_dynamic_sections is called, albeit
with a preliminary value, so that target code doesn't need to cope
with a symbol changing from undefined at size_dynamic_sections to
defined at relocate_section.

Also, a number of problems with the testcases have been fixed.

	PR ld/20022
	PR ld/21557
	PR ld/21562
	PR ld/21571
include/
	* bfdlink.h (struct bfd_link_hash_entry): Delete undef.section.
bfd/
	* targets.c (struct bfd_target): Add _bfd_define_start_stop.
	(BFD_JUMP_TABLE_LINK): Likewise.
	* elf-bfd.h (bfd_elf_define_start_stop): Declare.
	* elflink.c (_bfd_elf_gc_mark_rsec): Update comment.
	(bfd_elf_define_start_stop): New function.
	* linker.c (bfd_generic_define_start_stop): New function.
	* coff64-rs6000.c (rs6000_xcoff64_vec, rs6000_xcoff64_aix_vec): Init
	new field.
	* aout-adobe.c (aout_32_bfd_define_start_stop): Define.
	* aout-target.h (MY_bfd_define_start_stop): Define.
	* aout-tic30.c (MY_bfd_define_start_stop): Define.
	* binary.c (binary_bfd_define_start_stop): Define.
	* bout.c (b_out_bfd_define_start_stop): Define.
	* coff-alpha.c (_bfd_ecoff_bfd_define_start_stop): Define.
	* coff-mips.c (_bfd_ecoff_bfd_define_start_stop): Define.
	* coff-rs6000.c (_bfd_xcoff_bfd_define_start_stop): Define.
	* coffcode.h (coff_bfd_define_start_stop): Define.
	* elfxx-target.h (bfd_elfNN_bfd_define_start_stop): Define.
	* i386msdos.c (msdos_bfd_define_start_stop): Define.
	* i386os9k.c (os9k_bfd_define_start_stop): Define.
	* ieee.c (ieee_bfd_define_start_stop): Define.
	* ihex.c (ihex_bfd_define_start_stop): Define.
	* libbfd-in.h (_bfd_nolink_bfd_define_start_stop): Define.
	* mach-o-target.c (bfd_mach_o_bfd_define_start_stop): Define.
	* mmo.c (mmo_bfd_define_start_stop): Define.
	* nlm-target.h (nlm_bfd_define_start_stop): Define.
	* oasys.c (oasys_bfd_define_start_stop): Define.
	* pef.c (bfd_pef_bfd_define_start_stop): Define.
	* plugin.c (bfd_plugin_bfd_define_start_stop): Define.
	* ppcboot.c (ppcboot_bfd_define_start_stop): Define.
	* som.c (som_bfd_define_start_stop): Define.
	* srec.c (srec_bfd_define_start_stop): Define.
	* tekhex.c (tekhex_bfd_define_start_stop): Define.
	* versados.c (versados_bfd_define_start_stop): Define.
	* vms-alpha.c (vms_bfd_define_start_stop): Define.
	(alpha_vms_bfd_define_start_stop): Define.
	* xsym.c (bfd_sym_bfd_define_start_stop): Define.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
ld/
	* emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Don't set
	__start/__stop syms here.
	* ldlang.c (lang_set_startof): Delete.
	(start_stop_syms, start_stop_count, start_stop_alloc): New vars.
	(lang_define_start_stop, lang_init_start_stop, foreach_start_stop,
	undef_start_stop, lang_undef_start_stop, lang_init_startof_sizeof,
	set_start_stop, lang_finalize_start_stop): New functions.
	(lang_process): Call _start_stop functions.
	* testsuite/ld-elf/pr21562a.d: Use xfail rather than notarget.
	Correct typos and list of xfail targets.
	* testsuite/ld-elf/pr21562b.d: Likewise.
	* testsuite/ld-elf/pr21562c.d: Likewise.
	* testsuite/ld-elf/pr21562d.d: Likewise.
	* testsuite/ld-elf/pr21562e.d: Likewise.
	* testsuite/ld-elf/pr21562f.d: Likewise.
	* testsuite/ld-elf/pr21562g.d: Likewise.
	* testsuite/ld-elf/pr21562h.d: Likewise.
	* testsuite/ld-elf/pr21562i.d: Likewise.
	* testsuite/ld-elf/pr21562j.d: Likewise.
	* testsuite/ld-elf/pr21562k.d: Likewise.
	* testsuite/ld-elf/pr21562l.d: Likewise.
	* testsuite/ld-elf/pr21562m.d: Likewise.
	* testsuite/ld-elf/pr21562n.d: Likewise.
	* testsuite/ld-elf/sizeofa.d: Likewise.  Adjust to pass for generic ELF.
	* testsuite/ld-elf/sizeofb.d: Likewise.
	* testsuite/ld-elf/startofa.d: Likewise.
	* testsuite/ld-elf/startofb.d: Likewise.
2017-06-16 23:38:28 +09:30
..
aout Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
cgen Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
coff Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
elf PPC64_OPT_LOCALENTRY 2017-06-01 22:47:32 +09:30
gdb update copyright year range in GDB files 2017-01-01 10:52:34 +04:00
mach-o Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
nlm Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
opcode S/390: Improve error checking for optional operands 2017-05-30 10:22:25 +02:00
som Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
vms Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
alloca-conf.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
ansidecl.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
bfdlink.h Rewrite __start and __stop symbol handling 2017-06-16 23:38:28 +09:30
binary-io.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
bout.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
ChangeLog Rewrite __start and __stop symbol handling 2017-06-16 23:38:28 +09:30
ChangeLog-0415
ChangeLog-2016 ChangeLog rotation 2017-01-02 13:55:05 +10:30
ChangeLog-9103
COPYING
COPYING3
demangle.h Sync libiberty sources with GCC. 2017-03-13 17:49:32 +00:00
dis-asm.h Don't use print_insn_XXX in GDB 2017-06-14 16:29:01 +01:00
dwarf2.def Add DW_OP_GNU_variable_value 2017-03-14 12:57:48 -07:00
dwarf2.h Sync dwarf headers with master versions in gcc repository. 2017-01-03 15:18:52 +00:00
dyn-string.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
environ.h Fix MinGW compilation warnings due to environ.h 2017-05-31 09:35:07 +03:00
fibheap.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
filenames.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
floatformat.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
fnmatch.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
fopen-bin.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
fopen-same.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
fopen-vms.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
gcc-c-fe.def Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
gcc-c-interface.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
gcc-interface.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
getopt.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
hashtab.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
hp-symtab.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
ieee.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
leb128.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
libiberty.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
longlong.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
lto-symtab.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
MAINTAINERS Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
md5.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
oasys.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
objalloc.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
obstack.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
os9k.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
partition.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
plugin-api.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
progress.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
safe-ctype.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
sha1.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
simple-object.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
sort.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
splay-tree.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
symcat.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
timeval-utils.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
vtv-change-permission.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
xregex2.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
xregex.h
xtensa-config.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
xtensa-isa-internal.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
xtensa-isa.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30