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re PR lto/83452 (FAIL: gfortran.dg/save_6.f90 -O0 (test for excess errors)) 

2017-01-02  Richard Biener  <rguenther@suse.de>

	PR lto/83452
	* simple-object-elf.c (simple_object_elf_copy_lto_debug_section):
	Do not use UNDEF locals for removed symbols but instead just
	define them in the first prevailing section and with no name.
	Use the same gnu_lto_v1 name for all removed globals we promote to
	WEAK UNDEFs so hpux can use a stub to provide this symbol.  Clear
	sh_info and sh_link in removed sections.

From-SVN: r256069
This commit is contained in:
Richard Biener 2018-01-02 08:45:05 +00:00 committed by Richard Biener
parent d42e3a016b
commit c1177db4fa
2 changed files with 44 additions and 23 deletions
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10
libiberty/ChangeLog
View File

@ -1,3 +1,13 @@
2017-01-02 Richard Biener <rguenther@suse.de>
PR lto/83452
* simple-object-elf.c (simple_object_elf_copy_lto_debug_section):
Do not use UNDEF locals for removed symbols but instead just
define them in the first prevailing section and with no name.
Use the same gnu_lto_v1 name for all removed globals we promote to
WEAK UNDEFs so hpux can use a stub to provide this symbol. Clear
sh_info and sh_link in removed sections.
2017-10-30 Richard Biener <rguenther@suse.de>
PR lto/82757

57
libiberty/simple-object-elf.c
View File

@ -1091,6 +1091,7 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
int changed;
int *pfnret;
const char **pfnname;
unsigned first_shndx = 0;
shdr_size = (ei_class == ELFCLASS32
? sizeof (Elf32_External_Shdr)
@ -1158,6 +1159,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
ret = (*pfn) (&name);
pfnret[i - 1] = ret == 1 ? 0 : -1;
pfnname[i - 1] = name;
if (first_shndx == 0
&& pfnret[i - 1] == 0)
first_shndx = i;
}
/* Mark sections as preserved that are required by to be preserved
@ -1327,6 +1331,15 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
sobj->offset + stroff,
(unsigned char *)strings,
strsz, &errmsg, err);
/* Find gnu_lto_ in strings. */
char *gnu_lto = strings;
while ((gnu_lto = memchr (gnu_lto, 'g',
strings + strsz - gnu_lto)))
if (strncmp (gnu_lto, "gnu_lto_v1",
strings + strsz - gnu_lto) == 0)
break;
else
gnu_lto++;
for (ent = buf; ent < buf + length; ent += entsize)
{
unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class,
@ -1366,31 +1379,27 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
in case it is local. */
int bind = ELF_ST_BIND (*st_info);
int other = STV_DEFAULT;
size_t st_name;
if (bind == STB_LOCAL)
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_name, Elf_Word, 0);
{
/* Make discarded local symbols unnamed and
defined in the first prevailing section. */
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_name, Elf_Word, 0);
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_shndx, Elf_Half, first_shndx);
}
else
{
/* Make discarded global symbols hidden weak
undefined and sharing the gnu_lto_ name. */
bind = STB_WEAK;
st_name = ELF_FETCH_FIELD (type_functions, ei_class,
Sym, ent, st_name,
Elf_Word);
if (st_name < strsz)
{
char *p = strings + st_name;
if (p[0] == '_'
&& p[1] == '_'
&& strncmp (p + (p[2] == '_'),
"__gnu_lto_", 10) == 0)
{
other = STV_HIDDEN;
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_name, Elf_Word,
st_name + 2);
}
}
other = STV_HIDDEN;
if (gnu_lto)
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_name, Elf_Word,
gnu_lto - strings);
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_shndx, Elf_Half, SHN_UNDEF);
}
*st_other = other;
*st_info = ELF_ST_INFO (bind, STT_NOTYPE);
@ -1398,8 +1407,6 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
ent, st_value, Elf_Addr, 0);
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_size, Elf_Word, 0);
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_shndx, Elf_Half, SHN_UNDEF);
}
}
XDELETEVEC (strings);
@ -1422,6 +1429,10 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
link. */
ELF_SET_FIELD (type_functions, ei_class, Shdr,
shdr, sh_type, Elf_Word, SHT_NULL);
ELF_SET_FIELD (type_functions, ei_class, Shdr,
shdr, sh_info, Elf_Word, 0);
ELF_SET_FIELD (type_functions, ei_class, Shdr,
shdr, sh_link, Elf_Word, 0);
}
flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,