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.gnu.linkonce section support (useful to link with recent glibc)

tcc-xref
bellard 2003-10-04 14:45:23 +00:00
parent d369a77647
commit 46169b92d9
1 changed files with 28 additions and 3 deletions
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31
tccelf.c
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@ -1508,7 +1508,8 @@ static void *load_data(int fd, unsigned long file_offset, unsigned long size)
typedef struct SectionMergeInfo {
Section *s; /* corresponding existing section */
unsigned long offset; /* offset of the new section in the existing section */
int new_section; /* true if section 's' was added */
uint8_t new_section; /* true if section 's' was added */
uint8_t link_once; /* true if link once section */
} SectionMergeInfo;
/* load an object file and merge it with current files */
@ -1595,8 +1596,19 @@ static int tcc_load_object_file(TCCState *s1,
/* find corresponding section, if any */
for(j = 1; j < s1->nb_sections;j++) {
s = s1->sections[j];
if (!strcmp(s->name, sh_name))
goto found;
if (!strcmp(s->name, sh_name)) {
if (!strncmp(sh_name, ".gnu.linkonce",
sizeof(".gnu.linkonce") - 1)) {
/* if a 'linkonce' section is already present, we
do not add it again. It is a little tricky as
symbols can still be defined in
it. */
sm_table[i].link_once = 1;
goto next;
} else {
goto found;
}
}
}
/* not found: create new section */
s = new_section(s1, sh_name, sh->sh_type, sh->sh_flags);
@ -1630,6 +1642,7 @@ static int tcc_load_object_file(TCCState *s1,
} else {
s->data_offset += size;
}
next: ;
}
/* second short pass to update sh_link and sh_info fields of new
@ -1657,6 +1670,18 @@ static int tcc_load_object_file(TCCState *s1,
if (sym->st_shndx != SHN_UNDEF &&
sym->st_shndx < SHN_LORESERVE) {
sm = &sm_table[sym->st_shndx];
if (sm->link_once) {
/* if a symbol is in a link once section, we use the
already defined symbol. It is very important to get
correct relocations */
if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
name = strtab + sym->st_name;
sym_index = find_elf_sym(symtab_section, name);
if (sym_index)
old_to_new_syms[i] = sym_index;
}
continue;
}
/* if no corresponding section added, no need to add symbol */
if (!sm->s)
continue;