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option to use an old algorithm of the array in struct initialization

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This is for a case when no '{' is used in the initialization code.
    An option name is -fold-struct-init-code. A linux 2.4.26 can't
    find initrd when compiled with a new algorithm.
This commit is contained in:
seyko 2015-04-10 23:44:10 +03:00
parent 92efee6e52
commit 5c9dde7255
3 changed files with 34 additions and 4 deletions
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1
libtcc.c
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@ -1478,6 +1478,7 @@ static const FlagDef flag_defs[] = {
{ offsetof(TCCState, nocommon), FD_INVERT, "common" },
{ offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
{ offsetof(TCCState, ms_extensions), 0, "ms-extensions" },
{ offsetof(TCCState, old_struct_init_code), 0, "old-struct-init-code" },
};
/* set/reset a flag */

2
tcc.h
View File

@ -603,6 +603,8 @@ struct TCCState {
int char_is_unsigned;
int leading_underscore;
int ms_extensions; /* allow nested named struct w/o identifier behave like unnamed */
int old_struct_init_code; /* use old algorithm to init array in struct when there is no '{' used.
Liuux 2.4.26 can't find initrd when compiled with a new algorithm */
/* warning switches */
int warn_write_strings;

35
tccgen.c
View File

@ -5575,22 +5575,45 @@ static void decl_initializer(CType *type, Section *sec, unsigned long c,
struct/union init */
/* XXX: union needs only one init */
int par_count = 0;
if (tok == '(') {
AttributeDef ad1;
CType type1;
next();
if (tok != '(') {
if (tcc_state->old_struct_init_code) {
/* an old version of struct initialization.
It have a problems. But with a new version
linux 2.4.26 can't load ramdisk.
*/
while (tok == '(') {
par_count++;
next();
}
if (!parse_btype(&type1, &ad1))
expect("cast");
type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
#if 0
if (!is_assignable_types(type, &type1))
tcc_error("invalid type for cast");
#endif
skip(')');
}
else
{
if (tok != '(') {
if (!parse_btype(&type1, &ad1))
expect("cast");
type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
#if 0
#if 0
if (!is_assignable_types(type, &type1))
tcc_error("invalid type for cast");
#endif
#endif
skip(')');
} else
} else
unget_tok(tok);
}
}
no_oblock = 1;
if (first || tok == '{') {
skip('{');
@ -5663,6 +5686,10 @@ static void decl_initializer(CType *type, Section *sec, unsigned long c,
}
if (!no_oblock)
skip('}');
while (par_count) {
skip(')');
par_count--;
}
} else if (tok == '{') {
next();
decl_initializer(type, sec, c, first, size_only);