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Revert "String literals are always const"

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This reverts commit d4fe9aba3f.
I was confused by the fact that string literals aren't writable.
Nevertheless the type isn't const.  As extension in GCC it's const
with -Wwrite-string, which is exactly what we had before.

GCC also wonders in a comment if it's really a good idea to change
expression types based on warning flags (IMHO it's not), but let's
be compatible.  So restore the state from before.
This commit is contained in:
Michael Matz 2017-07-04 16:37:49 +02:00
parent 580ad5f24c
commit 9ed8b54f6c
1 changed files with 3 additions and 3 deletions
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4
tccgen.c
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@ -2829,8 +2829,7 @@ static void gen_assign_cast(CType *dt)
}
}
/* check const and volatile */
if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT) &&
((type2->t & VT_BTYPE) != VT_BYTE || tcc_state->warn_write_strings)) ||
if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
(!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
tcc_warning("assignment discards qualifiers from pointer target type");
break;
@ -4382,6 +4381,7 @@ ST_FUNC void unary(void)
/* string parsing */
t = VT_BYTE;
str_init:
if (tcc_state->warn_write_strings)
t |= VT_CONSTANT;
type.t = t;
mk_pointer(&type);