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c-common.c (shorten_compare): Don't -Wtype-limits if the non-constant operand comes from a macro.

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* c-common.c (shorten_compare): Don't -Wtype-limits if the
	non-constant operand comes from a macro.

From-SVN: r230589
This commit is contained in:
Jason Merrill 2015-11-18 23:26:48 -05:00 • committed by Jason Merrill
parent 7d7e7aca3b
commit d0eccfcdc3
3 changed files with 19 additions and 1 deletions
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5
gcc/c-family/ChangeLog
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@ -1,3 +1,8 @@
2015-11-18 Jason Merrill <jason@redhat.com>
* c-common.c (shorten_compare): Don't -Wtype-limits if the
non-constant operand comes from a macro.
2015-11-17 Jason Merrill <jason@redhat.com>
PR bootstrap/68346

4
gcc/c-family/c-common.c
View file

@ -4650,7 +4650,9 @@ shorten_compare (location_t loc, tree *op0_ptr, tree *op1_ptr,
type = c_common_unsigned_type (type);
}
if (TREE_CODE (primop0) != INTEGER_CST)
if (TREE_CODE (primop0) != INTEGER_CST
/* Don't warn if it's from a macro. */
&& !from_macro_expansion_at (EXPR_LOCATION (primop0)))
{
if (val == truthvalue_false_node)
warning_at (loc, OPT_Wtype_limits,

11
gcc/testsuite/g++.dg/warn/Wtype-limits2.C Normal file
View file

@ -0,0 +1,11 @@
// { dg-options -Wtype-limits }
unsigned char array[4];
bool b;
#define VAL (b ? array[0] : (unsigned char)0)
int main()
{
if (VAL > 1000)
__builtin_abort();
}