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re PR c/77292 (Spurious warning: logical not is only applied to the left hand side of comparison) 

PR c/77292
	* c-common.c (warn_logical_not_parentheses): Don't warn for
	a comparison or a logical operator.

	* c-c++-common/Wlogical-not-parentheses-1.c: New test.

From-SVN: r239833
This commit is contained in:
Marek Polacek 2016-08-29 18:13:13 +00:00 committed by Marek Polacek
parent 6ac852d153
commit 3d06b6f2fd
4 changed files with 41 additions and 2 deletions
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6
gcc/c-family/ChangeLog
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@ -1,3 +1,9 @@
2016-08-29 Marek Polacek <polacek@redhat.com>
PR c/77292
* c-common.c (warn_logical_not_parentheses): Don't warn for
a comparison or a logical operator.
2016-08-29 Tom de Vries <tom@codesourcery.com>
* c-common.c (build_va_arg): Fix type comparison assert.

6
gcc/c-family/c-common.c
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@ -1481,7 +1481,8 @@ warn_tautological_cmp (location_t loc, enum tree_code code, tree lhs, tree rhs)
/* Warn about logical not used on the left hand side operand of a comparison.
This function assumes that the LHS is inside of TRUTH_NOT_EXPR.
Do not warn if RHS is of a boolean type. */
Do not warn if RHS is of a boolean type, a logical operator, or
a comparison. */
void
warn_logical_not_parentheses (location_t location, enum tree_code code,
@ -1489,7 +1490,8 @@ warn_logical_not_parentheses (location_t location, enum tree_code code,
{
if (TREE_CODE_CLASS (code) != tcc_comparison
|| TREE_TYPE (rhs) == NULL_TREE
|| TREE_CODE (TREE_TYPE (rhs)) == BOOLEAN_TYPE)
|| TREE_CODE (TREE_TYPE (rhs)) == BOOLEAN_TYPE
|| truth_value_p (TREE_CODE (rhs)))
return;
/* Don't warn for !x == 0 or !y != 0, those are equivalent to

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-08-29 Marek Polacek <polacek@redhat.com>
PR c/77292
* c-c++-common/Wlogical-not-parentheses-1.c: New test.
2016-08-29 Tom de Vries <tom@codesourcery.com>
PR c/77398

26
gcc/testsuite/c-c++-common/Wlogical-not-parentheses-1.c Normal file
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@ -0,0 +1,26 @@
/* PR c/77292 */
/* { dg-do compile } */
/* { dg-options "-Wlogical-not-parentheses" } */
/* Test that we don't warn if rhs is a comparison or a logical op. */
int
foo (int a, int b)
{
int r = 0;
r += !a == (a < b);
r += !a == (a > b);
r += !a == (a >= b);
r += !a == (a <= b);
r += !a == (a != b);
r += !a == (a == b);
r += !a == (a || b);
r += !a == (a && b);
r += !a == (!b);
r += !a == (a ^ b); /* { dg-warning "logical not is only applied to the left hand side of comparison" } */
r += !a == (a | b); /* { dg-warning "logical not is only applied to the left hand side of comparison" } */
r += !a == (a & b); /* { dg-warning "logical not is only applied to the left hand side of comparison" } */
return r;
}