diff options
Diffstat (limited to 'gcc/c')
| -rw-r--r-- | gcc/c/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/c/c-typeck.c | 23 |
2 files changed, 28 insertions, 1 deletions
diff --git a/gcc/c/ChangeLog b/gcc/c/ChangeLog index b561fa0..a0cab87 100644 --- a/gcc/c/ChangeLog +++ b/gcc/c/ChangeLog @@ -1,3 +1,9 @@ +2015-11-19 Marek Polacek <polacek@redhat.com> + + PR c/68412 + * c-typeck.c (parser_build_binary_op): Properly handle + C_MAYBE_CONST_EXPR before calling warn_tautological_cmp. + 2015-11-17 David Malcolm <dmalcolm@redhat.com> * c-parser.c (set_c_expr_source_range): Bulletproof both diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c index c18c307..5cb0f7e 100644 --- a/gcc/c/c-typeck.c +++ b/gcc/c/c-typeck.c @@ -3512,7 +3512,28 @@ parser_build_binary_op (location_t location, enum tree_code code, code1, arg1.value, code2, arg2.value); if (warn_tautological_compare) - warn_tautological_cmp (location, code, arg1.value, arg2.value); + { + tree lhs = arg1.value; + tree rhs = arg2.value; + if (TREE_CODE (lhs) == C_MAYBE_CONST_EXPR) + { + if (C_MAYBE_CONST_EXPR_PRE (lhs) != NULL_TREE + && TREE_SIDE_EFFECTS (C_MAYBE_CONST_EXPR_PRE (lhs))) + lhs = NULL_TREE; + else + lhs = C_MAYBE_CONST_EXPR_EXPR (lhs); + } + if (TREE_CODE (rhs) == C_MAYBE_CONST_EXPR) + { + if (C_MAYBE_CONST_EXPR_PRE (rhs) != NULL_TREE + && TREE_SIDE_EFFECTS (C_MAYBE_CONST_EXPR_PRE (rhs))) + rhs = NULL_TREE; + else + rhs = C_MAYBE_CONST_EXPR_EXPR (rhs); + } + if (lhs != NULL_TREE && rhs != NULL_TREE) + warn_tautological_cmp (location, code, lhs, rhs); + } if (warn_logical_not_paren && TREE_CODE_CLASS (code) == tcc_comparison |