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stmt.c (warn_if_unused_value): Don't warn if the expression has side effects. 

* stmt.c (warn_if_unused_value): Don't warn if the expression
        has side effects.

From-SVN: r37448
This commit is contained in:
Richard Henderson 2000-11-14 01:51:46 -08:00 committed by Richard Henderson
parent 0caa3c8e09
commit 6f1225504f
2 changed files with 7 additions and 3 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
2000-11-14 Richard Henderson <rth@redhat.com>
* stmt.c (warn_if_unused_value): Don't warn if the expression
has side effects.
* c-typeck.c (c_sizeof): Fold result to c_size_type_node.
(c_sizeof_nowarn, c_alignof, c_alignof_expr): Likewise.

7
gcc/stmt.c
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@ -2004,9 +2004,6 @@ warn_if_unused_value (exp)
case TRY_CATCH_EXPR:
case WITH_CLEANUP_EXPR:
case EXIT_EXPR:
/* We don't warn about COND_EXPR because it may be a useful
construct if either arm contains a side effect. */
case COND_EXPR:
return 0;
case BIND_EXPR:
@ -2067,6 +2064,10 @@ warn_if_unused_value (exp)
&& TREE_THIS_VOLATILE (exp))
return 0;
/* If this is an expression with side effects, don't warn. */
if (TREE_SIDE_EFFECTS (exp))
return 0;
/* If this is an expression which has no operands, there is no value
to be unused. There are no such language-independent codes,
but front ends may define such. */