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re PR c/39889 (Bogus -Wunused-value warning) 

PR c/39889
	* stmt.c (warn_if_unused_value): Look through NON_LVALUE_EXPR.

	* gcc.dg/Wunused-value-3.c: New test.

From-SVN: r146812
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Jakub Jelinek 2009-04-26 20:53:41 +02:00 committed by Jakub Jelinek
parent 14ea0ed587
commit 78287916d5
4 changed files with 20 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-04-26 Jakub Jelinek <jakub@redhat.com>
PR c/39889
* stmt.c (warn_if_unused_value): Look through NON_LVALUE_EXPR.
2009-04-24 Andreas Krebbel <krebbel1@de.ibm.com>
* config/s390/constraints.md ('I', 'J'): Fix condition.

1
gcc/stmt.c
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@ -1418,6 +1418,7 @@ warn_if_unused_value (const_tree exp, location_t locus)
goto restart;
case SAVE_EXPR:
case NON_LVALUE_EXPR:
exp = TREE_OPERAND (exp, 0);
goto restart;

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2009-04-26 Jakub Jelinek <jakub@redhat.com>
PR c/39889
* gcc.dg/Wunused-value-3.c: New test.
2009-04-24 Paolo Bonzini <bonzini@gnu.org>
PR middle-end/39867

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gcc/testsuite/gcc.dg/Wunused-value-3.c Normal file
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@ -0,0 +1,9 @@
/* PR c/39889 */
/* { dg-do compile } */
/* { dg-options "-Wunused-value" } */
int x;
int foo (void)
{
return (1 ? x = 0 : (void) 0), 0; /* { dg-bogus "value computed is not used" } */
}