diff options
Diffstat (limited to 'gcc/gimplify.c')
| -rw-r--r-- | gcc/gimplify.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/gcc/gimplify.c b/gcc/gimplify.c index 8ec6e0d..679103e 100644 --- a/gcc/gimplify.c +++ b/gcc/gimplify.c @@ -665,7 +665,19 @@ copy_if_shared_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, /* Otherwise, mark the tree as visited and keep looking. */ else - TREE_VISITED (t) = 1; + { + TREE_VISITED (t) = 1; + if (TREE_CODE (*tp) == VA_ARG_EXPR) + { + /* Mark any _DECL inside the operand as volatile to avoid + the optimizers messing around with it. We have to do this + early, otherwise we might mark a variable as volatile + after we gimplify other statements that use the variable + assuming it's not volatile. */ + walk_tree (&TREE_OPERAND (*tp, 0), mark_decls_volatile_r, + NULL, NULL); + } + } return NULL_TREE; } |