tree.h: Declare folding_initializer.

gcc:

	* tree.h: Declare folding_initializer.
	* builtins.c (fold_builtin_constant_p): Give definite answer
	if folding inside an initializer.
	* fold-const.c: Define folding_initializer.
	(START_FOLD_INIT): Save and then set folding_initializer.
	(END_FOLD_INIT): Restore folding_initializer.

gcc/testsuite:

        * gcc.c-torture/compile/builtin_constant_p.c: New test.

From-SVN: r114358

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 55a5d8f..b377e38 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -4142,6 +4142,10 @@ extern void using_eh_for_cleanups (void);
 
 /* In fold-const.c */
 
+/* Non-zero if we are folding constants inside an initializer; zero
+   otherwise.  */
+extern int folding_initializer;
+
 /* Fold constants as much as possible in an expression.
    Returns the simplified expression.
    Acts only on the top level of the expression;