PR c/88172 - attribute aligned of zero silently accepted but ignored

PR c/88172 - attribute aligned of zero silently accepted but ignored
PR testsuite/88208 - new test case c-c++-common/builtin-has-attribute-3.c in r266335 has multiple excess errors

gcc/ChangeLog:

	PR c/88172
	PR testsuite/88208
	* doc/extend.texi (attribute constructor): Clarify.

gcc/c/ChangeLog:

	PR c/88172
	PR testsuite/88208
	* c-decl.c (declspec_add_alignas): Adjust call to check_user_alignment.

gcc/c-family/ChangeLog:

	PR c/88172
	PR testsuite/88208
	* c-attribs.c (common_handle_aligned_attribute): Silently avoid setting
	alignments to values less than the target requires.
	(has_attribute): For attribute aligned consider both the attribute
	and the alignment bits.
	* c-common.c (c_init_attributes): Optionally issue a warning for
	zero alignment.

gcc/testsuite/ChangeLog:

	PR c/88172
	PR testsuite/88208
	* gcc.dg/attr-aligned-2.c: New test.
	* gcc.dg/builtin-has-attribute.c: Adjust.
	* c-c++-common/builtin-has-attribute-2.c: Same.
	* c-c++-common/builtin-has-attribute-3.c: Same.
	* c-c++-common/builtin-has-attribute-4.c: Same.
	* c-c++-common/builtin-has-attribute-5.c: New test.
	* gcc.target/aarch64/attr-aligned.c: Same.
	* gcc.target/i386/attr-aligned.c: Same.
	* gcc.target/powerpc/attr-aligned.c: Same.
	* gcc.target/sparc/attr-aligned.c: Same.

From-SVN: r266633

1 files changed, 4 insertions, 16 deletions

diff --git a/gcc/testsuite/c-c++-common/builtin-has-attribute-3.c b/gcc/testsuite/c-c++-common/builtin-has-attribute-3.c
index 237dc72..f048059 100644
--- a/gcc/testsuite/c-c++-common/builtin-has-attribute-3.c
+++ b/gcc/testsuite/c-c++-common/builtin-has-attribute-3.c
@@ -35,7 +35,7 @@ ATTR (alias ("fnoreturn")) void falias (void);
 void test_aligned (void)
 {
   A (0, fnone, aligned);
-  A (0, fnone, aligned (0));
+  A (0, fnone, aligned (0));            /* { dg-warning "requested alignment .0. is not a positive power of 2" } */
   A (0, fnone, aligned (1));
   A (0, fnone, aligned (2));
   A (0, fnone, aligned (4));
@@ -43,18 +43,18 @@ void test_aligned (void)
   A (0, fnone, aligned (16));
 
   A (1, faligned, aligned);
-  A (0, faligned, aligned (0));
+  A (0, faligned, aligned (0));         /* { dg-warning "requested alignment .0. is not a positive power of 2" } */
   A (0, faligned, aligned (1));
   A (0, faligned, aligned (2));
 
   A (1, faligned_1, aligned);
-  A (0, faligned_1, aligned (0));
+  A (0, faligned_1, aligned (0));       /* { dg-warning "requested alignment .0. is not a positive power of 2" } */
   A (1, faligned_1, aligned (1));
   A (0, faligned_1, aligned (2));
   A (0, faligned_1, aligned (4));
 
   A (1, faligned_2, aligned);
-  A (0, faligned_2, aligned (0));
+  A (0, faligned_2, aligned (0));       /* { dg-warning "requested alignment .0. is not a positive power of 2" } */
   A (0, faligned_2, aligned (1));
   A (1, faligned_2, aligned (2));
   A (0, faligned_2, aligned (4));
@@ -193,18 +193,6 @@ void test_ctor_dtor (void)
 
   A (1, fctor_dtor, constructor);
   A (1, fctor_dtor, destructor);
-
-  extern ATTR (constructor (123)) void fctor_123 (void);
-  A (1, fctor_123, constructor);
-  A (0, fctor_123, destructor);
-  A (1, fctor_123, constructor (123));
-  A (0, fctor_123, constructor (124));
-
-  extern ATTR (destructor (234)) void fctor_123 (void);
-  A (1, fctor_123, constructor (123));
-  A (1, fctor_123, destructor);
-  A (1, fctor_123, destructor (234));
-  A (0, fctor_123, destructor (235));
 }