c++: init_priority and SUPPORTS_INIT_PRIORITY [PR107638]

The commit r13-3706-gd0a492faa6478c for fixing the result of
__has_attribute(init_priority) causes a bootstrap failure on hppa64-hpux
due to assuming the macro SUPPORTS_INIT_PRIORITY expands to a simple
constant, but on this target the macro is defined as

  #define SUPPORTS_INIT_PRIORITY (TARGET_GNU_LD ? 1 : 0)

(where TARGET_GNU_LD expands to something in terms of global_options)
which means we can't use the macro to conditionally exclude the entry
for init_priority when defining the cxx_attribute_table.

So instead of trying to exclude init_priority from the attribute table,
this patch just makes __has_attribute handle init_priority specially.

	PR c++/107638

gcc/c-family/ChangeLog:

	* c-lex.cc (c_common_has_attribute): Return 1 for init_priority
	iff SUPPORTS_INIT_PRIORITY.

gcc/cp/ChangeLog:

	* tree.cc (cxx_attribute_table): Don't conditionally exclude
	the init_priority entry.
	(handle_init_priority_attribute): Remove ATTRIBUTE_UNUSED.
	Return error_mark_node if !SUPPORTS_INIT_PRIORITY.

0 files changed, 0 insertions, 0 deletions