gold patch committed: Reverse .ctors in .init_array

[Ian Lance Taylor]

Alan pointed out that when a .ctors sections which has multiple words is
mapped to a .init_array section, we need to reverse the order of the
entries in the .ctors section.  This is because .ctors and .init_array
are executed in reverse order, and we don't want the linker to change
the order in which the constructors are executed.  The same applies to
.dtors mapped to .fini_array.  This patch implements that in gold.
Committed to mainline.

Ian


2011-06-24  Ian Lance Taylor  <iant@google.com>

	* layout.cc: Include "object.h".
	(ctors_sections_in_init_array): New static variable.
	(Layout::is_ctors_in_init_array): New function.
	(Layout::layout): Add entry to ctors_sections_in_init_array if
	appropriate.
	* layout.h (class Layout): Declare is_ctors_in_init_array.
	* reloc.cc (Sized_relobj_file::do_relocate): Call reverse_words if
	is_ctors_reverse_view is set.
	(Sized_relobj_file::write_sections): Add layout parameter.  Change
	all callers.  Set is_ctors_reverse_view field of View_size.
	(Sized_relobj_file::reverse_words): New function.
	* object.h (Sized_relobj_file::View_size): Add
	is_ctors_reverse_view field.
	(class Sized_relobj_file): Update declarations.
	* testsuite/initpri3.c: New test.
	* testsuite/Makefile.am: (check_PROGRAMS): Add initpri3a and
	initpri3b.
	(initpri3a_SOURCES, initpri3a_DEPENDENCIES): New variables.
	(initpri3a_LDFLAGS, initpri3a_LDADD): New variables.
	(initpri3b_SOURCES, initpri3b_DEPENDENCIES): New variables.
	(initpri3b_LDFLAGS, initpri3b_LDADD): New variables.
	* testsuite/Makefile.in: Rebuild.


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