Undo previous; breaks macppc/m68k (at least)

Avoid duplicate definitions on arm (reported by kre@)

Allow both array and non-array constructors for transition.

.eh_frame should be read-only on MIPS too.

For some mind-boogling reasons, GCC 5.4 believes that a weak reference
cannot alias with an extern. While this is clearly bogus, avoid yet
another alias handling bug and use strong aliases. It's actu

For some mind-boogling reasons, GCC 5.4 believes that a weak reference
cannot alias with an extern. While this is clearly bogus, avoid yet
another alias handling bug and use strong aliases. It's actually
slightly simpler, too.

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Fun fact of the weak: a weak reference doesn't have visibility attached.
As such, reorganize the start/end references to use a weak reference
only, if we use it to remove size knowledge. Otherwise us

Fun fact of the weak: a weak reference doesn't have visibility attached.
As such, reorganize the start/end references to use a weak reference
only, if we use it to remove size knowledge. Otherwise use weak
external declarations.

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Make older GCC and Clang happy and use weak references to the elements,
not declared as arrays.

PR toolchain/51121:
__CTOR_LIST__ and __CTOR_LIST_END__ are logically the same object, but
due to the start marker, the former has to be declared as array of fixed
size. Newer GCC versions take the l

PR toolchain/51121:
__CTOR_LIST__ and __CTOR_LIST_END__ are logically the same object, but
due to the start marker, the former has to be declared as array of fixed
size. Newer GCC versions take the liberty of exploiting the UB of
accessing global objects past the end to unconditionally load zero
values in that case. Two fixes are possible:
(1) Pruning via inline assembler as done by GCC's own CRT copy.
(2) Pruning via weak references as done for linker sets.
Since the second part is known and required to work anyway, prefer this
approach. In theory, the labels could be replaced completely, except
that GNU as doesn't provide start/end symbols for sections containing
dots.

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Make EHABI optional.

Also make sure the __CTOR_LIST__ is just aligned to a pointer boundary.
By default, mips N32 will aligned to a 64-bit boundary not 32-bit
which causes an extra NULL entry to be added.
Fix "segfault o

Also make sure the __CTOR_LIST__ is just aligned to a pointer boundary.
By default, mips N32 will aligned to a 64-bit boundary not 32-bit
which causes an extra NULL entry to be added.
Fix "segfault on exit" several people have noticed on mips N32,
caused by a jr to a NULL address.

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Make sure the __CTOR_LIST__ is just aligned to a pointer boundary.
By default, mips N32 will aligned to a 64-bit boundary not 32-bit
which causes an extra NULL entry to be added.

Include crtbegin.h first to make it possible to build with the stricter
attribute consistency checks in clang.

MIPS wants a read/write eh_frame.

Put the ctors code in .text.startup and dtors code in .text.exit

Switch arm, earm, powerpc to use crtbegin.c
Use -fpie for crtbegin.

Make dwarf_eh_object is 8 words long

Add a common crtbegin.c file and use a machine dependent crtbegin.h to
fill in .init/.fini.
Add mips support for USE_COMPILERCRTSTUFF=no (compiled only)