This addresses a long-standing problem where a work-around for an unwinder
issue (also a regression) regresses other functionality. The patch replaces
several work-arounds with a fix for PR80556 and a work-around for PR88590.
* The fix for PR80556 requires a bump to the SO name for libgcc_s, since we
need to remove the unwinder symbols from it. This would trigger PR88590
hence the work-around for that.
* We weaken the symbols for emulated TLS support so that it is possible
for a DSO linked with static-libgcc to interoperate with a DSO linked with
libgcc_s. Likewise main exes.
* We remove all the gcc-4.2.1 era stubs machinery and workarounds.
* libgcc is always now linked ahead of libc, which avoids fails where the
libc (libSystem) builtins implementations are not up to date.
* The unwinder now always comes from the system
- for Darwin9 from /usr/lib/libgcc_s.1.dylib
- for Darwin10 from /usr/lib/libSystem.dylib
- for Darwin11+ from /usr/lib/system/libunwind.dylib.
We still insert a shim on Darwin10 to fix an omitted unwind function, but
the underlying unwinder remains the system one.
* The work-around for PR88590 has two parts (1) we always link libgcc from
its convenience lib on affected system versions (avoiding the need to find
the DSO path); (2) we add and export the emutls functions from DSOs - this
makes a relatively small (20k) addition to a DSO. These can be backed out
when a proper fix for PR88590 is committed.
For distributions that wish to install a libgcc_s.1.dylib to satisfy linkage
from exes that linked against the stubs can use a reexported libgcc_s.1.1
(since that contains all the symbols that were previously exported via the
stubs).
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:
PR target/80556
* config/darwin-driver.c (darwin_driver_init): Handle exported
symbols and symbol lists (suppress automatic export of the TLS
symbols).
* config/darwin.c (darwin_rename_builtins): Remove workaround.
* config/darwin.h (LINK_GCC_C_SEQUENCE_SPEC): Likewise.
(REAL_LIBGCC_SPEC): Handle revised library uses.
* config/darwin.opt (nodefaultexport): New.
* config/i386/darwin.h (PR80556_WORKAROUND): Remove.
* config/i386/darwin32-biarch.h (PR80556_WORKAROUND): Likewise.
* config/i386/darwin64-biarch.h (PR80556_WORKAROUND): Likewise.
libgcc/ChangeLog:
* config.host: Add weak emutls crt to the extra_parts.
* config/i386/darwin-lib.h (DECLARE_LIBRARY_RENAMES): Remove
workaround.
* config/libgcc-libsystem.ver: Add exclude list for the system-
provided unwinder.
* config/t-slibgcc-darwin: Bump SO version, remove stubs code.
* config/i386/libgcc-darwin.10.4.ver: Removed.
* config/i386/libgcc-darwin.10.5.ver: Removed.
* config/rs6000/libgcc-darwin.10.4.ver: Removed.
* config/rs6000/libgcc-darwin.10.5.ver: Removed.
* config/t-darwin-noeh: New file.
gcc/testsuite/ChangeLog:
* gcc.dg/torture/fp-int-convert-timode-3.c: Remove XFAIL.
* gcc.dg/torture/fp-int-convert-timode-4.c: Likewise.
d4943ce939