Use cast to void instead of the attribute to indicate unused arguments

(refactoring)

* CMakeLists.txt [BORLAND] (add_compile_options): Remove "/w-par";
reorder options.
* CMakeLists.txt [!BORLAND && MSVC] (add_compile_options): Remove
"/wd4100"; update comment.
* NT_MAKEFILE (.c.obj): Likewise.
* allchblk.c [!NO_DEBUGGING || GC_ASSERTIONS] (add_hb_sz): Use
UNUSED_ARG() instead of GC_ATTR_UNUSED.
* allchblk.c [USE_MUNMAP] (GC_adjust_num_unmapped): Likewise.
* backgraph.c [MAKE_BACK_GRAPH] (pop_in_progress, reset_back_edge,
update_max_height): Likewise.
* checksums.c [CHECKSUMS] (GC_add_block): Likewise.
* darwin_stop_world.c (GC_stack_range_for): Likewise.
* dbg_mlc.c (GC_store_debug_info_inner, GC_debug_change_stubborn,
GC_check_heap_block): Likewise.
* finalize.c [!GC_NO_FINALIZATION] (GC_null_finalize_mark_proc):
Likewise.
* gcj_mlc.c [GC_GCJ_SUPPORT] (GC_gcj_fake_mark_proc): Likewise.
* mallocx.c [!CPPCHECK] (GC_change_stubborn): Likewise.
* mark.c (GC_noop6, clear_marks_for_block): Likewise.
* mark.c [WRAP_MARK_SOME && (MSWIN32 || MSWINCE) && __GNUC__]
(mark_ex_handler): Likewise.
* mark.c [GC_DISABLE_INCREMENTAL] (GC_push_conditional): Likewise.
* mark_rts.c (GC_push_current_stack, GC_push_roots): Likewise.
* misc.c (GC_default_oom_fn, GC_set_handle_fork): Likewise.
* misc.c [THREADS && !SIGNAL_BASED_STOP_WORLD] (GC_set_suspend_signal,
GC_set_thr_restart_signal): Likewise.
* misc.c [THREADS && UNIX_LIKE && !NO_GETCONTEXT]
(callee_saves_pushed_dummy_fn): Likewise.
* misc.c [!THREADS] (GC_do_blocking_inner): Likewise.
* misc.c [!PARALLEL_MARK] (GC_set_markers_count): Likewise.
* os_dep.c [OPENBSD] (GC_fault_handler_openbsd): Likewise.
* os_dep.c [NEED_FIND_LIMIT || WRAP_MARK_SOME && !MSWIN32 && !MSWINCE
|| USE_PROC_FOR_LIBRARIES && THREADS] (GC_fault_handler): Likewise.
* os_dep.c [!HAVE_GET_STACK_BASE && !NEED_FIND_LIMIT]
(GC_get_stack_base): Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN] (catch_exception_raise_state,
catch_exception_raise_state_identity, catch_exception_raise): Likewise.
* pthread_stop_world.c [!NACL && !GC_OPENBSD_UTHREADS
&& !SUSPEND_HANDLER_NO_CONTEXT] (GC_suspend_sigaction): Likewise.
* pthread_stop_world.c [!NACL && !GC_OPENBSD_UTHREADS]
(GC_suspend_handler_inner): Likewise.
* pthread_support.c (GC_do_blocking_inner): Likewise.
* pthread_support.c [GC_ENABLE_SUSPEND_THREAD
&& SIGNAL_BASED_STOP_WORLD] (GC_suspend_self_blocked): Likewise.
* tests/gctest.c [!DBG_HDRS_ALL] (fail_proc1): Likewise.
* tests/gctest.c [(MSWIN32 && !__MINGW32__ || MSWINCE)
&& !NO_WINMAIN_ENTRY] (WinMain): Likewise.
* tests/gctest.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS
&& CPPCHECK && RTEMS] (Init): Likewise.
* tests/gctest.c [GC_WIN32_THREADS && !GC_PTHREADS] (thr_run_one_test):
Likewise.
* tests/gctest.c [MSWINCE] (thr_window): Likewise.
* tests/gctest.c [GC_PTHREADS] (thr_run_one_test): Likewise.
* typd_mlc.c (GC_array_mark_proc): Likewise.
* win32_threads.c (GC_register_altstack, GC_do_blocking_inner):
Likewise.
* win32_threads.c [!GC_PTHREADS && !GC_NO_THREADS_DISCOVERY]
(GC_DllMain): Likewise.
* cord/cordxtra.c (CORD_ATTR_UNUSED): Remove.
* include/private/gc_priv.h [!GC_ATTR_UNUSED] (GC_ATTR_UNUSED):
Likewise.
* cord/cordxtra.c (CORD_nul_func): Cast unused argument to void instead
of using CORD_ATTR_UNUSED.
* cord/cordxtra.c [!GC_NO_FINALIZATION] (CORD_lf_close_proc): Likewise.
* include/private/gc_priv.h [!UNUSED_ARG] (UNUSED_ARG): Define macro.

1 files changed, 3 insertions, 4 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c2fc136a..29c31dde 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,11 +130,10 @@ endif()
 # Output all warnings.
 if (BORLAND)
   # All warnings except for particular ones.
-  add_compile_options(/w /w-pro /w-aus /w-par /w-ccc /w-inl /w-rch)
+  add_compile_options(/w /w-aus /w-ccc /w-inl /w-pro /w-rch)
 elseif (MSVC)
-  # All warnings but ignoring "unreferenced formal parameter" and
-  # "conditional expression is constant" ones.
-  add_compile_options(/W4 /wd4100 /wd4127)
+  # All warnings but ignoring "conditional expression is constant" one.
+  add_compile_options(/W4 /wd4127)
   # Disable crt security warnings, since unfortunately they warn about all
   # sorts of safe uses of strncpy.
   add_definitions("-D_CRT_SECURE_NO_DEPRECATE")