Ensure oom_fn callback executed on out-of-memory in calloc
(fix commits e10c1eb, 4e1a6f9)

* malloc.c [REDIRECT_MALLOC && !REDIRECT_MALLOC_IN_HEADER] (calloc):
Call oom_fn(SIZE_MAX) (instead of returning NULL) if n*lb overflows.
* typd_mlc.c (GC_calloc_explicitly_typed): Likewise.
* typd_mlc.c (GC_calloc_explicitly_typed): If register_disappearing_link
failed due to lack of memory then call oom_fn(lb) instead of
GC_malloc(lb); update comment.

Workaround 'function is never used' cppcheck style warnings

* tests/test.c [DBG_HDRS_ALL || MAKE_BACK_GRAPH] (GC_DEBUG): Do not
define if CPPCHECK.
* tests/test.c (NO_TEST_HANDLE_FORK): Define also if not GC_PTHREADS;
do not define if CPPCHECK.
* tests/test.c: Include gc_inline.h, javaxfc.h if CPPCHECK.
* tests/test.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS] (main): Call
GC_noop1(&WinMain) if CPPCHECK and not NO_WINMAIN_ENTRY; call
GC_noop1(&Init) if CPPCHECK and RTEMS.
* tests/test.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS && CPPCHECK]
(UNTESTED): New macro.
* tests/test.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS && CPPCHECK]
(main): Call UNTESTED() for GC_debug_end_stubborn_change,
GC_debug_generic_or_special_malloc, GC_debug_register_displacement,
GC_post_incr, GC_pre_incr, GC_debug_gcj_malloc, GC_amiga_get_mem,
GC_amiga_set_toany, GC_MacTemporaryNewPtr, test, GetFileLineFromStack,
GetModuleNameFromStack, GetSymbolNameFromStack, GC_get_bytes_since_gc,
GC_get_dont_expand, GC_get_dont_precollect, GC_get_finalize_on_demand,
GC_get_finalizer_notifier, GC_get_find_leak,
GC_get_force_unmap_on_gcollect, GC_get_free_bytes,
GC_get_free_space_divisor, GC_get_full_freq, GC_get_java_finalization,
GC_get_max_retries, GC_get_no_dls, GC_get_non_gc_bytes,
GC_get_on_collection_event, GC_get_on_heap_resize,
GC_get_pages_executable, GC_get_push_other_roots, GC_get_start_callback,
GC_get_stop_func, GC_get_time_limit, GC_get_warn_proc, GC_is_disabled,
GC_set_dont_precollect, GC_set_finalize_on_demand,
GC_set_finalizer_notifier, GC_set_free_space_divisor, GC_set_full_freq,
GC_set_java_finalization, GC_set_max_retries, GC_set_no_dls,
GC_set_non_gc_bytes, GC_set_on_collection_event, GC_set_on_heap_resize,
GC_set_oom_fn, GC_set_pages_executable, GC_set_push_other_roots,
GC_set_start_callback, GC_set_stop_func, GC_set_time_limit,
GC_malloc_explicitly_typed_ignore_off_page, GC_debug_change_stubborn,
GC_debug_strndup, GC_strndup, GC_posix_memalign, GC_new_free_list,
GC_new_kind, GC_new_proc, GC_clear_roots, GC_exclude_static_roots,
GC_expand_hp, GC_register_describe_type_fn,
GC_register_has_static_roots_callback, GC_get_abort_func,
GC_set_abort_func, GC_gcj_malloc_ignore_off_page, GC_dump_regions,
GC_is_tmp_root, GC_print_free_list, GC_print_trace,
GC_debug_register_finalizer_unreachable, GC_get_await_finalize_proc,
GC_register_disappearing_link, GC_set_await_finalize_proc,
GC_should_invoke_finalizers, GC_finalize_all, GC_dump_finalization,
GC_get_toggleref_func, GC_set_toggleref_func, GC_toggleref_add,
GC_set_log_fd, GC_allow_register_threads, GC_get_on_thread_event,
GC_register_altstack, GC_set_on_thread_event, GC_pthread_detach,
GC_dlopen, GC_pthread_cancel, GC_pthread_exit, GC_pthread_sigmask,
GC_set_suspend_signal, GC_set_thr_restart_signal, GC_ExitThread,
GC_beginthreadex, GC_endthreadex, strndup, strdup, realloc, GC_wcsdup,
GC_debug_wcsdup.
* tests/test.c [!NO_WINMAIN_ENTRY] (WinMain): Call GC_noop1(&WinMain)
if CPPCHECK.
* tests/test.c [PCR] (test): Call GC_noop1(&PCR_GC_Run),
GC_noop1(&PCR_GC_Setup) if CPPCHECK.

Fix assertion violation in mark_local checking GC_mark_stack_top

* mark.c (GC_mark_local): Replace AO_load with AO_load_acquire in
the assertion comparing global_first_nonempty to GC_mark_stack_top.

Workaround 'GC_DllMain is never used' cppcheck style warning

* win32_threads.c [GC_WIN32_THREADS] (GC_init_parallel): Call
GC_noop1(&GC_DllMain) if CPPCHECK (and not GC_NO_THREADS_DISCOVERY).

Workaround 'WinMain() is never used' cppcheck false warning

* tests/test_cpp.cc [!NO_WINMAIN_ENTRY] (WinMain): Call
GC_noop1(&WinMain) if CPPCHECK.

Workaround 'operator delete[]/new[] never used' cppcheck false warning

* gc_cpp.cc [!_MSC_VER && GC_OPERATOR_NEW_ARRAY] (operator new[],
operator delete[]): Do not define if CPPCHECK.

Fix 'incompatible ptr-to-int conversion' compiler warning in push_all_stack

* mark_rts.c [TRACE_BUF] (GC_push_all_stack_partially_eager): Add
explicit cast to word for GC_add_trace_entry bottom/top arguments.

Update README to use autogen.sh on build from the source repository

* README.md (Installation and Portability): Replace autoreconf (and
automake) invocation with autogen.sh one; pass -j option to make.

Update AUTHORS file (add Joshua Richardson)

Document configure 'syntax error' issue in README

* README.md (Installation and Portability): Add information how to
avoid "syntax error near unexpected token ATOMIC_OPS" configure failure
(caused by lack of pkg.m4).

Eliminate 'function result not used' code defect in GC_mark_local

* mark.c (GC_mark_local): Explicitly cast AO_compare_and_swap result to
void (to outline that the result is unused intentionally).

Add testing of new[]/delete[] (test_cpp)

* tests/test_cpp.cc (main): Add test case for new[] and delete[].

Fix register_finalizer call in disclaim_bench for GC_DEBUG

* tests/disclaim_bench.c (testobj_new): Call
GC_REGISTER_FINALIZER_NO_ORDER instead of GC_register_finalizer_no_order.

Support AddressSanitizer and MemorySanitizer (clang)

* include/private/gc_priv.h (GC_ATTR_NO_SANITIZE_ADDR,
GC_ATTR_NO_SANITIZE_MEMORY): New macro.
* include/private/gcconfig.h [__has_feature(address_sanitizer)]
(ADDRESS_SANITIZER): New macro.
* include/private/gcconfig.h [__has_feature(memory_sanitizer)]
(MEMORY_SANITIZER): Likewise.
* mach_dep.c (GC_with_callee_saves_pushed): Use
GC_ATTR_NO_SANITIZE_ADDR attribute.
* mark.c (GC_mark_from, GC_push_all_eager): Likewise.
* mark.c (GC_mark_from, GC_push_all_eager): Use
GC_ATTR_NO_SANITIZE_MEMORY attribute.
* os_dep.c [ADDRESS_SANITIZER && (UNIX_LIKE || NEED_FIND_LIMIT
|| MPROTECT_VDB)] (__asan_default_options): New function.
* os_dep.c [(NEED_FIND_LIMIT || UNIX_LIKE) && CPPCHECK
&& ADDRESS_SANITIZER] (GC_set_and_save_fault_handler):
Reference __asan_default_options.
* os_dep.c [MPROTECT_VDB && !DARWIN && CPPCHECK && ADDRESS_SANITIZER]
(GC_dirty_init): Likewise.
* tests/test.c [MEMORY_SANITIZER] (check_heap_stats): Increase
max_heap_sz by 25% (to avoid "Unexpected heap growth" error if MSan is
used).
* tests/test_cpp.cc [ADDRESS_SANITIZER || MEMORY_SANITIZER] (main):
Call GC_FREE(a) instead of delete a; add comment.

Fix potential integer overflow in GC_find_limit_* functions

* os_dep.c [OPENBSD] (GC_find_limit_openbsd, GC_skip_hole_openbsd): Add
assertion for the minimum value of bound; increment result by pgsz only
if no overflow is guaranteed.
* os_dep.c [USE_PROC_FOR_LIBRARIES && THREADS || NEED_FIND_LIMIT]
(GC_find_limit_with_bound): Add assertion for the minimum/maximum value
of bound; increment/decrement result by MIN_PAGE_SIZE only if no
overflow/underflow is guaranteed.

Fix GC_jmp_buf multiple definition

This error occurs only if "-fno-common" gcc option is specified.

* include/private/gc_priv.h [USE_PROC_FOR_LIBRARIES && THREADS
|| NEED_FIND_LIMIT] (GC_jmp_buf): Replace variable definition with
a declaration (as GC_EXTERN).
* os_dep.c [USE_PROC_FOR_LIBRARIES && THREADS || NEED_FIND_LIMIT]
(GC_jmp_buf): Define global variable (as GC_INNER).

Suppress 'tainted string passed to vulnerable operation' false defects

* include/private/gc_priv.h (TRUSTED_STRING): New tagging macro; add
comment.
* misc.c (GC_init): Process the result of GETENV("GC_LOG_FILE") by
TRUSTED_STRING.
* tools/if_mach.c (main): Process argv[3] by TRUSTED_STRING (before
passing the string to execvp).
* tools/if_not_there.c (main): Declare "fname" local variable;
process argv[1] and argv[2] by TRUSTED_STRING (before passing the
strings to fopen/opendir and execvp, respectively).

Do not define amiga_get_mem, MacTemporaryNewPtr unless really used (extra)

* extra/AmigaOS.c (GC_amiga_get_mem): Define only if GC_AMIGA_FASTALLOC.
* extra/MacOS.c (TemporaryMemoryBlock, TemporaryMemoryHandle,
struct TemporaryMemoryBlock, theTemporaryMemory,
GC_MacTemporaryNewPtr, perform_final_collection,
GC_MacFreeTemporaryMemory): Define only if USE_TEMPORARY_MEMORY.

Eliminate 'GC_record_fault is never used' cppcheck style warning

* checksums.c [CHECKSUMS] (GC_record_fault): Do not define unless
MPROTECT_VDB and not DARWIN.
* os_dep.c [MPROTECT_VDB && CHECKSUMS] (GC_record_fault): Do not
declare if DARWIN.

Change no-argument functions declaration style to ANSI C (extra files)

* extra/AmigaOS.c (GC_get_main_stack_base, GC_register_data_segments):
Replace "()" to "(void)" in the function prototype.
* extra/MacOS.c (GC_MacGetDataStart, perform_final_collection,
GC_MacFreeTemporaryMemory, GC_MacGetDataEnd): Likewise.
* extra/msvc_dbg.c (GetSymHandle): Likewise.

Replace C++ style comments to C ones, remove commented out code (extra)

* extra/AmigaOS.c (GC_amiga_get_mem, GC_amiga_allocwrapper_any,
GC_amiga_allocwrapper_fast): Replace the style of comments from C++
to C.
* extra/MacOS.c (CodeZeroPtr, GC_MacTemporaryNewPtr): Likewise.
* extra/Mac_files/MacOS_config.h: Likewise.
* extra/AmigaOS.c (GC_amiga_get_mem, GC_amiga_rec_alloc,
GC_amiga_allocwrapper_any, GC_amiga_allocwrapper_fast): Remove
commented out code.
* extra/Mac_files/MacOS_config.h: Likewise.

Update ChangeLog file

Update ChangeLog file (v7.6 changes only)

Update ChangeLog file (v7.2 - v7.4 changes only)
(Cherry-pick commit 88c54c0 from 'release-7_4' branch.)

Export GC_print_free_list()

Note: this function is not used by GC itself.

* include/gc_inline.h (GC_print_free_list): New public API prototype.
* reclaim.c [!NO_DEBUGGING]: Include gc_inline.h (to check that
GC_print_free_list prototype matches the definition).
* reclaim.c [!NO_DEBUGGING] (GC_print_free_list): Define as public
(GC_API+GC_CALL); remove "ok" local variable; add assertions about kind
and sz_in_granules maximum values.

Eliminate 'null dereference' code defect warning in register_finalizer

* finalize.c (GC_register_finalizer_inner): Add GC_ASSERT that fn is
non-zero (instead of specifying this in a comment) for the case when
new_fo is non-NULL (new_fo is returned by GC_oom_fn).
* finalize.c [LINT2] (GC_register_finalizer_inner): Call ABORT if hhdr
is NULL (for the case when new_fo is non-NULL).

Revert "Eliminate 'deref-of-null' static analyzer warning in register_finalizer"

This reverts commit 7547c377153ddd859bef6a2dd14c42e9f12aa0be.

Because it requires -D GC_ASSERTIONS.

Fix 'replacement operator delete cannot be inline' GCC warning (Cygwin)
(fix commits 83e0a2c, 3379238)

This commit also eliminates
"operator delete is missing exception specification throw()" compiler
warning.

* gc_cpp.cc (operator delete): Define unconditionally (i.e. for Cygwin
too).
* include/gc_cpp.h [__CYGWIN__]: Do not include "new" header.
* include/gc_cpp.h [__CYGWIN__] (operator delete): Remove (as
replacement function 'operator delete' cannot be declared 'inline').

Enable GC_is_tmp_root for all platforms

* mark_rts.c [!NO_DEBUGGING] (GC_is_tmp_root): Define for any platform
(not only for Win32); update comment.

Export GC_is_tmp_root() and GC_print_trace[_inner]()

Note: these 3 functions are not used by GC itself.

* include/gc_mark.h (GC_is_tmp_root, GC_print_trace,
GC_print_trace_inner): New public API prototype.
* mark.c [TRACE_BUF] (GC_print_trace_inner, GC_print_trace): Define as
public (GC_API+GC_CALL).
* mark_rts.c [MSWIN32 && !NO_DEBUGGING] (GC_is_tmp_root): Likewise.
* mark_rts.c [MSWIN32 && !NO_DEBUGGING] (GC_is_tmp_root): Replace
GC_bool return type with int, replace ptr_t argument type to void*
(because GC_bool and ptr_t are not exported from GC).

Allow custom TRACE_ENTRIES value

* mark.c [TRACE_BUF] (TRACE_ENTRIES): Do not define if already defined.

Export GC_dump_finalization/regions()

Note: these 2 functions are not used by GC itself.

* allchblk.c [!NO_DEBUGGING] (GC_dump_regions): Turn into a public
definition (add GC_API+GC_CALL).
* finalize.c [!NO_DEBUGGING] (GC_dump_finalization): Likewise.
* include/gc.h (GC_dump_regions, GC_dump_finalization): New public API
prototype.

Eliminate duplicate log messages in GC_mark_from

This change also eliminates 'bad copy-paste' code defect in GC_mark_from.

* mark.c [ENABLE_TRACE] (GC_mark_from): Combine 2 logged messages
about "large section" and "splitting" into a single one;
replace "Tracing from" logged message with "small object" message
(which is not logged for large objects).

Eliminate redundant local variable in register_finalizer

The variable caused a report about a code defect which is a false
positive.

* finalize.c (GC_register_finalizer_inner): Remove "base" local
variable (use "obj" argument instead).

Workaround 'insecure libc pseudo-random number generator used' code defect

* dbg_mlc.c [LINT2] (GC_random): New function.
* dbg_mlc.c [KEEP_BACK_PTRS && LINT2] (RANDOM): Define to GC_random.
* dbg_mlc.c [KEEP_BACK_PTRS && LINT2]: Do not include stdlib.h.
* dbg_mlc.c [KEEP_BACK_PTRS && !LINT2] (GC_RAND_MAX): Define.
* dbg_mlc.c (GC_generate_random_heap_address): Replace RAND_MAX with
GC_RAND_MAX.
* include/private/gc_priv.h [LINT2] (GC_RAND_MAX): New macro.
* include/private/gc_priv.h [LINT2] (GC_random): Prototype (as
GC_API_PRIV).
* tests/disclaim_bench.c [LINT2] (rand): Redefine to GC_random.
* tests/disclaim_test.c [LINT2] (rand): Likewise.
* tests/disclaim_test.c [LINT2]: Include private/gc_priv.h instead of
config.h.

Fix 'address of fudged_set is used out of scope' code defect (sigmask)
(fix commit 81d04a6)

* pthread_support.c [!GC_NO_PTHREAD_SIGMASK] (pthread_sigmask): Move
fudged_set to the outer scope where REAL_FUNC(pthread_sigmask) is
called (a pointer to fudged_set could be passed to the latter function).

Eliminate 'unsafe vsprintf is deprecated' compiler warning

Replacement of vsprintf to vsnprintf (or similar) if available.

Note that no buffer overflow occurs in CORD_vsprintf as buf is
allocated dynamically based on format string.

* cord/cordprnt.c (GC_VSNPRINTF): New macro (the definition is copied
from misc.c).
* cord/cordprnt.c (CORD_vsprintf): Replace vsprintf(buf,...) call with
GC_VSNPRINTF(buf,max_size+1,...).

Eliminate 'possible integer underflow' code defect (cord-de)

* cord/tests/de.c (generic_init): Replace initial==CORD_EMPTY check
with 0==len where len is CORD_len(initial) (to outline that len-1
cannot cause underflow).

Eliminate 'comparison of signed and unsigned int' GCC warning (test_cpp)
(fix commit 1868a90)

* tests/test_cpp.cc [LINT2] (main): Cast unsigned immediate value to
int (before comparison to n local variable).

Workaround 'pos_*, [r]iter, dump never used' cppcheck style warnings (cord)

* cord/tests/cordtest.c [CPPCHECK] (CORD_iter, CORD_next,
CORD_pos_fetch, CORD_pos_to_cord, CORD_pos_to_index, CORD_pos_valid,
CORD_prev): Undefine (at the beginning of the file).
* cord/tests/cordtest.c [CPPCHECK] (test_basics): Call CORD_pos_to_cord,
CORD_pos_to_index, CORD_iter, CORD_riter, CORD_dump; add TODO item.

Eliminate 'CORD_*printf is never used' cppcheck style warnings (cordtest)

Minimal testing of CORD_[v][f]printf is added to cordtest.

* cord/tests/cordtest.c: Include stdarg.h.
* cord/tests/cordtest.c: Reformat the comment describing cordtest.
* cord/tests/cordtest.c (wrap_vprintf, wrap_vfprintf): New function
(calling CORD_v[f]printf).
* cord/tests/cordtest.c (test_printf): Call CORD_printf, wrap_vfprintf,
wrap_vprintf for CORD_EMPTY (with the output to stdout); add TODO item.

Fix conditional expression in pos_fetch, next non-macro definitions (cord)

* cord/cordbscs.c (CORD_pos_fetch, CORD_next): Match the conditional
expression of the macro definition (of the same name) in cord_pos.h.

Workaround 'possible null pointer dereference' cppcheck warning (Darwin)

* darwin_stop_world.c [CPPCHECK] (GC_stack_range_for): Call ABORT if
p is NULL and thread_blocked is true.

Fix null dereference in GC_stack_range_for if not DARWIN_DONT_PARSE_STACK
(fix commit 4ceae609)

* darwin_stop_world.c (GC_stack_range_for): Use GC_ATTR_UNUSED for
paltstack_hi argument (because the latter is not used currently if
!DARWIN_DONT_PARSE_STACK); do not access p->altstack[_size] unless
DARWIN_DONT_PARSE_STACK; add TODO item.
* darwin_stop_world.c [!DARWIN_DONT_PARSE_STACK] (GC_push_all_stacks):
Do not use altstack_hi and altstack_lo; add TODO item.

Eliminate unreachable PROC/DEFAULT_VDB GC_printf calls in gctest main()

* tests/test.c [!GC_WIN32_THREADS && !GC_PTHREADS && !NO_INCREMENTAL
&& (MPROTECT_VDB || PROC_VDB || GWW_VDB) && !MAKE_BACK_GRAPH &&] (main):
Remove unreachable GC_printf call about DEFAULT_VDB; remove extra check
of GWW_VDB case.
* tests/test.c [GC_PTHREADS && MPROTECT_VDB && !REDIRECT_MALLOC
&& !MAKE_BACK_GRAPH && !USE_PROC_FOR_LIBRARIES && !NO_INCREMENTAL]
(main): Remove extra check of MPROTECT_VDB case; remove unreachable
GC_printf calls about PROC_VDB and DEFAULT_VDB.

Eliminate 'suspicious pointer subtraction' cppcheck warning (gc_cpp)

* include/gc_cpp.h (gc_cleanup::gc_cleanup): Define this_ptr void
pointer; use this_ptr instead of this keyword to outline that the
pointer subtraction is intentional (i.e., "this->" was not intended).

Revert "Workaround 'suspicious ptr subtraction' cppcheck warning in gc_cpp"

This reverts commit 363890b2ab8365dcc6b87a2a6c4752c1f710dcf2.

Because the warning is still reported by the recent versions of
cppcheck (as of Oct 2016).

Eliminate 'dereference of null' CSA false warning in array_mark_proc

The exact warning message is: Access to field 'mse_start' results in a
dereference of a null pointer (loaded from variable 'new_mark_stack_ptr').

Note: the warning is eliminated regardless of assertion checking status.

* typd_mlc.c (GC_array_mark_proc): Call ABORT if mark_stack_ptr is NULL
(thus orig_mark_stack_ptr is ensured to be non-NULL after the check).

Revert "Eliminate CSA false warning about null deref in array_mark_proc"

This reverts commit fc339c65ad0fffc2e5bc8332bab9c1c70329c04e.

Because that commit does not eliminate CSA false warning
if GC_ASSERTIONS is off.

Eliminate 'Condition 0==datastart always false' cppcheck warning (dyn_load)

* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Cast datastart to
char*volatile* before dereferencing and checking against NULL.

Workaround 'condition is always false' cppcheck warning in get_next_stack

* win32_threads.c [CPPCHECK] (GC_get_next_stack): Set thread a non-null
value (near current_min assignment) even if GC_win32_dll_threads (to
avoid cppcheck complain that if(thread!=0) is always false (thus
UNPROTECT_THREAD(thread) is never reached) if GC_DISCOVER_TASK_THREADS.

Workaround 'value of macro unknown' cppcheck info messages

The messages are eliminated for the macros: __int64, _SIGRTMIN,
ARM_THREAD_STATE32, ARM_UNIFIED_THREAD_STATE, FIXUP_POINTER,
GC_COLLECT_AT_MALLOC, GC_FREE_SPACE_DIVISOR, GC_FULL_FREQ,
GC_INITIAL_HEAP_SIZE, GC_MAX_RETRIES, GC_MAXIMUM_HEAP_SIZE,
GC_MIN_MARKERS, GC_SIG_SUSPEND, GC_SIG_THR_RESTART, GC_TIME_LIMIT,
HEURISTIC2_LIMIT, MAP_ANONYMOUS, RTLD_DI_LINKMAP, SAVE_CALL_COUNT,
SIZE_MAX.

* alloc.c (GC_full_freq, GC_free_space_divisor, GC_time_limit): Define
to default immediate value if CPPCHECK.
* darwin_stop_world.c [ARM32 && ARM_THREAD_STATE32]
(GC_ARM_UNIFIED_THREAD_STATE): New macro (defined to
ARM_UNIFIED_THREAD_STATE unless CPPCHECK).
* darwin_stop_world.c [ARM32 && ARM_THREAD_STATE32]
(GC_stack_range_for): Use GC_ARM_UNIFIED_THREAD_STATE; do not use value
of ARM_THREAD_STATE32 if CPPCHECK.
* dyn_load.c [!USE_PROC_FOR_LIBRARIES] (GC_RTLD_DI_LINKMAP): New macro
(defined to RTLD_DI_LINKMAP unless CPPCHECK).
* dyn_load.c [!USE_PROC_FOR_LIBRARIES] (GC_FirstDLOpenedLinkMap): Use
GC_RTLD_DI_LINKMAP.
* include/gc.h (GC_word, GC_signed_word): Do not define to __int64 if
CPPCHECK.
* include/gc.h (GC_INIT_CONF_MAX_RETRIES,
GC_INIT_CONF_FREE_SPACE_DIVISOR, GC_INIT_CONF_FULL_FREQ,
GC_INIT_CONF_TIME_LIMIT, GC_INIT_CONF_SUSPEND_SIGNAL,
GC_INIT_CONF_THR_RESTART_SIGNAL, GC_MAXIMUM_HEAP_SIZE,
GC_INITIAL_HEAP_SIZE): Define to empty if CPPCHECK.
* include/private/gc_priv.h [SIZE_MAX] (GC_SIZE_MAX): Do not define to
SIZE_MAX if CPPCHECK.
* include/private/gc_priv.h [DARWIN && ARM32
&& ARM_UNIFIED_THREAD_STATE] (GC_MACH_THREAD_STATE): Do not define to
ARM_UNIFIED_THREAD_STATE if CPPCHECK.
* include/private/gc_priv.h [GC_PTHREADS && _SIGRTMIN] (SIG_SUSPEND):
Do not define to _SIGRTMIN if CPPCHECK.
* pthread_stop_world.c [!SIG_THR_RESTART && _SIGRTMIN]
(SIG_THR_RESTART): Likewise.
* include/private/gcconfig.h [SAVE_CALL_CHAIN && SAVE_CALL_COUNT]
(NFRAMES): Define to immediate value (do not use value of
SAVE_CALL_COUNT) if CPPCHECK.
* include/private/gcconfig.h [!FIXUP_POINTER && POINTER_MASK]
(FIXUP_POINTER): Define to a sample expression (not using values of
POINTER_MASK and POINTER_SHIFT) if CPPCHECK.
* malloc.c [GC_COLLECT_AT_MALLOC] (GC_dbg_collect_at_malloc_min_lb):
Define to sample value (not using value of GC_COLLECT_AT_MALLOC) if
CPPCHECK.
* misc.c [GC_INITIAL_HEAP_SIZE] (GC_init): Define to default immediate
value if CPPCHECK.
* os_dep.c [!BEOS && !OS2 && !SWIN32 && !GC_OPENBSD_THREADS
&& !STACKBOTTOM && HEURISTIC2_LIMIT] (GC_get_main_stack_base): Do not
use value of HEURISTIC2_LIMIT if CPPCHECK.
* os_dep.c [USE_MMAP_ANON && MAP_ANONYMOUS] (OPT_MAP_ANON): Do not use
value of MAP_ANONYMOUS if CPPCHECK.
* pthread_stop_world.c [GC_ENABLE_SUSPEND_THREAD && !GC_TIME_LIMIT]
(GC_TIME_LIMIT): Do not define.
* pthread_stop_world.c [GC_ENABLE_SUSPEND_THREAD]
(GC_brief_async_signal_safe_sleep): Do not use value of GC_TIME_LIMIT
if CPPCHECK.
* pthread_support.c [PARALLEL_MARK && GC_MIN_MARKERS] (GC_thr_init):
Do not use value of GC_MIN_MARKERS if CPPCHECK.
* win32_threads.c [PARALLEL_MARK && GC_MIN_MARKERS] (GC_thr_init):
Likewise.
* tests/test.c [GC_DEBUG && SAVE_CALL_CHAIN && SAVE_CALL_COUNT]
(check_heap_stats): Use NFRAMES instead of SAVE_CALL_COUNT (i.e. do not
use value of SAVE_CALL_COUNT).

Workaround 'value of REDIRECT_MALLOC/FREE unknown' cppcheck info messages

* malloc.c [REDIRECT_MALLOC && !REDIRECT_MALLOC_IN_HEADER]
(REDIRECT_MALLOC_F): New macro (defined to REDIRECT_MALLOC unless
CPPCHECK).
* malloc.c [REDIRECT_MALLOC && !REDIRECT_MALLOC_IN_HEADER] (malloc,
calloc, strdup, strndup): Use REDIRECT_MALLOC_F instead of
REDIRECT_MALLOC.
* malloc.c [REDIRECT_FREE && !REDIRECT_MALLOC_IN_HEADER]
(REDIRECT_FREE_F): New macro (defined to REDIRECT_FREE unless
CPPCHECK).
* malloc.c [REDIRECT_FREE && !REDIRECT_MALLOC_IN_HEADER] (free): Use
REDIRECT_FREE_F instead of REDIRECT_FREE.

Workaround 'value of WINAPI unknown' cppcheck info messages

* include/gc.h [GC_WIN32_THREADS && WINAPI && !CPPCHECK]
(GC_WINDOWS_H_INCLUDED): New macro.
* include/gc.h [GC_WIN32_THREADS] (GC_WINDOWS_H_INCLUDED): Define also
if windows.h included.
* include/gc.h [GC_WIN32_THREADS]: Replace "#ifdef WINAPI" with
"#ifdef GC_WINDOWS_H_INCLUDED".

Workaround 'value of SIGBUS unknown' cppcheck info messages

* include/private/gcconfig.h [SIGBUS && !CPPCHECK] (HAVE_SIGBUS): New
macro.
* os_dep.c [NEED_FIND_LIMIT || UNIX_LIKE] (old_bus_handler,
GC_set_and_save_fault_handler, GC_reset_fault_handler): Replace
"ifdef SIGBUS" with "ifdef HAVE_SIGBUS".
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL]
(GC_remove_allowed_signals): Likewise.

Eliminate 'value of DATASTART2 unknown' cppcheck info messages

* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Replace
defined(DATASTART2) with defined(GC_HAVE_DATAREGION2).
* os_dep.c [!OS2 && !MSWIN32 && !OPENBSD] (GC_register_data_segments):
Likewise.
* include/private/gcconfig.h [DATASTART2] (GC_HAVE_DATAREGION2): New
macro.

Eliminate 'value of GC_PTHREAD_EXIT_ATTRIBUTE unknown' cppcheck messages

* include/gc_config_macros.h [GC_PTHREAD_EXIT_ATTRIBUTE]
(GC_HAVE_PTHREAD_EXIT): New macro.
* include/gc_config_macros.h: Replace defined(GC_PTHREAD_EXIT_ATTRIBUTE)
with defined(GC_HAVE_PTHREAD_EXIT).
* include/gc_pthread_redirects.h: Likewise.
* pthread_support.c: Likewise.

Eliminate 'value of GC_RETURN_ADDR_PARENT unknown' cppcheck info messages

* dbg_mlc.c [GC_ADD_CALLER]: Replace defined(GC_RETURN_ADDR_PARENT)
with defined(GC_HAVE_RETURN_ADDR_PARENT).
* include/private/gc_priv.h (GC_DBG_EXTRAS): Likewise.
* include/gc_config_macros.h [GC_RETURN_ADDR_PARENT]
(GC_HAVE_RETURN_ADDR_PARENT): New macro.

Eliminate 'value of CLOCK_TYPE unknown' cppcheck info message

* tests/disclaim_bench.c (main): Replace #ifdef CLOCK_TYPE
with #ifndef NO_CLOCK.

Fix 'ISO C90 does not support %lf, %lg gnu_printf formats' GCC warnings

* tests/disclaim_bench.c (main): Replace "%lf" printf format specifier
to "%f" one, and "%lg" one to "%g" one.

Workaround 'tainted int used as loop bound' static analysis tool warning

No need to check upper bound of n here, so a dummy check is added.

* tests/test_cpp.cc (main) [LINT2]: Check upper bound of n local
variable (the check is actually dummy).
* tests/test_cpp.cc (main): Reformat code (which handles n variable).

Eliminate 'value of NEED_FIXUP_POINTER unknown' cppcheck info messages

* include/private/gc_pmark.h: Replace #if NEED_FIXUP_POINTER
to #ifdef NEED_FIXUP_POINTER.
* include/private/gcconfig.h (NEED_FIXUP_POINTER): If FIXUP_POINTER
then define to empty else leave undefined.
* mark.c (GC_push_all_stack): Replace if(!NEED_FIXUP_POINTER)
to #ifndef NEED_FIXUP_POINTER.
* mark_rts.c (GC_push_all_stack_partially_eager): Likewise.

Fix 'ISO C90 forbids mixed declarations and code' compiler warning

* pthread_support.c [GC_PTHREADS && !GC_WIN32_THREADS]
(GC_thread_exit_proc): Move GC_log_printf() call down to be after local
variables declarations.
* thread_local_alloc.c [THREAD_LOCAL_ALLOC && USE_PTHREAD_SPECIFIC
&& !USE_WIN32_SPECIFIC]: Add {} to have "k" local variable declaration
before any statement in a block.

Eliminate 'ISO C forbids an empty translation unit' GCC pedantic warning

"extern int GC_quiet" is added to suppress compiler warning.

* extra/msvc_dbg.c [_M_AMD64 || !_MSC_VER] (GC_quiet): Declare external
variable.

Eliminate 'printf format specifies type void*' GCC pedantic warnings

Explicitly cast pointer arguments (passed to printf and ABORT_ARGn) to
void* to match %p format specifier.

* allchblk.c [!NO_DEBUGGING] (GC_dump_regions): Cast arguments to
void* those printf format specifier is %p.
* alloc.c [!NO_DEBUGGING] (GC_print_heap_sects): Likewise.
* backgraph.c [MAKE_BACK_GRAPH] (backwards_height): Likewise.
* blacklst.c (GC_default_print_heap_obj_proc): Likewise.
* blacklst.c [PRINT_BLACK_LIST] (GC_print_blacklisted_ptr): Likewise.
* cord/cordbscs.c (CORD_dump_inner): Likewise.
* darwin_stop_world.c [DEBUG_THREADS_EXTRA] (GC_FindTopOfStack):
Likewise.
* darwin_stop_world.c [DEBUG_THREADS] (GC_stack_range_for): Likewise.
* dbg_mlc.c (GC_print_obj): Likewise.
* dbg_mlc.c [!SHORT_DBG_HDRS] (GC_print_smashed_obj): Likewise.
* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Likewise.
* dyn_load.c [IRIX5] (GC_register_dynamic_libraries): Likewise.
* finalize.c [!NO_DEBUGGING] (GC_dump_finalization_links,
GC_dump_finalization): Likewise.
* include/private/gc_pmark.h [MARK_BIT_PER_GRANULE || MARK_BIT_PER_OBJ]
(PUSH_CONTENTS_HDR): Likewise.
* mark.c [ENABLE_TRACE] (GC_mark_from): Likewise.
* mark_rts.c [!NO_DEBUGGING] (GC_print_static_roots): Likewise.
* mark_rts.c [DEBUG_ADD_DEL_ROOTS] (GC_add_roots_inner,
GC_remove_root_at_pos): Likewise.
* misc.c [ENABLE_TRACE] (GC_init): Likewise.
* os_dep.c [LINUX || HURD] (GC_init_linux_data_start): Likewise.
* os_dep.c [!OS2 && !MSWIN32] (GC_register_data_segments): Likewise.
* os_dep.c [USE_MUNMAP && !USE_WINALLOC && !NACL] (GC_remap): Likewise.
* os_dep.c [!DARWIN && !MSWIN32 && !MSWINCE] (GC_write_fault_handler):
Likewise.
* os_dep.c [PROC_VDB && DEBUG_DIRTY_BITS] (GC_read_dirty): Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN && BROKEN_EXCEPTION_HANDLING]
(catch_exception_raise): Likewise.
* pthread_stop_world.c [DEBUG_THREADS] (GC_push_all_stacks): Likewise.
* pthread_support.c [DEBUG_THREADS] (GC_unregister_my_thread_inner,
GC_unregister_my_thread, GC_start_rtn_prepare_thread): Likewise.
* reclaim.c [!NO_DEBUGGING] (GC_print_free_list): Likewise.
* specific.c [USE_CUSTOM_SPECIFIC && GC_ASSERTIONS]
(GC_check_tsd_marks): Likewise.
* win32_threads.c [DEBUG_THREADS] (GC_push_stack_for): Likewise.
* win32_threads.c [GC_PTHREADS && DEBUG_THREADS] (GC_pthread_join,
GC_pthread_create, GC_pthread_start_inner, GC_thread_exit_proc):
Likewise.
* dbg_mlc.c: Remove duplicate check of SHORT_DBG_HDRS.
* include/private/gc_pmark.h [MARK_BIT_PER_GRANULE || MARK_BIT_PER_OBJ]
(PUSH_CONTENTS_HDR): Add missing parentheses around "source" argument
when casting it to ptr_t.

Eliminate 'scope of variable can be reduced' warning in write_fault_handler

* os_dep.c [!DARWIN] (GC_write_fault_handler): Move "i" local variable
declaration to the inner scope where the variable is actually used.

Fix local variable declarations in disclaim_bench

* tests/disclaim_bench.c (main): Place (move) tI, tF local variable
declarations (in the block) before any statement.

Fix 'variable unused' compiler warning in FirstDLOpenedLinkMap

* dyn_load.c [!USE_PROC_FOR_LIBRARIES] (GC_FirstDLOpenedLinkMap):
Declare dp local variable only if !NETBSD or !RTLD_DI_LINKMAP.

Workaround 'variable reassigned before old value used' cppcheck warnings

* misc.c (GC_call_with_gc_active): Call GC_noop1 for
GC_traced_stack_sect and GC_blocked_sp (before restoring their original
values) if CPPCHECK.
* win32_threads.c (GC_do_blocking_inner): Call GC_noop1 for
thread_blocked_sp field (before restoring its original value)
if CPPCHECK.
* win32_threads.c (GC_call_with_gc_active): Call GC_noop1 for
traced_stack_sect field (before restoring its original value)
if CPPCHECK.

Workaround 'same expression on both sides of ==' cppcheck style warning

* misc.c (GC_init): Do not check sizeof(signed_word) value if CPPCHECK.

Workaround 'same expression on both sides of OR' cppcheck style warning

* os_dep.c [USE_WINALLOC || CYGWIN32] (GC_mem_top_down): Define to
non-zero value (MEM_TOP_DOWN) if CPPCHECK.

Workaround 'variable hides enumerator with same name' cppcheck warnings

* include/new_gc_alloc.h (GC_bytes_per_word, GC_word_alignment): Define
as const unsigned (instead of single-item enum) if CPPCHECK.

Workaround 'redundant assignment of *result to itself' cppcheck warning

* os_dep.c [DGUX || LINUX && SPARC] (GC_SysVGetDataStart): Call
GC_noop1(&v) if CPPCHECK where v = *result.

Workaround 'obsolete function alloca() called' cppcheck warnings

* dyn_load.c [AIX] (GC_register_dynamic_libraries): Code refactoring
to have alloca() call only once (at the beginning of a block); use
variable-length array instead of alloca() if CPPCHECK.

Workaround 'possible null pointer dereference' cppcheck warnings

* include/private/gc_priv.h (GC_on_abort): Move definition upper (to be
before ABORT definition); define it to empty if PCR (this is needed for
CPPCHECK).
* include/private/gc_priv.h (ABORT): Specially define to
{GC_on_abort(msg);abort();} block statement if CPPCHECK.
* tests/test.c (chktree): Check for n is zero only once; add comment.

Workaround 'Condition 0!=GETENV() is always false' cppcheck style warnings

* include/private/gc_priv.h [NO_GETENV] (GETENV): Do not define to NULL
if CPPCHECK.

Eliminate 'constructor with 1 argument is not explicit' warnings in test_cpp
(fix commit 569fd66)

* tests/test_cpp.cc (GC_ATTR_EXPLICIT): Define macro in the same way as
in include/gc_allocator.h.

Workaround 'Uninitialized variable' cppcheck errors

* extra/AmigaOS.c [GC_AMIGA_DS] (GC_register_data_segments): Initialize
myseglist outside conditional statement.
* mach_dep.c [GETCONTEXT_FPU_EXCMASK_BUG && X86_64]
(GC_with_callee_saves_pushed): Call GC_noop1(&old_fcw) (before asm
fstcw) if CPPCHECK.
* mach_dep.c [!HAVE_BUILTIN_UNWIND_INIT] (GC_with_callee_saves_pushed):
Replace regs with &regs.
* os_dep.c [!MSWIN32 && !GC_OPENBSD_THREADS && ...]
(GC_get_main_stack_base): Set result to NULL if CPPCHECK but none of
HEURISTIC* and *STACKBOTTOM defined.

Workaround 'passing untyped NULL to variadic function' cppcheck warning

The portability warning "Passing NULL after the last typed argument to
a variadic function leads to undefined behavior" was reported for
ABORT_ARG2(..., DATASTART, DATAEND) call in GC_register_data_segments.

* include/private/gcconfig.h [SYMBIAN || __EMSCRIPTEN__] (DATASTART,
DATAEND): Explicitly cast NULL to ptr_t.

Workaround 'struct member is never used' cppcheck style warnings

* os_dep.c [OS2] (GC_register_data_segments): Assign 0 to
hdrdos.padding, hdr386.exe_format_level/os/padding1/padding2,
seg.pagemap/mapsize/reserved fields if CPPCHECK; add comment.
* os_dep.c [MPROTECT_VDB && DARWIN] (GC_mprotect_thread): Assign 0 to
the first element of reply.data, msg.data fields if CPPCHECK; add
comment.
* typd_mlc.c (TAG): Define to ad.ad_tag (instead of ld.ld_tag).

Fix 'variable assigned a value that is never used' cppcheck style warnings

* dyn_load.c [USE_PROC_FOR_LIBRARIES] (GC_register_map_entries): Remove
datastart local variable.
* extra/AmigaOS.c [GC_AMIGA_DS] (GC_register_data_segments): Remove
num local variable.
* extra/MacOS.c (firstTime): Remove.
* extra/MacOS.c (GC_MacTemporaryNewPtr): Do not define firstTime if
SHARED_LIBRARY_BUILD.
* extra/MacOS.c (GC_MacFreeTemporaryMemory): Do not define (and update)
totalMemoryUsed if SHARED_LIBRARY_BUILD.
* extra/msvc_dbg.c (GetDescriptionFromAddress): Do not assign size
variable when its value no longer used.

Workaround 'checking if unsigned value is negative' cppcheck warning

* allchblk.c [GC_ASSERTIONS && !USE_MUNMAP] (GC_add_to_fl): Replace
(signed_word)GC_heapsize<0 with (GC_heapsize&SIGNB)!=0.

Workaround more 'void pointers in calculations' cppcheck warnings

* include/new_gc_alloc.h (single_client_gc_alloc_template::allocate,
single_client_gc_alloc_template::ptr_free_allocate,
single_client_gc_alloc_template::deallocate,
single_client_gc_alloc_template::ptr_free_deallocate,
single_client_traceable_alloc_template::allocate,
single_client_traceable_alloc_template::ptr_free_allocate,
single_client_traceable_alloc_template::deallocate,
single_client_traceable_alloc_template::ptr_free_deallocate): Replace
GC_Xobjfreelist_ptr+nwords with &GC_Xobjfreelist_ptr[nwords].
* reclaim.c (GC_start_reclaim): Replace fop++ with (*(word**)&fop)++.
* thread_local_alloc.c (return_freelists): Replace gfl+i with &gfl[i].

Workaround 'unused variable' cppcheck style warnings

* include/private/gc_locks.h [PCR && THREADS] (DCL_LOCK_STATE): Define
to empty if CPPCHECK.
* mach_dep.c [MACOS && __MWERKS__ && POWERPC] (getRegisters): Declare
as external of CPPCHECK (as cppcheck does not recognize "asm" in
function declaration).

Eliminate more 'scope of variable can be reduced' cppcheck style warnings

* allchblk.c [MARK_BIT_PER_GRANULE] (setup_header): Move local variable
declarations to the inner scope where the variables are actually used.
* alloc.c [!SMALL_CONFIG] (GC_try_to_collect_inner,
GC_finish_collection): Likewise.
* alloc.c (GC_stopped_mark): Likewise.
* backgraph.c [MAKE_BACK_GRAPH] (add_edge): Likewise.
* darwin_stop_world.c [GC_DARWIN_THREADS] (GC_push_all_stacks,
GC_stop_world, GC_thread_resume): Likewise.
* dyn_load.c [USE_PROC_FOR_LIBRARIES] (sort_heap_sects): Likewise.
* dyn_load.c [ALPHA && OSF1 || HPUX] (GC_register_dynamic_libraries):
Likewise.
* dyn_load.c [DARWIN] (GC_dyld_image_add, GC_dyld_image_remove):
Likewise.
* extra/AmigaOS.c (GC_amiga_free_all_mem, GC_amiga_allocwrapper_any):
Likewise.
* extra/msvc_dbg.c (GetDescriptionFromAddress): Likewise.
* gcj_mlc.c [GC_GCJ_SUPPORT] (GC_core_gcj_malloc,
GC_gcj_malloc_ignore_off_page): Likewise.
* include/new_gc_alloc.h (single_client_gc_alloc_template::deallocate,
single_client_gc_alloc_template::ptr_free_deallocate,
single_client_traceable_alloc_template::deallocate,
single_client_traceable_alloc_template::ptr_free_deallocate): Likewise.
* malloc.c [THREADS] (GC_free_inner): Likewise.
* mark_rts.c (GC_add_roots_inner): Likewise.
* misc.c (GC_clear_stack): Likewise.
* os_dep.c [GWW_VDB] (GC_gww_read_dirty): Likewise.
* os_dep.c [MPROTECT_VDB] (GC_protect_heap): Likewise.
* os_dep.c [PROC_VDB] (GC_read_dirty): Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN] (catch_exception_raise): Likewise.
* pthread_stop_world.c [GC_NETBSD_THREADS_WORKAROUND] (GC_start_world):
Likewise.
* pthread_support.c [!GC_NO_PTHREAD_SIGMASK] (pthread_sigmask):
Likewise.
* reclaim.c [!SMALL_CONFIG] (GC_reclaim_all): Likewise.
* tests/test.c (run_one_test): Likewise.
* tests/test.c [MACOS] (SetMinimumStack): Likewise.
* thread_local_alloc.c [THREAD_LOCAL_ALLOC] (return_single_freelist):
Likewise.
* typd_mlc.c (GC_make_descriptor): Likewise.
* win32_threads.c (GC_start_world, GC_CreateThread): Likewise.
* win32_threads.c [!GC_PTHREADS_PARAMARK] (GC_start_mark_threads_inner):
Likewise.
* win32_threads.c [!MSWINCE && !CYGWIN32] (GC_beginthreadex): Likewise.

Eliminate 'printf format specifier mismatch' compiler warning (tools)

* tools/setjmp_t.c (main): Use %lu (instead of %ld) printf format
specifier for unsigned long value.

Fix typo in CHECK_GCLIB_VERSION name (test)

* tests/test.c (CHECK_GCLIB_VERSION): Fix typo in macro name.

Workaround 'resource leak' error reported by cppcheck (tools, test)

* tests/test.c [GC_GCJ_SUPPORT && TEST_WITH_SYSTEM_MALLOC] (reverse):
Call GC_noop1 for malloc() result.
* tools/if_not_there.c (main): Move "f" local variable assignments
outside conditional expression.

Eliminate 'unnecessary comparison of static strings' cppcheck warning

* tools/if_mach.c (main): Replace strcmp(x, "")!=0 with strlen(x)>0.

Workaround more '#error' cppcheck error messages

* darwin_stop_world.c (GC_stack_range_for): Skip #error pragma if
CPPCHECK.
* dyn_load.c [DYNAMIC_LOADING && !PCR && !DARWIN]: Likewise.
* dyn_load.c [SOLARISDL && !PCR && !GC_SOLARIS_THREADS && THREADS]:
Likewise.
* include/private/gc_priv.h [!POWERPC && !I386 && !X86_64 && !ARM32
&& !AARCH64] (GC_THREAD_STATE_T): Likewise.
* include/private/gcconfig.h [GC_IRIX_THREADS && !IRIX5 || ...]:
Likewise.
* include/private/gcconfig.h [PARALLEL_MARK && !THREADS]: Likewise.
* include/private/gcconfig.h [MARK_BIT_PER_GRANULE && MARK_BIT_PER_OBJ
|| ...]: Likewise.
* pcr_interface.c [PCR] (GC_enumerate_block): Likewise.
* win32_threads.c [!I386 && !X86_64 && !ARM32 && !SHx && !MIPS && !PPC
&& !ALPHA] (GC_push_stack_for): Likewise.
* darwin_stop_world.c (GC_stack_range_for): Initialize "lo" local
variable even if platform unsupported.

Fix 'syntax error' reported by cppcheck for mach_dep

The error is reported at line containing "asm".

* mach_dep.c [MACOS && M68K && THINK_C] (GC_push_regs): Do not define
if CPPCHECK.

Fix missing #error pragma

* dyn_load.c [DYNAMIC_LOADING && !PCR && !DARWIN]: Replace "-->" with
* dyn_load.c [SOLARISDL && !PCR && !GC_SOLARIS_THREADS && THREADS]:
Likewise.
* include/private/gc_hdrs [CPP_WORDSZ!=32 && CPP_WORDSZ<36]: Likewise.
* include/private/gc_priv.h [!HBLKSIZE]: Likewise.
* pthread_stop_world.c [!NSIG]: Likewise.

Workaround '#error' cppcheck error messages

* extra/msvc_dbg.c (GetStackFramesFromContext): Skip #error pragma
if CPPCHECK.
* include/private/gcconfig.h [sun && mc68000]: Likewise.
* include/private/gcconfig.h [hp9000s300 || ibm032 || _AUX_SOURCE
|| __pj__]: Likewise.
* include/private/gcconfig.h [!mach_type_known]: Likewise.
* include/private/gcconfig.h [HEXAGON && LINUX && !__ELF__]: Likewise.
* include/private/gcconfig.h [!ALIGNMENT || !STACKBOTTOM]: Likewise.
* os_dep.c [USE_MUNMAP && !USE_MMAP]: Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN && !ARM32 && !AARCH64 && !POWERPC
&& !I386]: Likewise.

Eliminate 'scope of variable can be reduced' cppcheck warning in allchblk

* allchblk.c [USE_MUNMAP] (GC_merge_unmapped): Move local variable
declarations to the inner scope where the variables are actually used.

Eliminate 'address of local variable returned' static analyzer warning

* mark_rts.c [__GNUC__ >= 4] (GC_approx_sp): Use
__builtin_frame_address(0) instead of &sp (but still write the value to
the volatile local variable to force stack to grow if necessary).
* tools/setjmp_t.c [__GNUC__ >= 4] (nested_sp): Return
__builtin_frame_address(0) instead of sp.

Fix tools/setjmp_t to prevent nested_sp inlining

Inlined nested_sp might cause incorrect result of nested_sp()<sp.

* tools/setjmp_t.c (nested_sp): Change return from int* to word.
* tools/setjmp_t.c (nested_sp_fn): New global volatile variable
initialized to nested_sp.
* tools/setjmp_t.c (main): Use nested_sp_fn instead of nested_sp;
remove redundant cast.

Eliminate more 'scope of variable can be reduced' cppcheck style warnings

* allchblk.c (GC_compute_large_free_bytes, GC_print_hblkfreelist,
free_list_index_of, GC_dump_regions, GC_add_to_fl, GC_unmap_old,
GC_allochblk_nth): Move local variable declaration to the inner scope
where the variable is actually used.
* alloc.c (GC_maybe_gc, GC_collect_a_little_inner, GC_set_fl_marks,
GC_clear_fl_marks): Likewise.
* dyn_load.c (GC_register_dynamic_libraries): Likewise.
* finalize.c (GC_ignore_self_finalize_mark_proc,
GC_register_finalizer_inner, GC_dump_finalization_links,
GC_dump_finalization, GC_make_disappearing_links_disappear,
GC_remove_dangling_disappearing_links, GC_invoke_finalizers): Likewise.
* headers.c (GC_install_counts): Likewise.
* malloc.c (GC_malloc_kind_global, GC_generic_malloc_uncollectable,
GC_free): Likewise.
* mark.c (GC_push_all_eager, GC_push_marked1, GC_push_marked2,
GC_push_marked4): Likewise.
* mark_rts.c (GC_next_exclusion, GC_exclude_static_roots_inner,
GC_push_conditional_with_exclusions): Likewise.
* misc.c (GC_base, GC_parse_mem_size_arg, GC_write): Likewise.
* os_dep.c (GC_repeat_read, GC_get_maps, GC_least_described_address,
GC_register_root_section, GC_register_data_segments): Likewise.
* reclaim.c (GC_reclaim_block, GC_start_reclaim): Likewise.
* finalize.c (ITERATE_DL_HASHTBL_BEGIN): Declare prev_dl local variable.

Eliminate 'potential overflow' static analyzer warning in test

* tests/subthread_create.c (entry): Replace (int)(int_v1 - uint_v2)
expression with int_v1 - (int)uint_v2.

Workaround 'mmap() resource handle leak' static analyzer warning

* os_dep.c [USE_MUNMAP && LINT2] (GC_unmap, GC_remap, GC_unmap_gap):
Call GC_noop1(result) where result is returned by mmap or VirtualAlloc.
* os_dep.c [USE_MUNMAP && NACL] (GC_remap): Rename mmap_result local
variable to result.
* os_dep.c [USE_MUNMAP && !USE_WINALLOC] (GC_unmap_gap): Update
GC_unmapped_bytes (by len) only if len is non-zero.

Workaround 'local variable size too big' static analyzer warning

* mark.c [PARALLEL_MARK] (LOCAL_MARK_STACK_SIZE): Define to smaller
value if LINT2 (to avoid static analysis tool warning that
local_mark_stack local variable size is very big).