I've tried to build stage3 with
-Wleading-whitespace=blanks -Wtrailing-whitespace=blank -Wno-error=leading-whitespace=blanks -Wno-error=trailing-whitespace=blank
added to STRICT_WARN and that expectably resulted in about
2744 unique trailing whitespace warnings and 124837 leading whitespace
warnings when excluding *.md files (which obviously is in big part a
generator issue).  Others from that are generator related, I think those
need to be solved later.

The following patch just fixes up the easy case (trailing whitespace),
which could be easily automated:
for i in `find . -name \*.h -o -name \*.cc -o -name \*.c | xargs grep -l '[ 	]$' | grep -v testsuite/`; do sed -i -e 's/[ 	]*$//' $i; done
I've excluded files which I knew are obviously generated or go FE.

Is there anything else we'd want to avoid the changes?

Due to patch size, I've split it between gcc/ part
and rest (include/, libiberty/, libgcc/, libcpp/, libstdc++-v3/;
this part).

2024-10-24  Jakub Jelinek  <jakub@redhat.com>

include/
	* dyn-string.h: Remove trailing whitespace.
	* libiberty.h: Likewise.
	* xregex.h: Likewise.
	* splay-tree.h: Likewise.
	* partition.h: Likewise.
	* plugin-api.h: Likewise.
	* demangle.h: Likewise.
	* vtv-change-permission.h: Likewise.
	* fibheap.h: Likewise.
	* hsa_ext_image.h: Likewise.
	* hashtab.h: Likewise.
	* libcollector.h: Likewise.
	* sort.h: Likewise.
	* symcat.h: Likewise.
	* hsa_ext_amd.h: Likewise.
libcpp/
	* directives.cc: Remove trailing whitespace.
	* mkdeps.cc: Likewise.
	* line-map.cc: Likewise.
	* internal.h: Likewise.
	* files.cc: Likewise.
	* init.cc: Likewise.
	* makeucnid.cc: Likewise.
	* system.h: Likewise.
	* include/line-map.h: Likewise.
	* include/symtab.h: Likewise.
	* include/cpplib.h: Likewise.
	* expr.cc: Likewise.
	* charset.cc: Likewise.
	* macro.cc: Likewise.
	* errors.cc: Likewise.
	* lex.cc: Likewise.
	* traditional.cc: Likewise.
libgcc/
	* crtstuff.c: Remove trailing whitespace.
	* libgcov.h: Likewise.
	* config/alpha/crtfastmath.c: Likewise.
	* config/alpha/vms-gcc_shell_handler.c: Likewise.
	* config/alpha/vms-unwind.h: Likewise.
	* config/pa/linux-atomic.c: Likewise.
	* config/pa/linux-unwind.h: Likewise.
	* config/pa/quadlib.c: Likewise.
	* config/pa/fptr.c: Likewise.
	* config/s390/32/_fixsfdi.c: Likewise.
	* config/s390/32/_fixunssfdi.c: Likewise.
	* config/s390/32/_fixunsdfdi.c: Likewise.
	* config/c6x/pr-support.c: Likewise.
	* config/lm32/_udivsi3.c: Likewise.
	* config/lm32/libgcc_lm32.h: Likewise.
	* config/lm32/_udivmodsi4.c: Likewise.
	* config/lm32/_mulsi3.c: Likewise.
	* config/lm32/_modsi3.c: Likewise.
	* config/lm32/_umodsi3.c: Likewise.
	* config/lm32/_divsi3.c: Likewise.
	* config/darwin-crt3.c: Likewise.
	* config/msp430/mpy.c: Likewise.
	* config/ia64/tf-signs.c: Likewise.
	* config/ia64/fde-vms.c: Likewise.
	* config/ia64/unwind-ia64.c: Likewise.
	* config/ia64/vms-unwind.h: Likewise.
	* config/ia64/sfp-exceptions.c: Likewise.
	* config/ia64/quadlib.c: Likewise.
	* config/ia64/unwind-ia64.h: Likewise.
	* config/rl78/vregs.h: Likewise.
	* config/arm/bpabi.c: Likewise.
	* config/arm/unwind-arm.c: Likewise.
	* config/arm/pr-support.c: Likewise.
	* config/arm/linux-atomic.c: Likewise.
	* config/arm/bpabi-lib.h: Likewise.
	* config/frv/frvend.c: Likewise.
	* config/frv/cmovw.c: Likewise.
	* config/frv/frvbegin.c: Likewise.
	* config/frv/cmovd.c: Likewise.
	* config/frv/cmovh.c: Likewise.
	* config/aarch64/cpuinfo.c: Likewise.
	* config/i386/crtfastmath.c: Likewise.
	* config/i386/cygming-crtend.c: Likewise.
	* config/i386/32/tf-signs.c: Likewise.
	* config/i386/crtprec.c: Likewise.
	* config/i386/sfp-exceptions.c: Likewise.
	* config/i386/w32-unwind.h: Likewise.
	* config/m32r/initfini.c: Likewise.
	* config/sparc/crtfastmath.c: Likewise.
	* config/gcn/amdgcn_veclib.h: Likewise.
	* config/nios2/linux-atomic.c: Likewise.
	* config/nios2/linux-unwind.h: Likewise.
	* config/nios2/lib2-mul.c: Likewise.
	* config/nios2/lib2-nios2.h: Likewise.
	* config/xtensa/unwind-dw2-xtensa.c: Likewise.
	* config/rs6000/darwin-fallback.c: Likewise.
	* config/rs6000/ibm-ldouble.c: Likewise.
	* config/rs6000/sfp-machine.h: Likewise.
	* config/rs6000/darwin-asm.h: Likewise.
	* config/rs6000/darwin-crt2.c: Likewise.
	* config/rs6000/aix-unwind.h: Likewise.
	* config/rs6000/sfp-exceptions.c: Likewise.
	* config/gthr-vxworks.c: Likewise.
	* config/riscv/atomic.c: Likewise.
	* config/visium/memcpy.c: Likewise.
	* config/darwin-crt-tm.c: Likewise.
	* config/stormy16/lib2funcs.c: Likewise.
	* config/arc/ieee-754/divtab-arc-sf.c: Likewise.
	* config/arc/ieee-754/divtab-arc-df.c: Likewise.
	* config/arc/initfini.c: Likewise.
	* config/sol2/gmon.c: Likewise.
	* config/microblaze/divsi3_table.c: Likewise.
	* config/m68k/fpgnulib.c: Likewise.
	* libgcov-driver.c: Likewise.
	* unwind-dw2.c: Likewise.
	* fp-bit.c: Likewise.
	* dfp-bit.h: Likewise.
	* dfp-bit.c: Likewise.
	* libgcov-driver-system.c: Likewise.
libgcc/config/libbid/
	* _le_td.c: Remove trailing whitespace.
	* bid128_compare.c: Likewise.
	* bid_div_macros.h: Likewise.
	* bid64_to_bid128.c: Likewise.
	* bid64_to_uint32.c: Likewise.
	* bid128_to_uint64.c: Likewise.
	* bid64_div.c: Likewise.
	* bid128_round_integral.c: Likewise.
	* bid_binarydecimal.c: Likewise.
	* bid128_string.c: Likewise.
	* bid_flag_operations.c: Likewise.
	* bid128_to_int64.c: Likewise.
	* _mul_sd.c: Likewise.
	* bid64_mul.c: Likewise.
	* bid128_noncomp.c: Likewise.
	* _gt_dd.c: Likewise.
	* bid64_add.c: Likewise.
	* bid64_string.c: Likewise.
	* bid_from_int.c: Likewise.
	* bid128.c: Likewise.
	* _ge_dd.c: Likewise.
	* _ne_sd.c: Likewise.
	* _dd_to_td.c: Likewise.
	* _unord_sd.c: Likewise.
	* bid64_to_uint64.c: Likewise.
	* _gt_sd.c: Likewise.
	* _sd_to_td.c: Likewise.
	* _addsub_td.c: Likewise.
	* _ne_td.c: Likewise.
	* bid_dpd.c: Likewise.
	* bid128_add.c: Likewise.
	* bid128_next.c: Likewise.
	* _lt_sd.c: Likewise.
	* bid64_next.c: Likewise.
	* bid128_mul.c: Likewise.
	* _lt_dd.c: Likewise.
	* _ge_td.c: Likewise.
	* _unord_dd.c: Likewise.
	* bid64_sqrt.c: Likewise.
	* bid_sqrt_macros.h: Likewise.
	* bid64_fma.c: Likewise.
	* _sd_to_dd.c: Likewise.
	* bid_conf.h: Likewise.
	* bid64_noncomp.c: Likewise.
	* bid_gcc_intrinsics.h: Likewise.
	* _gt_td.c: Likewise.
	* _ge_sd.c: Likewise.
	* bid128_minmax.c: Likewise.
	* bid128_quantize.c: Likewise.
	* bid32_to_bid64.c: Likewise.
	* bid_round.c: Likewise.
	* _td_to_sd.c: Likewise.
	* bid_inline_add.h: Likewise.
	* bid128_fma.c: Likewise.
	* _eq_td.c: Likewise.
	* bid32_to_bid128.c: Likewise.
	* bid64_rem.c: Likewise.
	* bid128_2_str_tables.c: Likewise.
	* _mul_dd.c: Likewise.
	* _dd_to_sd.c: Likewise.
	* bid128_div.c: Likewise.
	* _lt_td.c: Likewise.
	* bid64_compare.c: Likewise.
	* bid64_to_int32.c: Likewise.
	* _unord_td.c: Likewise.
	* bid128_rem.c: Likewise.
	* bid_internal.h: Likewise.
	* bid64_to_int64.c: Likewise.
	* _eq_dd.c: Likewise.
	* _td_to_dd.c: Likewise.
	* bid128_to_int32.c: Likewise.
	* bid128_to_uint32.c: Likewise.
	* _ne_dd.c: Likewise.
	* bid64_quantize.c: Likewise.
	* _le_dd.c: Likewise.
	* bid64_round_integral.c: Likewise.
	* _le_sd.c: Likewise.
	* bid64_minmax.c: Likewise.
libgcc/config/avr/libf7/
	* f7-renames.h: Remove trailing whitespace.
libstdc++-v3/
	* include/debug/debug.h: Remove trailing whitespace.
	* include/parallel/base.h: Likewise.
	* include/parallel/types.h: Likewise.
	* include/parallel/settings.h: Likewise.
	* include/parallel/multiseq_selection.h: Likewise.
	* include/parallel/partition.h: Likewise.
	* include/parallel/random_number.h: Likewise.
	* include/parallel/find_selectors.h: Likewise.
	* include/parallel/partial_sum.h: Likewise.
	* include/parallel/list_partition.h: Likewise.
	* include/parallel/search.h: Likewise.
	* include/parallel/algorithmfwd.h: Likewise.
	* include/parallel/random_shuffle.h: Likewise.
	* include/parallel/multiway_mergesort.h: Likewise.
	* include/parallel/sort.h: Likewise.
	* include/parallel/algobase.h: Likewise.
	* include/parallel/numericfwd.h: Likewise.
	* include/parallel/multiway_merge.h: Likewise.
	* include/parallel/losertree.h: Likewise.
	* include/bits/basic_ios.h: Likewise.
	* include/bits/stringfwd.h: Likewise.
	* include/bits/ostream_insert.h: Likewise.
	* include/bits/stl_heap.h: Likewise.
	* include/bits/unordered_map.h: Likewise.
	* include/bits/hashtable_policy.h: Likewise.
	* include/bits/stl_iterator_base_funcs.h: Likewise.
	* include/bits/valarray_before.h: Likewise.
	* include/bits/regex.h: Likewise.
	* include/bits/postypes.h: Likewise.
	* include/bits/stl_iterator.h: Likewise.
	* include/bits/localefwd.h: Likewise.
	* include/bits/stl_algo.h: Likewise.
	* include/bits/ios_base.h: Likewise.
	* include/bits/stl_function.h: Likewise.
	* include/bits/basic_string.h: Likewise.
	* include/bits/hashtable.h: Likewise.
	* include/bits/valarray_after.h: Likewise.
	* include/bits/char_traits.h: Likewise.
	* include/bits/gslice.h: Likewise.
	* include/bits/locale_facets_nonio.h: Likewise.
	* include/bits/mask_array.h: Likewise.
	* include/bits/specfun.h: Likewise.
	* include/bits/random.h: Likewise.
	* include/bits/slice_array.h: Likewise.
	* include/bits/valarray_array.h: Likewise.
	* include/tr1/float.h: Likewise.
	* include/tr1/functional_hash.h: Likewise.
	* include/tr1/math.h: Likewise.
	* include/tr1/hashtable_policy.h: Likewise.
	* include/tr1/stdio.h: Likewise.
	* include/tr1/complex.h: Likewise.
	* include/tr1/stdbool.h: Likewise.
	* include/tr1/stdarg.h: Likewise.
	* include/tr1/inttypes.h: Likewise.
	* include/tr1/fenv.h: Likewise.
	* include/tr1/stdlib.h: Likewise.
	* include/tr1/wchar.h: Likewise.
	* include/tr1/tgmath.h: Likewise.
	* include/tr1/limits.h: Likewise.
	* include/tr1/wctype.h: Likewise.
	* include/tr1/stdint.h: Likewise.
	* include/tr1/ctype.h: Likewise.
	* include/tr1/random.h: Likewise.
	* include/tr1/shared_ptr.h: Likewise.
	* include/ext/mt_allocator.h: Likewise.
	* include/ext/sso_string_base.h: Likewise.
	* include/ext/debug_allocator.h: Likewise.
	* include/ext/vstring_fwd.h: Likewise.
	* include/ext/pointer.h: Likewise.
	* include/ext/pod_char_traits.h: Likewise.
	* include/ext/malloc_allocator.h: Likewise.
	* include/ext/vstring.h: Likewise.
	* include/ext/bitmap_allocator.h: Likewise.
	* include/ext/pool_allocator.h: Likewise.
	* include/ext/type_traits.h: Likewise.
	* include/ext/ropeimpl.h: Likewise.
	* include/ext/codecvt_specializations.h: Likewise.
	* include/ext/throw_allocator.h: Likewise.
	* include/ext/extptr_allocator.h: Likewise.
	* include/ext/atomicity.h: Likewise.
	* include/ext/concurrence.h: Likewise.
	* include/c_compatibility/wchar.h: Likewise.
	* include/c_compatibility/stdint.h: Likewise.
	* include/backward/hash_fun.h: Likewise.
	* include/backward/binders.h: Likewise.
	* include/backward/hashtable.h: Likewise.
	* include/backward/auto_ptr.h: Likewise.
	* libsupc++/eh_arm.cc: Likewise.
	* libsupc++/unwind-cxx.h: Likewise.
	* libsupc++/si_class_type_info.cc: Likewise.
	* libsupc++/vec.cc: Likewise.
	* libsupc++/class_type_info.cc: Likewise.
	* libsupc++/vmi_class_type_info.cc: Likewise.
	* libsupc++/guard_error.cc: Likewise.
	* libsupc++/bad_typeid.cc: Likewise.
	* libsupc++/eh_personality.cc: Likewise.
	* libsupc++/atexit_arm.cc: Likewise.
	* libsupc++/pmem_type_info.cc: Likewise.
	* libsupc++/vterminate.cc: Likewise.
	* libsupc++/eh_terminate.cc: Likewise.
	* libsupc++/bad_cast.cc: Likewise.
	* libsupc++/exception_ptr.h: Likewise.
	* libsupc++/eh_throw.cc: Likewise.
	* libsupc++/bad_alloc.cc: Likewise.
	* libsupc++/nested_exception.cc: Likewise.
	* libsupc++/pointer_type_info.cc: Likewise.
	* libsupc++/pbase_type_info.cc: Likewise.
	* libsupc++/bad_array_new.cc: Likewise.
	* libsupc++/pure.cc: Likewise.
	* libsupc++/eh_exception.cc: Likewise.
	* libsupc++/bad_array_length.cc: Likewise.
	* libsupc++/cxxabi.h: Likewise.
	* libsupc++/guard.cc: Likewise.
	* libsupc++/eh_catch.cc: Likewise.
	* libsupc++/cxxabi_forced.h: Likewise.
	* libsupc++/tinfo.h: Likewise.

In r15-3714-gd3a7302ec5985a I added -Wsystem-headers to the libstdc++ build
flags to help catch problems in the library.  This patch takes a different
approach, of disabling the #pragma system_header unless _GLIBCXX_SYSHDR is
defined.  As a result, the testsuites will treat them as non-system-headers
to get better warning coverage during regression testing of both gcc and
libstdc++, not just when building the library.

My rationale for the #ifdef instead of just removing the #pragma is the
three G++ tests that want to test libstdc++ system header behavior, so we
need a way to select it.

This doesn't affect installed libraries, as they get their
system-header status from the lookup path.  But testsuite_flags
--build-includes gives -I directives rather than -isystem.

This patch doesn't change the headers in config/ because I'm not compiling
with most of them, so won't see any warnings that need fixing.  Adjusting
them could happen later, or we can not bother.

libstdc++-v3/ChangeLog:

	* acinclude.m4 (WARN_FLAGS): Remove -Wsystem-headers.
	* configure: Regenerate.
	* include/bits/algorithmfwd.h: #ifdef out #pragma GCC system_header.
	* include/bits/atomic_base.h
	* include/bits/atomic_futex.h
	* include/bits/atomic_timed_wait.h
	* include/bits/atomic_wait.h
	* include/bits/basic_ios.h
	* include/bits/basic_string.h
	* include/bits/boost_concept_check.h
	* include/bits/char_traits.h
	* include/bits/charconv.h
	* include/bits/chrono.h
	* include/bits/chrono_io.h
	* include/bits/codecvt.h
	* include/bits/concept_check.h
	* include/bits/cpp_type_traits.h
	* include/bits/elements_of.h
	* include/bits/enable_special_members.h
	* include/bits/erase_if.h
	* include/bits/forward_list.h
	* include/bits/functional_hash.h
	* include/bits/gslice.h
	* include/bits/gslice_array.h
	* include/bits/hashtable.h
	* include/bits/indirect_array.h
	* include/bits/invoke.h
	* include/bits/ios_base.h
	* include/bits/iterator_concepts.h
	* include/bits/locale_classes.h
	* include/bits/locale_facets.h
	* include/bits/locale_facets_nonio.h
	* include/bits/localefwd.h
	* include/bits/mask_array.h
	* include/bits/max_size_type.h
	* include/bits/memory_resource.h
	* include/bits/memoryfwd.h
	* include/bits/move_only_function.h
	* include/bits/node_handle.h
	* include/bits/ostream_insert.h
	* include/bits/out_ptr.h
	* include/bits/parse_numbers.h
	* include/bits/postypes.h
	* include/bits/quoted_string.h
	* include/bits/range_access.h
	* include/bits/ranges_base.h
	* include/bits/refwrap.h
	* include/bits/sat_arith.h
	* include/bits/semaphore_base.h
	* include/bits/slice_array.h
	* include/bits/std_abs.h
	* include/bits/std_function.h
	* include/bits/std_mutex.h
	* include/bits/std_thread.h
	* include/bits/stl_iterator_base_funcs.h
	* include/bits/stl_iterator_base_types.h
	* include/bits/stl_tree.h
	* include/bits/stream_iterator.h
	* include/bits/streambuf_iterator.h
	* include/bits/stringfwd.h
	* include/bits/this_thread_sleep.h
	* include/bits/unique_lock.h
	* include/bits/uses_allocator_args.h
	* include/bits/utility.h
	* include/bits/valarray_after.h
	* include/bits/valarray_array.h
	* include/bits/valarray_before.h
	* include/bits/version.h
	* include/c_compatibility/fenv.h
	* include/c_compatibility/inttypes.h
	* include/c_compatibility/stdint.h
	* include/decimal/decimal.h
	* include/experimental/bits/net.h
	* include/experimental/bits/shared_ptr.h
	* include/ext/aligned_buffer.h
	* include/ext/alloc_traits.h
	* include/ext/atomicity.h
	* include/ext/concurrence.h
	* include/ext/numeric_traits.h
	* include/ext/pod_char_traits.h
	* include/ext/pointer.h
	* include/ext/stdio_filebuf.h
	* include/ext/stdio_sync_filebuf.h
	* include/ext/string_conversions.h
	* include/ext/type_traits.h
	* include/ext/vstring.h
	* include/ext/vstring_fwd.h
	* include/ext/vstring_util.h
	* include/parallel/algorithmfwd.h
	* include/parallel/numericfwd.h
	* include/tr1/functional_hash.h
	* include/tr1/hashtable.h
	* include/tr1/random.h
	* libsupc++/exception.h
	* libsupc++/hash_bytes.h
	* include/bits/basic_ios.tcc
	* include/bits/basic_string.tcc
	* include/bits/fstream.tcc
	* include/bits/istream.tcc
	* include/bits/locale_classes.tcc
	* include/bits/locale_facets.tcc
	* include/bits/locale_facets_nonio.tcc
	* include/bits/ostream.tcc
	* include/bits/sstream.tcc
	* include/bits/streambuf.tcc
	* include/bits/string_view.tcc
	* include/bits/version.tpl
	* include/experimental/bits/string_view.tcc
	* include/ext/pb_ds/detail/resize_policy/hash_prime_size_policy_imp.hpp
	* include/ext/random.tcc
	* include/ext/vstring.tcc
	* include/tr2/bool_set.tcc
	* include/tr2/dynamic_bitset.tcc
	* include/bits/c++config
	* include/c/cassert
	* include/c/cctype
	* include/c/cerrno
	* include/c/cfloat
	* include/c/ciso646
	* include/c/climits
	* include/c/clocale
	* include/c/cmath
	* include/c/csetjmp
	* include/c/csignal
	* include/c/cstdarg
	* include/c/cstddef
	* include/c/cstdio
	* include/c/cstdlib
	* include/c/cstring
	* include/c/ctime
	* include/c/cuchar
	* include/c/cwchar
	* include/c/cwctype
	* include/c_global/cassert
	* include/c_global/ccomplex
	* include/c_global/cctype
	* include/c_global/cerrno
	* include/c_global/cfenv
	* include/c_global/cfloat
	* include/c_global/cinttypes
	* include/c_global/ciso646
	* include/c_global/climits
	* include/c_global/clocale
	* include/c_global/cmath
	* include/c_global/csetjmp
	* include/c_global/csignal
	* include/c_global/cstdalign
	* include/c_global/cstdarg
	* include/c_global/cstdbool
	* include/c_global/cstddef
	* include/c_global/cstdint
	* include/c_global/cstdio
	* include/c_global/cstdlib
	* include/c_global/cstring
	* include/c_global/ctgmath
	* include/c_global/ctime
	* include/c_global/cuchar
	* include/c_global/cwchar
	* include/c_global/cwctype
	* include/c_std/cassert
	* include/c_std/cctype
	* include/c_std/cerrno
	* include/c_std/cfloat
	* include/c_std/ciso646
	* include/c_std/climits
	* include/c_std/clocale
	* include/c_std/cmath
	* include/c_std/csetjmp
	* include/c_std/csignal
	* include/c_std/cstdarg
	* include/c_std/cstddef
	* include/c_std/cstdio
	* include/c_std/cstdlib
	* include/c_std/cstring
	* include/c_std/ctime
	* include/c_std/cuchar
	* include/c_std/cwchar
	* include/c_std/cwctype
	* include/debug/array
	* include/debug/bitset
	* include/debug/deque
	* include/debug/forward_list
	* include/debug/list
	* include/debug/map
	* include/debug/set
	* include/debug/string
	* include/debug/unordered_map
	* include/debug/unordered_set
	* include/debug/vector
	* include/decimal/decimal
	* include/experimental/algorithm
	* include/experimental/any
	* include/experimental/array
	* include/experimental/buffer
	* include/experimental/chrono
	* include/experimental/contract
	* include/experimental/deque
	* include/experimental/executor
	* include/experimental/filesystem
	* include/experimental/forward_list
	* include/experimental/functional
	* include/experimental/internet
	* include/experimental/io_context
	* include/experimental/iterator
	* include/experimental/list
	* include/experimental/map
	* include/experimental/memory
	* include/experimental/memory_resource
	* include/experimental/net
	* include/experimental/netfwd
	* include/experimental/numeric
	* include/experimental/propagate_const
	* include/experimental/ratio
	* include/experimental/regex
	* include/experimental/scope
	* include/experimental/set
	* include/experimental/socket
	* include/experimental/string
	* include/experimental/string_view
	* include/experimental/synchronized_value
	* include/experimental/system_error
	* include/experimental/timer
	* include/experimental/tuple
	* include/experimental/type_traits
	* include/experimental/unordered_map
	* include/experimental/unordered_set
	* include/experimental/vector
	* include/ext/algorithm
	* include/ext/cmath
	* include/ext/functional
	* include/ext/iterator
	* include/ext/memory
	* include/ext/numeric
	* include/ext/random
	* include/ext/rb_tree
	* include/ext/rope
	* include/parallel/algorithm
	* include/std/algorithm
	* include/std/any
	* include/std/array
	* include/std/atomic
	* include/std/barrier
	* include/std/bit
	* include/std/bitset
	* include/std/charconv
	* include/std/chrono
	* include/std/codecvt
	* include/std/complex
	* include/std/concepts
	* include/std/condition_variable
	* include/std/coroutine
	* include/std/deque
	* include/std/execution
	* include/std/expected
	* include/std/filesystem
	* include/std/format
	* include/std/forward_list
	* include/std/fstream
	* include/std/functional
	* include/std/future
	* include/std/generator
	* include/std/iomanip
	* include/std/ios
	* include/std/iosfwd
	* include/std/iostream
	* include/std/istream
	* include/std/iterator
	* include/std/latch
	* include/std/limits
	* include/std/list
	* include/std/locale
	* include/std/map
	* include/std/memory
	* include/std/memory_resource
	* include/std/mutex
	* include/std/numbers
	* include/std/numeric
	* include/std/optional
	* include/std/ostream
	* include/std/print
	* include/std/queue
	* include/std/random
	* include/std/ranges
	* include/std/ratio
	* include/std/regex
	* include/std/scoped_allocator
	* include/std/semaphore
	* include/std/set
	* include/std/shared_mutex
	* include/std/span
	* include/std/spanstream
	* include/std/sstream
	* include/std/stack
	* include/std/stacktrace
	* include/std/stdexcept
	* include/std/streambuf
	* include/std/string
	* include/std/string_view
	* include/std/syncstream
	* include/std/system_error
	* include/std/text_encoding
	* include/std/thread
	* include/std/tuple
	* include/std/type_traits
	* include/std/typeindex
	* include/std/unordered_map
	* include/std/unordered_set
	* include/std/utility
	* include/std/valarray
	* include/std/variant
	* include/std/vector
	* include/std/version
	* include/tr1/array
	* include/tr1/cfenv
	* include/tr1/cinttypes
	* include/tr1/cmath
	* include/tr1/complex
	* include/tr1/cstdbool
	* include/tr1/cstdint
	* include/tr1/cstdio
	* include/tr1/cstdlib
	* include/tr1/cwchar
	* include/tr1/cwctype
	* include/tr1/functional
	* include/tr1/memory
	* include/tr1/random
	* include/tr1/regex
	* include/tr1/tuple
	* include/tr1/type_traits
	* include/tr1/unordered_map
	* include/tr1/unordered_set
	* include/tr1/utility
	* include/tr2/bool_set
	* include/tr2/dynamic_bitset
	* include/tr2/type_traits
	* libsupc++/atomic_lockfree_defines.h
	* libsupc++/compare
	* libsupc++/cxxabi.h
	* libsupc++/cxxabi_forced.h
	* libsupc++/cxxabi_init_exception.h
	* libsupc++/exception
	* libsupc++/initializer_list
	* libsupc++/new
	* libsupc++/typeinfo: Likewise.
	* testsuite/20_util/ratio/operations/ops_overflow_neg.cc
	* testsuite/23_containers/array/tuple_interface/get_neg.cc
	* testsuite/23_containers/vector/cons/destructible_debug_neg.cc
	* testsuite/24_iterators/operations/prev_neg.cc
	* testsuite/ext/type_traits/add_unsigned_floating_neg.cc
	* testsuite/ext/type_traits/add_unsigned_integer_neg.cc
	* testsuite/ext/type_traits/remove_unsigned_floating_neg.cc
	* testsuite/ext/type_traits/remove_unsigned_integer_neg.cc: Adjust
	line numbers.

gcc/testsuite/ChangeLog

	* g++.dg/analyzer/fanalyzer-show-events-in-system-headers-default.C
	* g++.dg/analyzer/fanalyzer-show-events-in-system-headers-no.C
	* g++.dg/diagnostic/disable.C: #define _GLIBCXX_SYSHDR.

Including the header source code in the doxygen-generated PDF file makes
it too large, and causes pdflatex to run out of memory. If we only set
SOURCE_BROWSER=YES for the HTML docs then we won't include the sources
in the PDF file.

There are several macros defined for std::valarray that are only used to
generate repetitive code and then #undef'd. Those aren't useful in the
doxygen docs, especially the ones that reuse the same name in different
files. Omitting them avoids warnings about duplicate labels in the
refman.tex file.

libstdc++-v3/ChangeLog:

	* doc/doxygen/user.cfg.in (SOURCE_BROWSER): Only set to YES for
	HTML docs.
	* include/bits/gslice_array.h (_DEFINE_VALARRAY_OPERATOR): Omit
	from doxygen docs.
	* include/bits/indirect_array.h (_DEFINE_VALARRAY_OPERATOR):
	Likewise.
	* include/bits/mask_array.h (_DEFINE_VALARRAY_OPERATOR):
	Likewise.
	* include/bits/slice_array.h (_DEFINE_VALARRAY_OPERATOR):
	Likewise.
	* include/std/valarray (_DEFINE_VALARRAY_UNARY_OPERATOR)
	(_DEFINE_VALARRAY_AUGMENTED_ASSIGNMENT)
	(_DEFINE_VALARRAY_EXPR_AUGMENTED_ASSIGNMENT)
	(_DEFINE_BINARY_OPERATOR): Likewise.

A change in Doxygen 1.8.16 means that "// @}" is no longer recognized by
Doxygen, so doesn't close a @{ group. A "///" comment needs to be used.

libstdc++-v3/ChangeLog:

	* include/bits/atomic_base.h: Fix doxygen group close.
	* include/bits/basic_ios.h: Likewise.
	* include/bits/forward_list.h: Likewise.
	* include/bits/fs_dir.h: Likewise.
	* include/bits/fs_ops.h: Likewise.
	* include/bits/fs_path.h: Likewise.
	* include/bits/functional_hash.h: Likewise.
	* include/bits/gslice.h: Likewise.
	* include/bits/gslice_array.h: Likewise.
	* include/bits/hashtable_policy.h: Likewise.
	* include/bits/indirect_array.h: Likewise.
	* include/bits/locale_classes.h: Likewise.
	* include/bits/locale_facets.h: Likewise.
	* include/bits/locale_facets_nonio.h: Likewise.
	* include/bits/mask_array.h: Likewise.
	* include/bits/refwrap.h: Likewise.
	* include/bits/regex.h: Likewise.
	* include/bits/regex_automaton.h: Likewise.
	* include/bits/regex_compiler.h: Likewise.
	* include/bits/regex_constants.h: Likewise.
	* include/bits/regex_error.h: Likewise.
	* include/bits/regex_executor.h: Likewise.
	* include/bits/regex_scanner.h: Likewise.
	* include/bits/shared_ptr.h: Likewise.
	* include/bits/shared_ptr_atomic.h: Likewise.
	* include/bits/shared_ptr_base.h: Likewise.
	* include/bits/slice_array.h: Likewise.
	* include/bits/specfun.h: Likewise.
	* include/bits/std_function.h: Likewise.
	* include/bits/std_mutex.h: Likewise.
	* include/bits/stl_deque.h: Likewise.
	* include/bits/stl_iterator.h: Likewise.
	* include/bits/stl_iterator_base_types.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_numeric.h: Likewise.
	* include/bits/stl_pair.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/bits/stl_uninitialized.h: Likewise.
	* include/bits/stream_iterator.h: Likewise.
	* include/bits/streambuf_iterator.h: Likewise.
	* include/bits/unique_ptr.h: Likewise.
	* include/bits/unordered_map.h: Likewise.
	* include/bits/unordered_set.h: Likewise.
	* include/decimal/decimal: Likewise.
	* include/experimental/any: Likewise.
	* include/experimental/array: Likewise.
	* include/experimental/bits/fs_dir.h: Likewise.
	* include/experimental/bits/fs_fwd.h: Likewise.
	* include/experimental/bits/fs_ops.h: Likewise.
	* include/experimental/bits/fs_path.h: Likewise.
	* include/experimental/buffer: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/optional: Likewise.
	* include/experimental/propagate_const: Likewise.
	* include/experimental/socket: Likewise.
	* include/ext/pb_ds/assoc_container.hpp: Likewise.
	* include/ext/pb_ds/detail/priority_queue_base_dispatch.hpp:
	Likewise.
	* include/ext/pb_ds/detail/tree_policy/node_metadata_selector.hpp: Likewise.
	* include/ext/pb_ds/detail/trie_policy/node_metadata_selector.hpp: Likewise.
	* include/ext/pb_ds/detail/types_traits.hpp: Likewise.
	* include/ext/pb_ds/exception.hpp: Likewise.
	* include/ext/pb_ds/priority_queue.hpp: Likewise.
	* include/ext/pb_ds/tag_and_trait.hpp: Likewise.
	* include/ext/random: Likewise.
	* include/std/any: Likewise.
	* include/std/atomic: Likewise.
	* include/std/bitset: Likewise.
	* include/std/chrono: Likewise.
	* include/std/complex: Likewise.
	* include/std/condition_variable: Likewise.
	* include/std/fstream: Likewise.
	* include/std/future: Likewise.
	* include/std/iostream: Likewise.
	* include/std/istream: Likewise.
	* include/std/mutex: Likewise.
	* include/std/numeric: Likewise.
	* include/std/ostream: Likewise.
	* include/std/ratio: Likewise.
	* include/std/shared_mutex: Likewise.
	* include/std/stdexcept: Likewise.
	* include/std/streambuf: Likewise.
	* include/std/system_error: Likewise.
	* include/std/thread: Likewise.
	* include/std/valarray: Likewise.
	* include/std/variant: Likewise.
	* include/tr1/cmath: Likewise.
	* include/tr1/regex: Likewise.
	* include/tr2/dynamic_bitset: Likewise.
	* libsupc++/atomic_lockfree_defines.h: Likewise.
	* libsupc++/exception: Likewise.
	* libsupc++/exception.h: Likewise.
	* libsupc++/exception_ptr.h: Likewise.
	* libsupc++/nested_exception.h: Likewise.

libstdc++-v3/ChangeLog:

	* include/tr1/regex:

Some more C++20 changes from P1614R2, "The Mothership has Landed".

	* include/bits/slice_array.h (operator==(const slice&, const slice&)):
	Define for C++20.
	* include/std/complex (operator==(const T&, const complex<T>&))
	(operator!=(const complex<T>&, const complex<T>&))
	(operator!=(const complex<T>&, const T&))
	(operator!=(const T&, const complex<T>&)): Do not declare for C++20.
	* testsuite/26_numerics/slice/compare.cc: New test.