Auto-sync with upstream branch master
    
    Upstream commit: 8d291eabd541029d7ac705cc1ea112c58dfbb05f
    
    - Apply asm redirection in gmp.h before first use
    - Rewrite find_cxx_header config configure.ac
    - elf/tlsdeschtab.h: Add the Malloc return value check in _dl_make_tlsdesc_dynamic()
    - elf: Disable some subtests of ifuncmain1, ifuncmain5 for !PIE
    - posix: Make posix_spawn extensions available by default
    - x86_64: Implement evex512 version of strrchr and wcsrchr
    - elf: Introduce <dl-call_tls_init_tp.h> and call_tls_init_tp (bug 29249)
    - LoongArch: Fix ABI related macros in elf.h to keep consistent with binutils[1].
    - scripts/glibcelf.py: Properly report <elf.h> parsing failures
    - elf: Rework exception handling in the dynamic loader [BZ #25486]
    - linux: Drop useless include from fstatat.c
    - Fix OOB read in stdlib thousand grouping parsing [BZ #29727]
    - linux: Fix fstatat on MIPSn64 (BZ #29730)
    - elf: Remove allocate use on _dl_debug_printf
    - nptl: Fix pthread_create.c build with clang
    - allocate_once: Apply asm redirection before first use
    - alloc_buffer: Apply asm redirection before first use
    - configure: Use -Wno-ignored-attributes if compiler warns about multiple aliases
    - Disable use of -fsignaling-nans if compiler does not support it
    - intl: Fix clang -Wunused-but-set-variable on plural.c
    - Apply asm redirection in not-cancel before first use
    - malloc: Use uintptr_t for pointer alignment
    - Use uintptr_t in fts for pointer alignment
    - Fix build with GCC 13 _FloatN, _FloatNx built-in functions
    - elf: Build tst-relr-mod[34]a.so with $(LDFLAGS-rpath-ORIGIN)
    - x86-64: Improve evex512 version of strlen functions
    - Correctly determine libc.so 'OUTPUT_FORMAT' when cross-compiling.
    - Remove unused scratch_buffer_dupfree
    - Fix elf/tst-dlmopen-twice not to exhaust static TLS
    - Use uintptr_t in string/tester for pointer alignment
    - stdlib/strfrom: Add copysign to fix NAN issue on riscv (BZ #29501)
    - Fix resource/bug-ulimit1 test
    - Fix missing NUL terminator in stdio-common/scanf13 test
    - Fix off-by-one OOB read in elf/tst-tls20
    - elf: Fix alloca size in _dl_debug_vdprintf
    - malloc: Use uintptr_t in alloc_buffer
    - Fix invalid pointer dereference in wcpcpy_chk
    - Fix invalid pointer dereference in wcscpy_chk
    - aarch64: Fix the extension header write in getcontext and swapcontext
    - aarch64: Don't build wordcopy
    - scripts: Use bool in tunables initializer
    - longlong.h: update from GCC for LoongArch clz/ctz support