ARM64EC is a new ARM64 variant introduced in Windows 11 that uses an
ABI similar to AMD64, which allows for better interoperability with
emulated AMD64 applications. When enabled in MSVC, it defines _M_AMD64
and _M_ARM64EC, but not _M_ARM64, so we need to check for _M_ARM64EC.
The header locations are OS specific and not architecture specific. The
previous behaviour was to always include machine/endian.h for ARM and
AArch64 architectures on non-Windows and non-Linux OSs, causing build
failures if the OS uses other locations defined further down the
conditional block.
* Merge aarch64 and arm cmake sections.
* Updated MSVC compiler support for ARM and ARM64.
* Moved detection for -mfpu=neon to where the flag is set to simplify add_intrinsics_option.
* Only add ${ACLEFLAG} on aarch64 if not WITH_NEON.
* Rename arch/x86/ctzl.h to fallback_builtins.h.
