From e52642233648be4118835d388bc0f01cfc36d53a Mon Sep 17 00:00:00 2001 From: Thirumalai Nagalingam Date: Thu, 8 Jan 2026 12:32:22 +0530 Subject: [PATCH] Cygwin: Update _endian.h to handle unsupported arch Update _endian.h so that it explicitly throw an error when encountering an unsupported architecture instead of returning the unmodified x. Also tighten the arch detection logic by adding an explicit LE check. --- winsup/cygwin/include/machine/_endian.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/winsup/cygwin/include/machine/_endian.h b/winsup/cygwin/include/machine/_endian.h index 681ae4abe..e591f375d 100644 --- a/winsup/cygwin/include/machine/_endian.h +++ b/winsup/cygwin/include/machine/_endian.h @@ -28,8 +28,10 @@ __ntohl(__uint32_t _x) { #if defined(__x86_64__) __asm__("bswap %0" : "=r" (_x) : "0" (_x)); -#elif defined(__aarch64__) +#elif defined(__aarch64__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __asm__("rev %w0, %w0" : "=r" (_x) : "0" (_x)); +#else +#error "unsupported architecture" #endif return _x; } @@ -41,10 +43,12 @@ __ntohs(__uint16_t _x) __asm__("xchgb %b0,%h0" /* swap bytes */ : "=Q" (_x) : "0" (_x)); -#elif defined(__aarch64__) +#elif defined(__aarch64__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ __asm__("\n\ rev16 %0, %0 \n\ " : "=r" (_x) : "0" (_x)); +#else +#error "unsupported architecture" #endif return _x; } -- 2.52.0.windows.1