From f2747d1602ec4e1128356b861b2167daf66a845b Mon Sep 17 00:00:00 2001 From: "W. J. van der Laan" Date: Mon, 20 Sep 2021 12:19:38 +0200 Subject: [PATCH] build: Restrict check for CRC32C intrinsic to aarch64 `crc32c`'s hardware accelerated code doesn't handle ARM 32-bit at all. Make the check in `configure.ac` check for this architecture explicitly. For the release binaries, the current `configure.ac` check happens to work: it enables it on aarch64 but disables it for armhf. However some combination of compiler version and settings might ostensibly cause this check to succeed on armhf (as reported on IRC). So make the 64-bit platform requirement explicit. --- configure.ac | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 0dc480e6c1c..e30159f91bd 100644 --- a/configure.ac +++ b/configure.ac @@ -568,13 +568,17 @@ AX_CHECK_COMPILE_FLAG([-march=armv8-a+crc+crypto],[[ARM_CRC_CXXFLAGS="-march=arm TEMP_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS $ARM_CRC_CXXFLAGS" -AC_MSG_CHECKING(for ARM CRC32 intrinsics) +AC_MSG_CHECKING(for AArch64 CRC32 intrinsics) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include #include ]],[[ +#ifdef __aarch64__ __crc32cb(0, 0); __crc32ch(0, 0); __crc32cw(0, 0); __crc32cd(0, 0); vmull_p64(0, 0); +#else +#error "crc32c library does not support hardware acceleration on 32-bit ARM" +#endif ]])], [ AC_MSG_RESULT(yes); enable_arm_crc=yes; ], [ AC_MSG_RESULT(no)]