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-rw-r--r--configure.ac10
1 files changed, 10 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 36ceeef3..4476c8b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1104,6 +1104,14 @@ AC_MSG_CHECKING([if ARM64 CRC32 instruction is usable])
AS_IF([test "x$enable_arm64_crc32" = xno], [
AC_MSG_RESULT([no, --disable-arm64-crc32 was used])
], [
+ # Set -Werror here because some versions of Clang (14 and older)
+ # do not report the unsupported __attribute__((__target__("+crc")))
+ # or __crc32d() as an error, only as a warning. This does not need
+ # to be done with CMake because tests will attempt to link and the
+ # error will be reported then.
+ OLD_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -Werror"
+
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <arm_acle.h>
#include <stdint.h>
@@ -1124,6 +1132,8 @@ uint32_t my_crc(uint32_t a, uint64_t b)
enable_arm64_crc32=no
])
AC_MSG_RESULT([$enable_arm64_crc32])
+
+ CFLAGS="$OLD_CFLAGS"
])
# Check for ARM64 CRC32 instruction runtime detection.