diff options
Diffstat (limited to 'src/third_party/wiredtiger/build_posix/configure.ac.in')
| -rw-r--r-- | src/third_party/wiredtiger/build_posix/configure.ac.in | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/build_posix/configure.ac.in b/src/third_party/wiredtiger/build_posix/configure.ac.in index 0cbf422de08..a18834185d0 100644 --- a/src/third_party/wiredtiger/build_posix/configure.ac.in +++ b/src/third_party/wiredtiger/build_posix/configure.ac.in @@ -102,6 +102,12 @@ if test "$GCC" = "yes"; then # instructions. if test "$wt_cv_arm64" = "yes"; then AM_CFLAGS="$AM_CFLAGS -march=armv8-a+crc" + # moutline-atomics preserves backwards compatibility with Arm v8.0 + # systems but also supports using Arm v8.1 atomics. The latter can + # massively improve performance on larger Arm systems. The flag was + # back ported to gcc8, 9 and is the default in gcc10+. See if the + # compiler supports the flag. + AX_CHECK_COMPILE_FLAG([-moutline-atomics], [AM_CFLAGS="$AM_CFLAGS -moutline-atomics"]) fi else # The Solaris native compiler gets the additional -mt flag. |