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Description: cmake: test for 16-byte atomic support on mips also
it's reported that a mips64el build host is able to pass the test of
CheckCxxAtomic without linking against libatomic, while librbd.so
fails to link due to failures like
.
/usr/bin/ld: ../../../lib/librbd.so.1.16.0: undefined reference to `__atomic_store_16'
/usr/bin/ld: ../../../lib/librbd.so.1.16.0: undefined reference to `__atomic_load_16'
/usr/bin/ld: ../../../lib/librbd.so.1.16.0: undefined reference to `__atomic_compare_exchange_16'
.
so we have to check the existence of __atomic_load_16 instruction on
mips architecture.
Author: Kefu Chai <tchaikov@gmail.com>
Date: Wed, 24 Nov 2021 00:40:54 +0800
Origin: upstream, https://github.com/ceph/ceph/commit/709a77f22010f03aee4a4c0ab930588944cb4a58
Last-Update: 2021-11-24
diff --git a/cmake/modules/CheckCxxAtomic.cmake b/cmake/modules/CheckCxxAtomic.cmake
index f2d89cf3e0beb..da2be5206d634 100644
--- a/cmake/modules/CheckCxxAtomic.cmake
+++ b/cmake/modules/CheckCxxAtomic.cmake
@@ -11,7 +11,7 @@ function(check_cxx_atomics var)
#include <atomic>
#include <cstdint>
-#if __s390x__
+#if defined(__s390x__) || (defined(__mips__) && _MIPS_SIM ==_ABI64 )
// Boost needs 16-byte atomics for tagged pointers.
// These are implemented via inline instructions on the platform
// if 16-byte alignment can be proven, and are delegated to libatomic
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