Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/seastar/cmake/FindStdAtomic.cmake b/src/seastar/cmake/FindStdAtomic.cmake
new file mode 100644
index 00000000..2d14c0b2
--- /dev/null
+++ b/src/seastar/cmake/FindStdAtomic.cmake
@@ -0,0 +1,51 @@
+#
+# This file is open source software, licensed to you under the terms
+# of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+# distributed with this work for additional information regarding copyright
+# ownership.  You may not use this file except in compliance with the License.
+#
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+#
+# Copyright (C) 2019 Scylladb, Ltd.
+#
+
+function (_stdatomic_can_link var)
+  include (CheckCXXSourceCompiles)
+  set (test_code "int main() {}")
+  set (CMAKE_REQUIRED_LIBRARIES -latomic)
+  check_cxx_source_compiles ("${test_code}" ${var})
+endfunction ()
+
+_stdatomic_can_link (StdAtomic_EXPLICIT_LINK)
+
+#
+# If linking against `-latomic` is successful, then do it unconditionally.
+#
+
+if (StdAtomic_EXPLICIT_LINK)
+  set (StdAtomic_LIBRARY_NAME atomic)
+  set (StdAtomic_LIBRARIES -l${StdAtomic_LIBRARY_NAME})
+  include (FindPackageHandleStandardArgs)
+
+  find_package_handle_standard_args (StdAtomic
+    REQUIRED_VARS StdAtomic_LIBRARIES)
+endif ()
+
+if (NOT (TARGET StdAtomic::atomic))
+  add_library (StdAtomic::atomic INTERFACE IMPORTED)
+
+  set_target_properties (StdAtomic::atomic
+    PROPERTIES
+      INTERFACE_LINK_LIBRARIES "${StdAtomic_LIBRARIES}")
+endif ()