Add support for libunwind in CMake build

CMakeLists.txt

@@ -47,6 +47,7 @@ option(ENABLE_POSIX_CAP
 )
 option(ENABLE_PROFILER "Use gperftools profiler (default OFF)")
 option(ENABLE_TCMALLOC "Use TCMalloc (default OFF)")
+option(ENABLE_UNWIND "Use libunwind if found on system (default ON)" ON)
 set(TS_MAX_HOST_NAME_LEN 256 CACHE STRING "Max host name length (default 256)")
 set(TS_USE_SET_RBIO 1 CACHE STRING "Use openssl set_rbio (default 1)")
 set(TS_USE_DIAGS 1 CACHE STRING "Use diags (default 1)")
@@ -150,6 +151,14 @@ if(TSMallocReplacement_FOUND)
     link_libraries(ts::TSMallocReplacement)
 endif()
 
+if(ENABLE_UNWIND)
+    find_package(unwind)
+    if(unwind_FOUND)
+            link_libraries(unwind::unwind)
+    endif()
+    set(TS_USE_REMOTE_UNWINDING ${unwind_FOUND})
+endif()
+
 find_package(ZLIB REQUIRED)
 
 include(Check128BitCas)

cmake/Findunwind.cmake

@@ -0,0 +1,49 @@
+#######################
+#
+#  Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+#  agreements.  See the NOTICE file distributed with this work for additional information regarding
+#  copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
+#  (the "License"); 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.
+#
+#######################
+
+# Findunwind.cmake
+#
+# This will define the following variables
+#
+#     unwind_FOUND
+#     unwind_LIBRARY
+#     unwind_INCLUDE_DIRS
+#
+# and the following imported targets
+#
+#     unwind::unwind
+#
+
+find_library(unwind_LIBRARY NAMES unwind)
+find_path(unwind_INCLUDE_DIR NAMES unwind.h)
+
+mark_as_advanced(unwind_FOUND unwind_LIBRARY unwind_INCLUDE_DIR)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(unwind
+    REQUIRED_VARS unwind_LIBRARY unwind_INCLUDE_DIR
+)
+
+if(unwind_FOUND)
+    set(unwind_INCLUDE_DIRS ${unwind_INCLUDE_DIR})
+endif()
+
+if(unwind_FOUND AND NOT TARGET unwind::unwind)
+    add_library(unwind::unwind INTERFACE IMPORTED)
+    target_include_directories(unwind::unwind INTERFACE ${unwind_INCLUDE_DIRS})
+    target_link_libraries(unwind::unwind INTERFACE "${unwind_LIBRARY}")
+endif()

include/tscore/ink_config.h.cmake.in

@@ -125,6 +125,7 @@ const int DEFAULT_STACKSIZE = @DEFAULT_STACK_SIZE@;
 #cmakedefine01 TS_USE_LINUX_IO_URING
 #cmakedefine01 TS_USE_LINUX_NATIVE_AIO
 #cmakedefine01 TS_USE_POSIX_CAP
+#cmakedefine01 TS_USE_REMOTE_UNWINDING
 #cmakedefine01 TS_USE_SET_RBIO
 #cmakedefine01 TS_USE_TLS13