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venv/Lib/site-packages/cmake/data/share/cmake-3.18/Modules/FindBacktrace.cmake

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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+FindBacktrace
+-------------
+
+Find provider for `backtrace(3) <http://man7.org/linux/man-pages/man3/backtrace.3.html>`__.
+
+Checks if OS supports ``backtrace(3)`` via either ``libc`` or custom library.
+This module defines the following variables:
+
+``Backtrace_HEADER``
+  The header file needed for ``backtrace(3)``. Cached.
+  Could be forcibly set by user.
+``Backtrace_INCLUDE_DIRS``
+  The include directories needed to use ``backtrace(3)`` header.
+``Backtrace_LIBRARIES``
+  The libraries (linker flags) needed to use ``backtrace(3)``, if any.
+``Backtrace_FOUND``
+  Is set if and only if ``backtrace(3)`` support detected.
+
+The following cache variables are also available to set or use:
+
+``Backtrace_LIBRARY``
+  The external library providing backtrace, if any.
+``Backtrace_INCLUDE_DIR``
+  The directory holding the ``backtrace(3)`` header.
+
+Typical usage is to generate of header file using :command:`configure_file`
+with the contents like the following::
+
+ #cmakedefine01 Backtrace_FOUND
+ #if Backtrace_FOUND
+ # include <${Backtrace_HEADER}>
+ #endif
+
+And then reference that generated header file in actual source.
+#]=======================================================================]
+
+include(CMakePushCheckState)
+include(CheckSymbolExists)
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+
+# List of variables to be provided to find_package_handle_standard_args()
+set(_Backtrace_STD_ARGS Backtrace_INCLUDE_DIR)
+
+if(Backtrace_HEADER)
+  set(_Backtrace_HEADER_TRY "${Backtrace_HEADER}")
+else(Backtrace_HEADER)
+  set(_Backtrace_HEADER_TRY "execinfo.h")
+endif(Backtrace_HEADER)
+
+find_path(Backtrace_INCLUDE_DIR "${_Backtrace_HEADER_TRY}")
+set(Backtrace_INCLUDE_DIRS ${Backtrace_INCLUDE_DIR})
+
+if (NOT DEFINED Backtrace_LIBRARY)
+  # First, check if we already have backtrace(), e.g., in libc
+  cmake_push_check_state(RESET)
+  set(CMAKE_REQUIRED_INCLUDES ${Backtrace_INCLUDE_DIRS})
+  set(CMAKE_REQUIRED_QUIET ${Backtrace_FIND_QUIETLY})
+  check_symbol_exists("backtrace" "${_Backtrace_HEADER_TRY}" _Backtrace_SYM_FOUND)
+  cmake_pop_check_state()
+endif()
+
+if(_Backtrace_SYM_FOUND)
+  # Avoid repeating the message() call below each time CMake is run.
+  if(NOT Backtrace_FIND_QUIETLY AND NOT DEFINED Backtrace_LIBRARY)
+    message(STATUS "backtrace facility detected in default set of libraries")
+  endif()
+  set(Backtrace_LIBRARY "" CACHE FILEPATH "Library providing backtrace(3), empty for default set of libraries")
+else()
+  # Check for external library, for non-glibc systems
+  if(Backtrace_INCLUDE_DIR)
+    # OpenBSD has libbacktrace renamed to libexecinfo
+    find_library(Backtrace_LIBRARY "execinfo")
+  else()     # respect user wishes
+    set(_Backtrace_HEADER_TRY "backtrace.h")
+    find_path(Backtrace_INCLUDE_DIR ${_Backtrace_HEADER_TRY})
+    find_library(Backtrace_LIBRARY "backtrace")
+  endif()
+
+  # Prepend list with library path as it's more common practice
+  set(_Backtrace_STD_ARGS Backtrace_LIBRARY ${_Backtrace_STD_ARGS})
+endif()
+
+set(Backtrace_LIBRARIES ${Backtrace_LIBRARY})
+set(Backtrace_HEADER "${_Backtrace_HEADER_TRY}" CACHE STRING "Header providing backtrace(3) facility")
+
+find_package_handle_standard_args(Backtrace FOUND_VAR Backtrace_FOUND REQUIRED_VARS ${_Backtrace_STD_ARGS})
+mark_as_advanced(Backtrace_HEADER Backtrace_INCLUDE_DIR Backtrace_LIBRARY)