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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).
#
# 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 configure_file() with the
# contents like the following::
#
# #cmakedefine01 Backtrace_FOUND
# #if Backtrace_FOUND
# # include <${Backtrace_HEADER}>
# #endif
#
# And then reference that generated header file in actual source.
include(CMakePushCheckState)
include(CheckSymbolExists)
include(FindPackageHandleStandardArgs)
# List of variables to be provided to find_package_handle_standard_args()
set(_Backtrace_STD_ARGS Backtrace_INCLUDE_DIR)
if(Backtrace_HEADER)
set(_Backtrace_HEADER_TRY "${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")
elseif() # 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)
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