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