CMake/Modules/FindEXPAT.cmake

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
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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:
# FindEXPAT
# ---------
#
# Find the native Expat headers and library.
#
# Imported Targets
# ^^^^^^^^^^^^^^^^
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#
# This module defines the following :prop_tgt:`IMPORTED` targets:
#
# ``EXPAT::EXPAT``
# The Expat ``expat`` library, if found.
#
# Result Variables
# ^^^^^^^^^^^^^^^^
#
# This module will set the following variables in your project:
#
# ``EXPAT_INCLUDE_DIRS``
# where to find expat.h, etc.
# ``EXPAT_LIBRARIES``
# the libraries to link against to use Expat.
# ``EXPAT_FOUND``
# true if the Expat headers and libraries were found.
#
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find_package(PkgConfig QUIET)
pkg_check_modules(PC_EXPAT QUIET expat)
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# Look for the header file.
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find_path(EXPAT_INCLUDE_DIR NAMES expat.h HINTS ${PC_EXPAT_INCLUDE_DIRS})
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# Look for the library.
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find_library(EXPAT_LIBRARY NAMES expat libexpat HINTS ${PC_EXPAT_LIBRARY_DIRS})
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if (EXPAT_INCLUDE_DIR AND EXISTS "${EXPAT_INCLUDE_DIR}/expat.h")
file(STRINGS "${EXPAT_INCLUDE_DIR}/expat.h" expat_version_str
REGEX "^#[\t ]*define[\t ]+XML_(MAJOR|MINOR|MICRO)_VERSION[\t ]+[0-9]+$")
unset(EXPAT_VERSION_STRING)
foreach(VPART MAJOR MINOR MICRO)
foreach(VLINE ${expat_version_str})
if(VLINE MATCHES "^#[\t ]*define[\t ]+XML_${VPART}_VERSION[\t ]+([0-9]+)$")
set(EXPAT_VERSION_PART "${CMAKE_MATCH_1}")
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if(EXPAT_VERSION_STRING)
string(APPEND EXPAT_VERSION_STRING ".${EXPAT_VERSION_PART}")
else()
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set(EXPAT_VERSION_STRING "${EXPAT_VERSION_PART}")
endif()
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endif()
endforeach()
endforeach()
endif ()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(EXPAT
REQUIRED_VARS EXPAT_LIBRARY EXPAT_INCLUDE_DIR
VERSION_VAR EXPAT_VERSION_STRING)
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# Copy the results to the output variables and target.
if(EXPAT_FOUND)
set(EXPAT_LIBRARIES ${EXPAT_LIBRARY})
set(EXPAT_INCLUDE_DIRS ${EXPAT_INCLUDE_DIR})
if(NOT TARGET EXPAT::EXPAT)
add_library(EXPAT::EXPAT UNKNOWN IMPORTED)
set_target_properties(EXPAT::EXPAT PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${EXPAT_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${EXPAT_INCLUDE_DIRS}")
endif()
endif()
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mark_as_advanced(EXPAT_INCLUDE_DIR EXPAT_LIBRARY)