432f2fd9ac
- use the same pattern across all Find modules:
- verify if the version header exists before reading it.
- use a single regex per lookup.
- sync regexes between Find modules.
- use generic temporary variable names.
- improve readability.
- make it simpler to transition to new CMake syntax in the future:
```cmake
file(STRINGS "${CARES_INCLUDE_DIR}/ares_version.h" _version_str REGEX "<...>")
unset(_version_str)
set(CARES_VERSION "${CMAKE_MATCH_1}")
```
Ref: https://cmake.org/cmake/help/latest/policy/CMP0159.html#policy:CMP0159
- fix zstd version detection to be CMake 3.7 compatible.
Required 3.9 before this patch, for the `CMAKE_MATCH_<n>` feature.
Follow-up to c5d506e9bb #12200
Follow-up to 4e2f3641f8 #14548
Closes #14572
86 lines
2.9 KiB
CMake
86 lines
2.9 KiB
CMake
#***************************************************************************
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# _ _ ____ _
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# Project ___| | | | _ \| |
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# / __| | | | |_) | |
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# | (__| |_| | _ <| |___
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# \___|\___/|_| \_\_____|
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#
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# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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#
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# This software is licensed as described in the file COPYING, which
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# you should have received as part of this distribution. The terms
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# are also available at https://curl.se/docs/copyright.html.
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#
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# You may opt to use, copy, modify, merge, publish, distribute and/or sell
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# copies of the Software, and permit persons to whom the Software is
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# furnished to do so, under the terms of the COPYING file.
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#
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# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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# KIND, either express or implied.
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#
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# SPDX-License-Identifier: curl
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#
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###########################################################################
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# Find the zstd library
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#
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# Result Variables:
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#
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# Zstd_FOUND System has zstd
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# Zstd_INCLUDE_DIRS The zstd include directories
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# Zstd_LIBRARIES The zstd library names
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# Zstd_VERSION Version of zstd
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if(CURL_USE_PKGCONFIG)
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find_package(PkgConfig QUIET)
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pkg_check_modules(PC_Zstd "libzstd")
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endif()
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find_path(Zstd_INCLUDE_DIR "zstd.h"
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HINTS
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${PC_Zstd_INCLUDEDIR}
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${PC_Zstd_INCLUDE_DIRS}
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)
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find_library(Zstd_LIBRARY NAMES "zstd"
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HINTS
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${PC_Zstd_LIBDIR}
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${PC_Zstd_LIBRARY_DIRS}
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)
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if(PC_Zstd_VERSION)
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set(Zstd_VERSION ${PC_Zstd_VERSION})
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elseif(Zstd_INCLUDE_DIR AND EXISTS "${Zstd_INCLUDE_DIR}/zstd.h")
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set(_version_regex1 "#[\t ]*define[ \t]+ZSTD_VERSION_MAJOR[ \t]+([0-9]+).*")
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set(_version_regex2 "#[\t ]*define[ \t]+ZSTD_VERSION_MINOR[ \t]+([0-9]+).*")
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set(_version_regex3 "#[\t ]*define[ \t]+ZSTD_VERSION_RELEASE[ \t]+([0-9]+).*")
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file(STRINGS "${Zstd_INCLUDE_DIR}/zstd.h" _version_str1 REGEX "${_version_regex1}")
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file(STRINGS "${Zstd_INCLUDE_DIR}/zstd.h" _version_str2 REGEX "${_version_regex2}")
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file(STRINGS "${Zstd_INCLUDE_DIR}/zstd.h" _version_str3 REGEX "${_version_regex3}")
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string(REGEX REPLACE "${_version_regex1}" "\\1" _version_str1 "${_version_str1}")
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string(REGEX REPLACE "${_version_regex2}" "\\1" _version_str2 "${_version_str2}")
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string(REGEX REPLACE "${_version_regex3}" "\\1" _version_str3 "${_version_str3}")
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set(Zstd_VERSION "${_version_str1}.${_version_str2}.${_version_str3}")
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unset(_version_regex1)
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unset(_version_regex2)
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unset(_version_regex3)
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unset(_version_str1)
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unset(_version_str2)
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unset(_version_str3)
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(Zstd
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REQUIRED_VARS
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Zstd_INCLUDE_DIR
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Zstd_LIBRARY
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VERSION_VAR
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Zstd_VERSION
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)
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if(Zstd_FOUND)
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set(Zstd_INCLUDE_DIRS ${Zstd_INCLUDE_DIR})
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set(Zstd_LIBRARIES ${Zstd_LIBRARY})
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endif()
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mark_as_advanced(Zstd_INCLUDE_DIR Zstd_LIBRARY)
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