我希望我的回购依赖于具有特定允许版本范围的包。因此，查看文档，我写道：
find_package(mypkg 0.3.3...<0.5.0 REQUIRED)
但是当我使用CMake(v3.23.0-rc2(进行配置时，这一行会产生：
CMake Error at CMakeLists.txt:24 (find_package):
Could not find a configuration file for package "mypkg" that is
compatible with requested version range "0.3.3...<0.5.0".
The following configuration files were considered but not accepted:
/opt/mypkg/lib64/cmake/mypkg/mypkg-config.cmake, version: 0.4.6
为什么0.4.6与0.3.3不兼容…<0.5.0？或者——还有什么不对劲吗？
附加信息：
使用回购的
CMakeLists.txt具有：cmake_minimum_required(VERSION 3.18 FATAL_ERROR)将其更改为3.19也无济于事。
根据流行的请求，以下是包的自动生成版本配置文件：
# This is a basic version file for the Config-mode of find_package().
# It is used by write_basic_package_version_file() as input file for configure_file()
# to create a version-file which can be installed along a config.cmake file.
#
# The created file sets PACKAGE_VERSION_EXACT if the current version string and
# the requested version string are exactly the same and it sets
# PACKAGE_VERSION_COMPATIBLE if the current version is >= requested version,
# but only if the requested major and minor versions are the same as the current
# one.
# The variable CVF_VERSION must be set before calling configure_file().
set(PACKAGE_VERSION "0.4.6")
if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
set(PACKAGE_VERSION_COMPATIBLE FALSE)
else()
if("0.4.6" MATCHES "^([0-9]+)\.([0-9]+)")
set(CVF_VERSION_MAJOR "${CMAKE_MATCH_1}")
set(CVF_VERSION_MINOR "${CMAKE_MATCH_2}")
if(NOT CVF_VERSION_MAJOR VERSION_EQUAL 0)
string(REGEX REPLACE "^0+" "" CVF_VERSION_MAJOR "${CVF_VERSION_MAJOR}")
endif()
if(NOT CVF_VERSION_MINOR VERSION_EQUAL 0)
string(REGEX REPLACE "^0+" "" CVF_VERSION_MINOR "${CVF_VERSION_MINOR}")
endif()
else()
set(CVF_VERSION_MAJOR "0.4.6")
set(CVF_VERSION_MINOR "")
endif()
if(PACKAGE_FIND_VERSION_RANGE)
# both endpoints of the range must have the expected major and minor versions
math (EXPR CVF_VERSION_MINOR_NEXT "${CVF_VERSION_MINOR} + 1")
if (NOT (PACKAGE_FIND_VERSION_MIN_MAJOR STREQUAL CVF_VERSION_MAJOR
AND PACKAGE_FIND_VERSION_MIN_MINOR STREQUAL CVF_VERSION_MINOR)
OR ((PACKAGE_FIND_VERSION_RANGE_MAX STREQUAL "INCLUDE"
AND NOT (PACKAGE_FIND_VERSION_MAX_MAJOR STREQUAL CVF_VERSION_MAJOR
AND PACKAGE_FIND_VERSION_MAX_MINOR STREQUAL CVF_VERSION_MINOR))
OR (PACKAGE_FIND_VERSION_RANGE_MAX STREQUAL "EXCLUDE"
AND NOT PACKAGE_FIND_VERSION_MAX VERSION_LESS_EQUAL ${CVF_VERSION_MAJOR}.${CVF_VERSION_MINOR_NEXT})))
set(PACKAGE_VERSION_COMPATIBLE FALSE)
elseif(PACKAGE_FIND_VERSION_MIN_MAJOR STREQUAL CVF_VERSION_MAJOR
AND PACKAGE_FIND_VERSION_MIN_MINOR STREQUAL CVF_VERSION_MINOR
AND ((PACKAGE_FIND_VERSION_RANGE_MAX STREQUAL "INCLUDE" AND PACKAGE_VERSION VERSION_LESS_EQUAL PACKAGE_FIND_VERSION_MAX)
OR (PACKAGE_FIND_VERSION_RANGE_MAX STREQUAL "EXCLUDE" AND PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION_MAX)))
set(PACKAGE_VERSION_COMPATIBLE TRUE)
else()
set(PACKAGE_VERSION_COMPATIBLE FALSE)
endif()
else()
if(NOT PACKAGE_FIND_VERSION_MAJOR VERSION_EQUAL 0)
string(REGEX REPLACE "^0+" "" PACKAGE_FIND_VERSION_MAJOR "${PACKAGE_FIND_VERSION_MAJOR}")
endif()
if(NOT PACKAGE_FIND_VERSION_MINOR VERSION_EQUAL 0)
string(REGEX REPLACE "^0+" "" PACKAGE_FIND_VERSION_MINOR "${PACKAGE_FIND_VERSION_MINOR}")
endif()
if((PACKAGE_FIND_VERSION_MAJOR STREQUAL CVF_VERSION_MAJOR) AND
(PACKAGE_FIND_VERSION_MINOR STREQUAL CVF_VERSION_MINOR))
set(PACKAGE_VERSION_COMPATIBLE TRUE)
else()
set(PACKAGE_VERSION_COMPATIBLE FALSE)
endif()
if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
set(PACKAGE_VERSION_EXACT TRUE)
endif()
endif()
endif()
# if the installed project requested no architecture check, don't perform the check
if("FALSE")
return()
endif()
# if the installed or the using project don't have CMAKE_SIZEOF_VOID_P set, ignore it:
if("${CMAKE_SIZEOF_VOID_P}" STREQUAL "" OR "8" STREQUAL "")
return()
endif()
# check that the installed version has the same 32/64bit-ness as the one which is currently searching:
if(NOT CMAKE_SIZEOF_VOID_P STREQUAL "8")
math(EXPR installedBits "8 * 8")
set(PACKAGE_VERSION "${PACKAGE_VERSION} (${installedBits}bit)")
set(PACKAGE_VERSION_UNSUITABLE TRUE)
endif()
简而言之：从为包指定的兼容性策略来看，版本范围0.3.3...<0.5.0不正确。只有当请求中的主要版本和次要版本与包的版本相同时，给定的包才会被视为兼容。
正确的版本请求可能是：
0.3.3...<0.4.00.4.3...<0.5.0
(但是版本为0.4.6的包将仅满足第二个请求(。
详细信息
配置文件由write_basic_package_version\ufile和COMPATIBILITY选项SameMinorVersion生成。这可以从描述中推断出来：
# ... it sets
# PACKAGE_VERSION_COMPATIBLE if the current version is >= requested version,
# but only if the requested major and minor versions are the same as the current
# one.
如果请求包含两端的版本范围(不包括<(，则两侧应具有相同的主版本和次版本：
# both endpoints of the range must have the expected major and minor versions
当排除上端(使用<(时，它的次要版本可能比下端大1。
允许：
3.3.0...3.3.53.4.2...3.4.103.3.0...<3.3.53.3.2...<3.4
不允许：
3.3.0...3.4.03.3.0...4.3.03.3.0...<3.53.3.0...<3.4.1
只有在允许版本范围时，才会检查包的版本是否在该范围内。在其他情况下，程序包被视为与请求不兼容。
根据我的理解，find_package调用中的版本请求语义是：
- 如果请求单个版本，则包版本应与请求的版本兼容。并且包版本应该不低于请求的版本
- 如果版本范围没有
<，则软件包的版本应与两端兼容。并且包版本应该属于该范围 - 在具有
<的版本范围的情况下下一个不兼容"；包的版本。在其他方面，这种情况类似于没有CCD_ 20的情况