Commit 5d182239 authored by Alexander Neundorf's avatar Alexander Neundorf

write_basic_package_version_file: add ExactVersion mode

This mode is for packages which consider themselves only compatible if
exactly the same version is requested. The tweak version is ignored.

Alex
parent 1c69cd8f
# 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 equal to the requested version.
# The tweak version component is ignored.
# The variable CVF_VERSION must be set before calling configure_file().
set(PACKAGE_VERSION "@CVF_VERSION@")
if("@CVF_VERSION@" MATCHES "^([0-9]+\\.[0-9]+\\.[0-9]+)\\..*") # strip the tweak version
set(CVF_VERSION_NO_TWEAK "${CMAKE_MATCH_1}")
else()
set(CVF_VERSION_NO_TWEAK "@CVF_VERSION@")
endif()
if("${PACKAGE_FIND_VERSION}" MATCHES "^([0-9]+\\.[0-9]+\\.[0-9]+)\\..*") # strip the tweak version
set(REQUESTED_VERSION_NO_TWEAK "${CMAKE_MATCH_1}")
else()
set(REQUESTED_VERSION_NO_TWEAK "${PACKAGE_FIND_VERSION}")
endif()
if("${REQUESTED_VERSION_NO_TWEAK}" STREQUAL "${CVF_VERSION_NO_TWEAK}")
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()
# check that the installed version has the same 32/64bit-ness as the one which is currently searching:
if(NOT "${CMAKE_SIZEOF_VOID_P}" STREQUAL "@CMAKE_SIZEOF_VOID_P@")
math(EXPR installedBits "@CMAKE_SIZEOF_VOID_P@ * 8")
set(PACKAGE_VERSION "${PACKAGE_VERSION} (${installedBits}bit)")
set(PACKAGE_VERSION_UNSUITABLE TRUE)
endif()
......@@ -61,7 +61,7 @@
# For an example see below the documentation for WRITE_BASIC_PACKAGE_VERSION_FILE().
#
#
# WRITE_BASIC_PACKAGE_VERSION_FILE( filename VERSION major.minor.patch COMPATIBILITY (AnyNewerVersion|SameMajorVersion) )
# WRITE_BASIC_PACKAGE_VERSION_FILE( filename VERSION major.minor.patch COMPATIBILITY (AnyNewerVersion|SameMajorVersion|ExactVersion) )
#
# Writes a file for use as <package>ConfigVersion.cmake file to <filename>.
# See the documentation of FIND_PACKAGE() for details on this.
......@@ -76,6 +76,10 @@
# not be considered compatible if 1.0 is requested.
# This mode should be used for packages which guarantee backward compatibility within the
# same major version.
# If ExactVersion is used, then the package is only considered compatible if the requested
# version matches exactly its own version number (not considering the tweak version).
# For example, version 1.2.3 of a package is only considered compatible to requested version 1.2.3.
# This mode is for packages without compatibility guarantees.
# If your project has more elaborated version matching rules, you will need to write your
# own custom ConfigVersion.cmake file instead of using this macro.
#
......
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