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Handle usr-move without forcing absolute paths (#14041)

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In commit 0c727b90 (install(EXPORT): Force absolute paths for usr-move,
2013-03-08) and commit d4774140 (configure_package_config_file: force
absolute paths for usr-move, 2013-01-24) we supported Linux
distributions implementing the "/usr move" by assuming that installation
to (/usr)?/lib(64)? represents a non-relocatable system package.

When cross-compiling one may prepare a package for installation into a
system location on a target machine but install the package files on the
*host* machine inside another path for use with CMAKE_FIND_ROOT_PATH.
In this case the package development files must still be relocatable.

Handle "/usr move" with a new approach that works with relocatable
files.  Teach configure_package_config_file and install(EXPORT) to
generate special logic in a package configuration file or targets file
for installation under (/usr)?/lib(64)?.  Teach the file to recognize
when it is loaded through a symlink that refers to the same realpath as
its original install destination.  In such a case, use the original
install prefix.  Otherwise, compute the prefix relative to the current
file location to make it relocatable.
This commit is contained in:
Brad King
2013-04-03 10:54:08 -04:00
parent 99f7cc127a
commit 6c613b433c
2 changed files with 45 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
Modules/CMakePackageConfigHelpers.cmake
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@@ -9,8 +9,6 @@
# configure_file() command when creating the <Name>Config.cmake or <Name>-config.cmake
# file for installing a project or library. It helps making the resulting package
# relocatable by avoiding hardcoded paths in the installed Config.cmake file.
# <Name>Config.cmake files installed under UNIX into /lib(64) or /usr/lib(64) are
# considered system packages and are not relocatable.
#
# In a FooConfig.cmake file there may be code like this to make the
# install destinations know to the using project:
@@ -176,32 +174,17 @@ function(CONFIGURE_PACKAGE_CONFIG_FILE _inputFile _outputFile)
set(absInstallDir "${CMAKE_INSTALL_PREFIX}/${CCF_INSTALL_DESTINATION}")
endif()
# with the /usr-move, /lib(64) is a symlink to /usr/lib on Fedora, ArchLinux, Mageira and others.
# If we are installed to such a location, force using absolute paths.
set(forceAbsolutePaths FALSE)
if("${absInstallDir}" MATCHES "^(/usr)?/lib(64)?/.+")
set(forceAbsolutePaths TRUE)
endif()
file(RELATIVE_PATH PACKAGE_RELATIVE_PATH "${absInstallDir}" "${CMAKE_INSTALL_PREFIX}" )
foreach(var ${CCF_PATH_VARS})
if(NOT DEFINED ${var})
message(FATAL_ERROR "Variable ${var} does not exist")
else()
if(forceAbsolutePaths)
if(IS_ABSOLUTE "${${var}}")
set(PACKAGE_${var} "${${var}}")
else()
set(PACKAGE_${var} "${CMAKE_INSTALL_PREFIX}/${${var}}")
endif()
if(IS_ABSOLUTE "${${var}}")
string(REPLACE "${CMAKE_INSTALL_PREFIX}" "\${PACKAGE_PREFIX_DIR}"
PACKAGE_${var} "${${var}}")
else()
if(IS_ABSOLUTE "${${var}}")
string(REPLACE "${CMAKE_INSTALL_PREFIX}" "\${PACKAGE_PREFIX_DIR}"
PACKAGE_${var} "${${var}}")
else()
set(PACKAGE_${var} "\${PACKAGE_PREFIX_DIR}/${${var}}")
endif()
set(PACKAGE_${var} "\${PACKAGE_PREFIX_DIR}/${${var}}")
endif()
endif()
endforeach()
@@ -216,6 +199,21 @@ function(CONFIGURE_PACKAGE_CONFIG_FILE _inputFile _outputFile)
get_filename_component(PACKAGE_PREFIX_DIR \"\${CMAKE_CURRENT_LIST_DIR}/${PACKAGE_RELATIVE_PATH}\" ABSOLUTE)
")
if("${absInstallDir}" MATCHES "^(/usr)?/lib(64)?/.+")
# Handle "/usr move" symlinks created by some Linux distros.
set(PACKAGE_INIT "${PACKAGE_INIT}
# Use original install prefix when loaded through a \"/usr move\"
# cross-prefix symbolic link such as /lib -> /usr/lib.
get_filename_component(_realCurr \"\${CMAKE_CURRENT_LIST_DIR}\" REALPATH)
get_filename_component(_realOrig \"${absInstallDir}\" REALPATH)
if(_realCurr STREQUAL _realOrig)
set(PACKAGE_PREFIX_DIR \"${CMAKE_INSTALL_PREFIX}\")
endif()
unset(_realOrig)
unset(_realCurr)
")
endif()
if(NOT CCF_NO_SET_AND_CHECK_MACRO)
set(PACKAGE_INIT "${PACKAGE_INIT}
macro(set_and_check _var _file)