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CMake: Fix $ORIGIN rpaths to work when passed on the command line

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The CMAKE_INSTALL_RPATH cache var had the PATH type, which made
CMake transform the value into an absolute path, getting rid of the
$ORIGIN value.

Fix that by changing the cache var type to STRING.

Also clean up the all-caps commands, add a usage example and print
the install RPATH.

Change-Id: Ibf40cfde4283369ddfcf52609143799cc8e47d68
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This commit is contained in:
Alexandru Croitor 2020-04-15 11:13:46 +02:00
parent 786b48878f
commit e835a6853b
1 changed files with 10 additions and 6 deletions
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16
cmake/QtBuild.cmake
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@ -101,18 +101,22 @@ if(NOT QT_MKSPECS_DIR)
endif()
# the default RPATH to be used when installing, but only if it's not a system directory
LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/${INSTALL_LIBDIR}" isSystemDir)
IF("${isSystemDir}" STREQUAL "-1")
SET(_default_install_rpath "${CMAKE_INSTALL_PREFIX}/${INSTALL_LIBDIR}")
ENDIF("${isSystemDir}" STREQUAL "-1")
list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/${INSTALL_LIBDIR}" isSystemDir)
if("${isSystemDir}" STREQUAL "-1")
set(_default_install_rpath "${CMAKE_INSTALL_PREFIX}/${INSTALL_LIBDIR}")
endif("${isSystemDir}" STREQUAL "-1")
# Default rpath settings: Use rpath for build tree as well as a full path for the installed binaries.
# For origin builds, one needs to override CMAKE_INSTALL_RPATH for example with $ORIGIN/../lib
SET(CMAKE_INSTALL_RPATH "${_default_install_rpath}" CACHE PATH "RPATH for installed binaries")
# Example: -DCMAKE_INSTALL_RPATH=\$ORIGIN/../lib (backslash to escape the $ in the shell)
# Implementation note: the cache var must be STRING and not PATH or FILEPATH, otherwise CMake will
# transform the value into an absolute path, getting rid of '$ORIGIN'.
set(CMAKE_INSTALL_RPATH "${_default_install_rpath}" CACHE STRING "RPATH for installed binaries")
message(STATUS "Install RPATH set to: ${CMAKE_INSTALL_RPATH}")
# add the automatically determined parts of the RPATH
# which point to directories outside the build tree to the install RPATH
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
# Generate a module description file based on the template in ModuleDescription.json.in
function(qt_describe_module target)