exiv2/cmake/JoinPaths.cmake
Jan Tojnar 48f2c9dbba
cmake: Fix paths with absolute GNUInstallDirs
It is not generally true that `CMAKE_INSTALL_<dir>` variables are relative paths:

https://github.com/jtojnar/cmake-snips#concatenating-paths-when-building-pkg-config-files
https://github.com/jtojnar/cmake-snips#assuming-cmake_install_dir-is-relative-path

Let's join them properly as paths, not strings.

On Windows, the absolute paths will likely remain unsupported as neither the CMake function,
nor the C++ code is able to detect absolute paths.

Signed-off-by: Jan Tojnar <jtojnar@gmail.com>
2020-09-05 11:18:46 +02:00

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# This module provides function for joining paths
# known from from most languages
#
# Original license:
# SPDX-License-Identifier: (MIT OR CC0-1.0)
# Copyright 2020 Jan Tojnar
# https://github.com/jtojnar/cmake-snips
#
# Modelled after Pythons os.path.join
# https://docs.python.org/3.7/library/os.path.html#os.path.join
# Windows not supported
function(join_paths joined_path first_path_segment)
set(temp_path "${first_path_segment}")
foreach(current_segment IN LISTS ARGN)
if(NOT ("${current_segment}" STREQUAL ""))
if(IS_ABSOLUTE "${current_segment}")
set(temp_path "${current_segment}")
else()
set(temp_path "${temp_path}/${current_segment}")
endif()
endif()
endforeach()
set(${joined_path} "${temp_path}" PARENT_SCOPE)
endfunction()