Fix Boost link flags in pkg-config file.

In newer versions of cmake, FindBoost uses Imported Targets for library
component variables, rather than file paths to the Boost libraries.

cmake uses these targets when linking (e.g. target_link_library) and
knows how to correctly substitute the values. However, the OSRM
pkg-config file that we generate doesn't do this, and ends up writing
the actual target symbols, hence the errors trying to link Boost::<component>.

To fix this for newer cmake versions, we create an intermediate configure step
that references the linker files for the imported targets. This is followed
by a generate step that performs the correct substitution.
See this thread for more details: https://cmake.org/pipermail/cmake/2018-December/068812.html

This is backwards compatible to the existing min cmake version (3.1).
However, building using cmake 3.1 fails with a package.json parsing error,
so this commit also bumps the min version to 3.2.

CHANGELOG.md

@@ -4,6 +4,7 @@
       - FIXED: Allow for special characters in the profile/method as part of the HTTP URL. [#6090](https://github.com/Project-OSRM/osrm-backend/pull/6090)
     - Build:
       - CHANGED: Replace Travis with Github Actions for CI builds [#6071](https://github.com/Project-OSRM/osrm-backend/pull/6071)
+      - FIXED: Fixed Boost link flags in pkg-config file. [#6083](https://github.com/Project-OSRM/osrm-backend/pull/6083)
     - Routing:
       - FIXED: Fix generation of inefficient MLD partitions [#6084](https://github.com/Project-OSRM/osrm-backend/pull/6084)
 

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.2)
 
 if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR AND NOT MSVC_IDE)
   message(FATAL_ERROR "In-source builds are not allowed.
@@ -802,9 +802,25 @@ set(PKGCONFIG_INCLUDE_DIR "${CMAKE_INSTALL_PREFIX}/include")
 list(APPEND DEPENDENCIES_INCLUDE_DIRS "${PKGCONFIG_INCLUDE_DIR}")
 list(APPEND DEPENDENCIES_INCLUDE_DIRS "${PKGCONFIG_INCLUDE_DIR}/osrm")
 JOIN("-I${DEPENDENCIES_INCLUDE_DIRS}" " -I" PKGCONFIG_OSRM_INCLUDE_FLAGS)
-JOIN("${ENGINE_LIBRARIES}" " " PKGCONFIG_OSRM_DEPENDENT_LIBRARIES)
 
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkgconfig.in libosrm.pc @ONLY)
+# Boost uses imported targets, we need to use a generator expression to extract
+# the link libraries to be written to the pkg-config file.
+foreach(engine_lib ${ENGINE_LIBRARIES})
+  if("${engine_lib}" MATCHES "^Boost.*")
+    list(APPEND PKGCONFIG_DEPENDENT_LIBRARIES "$<TARGET_LINKER_FILE:${engine_lib}>")
+  else()
+    list(APPEND PKGCONFIG_DEPENDENT_LIBRARIES "${engine_lib}")
+  endif()
+endforeach(engine_lib)
+JOIN("${PKGCONFIG_DEPENDENT_LIBRARIES}" " " PKGCONFIG_OSRM_DEPENDENT_LIBRARIES)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkgconfig.in pkgconfig.configured @ONLY)
+file(GENERATE
+     OUTPUT
+     ${PROJECT_BINARY_DIR}/libosrm.pc
+     INPUT
+     ${PROJECT_BINARY_DIR}/pkgconfig.configured)
+
 install(FILES ${PROJECT_BINARY_DIR}/libosrm.pc DESTINATION ${PKGCONFIG_LIBRARY_DIR}/pkgconfig)
 
 # uninstall target