Add experimental FAST_BUILD option

Significantly reduces compile time for the FairMQ target with
precompiled headers and unity build. For maximum improvement, use
a multi-core-aware build tool, e.g. Ninja.

Leave it undocumented for now, let's first test it internally for a while.

CMakeLists.txt

@@ -34,10 +34,26 @@ cmake_dependent_option(BUILD_OFI_TRANSPORT "Build experimental OFI transport." O
 cmake_dependent_option(BUILD_DDS_PLUGIN "Build DDS plugin." OFF "BUILD_FAIRMQ" OFF)
 cmake_dependent_option(BUILD_EXAMPLES "Build FairMQ examples." ON "BUILD_FAIRMQ" OFF)
 option(BUILD_DOCS "Build FairMQ documentation." OFF)
+option(FAST_BUILD "Fast production build. Not recommended for development." OFF)
 ################################################################################
 
 
 # Dependencies #################################################################
+if(FAST_BUILD)
+  include(cotire)
+endif()
+
+macro(find_msgpack)
+  if(NOT msgpack_FOUND)
+    find_package2(PRIVATE msgpack VERSION 3.0.0)
+    set(PROJECT_msgpack_VERSION 2.1.5)
+    if(NOT msgpack_FOUND)
+      find_package2(PRIVATE msgpack VERSION 2.1.5 REQUIRED)
+    endif()
+    set(msgpack_ROOT ${PACKAGE_PREFIX_DIR})
+  endif()
+endmacro()
+
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 set(THREADS_PREFER_PTHREAD_FLAG TRUE)
 find_package(Threads REQUIRED)

COPYRIGHT

@@ -11,5 +11,31 @@ Comment: The copyright of individual contributors is documented in the
   Git history.
 License: LGPL-3.0-only
 
+Files: cmake/cotire.cmake
+Copyright: 2012-2018 Sascha Kratky
+License: COTIRE
+
 License: LGPL-3.0-only
   [see LICENSE file]
+
+License: COTIRE
+  Permission is hereby granted, free of charge, to any person
+  obtaining a copy of this software and associated documentation
+  files (the "Software"), to deal in the Software without
+  restriction, including without limitation the rights to use,
+  copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the
+  Software is furnished to do so, subject to the following
+  conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+  OTHER DEALINGS IN THE SOFTWARE.

fairmq/CMakeLists.txt

@@ -191,17 +191,25 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/options/startConfigExample.sh.in ${CM
 #################################
 # define libFairMQ build target #
 #################################
-add_library(FairMQ SHARED
+if(FAST_BUILD)
+  set(_target FairMQ_)
+else()
+  set(_target FairMQ)
+endif()
+add_library(${_target} SHARED
   ${FAIRMQ_SOURCE_FILES}
   ${FAIRMQ_PUBLIC_HEADER_FILES} # for IDE integration
   ${FAIRMQ_PRIVATE_HEADER_FILES} # for IDE integration
 )
-set_target_properties(FairMQ PROPERTIES LABELS coverage)
+set_target_properties(${_target} PROPERTIES LABELS coverage)
+if(FAST_BUILD)
+  set_target_properties(${_target} PROPERTIES OUTPUT_NAME FairMQ)
+endif()
 
 #######################
 # include directories #
 #######################
-target_include_directories(FairMQ
+target_include_directories(${_target}
     PUBLIC # consumers inherit public include directories
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}>
@@ -219,7 +227,10 @@ endif()
 if(BUILD_OFI_TRANSPORT)
   set(OFI_DEPS OFI::libfabric protobuf::libprotobuf $<TARGET_OBJECTS:OfiTransport>)
 endif()
-target_link_libraries(FairMQ
+set(optional_deps ${NANOMSG_DEPS} ${OFI_DEPS})
+list(REMOVE_DUPLICATES optional_deps)
+
+target_link_libraries(${_target}
     INTERFACE # only consumers link against interface dependencies
 
     PUBLIC # libFairMQ AND consumers of libFairMQ link aginst public dependencies
@@ -246,6 +257,20 @@ set_target_properties(FairMQ PROPERTIES
 )
 
 
+##############
+# fast build #
+##############
+if(FAST_BUILD)
+  set_target_properties(${_target} PROPERTIES
+    COTIRE_UNITY_TARGET_NAME "FairMQ"
+    # COTIRE_ENABLE_PRECOMPILED_HEADER FALSE
+    EXCLUDE_FROM_ALL TRUE
+  )
+  cotire(${_target})
+  set_target_properties(FairMQ PROPERTIES EXCLUDE_FROM_ALL FALSE)
+endif()
+
+
 ###############
 # executables #
 ###############