Support external builds of python bindings, gui, ctbgui and moench stuff (#440)

Use already installed version of the slsDetectorPackage. Assumes that the library has already been built and installed either on a system wide location or pointed to by CMAKE_PREFIX_PATH

CMakeLists.txt

@@ -8,13 +8,8 @@ set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
 
 cmake_policy(SET CMP0074 NEW)
 include(cmake/project_version.cmake)
-
-#functions to add compiler flags
 include(cmake/SlsAddFlag.cmake)
-
 include(cmake/SlsFindZeroMQ.cmake)
-
-# Include additional modules that are used unconditionally
 include(GNUInstallDirs)
 
 # If conda build, always set lib dir to 'lib'
@@ -28,7 +23,7 @@ string(TOLOWER "${PROJECT_NAME}" PROJECT_NAME_LOWER)
 
 # Set targets export name (used by slsDetectorPackage and dependencies)
 set(TARGETS_EXPORT_NAME "${PROJECT_NAME_LOWER}-targets")
-#set(namespace "${PROJECT_NAME}::")
+set(namespace "sls::")
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
 
@@ -39,6 +34,8 @@ if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
     set(SLS_MASTER_PROJECT ON)
 endif()
 
+
+
 option(SLS_USE_HDF5 "HDF5 File format" OFF)
 option(SLS_BUILD_SHARED_LIBRARIES "Build shared libaries" ON)
 option(SLS_USE_TEXTCLIENT "Text Client" ON)
@@ -71,6 +68,20 @@ if(SLS_BUILD_ONLY_MOENCH)
 endif()
 
 
+option(SLS_EXT_BUILD "external build of part of the project" OFF)
+if(SLS_EXT_BUILD)
+    message(STATUS "External build using already installed libraries")
+    set(SLS_BUILD_SHARED_LIBRARIES OFF CACHE BOOL "Should already exist" FORCE)
+    set(SLS_USE_TEXTCLIENT OFF CACHE BOOL "Should already exist" FORCE)
+    set(SLS_USE_DETECTOR OFF CACHE BOOL "Should already exist" FORCE)
+    set(SLS_USE_RECEIVER OFF CACHE BOOL "Should already exist" FORCE)
+    set(SLS_USE_RECEIVER_BINARIES OFF CACHE BOOL "Should already exist" FORCE)
+    set(SLS_MASTER_PROJECT OFF CACHE BOOL "No master proj in case of extbuild" FORCE) 
+endif()
+
+#Maybe have an option guarding this?
+set(SLS_INTERNAL_RAPIDJSON_DIR ${CMAKE_CURRENT_SOURCE_DIR}/libs/rapidjson)
+
 set(ClangFormat_EXCLUDE_PATTERNS    "build/" 
                                     "libs/" 
                                     "slsDetectorCalibration/" 
@@ -81,9 +92,6 @@ set(ClangFormat_EXCLUDE_PATTERNS    "build/"
                                     ${CMAKE_BINARY_DIR})
 find_package(ClangFormat)
 
-
-
-
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
@@ -102,62 +110,68 @@ else()
 endif()
 
 
-#Add two fake libraries to manage options
-add_library(slsProjectOptions INTERFACE)
-add_library(slsProjectWarnings INTERFACE)
-target_compile_features(slsProjectOptions INTERFACE cxx_std_11)
-target_compile_options(slsProjectWarnings INTERFACE 
-                                            -Wall
-                                            -Wextra
-                                            -Wno-unused-parameter
-                                            # -Wold-style-cast
-                                            -Wnon-virtual-dtor
-                                            -Woverloaded-virtual
-                                            -Wdouble-promotion
-                                            -Wformat=2
-                                            -Wredundant-decls
-                                            # -Wconversion
-                                            -Wvla
-                                            -Wdouble-promotion
-                                            -Werror=return-type
-                                 )
-
-#Settings for C code
-add_library(slsProjectCSettings INTERFACE)
-target_compile_options(slsProjectCSettings INTERFACE 
-                                            -std=gnu99 #fixed
-                                            -Wall
-                                            -Wextra
-                                            -Wno-unused-parameter
-                                            -Wdouble-promotion
-                                            -Wformat=2
-                                            -Wredundant-decls
-                                            -Wdouble-promotion
-                                            -Werror=return-type
-                                )
-
-
-#Testing for minimum version for compilers
-if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.2)
-        message(FATAL_ERROR "Clang version must be at least 3.2!")
-    endif()
-elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
-            message(FATAL_ERROR "GCC version must be at least 4.8!")
-    endif()
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5)
-            target_compile_options(slsProjectWarnings INTERFACE 
-                                             -Wno-missing-field-initializers)
-    endif()
+if(SLS_EXT_BUILD)
+    # Find ourself in case of external build
+    find_package(slsDetectorPackage ${PROJECT_VERSION} REQUIRED)
 endif()
 
-# Add or disable warnings depending on if the compiler supports them 
-# The function checks internally and sets HAS_warning-name
-sls_enable_cxx_warning("-Wnull-dereference")
-sls_enable_cxx_warning("-Wduplicated-cond")
-sls_disable_cxx_warning("-Wclass-memaccess")
-sls_disable_c_warning("-Wstringop-truncation")
+
+
+# slsProjectOptions and slsProjectWarnings are used
+# to control options for the libraries
+if(NOT TARGET slsProjectOptions)
+    add_library(slsProjectOptions INTERFACE)
+    target_compile_features(slsProjectOptions INTERFACE cxx_std_11)
+endif()
+
+if (NOT TARGET slsProjectWarnings)
+    add_library(slsProjectWarnings INTERFACE)
+    target_compile_options(slsProjectWarnings INTERFACE 
+        -Wall
+        -Wextra
+        -Wno-unused-parameter
+        # -Wold-style-cast
+        -Wnon-virtual-dtor
+        -Woverloaded-virtual
+        -Wdouble-promotion
+        -Wformat=2
+        -Wredundant-decls
+        # -Wconversion
+        -Wvla
+        -Wdouble-promotion
+        -Werror=return-type
+    )
+    # Add or disable warnings depending on if the compiler supports them 
+    # The function checks internally and sets HAS_warning-name
+    sls_enable_cxx_warning("-Wnull-dereference")
+    sls_enable_cxx_warning("-Wduplicated-cond")
+    sls_disable_cxx_warning("-Wclass-memaccess")
+
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5 AND "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+            target_compile_options(slsProjectWarnings INTERFACE 
+                                                -Wno-missing-field-initializers)
+endif()
+
+
+endif()
+
+
+if (NOT TARGET slsProjectCSettings)
+    #Settings for C code
+    add_library(slsProjectCSettings INTERFACE)
+    target_compile_options(slsProjectCSettings INTERFACE 
+                                                -std=gnu99 #fixed
+                                                -Wall
+                                                -Wextra
+                                                -Wno-unused-parameter
+                                                -Wdouble-promotion
+                                                -Wformat=2
+                                                -Wredundant-decls
+                                                -Wdouble-promotion
+                                                -Werror=return-type
+                                    )
+    sls_disable_c_warning("-Wstringop-truncation")
+endif()
 
 
 if(SLS_USE_SANITIZER)
@@ -172,19 +186,14 @@ if(SLS_TUNE_LOCAL)
 endif()
 
 
-#rapidjson
-add_library(rapidjson INTERFACE)
-target_include_directories(rapidjson INTERFACE
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/libs/rapidjson>  
-)
-
-# Install fake the libraries
-install(TARGETS slsProjectOptions slsProjectWarnings rapidjson
+if(SLS_MASTER_PROJECT)
+install(TARGETS slsProjectOptions slsProjectWarnings 
     EXPORT "${TARGETS_EXPORT_NAME}"
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
     PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
+endif()
 
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_INSTALL_RPATH $ORIGIN)
@@ -200,8 +209,9 @@ if (SLS_USE_TESTS)
 endif(SLS_USE_TESTS)
 
 
-# Common functionallity to detector and receiver
-add_subdirectory(slsSupportLib)
+if(NOT SLS_EXT_BUILD)
+    add_subdirectory(slsSupportLib)
+endif()
 
 if (SLS_USE_DETECTOR OR SLS_USE_TEXTCLIENT)
     add_subdirectory(slsDetectorSoftware)
@@ -225,7 +235,7 @@ endif (SLS_USE_INTEGRATION_TESTS)
 
 if (SLS_USE_PYTHON)
     find_package (Python 3.6 COMPONENTS Interpreter Development)
-    add_subdirectory(libs/pybind11)
+    add_subdirectory(libs/pybind11  ${CMAKE_BINARY_DIR}/bin/)
     add_subdirectory(python)
 endif(SLS_USE_PYTHON)