Feature precompiled header

CMakeLists.txt

@@ -3,9 +3,42 @@ set(CMAKE_CXX_STANDARD 17)
 project(nuTens)
 enable_testing()
 
+## check build times
+## have this optional as it's not supported on all CMake platforms
+OPTION(BUILD_TIMING "output time to build each target" OFF)
+IF(BUILD_TIMING)
+    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CMAKE_COMMAND} -E time")
+ENDIF()
+
 find_package(Torch REQUIRED)
 find_package(Protobuf REQUIRED)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${TORCH_CXX_FLAGS}")
 
+
+## if user wants to use pch then we use the pch
+## people, especially if developing, might want to use this as including tensor related things
+## can be excruciatingly sloow when building
+OPTION(USE_PCH "USE_PCH" OFF)
+IF(USE_PCH)
+    message("Using precompiled header")
+
+    add_library(nuTens-pch nuTens-pch.hpp)
+
+    ## the headers included in the PCH will (at some point) depend on which tensor library is being used
+    IF(TORCH_FOUND)
+        message( "Including PyTorch includes in the PCH")
+        message( "TORCH_LIBRARIES = ")
+        message( "${TORCH_LIBRARIES}")
+
+        target_compile_definitions(nuTens-pch PUBLIC USE_PYTORCH)
+        SET(PCH_LIBS "${TORCH_LIBRARIES}")
+    ENDIF()
+
+    target_link_libraries(nuTens-pch PUBLIC "${PCH_LIBS}")
+    target_precompile_headers(nuTens-pch PUBLIC nuTens-pch.hpp)
+    set_target_properties(nuTens-pch PROPERTIES LINKER_LANGUAGE CXX)
+
+ENDIF() ## end USE_PCH block
+
 add_subdirectory(nuTens)
 add_subdirectory(tests)

nuTens-pch.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <iostream>
+#include <vector>
+#include <math.h>
+#include <map>
+#include <any>
+#include <variant>
+#include <complex>
+
+#if USE_PYTORCH
+    #include <torch/torch.h>
+#endif

nuTens/propagator/CMakeLists.txt

@@ -9,6 +9,10 @@ add_library(
     const-density-solver.hpp const-density-solver.cpp
 )
 
+IF(USE_PCH)
+    target_precompile_headers(propagator REUSE_FROM tensor)
+ENDIF()
+
 target_link_libraries(propagator PUBLIC tensor constants)
 
 target_include_directories(propagator PUBLIC "${CMAKE_SOURCE_DIR}")

nuTens/tensors/CMakeLists.txt

@@ -1,15 +1,22 @@
 
+
 IF(TORCH_FOUND)
-    message( "Found tensor library: PyTorch")
-
     add_library(tensor STATIC tensor.hpp torch-tensor.cpp)
     target_compile_definitions(tensor PUBLIC USE_PYTORCH)
-    target_link_libraries(tensor PUBLIC "${TORCH_LIBRARIES}")
+ENDIF()
+
+IF(USE_PCH)
+    target_link_libraries(tensor PUBLIC nuTens-pch)
 
 ELSE()
-    message( FATAL_ERROR "No library found to deal with tensors. Currently only pytorch is available, please install this and try again." )
-ENDIF()
+    IF(TORCH_FOUND)
+
+        target_link_libraries(tensor PUBLIC "${TORCH_LIBRARIES}")
 
+    ELSE()
+        message( FATAL_ERROR "No library found to deal with tensors. Currently only pytorch is available, please install this and try again." )
+    ENDIF()
+ENDIF()
 
 target_include_directories(tensor PUBLIC "${CMAKE_SOURCE_DIR}")
 set_target_properties(tensor PROPERTIES LINKER_LANGUAGE CXX)

tests/CMakeLists.txt

@@ -3,27 +3,18 @@ add_library(test-utils test-utils.hpp barger-propagator.hpp)
 target_link_libraries(test-utils PUBLIC constants)
 set_target_properties(test-utils PROPERTIES LINKER_LANGUAGE CXX)
 
-add_executable(tensor-basic tensor-basic.cpp)
-target_link_libraries(tensor-basic PUBLIC tensor test-utils)
-target_include_directories(tensor-basic PUBLIC "${CMAKE_SOURCE_DIR}")
+foreach(TESTNAME 
+    barger tensor-basic two-flavour-vacuum two-flavour-const-matter
+    )
 
-add_test(NAME tensor-basic-test COMMAND tensor-basic)
+    add_executable("${TESTNAME}" "${TESTNAME}.cpp")
+
+    IF(USE_PCH)
+        target_precompile_headers("${TESTNAME}" REUSE_FROM tensor)
+    ENDIF()
 
+    target_link_libraries("${TESTNAME}" PUBLIC test-utils tensor propagator)
+    target_include_directories("${TESTNAME}" PUBLIC "${CMAKE_SOURCE_DIR}")
+    add_test(NAME "${TESTNAME}-test" COMMAND "${TESTNAME}")
 
-add_executable(barger barger-test.cpp)
-target_link_libraries(barger PUBLIC test-utils)
-target_include_directories(barger PUBLIC "${CMAKE_SOURCE_DIR}")
-
-add_test(NAME barger-test COMMAND barger)
-
-
-add_executable(two-flavour-vacuum two-flavour-vacuum.cpp)
-target_link_libraries(two-flavour-vacuum PUBLIC propagator test-utils)
-
-add_test(NAME two-flavour-vacuum-test COMMAND two-flavour-vacuum)
-
-
-add_executable(two-flavour-const-matter two-flavour-const-matter.cpp)
-target_link_libraries(two-flavour-const-matter PUBLIC propagator test-utils)
-
-add_test(NAME two-flavour-const-matter-test COMMAND two-flavour-const-matter)
+endforeach()