scons can't find #include files - c++

Question

I am following this tutorial on setting up gdnative.
I have installed c++ tools through visual studio, python 3.2, and scons 4.1.0
I am stuck trying to get scons to build this gdnative example. The issue I'm having appears to be scons not being able to find #include files. I have tried using a relative file paths to a sub directory godot-cpp/, relative paths to a sibling directory ../godot-cpp/, and using a full path to the sibling directory E:/Projects/Godot Projects/Units/godot-cpp/ but I am getting the same error every time. I have provided a screenshot to show the file structure. I am running scons from X64 Native Tools Command Prompt for VS 2019
Edit - have now also tried while running as administrator, same error
Top Left: The project I am trying to build and the cpp files I need to include in sibling directories.
Top Right: The contents of the project folder. The godot-cpp/ subdirectory is a copy of the folder of the same name from the Top Left.
Bottom Left: Contents of godot-cpp/
Bottom Right: Contents of godot-cpp/godot-headers. The highlighted file is the one it can't seem to find.
Relative path to sub directory:
E:\Projects\Godot Projects\Units\gdnative_cpp_example>scons platform=windows
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
cl /Fosrc\gdexample.obj /c src\gdexample.cpp /TP /nologo -DWIN32 -D_WIN32 -D_WINDOWS -W3 -GR -D_CRT_SECURE_NO_WARNINGS -EHsc -D_DEBUG -MDd /I. /Igodot-cpp\godot_headers /Igodot-cpp\include /Igodot-cpp\include\core /Igodot-cpp\include\gen /Isrc
gdexample.cpp
godot-cpp\include\core\Godot.hpp(7): fatal error C1083: Cannot open include file: 'gdnative_api_struct.gen.h': No such file or directory
scons: *** [src\gdexample.obj] Error 2
scons: building terminated because of errors.
Relative path to sibling directory:
E:\Projects\Godot Projects\Units\gdnative_cpp_example>scons platform=windows
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
cl /Fosrc\gdexample.obj /c src\gdexample.cpp /TP /nologo -DWIN32 -D_WIN32 -D_WINDOWS -W3 -GR -D_CRT_SECURE_NO_WARNINGS -EHsc -D_DEBUG -MDd /I. "/IE:\Projects\Godot Projects\Units\godot-cpp\godot_headers" "/IE:\Projects\Godot Projects\Units\godot-cpp\include" "/IE:\Projects\Godot Projects\Units\godot-cpp\include\core" "/IE:\Projects\Godot Projects\Units\godot-cpp\include\gen" /Isrc
gdexample.cpp
E:\Projects\Godot Projects\Units\godot-cpp\include\core\Godot.hpp(7): fatal error C1083: Cannot open include file: 'gdnative_api_struct.gen.h': No such file or directory
scons: *** [src\gdexample.obj] Error 2
scons: building terminated because of errors.
Full path to sibling directory:
E:\Projects\Godot Projects\Units\gdnative_cpp_example>scons platform=windows
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
cl /Fosrc\gdexample.obj /c src\gdexample.cpp /TP /nologo -DWIN32 -D_WIN32 -D_WINDOWS -W3 -GR -D_CRT_SECURE_NO_WARNINGS -EHsc -D_DEBUG -MDd /I. "/IE:\Projects\Godot Projects\Units\godot-cpp\godot_headers" "/IE:\Projects\Godot Projects\Units\godot-cpp\include" "/IE:\Projects\Godot Projects\Units\godot-cpp\include\core" "/IE:\Projects\Godot Projects\Units\godot-cpp\include\gen" /Isrc
gdexample.cpp
E:\Projects\Godot Projects\Units\godot-cpp\include\core\Godot.hpp(7): fatal error C1083: Cannot open include file: 'gdnative_api_struct.gen.h': No such file or directory
scons: *** [src\gdexample.obj] Error 2
scons: building terminated because of errors.
It's getting stuck following the include statement from Godot.hpp line 7 to gdnative_api_struct.gen.h. It looks like it can resolve the path just fine but it can't open them for some reason.
SConstruct file - Came with the project I'm trying to build. Only modification was changing the paths to godot-cpp/ and godot-cpp/headers/.
#!python
import os, subprocess
opts = Variables([], ARGUMENTS)
# Gets the standard flags CC, CCX, etc.
env = DefaultEnvironment()
# Define our options
opts.Add(EnumVariable('target', "Compilation target", 'debug', ['d', 'debug', 'r', 'release']))
opts.Add(EnumVariable('platform', "Compilation platform", '', ['', 'windows', 'x11', 'linux', 'osx']))
opts.Add(EnumVariable('p', "Compilation target, alias for 'platform'", '', ['', 'windows', 'x11', 'linux', 'osx']))
opts.Add(BoolVariable('use_llvm', "Use the LLVM / Clang compiler", 'no'))
opts.Add(PathVariable('target_path', 'The path where the lib is installed.', 'demo/bin/'))
opts.Add(PathVariable('target_name', 'The library name.', 'libgdexample', PathVariable.PathAccept))
# Local dependency paths, adapt them to your setup
# These next two lines are where I changed the paths <-----------------
godot_headers_path = "../godot-cpp/godot_headers/"
cpp_bindings_path = "../godot-cpp/"
cpp_library = "libgodot-cpp"
# only support 64 at this time..
bits = 64
# Updates the environment with the option variables.
opts.Update(env)
# Process some arguments
if env['use_llvm']:
env['CC'] = 'clang'
env['CXX'] = 'clang++'
if env['p'] != '':
env['platform'] = env['p']
if env['platform'] == '':
print("No valid target platform selected.")
quit();
# Check our platform specifics
# I'm using windows so I cut the other options for readability
if env['platform'] == "windows":
env['target_path'] += 'win64/'
cpp_library += '.windows'
# This makes sure to keep the session environment variables on windows,
# that way you can run scons in a vs 2017 prompt and it will find all the required tools
env.Append(ENV = os.environ)
env.Append(CCFLAGS = ['-DWIN32', '-D_WIN32', '-D_WINDOWS', '-W3', '-GR', '-D_CRT_SECURE_NO_WARNINGS'])
if env['target'] in ('debug', 'd'):
env.Append(CCFLAGS = ['-EHsc', '-D_DEBUG', '-MDd'])
else:
env.Append(CCFLAGS = ['-O2', '-EHsc', '-DNDEBUG', '-MD'])
if env['target'] in ('debug', 'd'):
cpp_library += '.debug'
else:
cpp_library += '.release'
cpp_library += '.' + str(bits)
# make sure our binding library is properly includes
env.Append(CPPPATH=['.', godot_headers_path, cpp_bindings_path + 'include/', cpp_bindings_path + 'include/core/', cpp_bindings_path + 'include/gen/'])
env.Append(LIBPATH=[cpp_bindings_path + 'bin/'])
env.Append(LIBS=[cpp_library])
# tweak this if you want to use different folders, or more folders, to store your source code in.
env.Append(CPPPATH=['src/'])
sources = Glob('src/*.cpp')
library = env.SharedLibrary(target=env['target_path'] + env['target_name'], source=sources)
Default(library)
# Generates help for the -h scons option.
Help(opts.GenerateHelpText(env))

Answer 1

I had this exact same problem today. On the line you changed in your SConstruct file you reference the godot headers directory (the one which contains gdnative_api_struct.gen.h) as godot_headers, but in your file system this folder is called godot-headers (- not _). Because of this scons cannot find the file. Changing the directory's name in the file system to godot_headers solved the problem for me.