Scons randomly failing on Windows, getting confused about .o files (?)

[myblindy]

Godot version

v4.5.1-stable

godot-cpp version

4.3

System information

Windows 11

Issue description

I cloned the template project and added a class and built it once and it worked fine, showed in Godot and everything. Then I added a few methods and scons stopped working with no compilation or link time errors:

Steps to reproduce

PS E:\gitrepos\GdVectorSvgControl> scons
scons: Reading SConscript files ...
Auto-detected 32 CPU cores available for build parallelism. Using 31 cores by default. You can override it with the -j argument.
Building for architecture x86_64 on platform windows
scons: done reading SConscript files.
scons: Building targets ...
Compiling godot-cpp\src\godot.cpp ...
Compiling godot-cpp\src\classes\editor_plugin_registration.cpp ...
Compiling godot-cpp\src\classes\low_level.cpp ...
Compiling godot-cpp\src\classes\wrapped.cpp ...
Compiling godot-cpp\src\core\class_db.cpp ...
Compiling godot-cpp\src\core\error_macros.cpp ...
Compiling godot-cpp\src\core\memory.cpp ...
Compiling godot-cpp\src\core\method_bind.cpp ...
Compiling godot-cpp\src\core\object.cpp ...
Compiling godot-cpp\src\core\print_string.cpp ...
scons: *** [godot-cpp\src\godot.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\classes\editor_plugin_registration.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\classes\low_level.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\classes\wrapped.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\core\class_db.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\core\error_macros.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\core\memory.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\core\method_bind.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\core\object.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: *** [godot-cpp\src\core\print_string.windows.template_debug.x86_64.o] The system cannot find the file specified
scons: building terminated because of errors.
PS E:\gitrepos\GdVectorSvgControl> cl
Microsoft (R) C/C++ Optimizing Compiler Version 19.50.35719 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

usage: cl [ option... ] filename... [ /link linkoption... ]

Why is it getting confused about .o files? This is a Windows build with MSVC installed and working. Can I tell it somehow to compile correctly or something? And why did it randomly break after working once?

Minimal reproduction project

https://github.com/myblindy/GdVectorSvgControl

[Alfrink]

My guess would be that you don't have g++ installed; I got similar errors when I mistakenly assumed that scons would use the mingw toolchain I had bundled with CLion, but had to install mingw manually and add its bin directory (including g++) to PATH so the build would run. However, that wouldn't explain why it worked for you on your first attempt - are you sure you didn't change anything about your environment between those two builds? Does it work again if you remove those "few methods" you added?