如何通过SConstruct（mingw工具）在Linux环境自动编译Windows平台.dll文件

I’ve run into similar cross-compiling quirks with SCons before, so let’s fix this step by step. The core issue is that SCons relies on the target platform context to determine valid shared library suffixes—when you don’t explicitly specify you’re targeting Windows, it defaults to your host (Linux) and expects .so files. Here’s how to configure separate environments for both platforms and build both libraries in one go:

Final Working SConstruct Code #

import os

cpp_source = 'theone.cpp'

# 1. Configure environment for Windows cross-compilation (MinGW)
win_env = Environment(
    tools=['mingw'],
    platform='win32',  # Tells SCons we're targeting Windows
    CXX='x86_64-w64-mingw32-g++'
)
# Build Windows DLL (SCons will automatically append .dll)
win_dll = win_env.SharedLibrary('foo', cpp_source)

# 2. Configure environment for native Linux compilation
linux_env = DefaultEnvironment()
# Build Linux shared library (SCons appends .so by default)
linux_so = linux_env.SharedLibrary('foo', cpp_source)

# Set both targets as default so `scons` builds both
Default([win_dll, linux_so])

Why This Works #

Fixing the DLL Build Error #

Your earlier attempt failed because you manually added .dll to the target name, but SCons still thought you were targeting Linux (since platform wasn’t set). By explicitly setting platform='win32', SCons switches to Windows-specific rules:

• It automatically uses .dll as the shared library suffix, so you only need to specify the base name foo
• It adjusts linker flags appropriately for Windows DLLs (like generating the libfoo.a import library)

Separate Environments #

We create two distinct environments to keep cross-compilation and native build settings isolated:

• The win_env uses the MinGW toolchain and follows Windows platform rules
• The linux_env uses your system’s default GCC compiler and Linux platform rules

Verification #

After running scons, you’ll get:

• libfoo.so: Native Linux shared library
• libfoo.dll: Windows 64-bit DLL (along with libfoo.a, the import library needed for linking on Windows)

You can test the DLL on Windows 10 as you did before—it should work exactly like your manually compiled version.

Prerequisite Check #

Make sure you have the MinGW-w64 toolchain installed on Ubuntu:

sudo apt update && sudo apt install gcc-mingw-w64-x86-64

内容的提问来源于stack exchange，提问作者Beyto A.