When cross compiling Rust to Android on Windows, Rust 1.69.0+ can't find the version script path.

[moe-deer]

On Windows, when cross compiling Rust code to generate an Android .so library, using Rust versions 1.69.0 or newer can result in compile errors about the version script.
The error happens because the Rust compiler tries to pass a path to a version script to the linker, but that specified path does not actually exist on Windows.

I tried this code:

cargo build --release --target=aarch64-linux-android

I expected to see this happen:

Finished release [optimized] target(s) in 2.44s

Instead, this happened:

error: linking with `D:/NDK/android-ndk-r25c/toolchains/llvm/prebuilt/windows-x86_64/bin/aarch64-linux-android30-clang.cmd` failed: exit code: 255                                                                
  |
  = note: "D:/NDK/android-ndk-r25c/toolchains/llvm/prebuilt/windows-x86_64/bin/aarch64-linux-android30-clang.cmd" "-Wl,--version-script=C:\\Users\\Liste\\AppData\\Local\\Temp\\rustcPwRX2e\\list" "-Wl,--no-undefi
ned-version" "C:\\Users\\Liste\\AppData\\Local\\Temp\\rustcPwRX2e\\symbols.o" "E:\\idea_projects\\my_lib\\target\\aarch64-linux-android\\release\\deps\\my_lib.my_lib.d56b3372c49eacad-cgu.0.rcgu.o" "
-Wl,--as-needed" "-L" "E:\\idea_projects\\my_lib\\target\\aarch64-linux-android\\release\\deps" "-L" "E:\\idea_projects\\my_lib\\target\\release\\deps" "-L" "C:\\Users\\Liste\\.rustup\\toolchains\\stable-
x86_64-pc-windows-msvc\\lib\\rustlib\\aarch64-linux-android\\lib" "-Wl,-Bstatic" "C:\\Users\\Liste\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\aarch64-linux-android\\lib\\libcompiler_builtins-0
1f0855226f8e564.rlib" "-Wl,-Bdynamic" "-ldl" "-llog" "-lunwind" "-ldl" "-lm" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "C:\\Users\\Liste\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\a
arch64-linux-android\\lib" "-o" "E:\\idea_projects\\my_lib\\target\\aarch64-linux-android\\release\\deps\\libmy_lib.so" "-Wl,--gc-sections" "-shared" "-Wl,-z,relro,-z,now" "-Wl,--strip-all" "-nodefaultlibs"
  = note: --version-script=C:\Users\Liste\AppData\Local\Temp\rustcPwRX2e\list"" was unexpected at this time.


warning: `my_lib` (lib) generated 2 warnings                                                                                                                                                                     
error: could not compile `my_lib` (lib) due to previous error; 2 warnings emitted

Meta

rustc --version --verbose:

rustc 1.71.0 (8ede3aae2 2023-07-12)
binary: rustc
commit-hash: 8ede3aae28fe6e4d52b38157d7bfe0d3bceef225
commit-date: 2023-07-12
host: x86_64-pc-windows-msvc
release: 1.71.0
LLVM version: 16.0.5

[jyn514]

you are using an MSVC host toolchain and the compiler is passing unix-style flags. do you see this same problem on windows-gnu or only on MSVC?

[moe-deer]

I encountered this issue on both windows-gnu and MSVC. They work correctly in rust 1.68.2 version, but the problem appears in versions after that.

[apiraino]

@moe-deer Does it also happen with a new Rust project? Any chance you can provide a small bare Rust project template to reproduce the issue? Just to be sure I understand: is the correct Windows path to your Android NDK D:\\NDK\\android-ndk-r25c\\?

[jing332]

Version:

rustc 1.71.0 (8ede3aae2 2023-07-12)
binary: rustc
commit-hash: 8ede3aae28fe6e4d52b38157d7bfe0d3bceef225
commit-date: 2023-07-12
host: x86_64-pc-windows-msvc
release: 1.71.0
LLVM version: 16.0.5

This is because the cmd script cannot parse the parameter

Error: version-script=xx"" was unexpected at this time

---

When I remove the space, =, , it can be passed normally:

[knopp]

Version:

rustc 1.71.0 (8ede3aae2 2023-07-12)
binary: rustc
commit-hash: 8ede3aae28fe6e4d52b38157d7bfe0d3bceef225
commit-date: 2023-07-12
host: x86_64-pc-windows-msvc
release: 1.71.0
LLVM version: 16.0.5

This is because the cmd script cannot parse the parameter

Error: version-script=xx"" was unexpected at this time

When I remove the space, =, , it can be passed normally:

Neither "W, version-script=xx" nor "-Wversion-script" in your case would be proper linker flags. Linker flags are prefixed with -Wl,.

The problem is this line in the clang script:

if "%1" == "-cc1" goto :L

It escapes the first argument, but the argument is already escaped which causes problem in the condition and for some reason cmd unescapes and splits the argument and then complains that the second argument is unexpected.

[knopp]

In other words, the invocation only works as long as first the linker argument doesn't have comma in it.

[knopp]

This seems similar enough, just a different separator: android/ndk#1856.

[soupslurpr]

I am getting this exact error, and this workaround works android/ndk#1856 (comment)

[usernamety]

Has the problem been solved now?

[knopp]

Has the problem been solved now?

This is not a Rust error. It is a problem with the CMD wrapper in Android SDK. I believe cargo-ndk is not calling the wrapper script anymore.

[darcycui]

This seems similar enough, just a different separator: android/ndk#1856.

This solved my problem,thanks very much!