错误:为aarch64-linux-android目标使用未声明的标识符“PTHREAD_MUTEX_ROBUST”cargo构建liblmdb-sys

Question

我正在尝试将一个锈蚀工程编译成一个Android目标(aarch64-linux-android)。

从lmdb码中的注释来看，它似乎需要运行编译

"aarch64-linux-android-gcc" "-O2" "-ffunction-sections" "-fdata-sections" "-fPIC" "-Wall" "-Wextra" "-o" "/Users/username/grin-wallet/target/aarch64-linux-android/release/build/liblmdb-sys-7a2d430dc3c9f3e3/out/mdb/libraries/liblmdb/mdb.o" "-c" "mdb/libraries/liblmdb/mdb.c"

带有额外的-DMDB_USE_ROBUST=0标志。通过cargo build命令或向Cargo.toml添加某些内容，这是可配置的吗？

我得到的错误是：

error: failed to run custom build command for `liblmdb-sys v0.2.2`

Caused by:
  process didn't exit successfully: `/Users/username/grin-wallet/target/release/build/liblmdb-sys-b6bfc7b665736f9b/build-script-build` (exit code: 101)
--- stdout
TARGET = Some("aarch64-linux-android")
TARGET = Some("aarch64-linux-android")
HOST = Some("x86_64-apple-darwin")
TARGET = Some("aarch64-linux-android")
TARGET = Some("aarch64-linux-android")
HOST = Some("x86_64-apple-darwin")
CC_aarch64-linux-android = None
CC_aarch64_linux_android = None
TARGET_CC = None
CC = None
TARGET = Some("aarch64-linux-android")
HOST = Some("x86_64-apple-darwin")
CFLAGS_aarch64-linux-android = None
CFLAGS_aarch64_linux_android = None
TARGET_CFLAGS = None
CFLAGS = None
DEBUG = Some("false")
running: "aarch64-linux-android-gcc" "-O2" "-ffunction-sections" "-fdata-sections" "-fPIC" "-Wall" "-Wextra" "-o" "/Users/username/grin-wallet/target/aarch64-linux-android/release/build/liblmdb-sys-7a2d430dc3c9f3e3/out/mdb/libraries/liblmdb/mdb.o" "-c" "mdb/libraries/liblmdb/mdb.c"
cargo:warning=mdb/libraries/liblmdb/mdb.c:4625:13: warning: implicit declaration of function 'pthread_mutexattr_setrobust' is invalid in C99 [-Wimplicit-function-declaration]
cargo:warning=                        || (rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST))
cargo:warning=                                 ^
cargo:warning=mdb/libraries/liblmdb/mdb.c:4625:49: error: use of undeclared identifier 'PTHREAD_MUTEX_ROBUST'
cargo:warning=                        || (rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST))
cargo:warning=                                                                     ^
cargo:warning=mdb/libraries/liblmdb/mdb.c:9821:33: warning: unused parameter 'env' [-Wunused-parameter]
cargo:warning=mdb_env_get_maxkeysize(MDB_env *env)
cargo:warning=                                ^
cargo:warning=mdb/libraries/liblmdb/mdb.c:10002:10: warning: implicit declaration of function 'pthread_mutex_consistent' is invalid in C99 [-Wimplicit-function-declaration]
cargo:warning=                        rc2 = mdb_mutex_consistent(mutex);
cargo:warning=                              ^
cargo:warning=mdb/libraries/liblmdb/mdb.c:351:37: note: expanded from macro 'mdb_mutex_consistent'
cargo:warning=#define mdb_mutex_consistent(mutex)     pthread_mutex_consistent(mutex)
cargo:warning=                                        ^
cargo:warning=3 warnings and 1 error generated.
exit code: 1

Answer 1

首先，确保安装了所有android构建目标：

rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android

然后是install cargo-ndk

cargo install cargo-ndk

现在，您需要在终端中导出许多变量，这些变量将被构建使用。

如果您正在使用pkg-config，那么

export PKG_CONFIG_ALLOW_CROSS=1

NDK的根目录

export NDK_HOME=the_path_to_the_ndk

平台版本

export NDK_API_LEVEL=the_api_level

请注意，对于NDK的较新版本，编译器必须指定为clang，因为GCC在android工具链中被废弃，并且不再存在(一些项目在默认情况下试图引用GCC )。

export CC=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android$NDK_API_LEVEL-clang
export CXX=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android$NDK_API_LEVEL-clang++

然后剩下的变量

export AR=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-ar
export AS=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-as
export LD=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-ld
export RANLIB=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-ranlib
export STRIP=$NDK_HOME/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip

您认为-DMDB_USE_ROBUST=0是正确的，它只需要传递到编译器标志。

export CFLAGS=-DMDB_USE_ROBUST=0

然后，在您的生锈项目中，您需要在与您的.config文件相同的目录中创建一个.toml目录。在.config目录中，您需要创建一个配置文件。

在配置文件中，您需要为需要构建的每个目标指定相关的构建目标(将NDK_HOME和NDK_API_LEVEL替换为各自的值)。

[target.aarch64-linux-android]
ar = "<NDK_HOME>/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-ar"
linker = "<NDK_HOME>/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android<NDK_API_LEVEL>-clang"

然后，您应该能够成功地构建

cargo ndk --target aarch64-linux-android --android-platform $NDK_API_LEVEL -- build --release

Answer 2

你不能仅仅构建并瞄准linex- Android，另一种方法是通过Android或通过Flutter开发应用程序。