OpenHarmony开发实战探索：Linux 环境 SDK (进阶--依赖库的解决方法)

我们在移植三方库的时候，很多库是有依赖的。面对这种情况我们应该如何处理。下面以libzip为例讲解下如何为ohos编译带依赖的库。

编译libzip

源码准备

下载最新版本的 libzip 和 xz （libzip 是可以依赖 xz 项目中的 liblzma.so 的）

#解压源码
ohos@ubuntu20:~/openHarmony/ohos_libzip$ ls
libzip-1.9.2.tar.gz  xz-5.4.1.tar.gz
ohos@ubuntu20:~/openHarmony/ohos_libzip$
ohos@ubuntu20:~/openHarmony/ohos_libzip$ tar -zxf xz-5.4.1.tar.gz
ohos@ubuntu20:~/openHarmony/ohos_libzip$ tar -zxf libzip-1.9.2.tar.gz
ohos@ubuntu20:~/openHarmony/ohos_libzip$ ls
libzip-1.9.2  libzip-1.9.2.tar.gz  xz-5.4.1  xz-5.4.1.tar.gz
ohos@ubuntu20:~/openHarmony/ohos_libzip$

编译libzip

ohos@ubuntu20:~/openHarmony/ohos_libzip$
ohos@ubuntu20:~/openHarmony/ohos_libzip$ export OHOS_SDK=/home/ohos/tools/OH_SDK/ohos-sdk/linux
ohos@ubuntu20:~/openHarmony/ohos_libzip$ cd libzip-1.9.2/
ohos@ubuntu20:~/openHarmony/ohos_libzip/libzip-1.9.2$ ls
android         AUTHORS       cmake-config.h.in   examples    libzip-config.cmake.in  man        regress      THANKS
API-CHANGES.md  cmake         CMakeLists.txt      INSTALL.md  libzip.pc.in            NEWS.md    SECURITY.md  TODO.md
appveyor.yml    cmake-compat  cmake-zipconf.h.in  lib         LICENSE                 README.md  src
ohos@ubuntu20:~/openHarmony/ohos_libzip/libzip-1.9.2$ mkdir ohos64build
ohos@ubuntu20:~/openHarmony/ohos_libzip/libzip-1.9.2$ cd ohos64build/
ohos@ubuntu20:~/openHarmony/ohos_libzip/libzip-1.9.2/ohos64build$ ${OHOS_SDK}/native/build-tools/cmake/bin/cmake -DCMAKE_TOOLCHAIN_FILE=${OHOS_SDK}/native/build/cmake/ohos.toolchain.cmake  .. -L
-- The C compiler identification is Clang 12.0.1
-- Check for working C compiler: /home/ohos/tools/OH_NDK/ohos-sdk/linux/native/llvm/bin/clang
-- Check for working C compiler: /home/ohos/tools/OH_NDK/ohos-sdk/linux/native/llvm/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Looking for include file CommonCrypto/CommonCrypto.h
-- Looking for include file CommonCrypto/CommonCrypto.h - not found
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
-- Could NOT find Nettle (missing: Nettle_LIBRARY Nettle_INCLUDE_DIR) (Required is at least version "3.0")
-- Could NOT find GnuTLS (missing: GNUTLS_LIBRARY GNUTLS_INCLUDE_DIR)
-- Could NOT find MbedTLS (missing: MbedTLS_LIBRARY MbedTLS_INCLUDE_DIR) (Required is at least version "1.0")
# 删除大量日志
-- Check if the system is big endian - little endian
-- Found ZLIB: /home/ohos/tools/OH_NDK/ohos-sdk/linux/native/sysroot/usr/lib/aarch64-linux-ohos/libz.so (found suitable version "1.2.12", minimum required is "1.1.2")
-- Could NOT find BZip2 (missing: BZIP2_LIBRARIES BZIP2_INCLUDE_DIR)
CMake Warning at CMakeLists.txt:186 (message):
  -- bzip2 library not found; bzip2 support disabled

# 可以发现此时是无法找到 liblzma 的，这样虽然没有报错，但是编译出来的libzip是不支持 lzma 算法的。为了使我们编译出来的libzip支持lamz算法，我们希望这里能找到liblzma.so
-- Could NOT find LibLZMA (missing: LIBLZMA_LIBRARY LIBLZMA_INCLUDE_DIR LIBLZMA_HAS_AUTO_DECODER LIBLZMA_HAS_EASY_ENCODER LIBLZMA_HAS_LZMA_PRESET) (Required is at least version "5.2")
CMake Warning at CMakeLists.txt:195 (message):
  -- lzma library not found; lzma/xz support disabled


-- Could NOT find Zstd (missing: Zstd_LIBRARY Zstd_INCLUDE_DIR) (Required is at least version "1.3.6")
CMake Warning at CMakeLists.txt:204 (message):
  -- zstd library not found; zstandard support disabled


CMake Warning at CMakeLists.txt: