Android Studio Cmake 无法确定目标的链接器语言答案

【问题标题】：Android Studio Cmake cannot determine linker language for targetAndroid Studio Cmake 无法确定目标的链接器语言
【发布时间】：2019-03-26 02:42:28
【问题描述】：

我尝试将我的根 app/ 文件链接到 C++ 项目，但一直收到此错误。

CMake Error at CMakeLists.txt:15 (add_library):


    src/main/cpp/iob.c


  Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp


  .hxx .in .txx


CMake Error: CMake can not determine linker language for target: iob

我的CMakeLists.txt 文件包含在src/min/cpp 中，以及它说找不到的iob.c 文件。我做错了什么？

这是我的CMakeLists.txt

# Sets the minimum version of CMake required to build your native library.
# This ensures that a certain set of CMake features is available to
# your build.

cmake_minimum_required(VERSION 3.4.1)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Werror")

# Specifies a library name, specifies whether the library is STATIC or
# SHARED, and provides relative paths to the source code. You can
# define multiple libraries by adding multiple add.library() commands,
# and CMake builds them for you. When you build your app, Gradle
# automatically packages shared libraries with your APK.

add_library( # Specifies the name of the library.
         iob

         # Sets the library as a shared library.
         SHARED

         # Provides a relative path to your source file(s).
         src/main/cpp/iob.c )

【问题讨论】：

你能显示你项目的文件层次结构吗？ BTW，通过命名cpp/子目录暗示了C++文件，你确定iob.c文件，对应C语言？

标签： android cmake android-ndk java-native-interface

【解决方案1】：

如果CMakeLists.txt 在src/main/cpp 目录中（这是AS 向导生成C++ 项目的方式），那么你应该说

add_library( # Specifies the name of the library.
     iob

     # Sets the library as a shared library.
     SHARED

     # Provides a relative path to your source file(s).
     iob.c )

源文件的相对路径是相对于CMakeLists.txt 计算的。

【讨论】：