android studio编译JNI问题

android studio编译JNI问题

  这几天编译同文trime输入法时遇到一个没法解决的问题，到网上搜也没有答案难道没人遇到类似的问题。问题描述如下：

D:projectandriodtrime-developappsrcmainjniCMakeLists.txt : C/C++ debug|x86 : CMake Error at C:/Users/Administrator/AppData/Local/Android/Sdk/cmake/3.18.1/share/cmake-3.19/Modules/CMakeTestCCompiler.cmake:68 (message):
  The C compiler

    "C:/Users/Administrator/AppData/Local/Android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: D:/project/andriod/trime-develop/app/.cxx/cmake/debug/x86/CMakeFiles/CMakeTmp
    
    Run Build Command(s):C:UsersAdministratorAppDataLocalAndroidSdkcmake3.18.1binninja.exe cmTC_3c0a9 && ninja: fatal: couldn't open nul

于是找到CMakeTestCCompiler.cmake文件发现是以下代码报错：

  file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCCompiler.c
    "#ifdef __cplusplusn"
    "# error "The CMAKE_C_COMPILER is set to a C++ compiler"n"
    "#endifn"
    "#if defined(__CLASSIC_C__)n"
    "int main(argc, argv)n"
    "  int argc;n"
    "  char* argv[];n"
    "#elsen"
    "int main(int argc, char* argv[])n"
    "#endifn"
    "{ (void)argv; return argc-1;}n")
  #message(FATAL_ERROR "hello world")
  try_compile(CMAKE_C_COMPILER_WORKS ${CMAKE_BINARY_DIR}
    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCCompiler.c
    OUTPUT_VARIABLE __CMAKE_C_COMPILER_OUTPUT)
  # Move result from cache to normal variable.
  set(CMAKE_C_COMPILER_WORKS ${CMAKE_C_COMPILER_WORKS})
  unset(CMAKE_C_COMPILER_WORKS CACHE)
  __TestCompiler_restoreTryCompileTargetType()
  if(NOT CMAKE_C_COMPILER_WORKS)
    PrintTestCompilerResult(CHECK_FAIL "broken")
    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
      "Determining if the C compiler works failed with "
      "the following output:n${__CMAKE_C_COMPILER_OUTPUT}nn")
    string(REPLACE "n" "n  " _output "${__CMAKE_C_COMPILER_OUTPUT}")
    message(FATAL_ERROR "hello world, The C compilern  "${CMAKE_C_COMPILER}"n"
      "is not able to compile a simple test program.nIt fails "
      "with the following output:n  ${_output}nn"
      "CMake will not be able to correctly generate this project.")

  其中message命令中的hello world是我为了定位问题加的。file命令将测试代码写入testCCompiler.c，try_compile命令进行编译，成功则CMAKE_C_COMPILER_WORKS的值为true。就是这么简单的测试代码居然报错！！
于是又从github上把ninja代码下载下来，找到subprocess-win32.cc文件找到报错的地方如下：

bool Subprocess::Start(SubprocessSet *set, const string &command)
{
        HANDLE child_pipe = SetupPipe(set->ioport_);

        SECURITY_ATTRIBUTES security_attributes;
        memset(&security_attributes, 0, sizeof(SECURITY_ATTRIBUTES));
        security_attributes.nLength = sizeof(SECURITY_ATTRIBUTES);
        security_attributes.bInheritHandle = TRUE;
        // Must be inheritable so subprocesses can dup to children.必须是可继承的，以便子进程可以复制到子进程
        // HANDLE nul = CreateFileA("D:testCCompiler.c", GENERIC_READ,
        HANDLE nul = CreateFileA("NUL", GENERIC_READ,
                        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                        &security_attributes, OPEN_EXISTING, 0, NULL);
        if (nul == INVALID_HANDLE_VALUE)
                Fatal("hello world, couldn't open nul");

  发现CreateFileA函数的第一个参数居然NUL，心想google这个坑货害人啊。于是改成D:testCCompiler.c结果发现也不对。这时就无计可施了 哭！！
  编译ninja的时候明明好好的，用gcc编译也成功msvc编译也没问题，为什么在android studio上编译就失败呢。心想是不是ndk的cmake版本太低于是升级到3.18.1也没用。于是将本地cmake 3.9中的文件替换掉ndk中的文件重新编译结果还是一样。
  推测因为用本地cmake编译ninja时用的是make没用ninja，而android studio用的是ninja所以才会出错。到此时已经无计可施了。现在只有两个办法一个是修复ninja问题，一个是用make替换ninja看看。刚接触安卓开发很多东西还不熟。
  把ndk下cmake中的ninja.exe复制到独立安装的cmake的bin文件夹中，用ninja替换make果然还是不行，输出如下：

PS D:projectcodeninja-masterbuild_ninja> cmake -G Ninja ..
-- The C compiler identification is GNU 8.1.0
-- The CXX compiler identification is GNU 8.1.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: C:/mingw64/bin/gcc.exe
-- Check for working C compiler: C:/mingw64/bin/gcc.exe - broken
CMake Error at E:/Program Files/CMake/share/cmake-3.19/Modules/CMakeTestCCompiler.cmake:68 (message):
  The C compiler

    "C:/mingw64/bin/gcc.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: D:/projectcode/ninja-master/build_ninja/CMakeFiles/CMakeTmp

    Run Build Command(s):E:/PROGRA~2/CMake/bin/ninja.exe cmTC_753f8 && ninja: fatal: couldn't open nul

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:6 (project)

-- Configuring incomplete, errors occurred!
See also "D:/projectcode/ninja-master/build_ninja/CMakeFiles/CMakeOutput.log".
See also "D:/projectcode/ninja-master/build_ninja/CMakeFiles/CMakeError.log".
PS D:projectcodeninja-masterbuild_ninja>

不行就只能换平台了拿到ubuntu上再看了。