[error record] no matching function for call to 'cacheflush' cacheflush();)

One 、 Error message

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Use Visual Studio 2019 compile Android Platform NDK project ; Compile times error ;

Error message :

1>./native/native.cpp(428,14): warning G0C39A92D: 'SearchCode' has C-linkage specified, but returns user-defined type 'std::string' (aka 'basic_string<char>') which is incompatible with C [-Wreturn-type-c-linkage]1>        std::string SearchCode(unsigned char* data,unsigned size){ 
    1>                    ^1>./native/native.cpp(658,5): error GEF7559A7: no matching function for call to 'cacheflush'1>                                cacheflush();1>                                ^~~~~~~~~~1>D:/001_Develop/001_SDK/Sdk/ndk/android-ndk-r14b/build//../platforms/android-19/arch-arm/usr/include\unistd.h:183:12: note: candidate function not viable: requires 3 arguments, but 0 were provided1>extern int cacheflush(long start, long end, long flags);1>           ^1>1 warning and 1 error generated.1>make: *** [obj/local/armeabi-v7a/objs/native/native/native.o] Error 11>D:\001_Develop\017_Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(46,5): error MSB3073:  command “"D:\001_Develop\001_SDK\Sdk\ndk\android-ndk-r14b\build\ndk-build.cmd" NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk NDK_APPLICATION_MK=Application.mk ” Exited , The code is  2.1> The build project is complete “magic.vcxproj” The operation of  -  Failure .==========  Generate :  success  0  individual , Failure  1  individual , newest  0  individual , skip  0  individual  ==========

Two 、 Error message

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Study the error message carefully , Find out D:/001_Develop/001_SDK/Sdk/ndk/android-ndk-r14b/build//../platforms/android-19/arch-arm/usr/include\unistd.h:183:12: note: candidate function not viable: requires 3 arguments, but 0 were provided , The called function header file is android-19/arch-arm/usr/include\unistd.h , This is a ARM Header file for platform , The functions defined are ARM Functions of Architecture ;

stay ARM Architecturally android-19/arch-arm/usr/include/unistd.h Header file , cacheflush Function is :

extern int cacheflush(long start, long end, long flags);

stay x86 The system call in the schema is invalid ;

If the target of the compilation function library or Executable file The architecture has x86 framework , You're going to report a mistake , Because this function only supports ARM framework ;

#ifndef __i386__				cacheflush();

stay Application.mk in , To declare only x86 Compile function library , Comment out armeabi-v7aarmeabi These two target architectures ;

APP_ABI					:= x86 #armeabi-v7a armeabiAPP_STL					:= gnustl_staticAPP_PLATFORM			:= android-19

involve CPU In operation , Pay attention to the compiled Architecture , And referenced dependent Libraries ;

cacheflush The function is the refresh function in the system call CPU Cached functions , Different CPU framework , The corresponding implementation is also different ;