안드로이드 NDK16 오류 ("연산자 '<<'가 모호합니다 (피연산자 유형 'basic_ostream <char, std :: char_traits <char>'및 'long long')"

Question

NDK 15c에서 NDK16b로 전환하려는 시도에서 ' ostream에 64 비트 오래 오래 값을 기록하려고 레거시 코드를 컴파일 걸림돌을 공격했습니다.

나는 NDK 헤더 파일을 검색 한 #ifdef _STLP_LONG_LONG 다음 정의 된 경우 ostream에 연산자를 지원해야한다는 std/_ostream 나에게 보인다 내가 무엇을하려고하는지.

내가 이것을 가능하게하기 위해 무엇을해야 하는지를 알지 못한다. 나는 그것을 사용할 수 없게 -D_STLP_LONG_LONG으로 정의하려고 시도했다.

내 툴체인은 NDK의 clang 컴파일러를 사용하고 있습니다.

MyInfo.cc:6499:33: error: use of overloaded operator '<<' is ambiguous (with operand types 'basic_ostream<char, std::char_traits<char> >' and 'long long') 
     os << basename << ":" << (long long) val; 
     ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ 
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:104:10: note: candidate function 
_Self& operator<<(unsigned char __x) { _M_put_char(__x); return *this; } 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:106:10: note: candidate function 
_Self& operator<<(short __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:107:10: note: candidate function 
_Self& operator<<(unsigned short __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:108:10: note: candidate function 
_Self& operator<<(int __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:110:10: note: candidate function 
_Self& operator<<(unsigned int __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:117:10: note: candidate function 
_Self& operator<<(long __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:118:10: note: candidate function 
_Self& operator<<(unsigned long __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:123:10: note: candidate function 
_Self& operator<<(float __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:124:10: note: candidate function 
_Self& operator<<(double __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:126:10: note: candidate function 
_Self& operator<<(long double __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:130:10: note: candidate function 
_Self& operator<<(bool __x); 
    ^
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:304:1: note: candidate function [with _Traits = std::char_traits<char>] 
operator<<(basic_ostream<char, _Traits>& __os, char __c) { 
^ 
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:297:1: note: candidate function [with _CharT = char, _Traits = std::char_traits<char>] 
operator<<(basic_ostream<_CharT, _Traits>& __os, char __c) { 
^ 
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:311:1: note: candidate function [with _Traits = std::char_traits<char>] 
operator<<(basic_ostream<char, _Traits>& __os, signed char __c) { 
^ 
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_ostream.h:318:1: note: candidate function [with _Traits = std::char_traits<char>] 
operator<<(basic_ostream<char, _Traits>& __os, unsigned char __c) { 
^ 
/Users/spartygw/android-toolchain/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../include/c++/4.9.x/stl/_iomanip.h:96:1: note: candidate function [with _CharT = char, _Traits = std::char_traits<char>] 
operator<<(basic_ostream<_CharT, _Traits>& __os, 
^ 

Answer 1

_STLP_LONG_LONGSTLPort macro는이다

여기서 실제 컴파일러 출력된다. 실제로 STLPort를 사용한다면 NDK에서 stl_mycomp.h 파일을 편집해야 할 수도 있습니다.

그러나 STLPort only supports C++98부터 NDK r16부터는 더 이상 사용되지 않으므로 대신 libC++를 사용해야합니다 (NDK r16 이전에는 gnustl도 옵션이 될 수 있음).