char*, CvFileNode*): error: undefined reference to'std::string::at(unsigned int)'C:/sdk/opencv-3.4.2-android-sdk/sdk/native/staticlibs/armeabi-v7a/libopencv_core.a(persistence.cpp.o):persistence.cpp:function
~/Desktop/c++learning/quiz1> gcc -o num1 num1.cpp /tmp/ccmz5SRA.o: In function `ReadNumber(void)': num1.cpp:(.text+0x21): undefined reference to `cout' num1.cpp:(.text+0x29): undefined reference to `ostream::operator<<(char const *)' num1.cpp:(.text+0x39): undefined refer...
*/ #ifndef _GLIBCXX_CSTDINT #define _GLIBCXX_CSTDINT 1 #pragma GCC system_header #if __cplusplus < 201103L # include <bits/c++0x_warning.h> #else #include <bits/c++config.h> #if _GLIBCXX_HAVE_STDINT_H # include <stdint.h> #endif #ifdef _GLIBCXX_USE_C99_STDINT_TR1 namespace std ...
(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, absl::string_view) in FirebaseFirestore(string_view.o) "std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::~sentry()", referenced from: absl::operator<<(std::__1::basic_ostream<char, std...