Undefined reference to log10

I am building using Eclipse Kepler, and have included math.h . However, I am getting an error

Also types uint8_t and unit32_t are not being resolved. I have included both stdint.h and inttypes.h , just to be sure, but wasn’t successful. Can someone kindly help?

1 Answer 1

Because, the header file only provides the forward declaration of the function. The actual function definition is present in the ("math") library. You need to link with the math library using -lm .

Reference: man page for log10

Also, AFAIK, uint _t are present in . Please check for the existence for the header file itself and/or any typos (like unit32_t in your example) in your code.

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I am building using Eclipse Kepler, and have included math.h . However, I am getting an error

Also types uint8_t and unit32_t are not being resolved. I have included both stdint.h and inttypes.h , just to be sure, but wasn’t successful. Can someone kindly help?

1 Answer 1

Because, the header file only provides the forward declaration of the function. The actual function definition is present in the ("math") library. You need to link with the math library using -lm .

Reference: man page for log10

Also, AFAIK, uint _t are present in . Please check for the existence for the header file itself and/or any typos (like unit32_t in your example) in your code.

Имеется Qt_5_3_MinGW_32bit, Windiws 7 64bit.
Работаю в графическом приложении QT.
В хэдере (mainwindow.h) обявлено следующее:

Далее при нажатии на кнопку вызываю метод void separateImage(char* path_to_image);
mainwindow.cpp :
На кнопке написано следующее:

Возникающие ошибки:
D:QtProjectsLabArcheo_PartCeramicResiduesAsMosaicmainwindow.cpp:104: ошибка: undefined reference to `MainWindow::separateImage(char*)’
и
collect2.exe:-1: ошибка: error: ld returned 1 exit status

Данная ошибка возникает, если вместо char передавать QString, соответственно, изменив функцию separate_image.

Часть кода separate_image выглядит следующим образом:

• Вопрос задан более трёх лет назад
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Часть кода separate_image выглядит следующим образом:

Так как separateImage() вы объявили как приватный метод класса MainWindow.
Внимательно читаем документацию на Qt и учебник по языку C++.