An “Undefined Reference” error occurs when we have a reference to object name (class, function, variable, etc.) in our program and the linker cannot find its definition when it tries to search for it in all the linked object files and libraries. Thus when the linker cannot find the def...
This will automatically add the directory of the library to the project’s LD_LIBRARY_PATH variable, so now you will be able to launch it successfully: If you are running the project manually, simply add the directory of the missing.sofile to the LD_LIBRARY_PATH variable as shown below an...
从图中我们可以看到有大量的 符号(函数或全局变量) 找不到实现体,即我们常说的 undefined reference to 的链接错误。 在此之前,我也写过一篇关于如何快速解决此类 undefined reference to 问题的方法,见:【经验科普】实战分析C工程代码可能遇到的编译问题及其解决思路 第3.5.1 章节。 2.2 快速排查 根据上面参考文章...
8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(Camera_Settings.cpp.obj): in functioncapturePhotoSaveSpiffs': C:/Espressif/frameworks/esp-idf-v4.4.5/workspace/GAZZELE_MINI/main/DriverModules/CamDrivers/Camera_Settings.cpp:194: undefined reference toesp_camera_fb...
// file2.c extern int global_variable; // 未包含file1.c的声明,导致未定义引用错误如何检测和调试...gcc -Wall -Wextra -o program file1.c file2.c 解决Undefined Reference的最佳实践确保函数定义存在:每个函数调用都应该有对应的函数定义。...总结 Undefined Reference是C语言编译过程中常见且令人头疼的...
hello all. Earlier i using esp-idf 4.1 now upgrated to 5.0 but not compiled my program. where is the problem . my app_main: void app_main(void) { bla bla bla } error: /home/maniac/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0...
What is odd is that this structure seems identical to another program I have linking just fine which used the ADS1220_WE library defining a similar object the same way. What am I missing here? (I have tried extern statements in several places to no avail). THANK YOU. Last edited on Jan...
cannot declare variable ‘impl’ to be of abstract type ‘CountingPlayer’ because the subclass becomes abstract But if I include the declaration ('bool Method(struct x, struct y)') in the subclass implementation, I get the 'undefined reference to vtable' error. ...
Looking at this forum post, it seems like adding cyfxcppsyscall.cpp would fix it however I then get errors where `extern char __heap_start`and `extern char __heap_end` are missing. How do I solve this _sbrk error? Is there a better way to approach variable sized USB descri...
but I changed it do a static library and removed the dll export things. Then I want to use this library in a C++ project.I wrapped an extern "C" around the include of the header files to eliminate name mangling. However, I got linker errors for the library functions (undefined ...