Apart from the causes already discussed, “undefined reference” may also occur because of the following reasons. #4) Wrong Project Type. When we specify wrong project types in C IDEs like the visual studio and try to do things that the project does not expect, then, we get “undefined reference”. The function I tried to use was ceil and I get the following error:: undefined reference to `ceil' collect2: ld returned 1 exit status I am using the latest Ubuntu and math.h is there. I tried to use -lm in a different computer and it work perfectly. Does anyone know how to solve this problem?

1. Undefined Reference To Ceil'
2. Undefined Reference To Symbol Ceil

Undefined Reference To Ceil'

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: undefined reference to `ceil' collect2: ld returned 1 exit status I've also tried #cc -lm myprogram.c and then tried compiling it, but this didn't help and displayed the same message. An alternative situation arises where the source for foo is in a separate source file foo.c (and there's a header foo.h to declare foo that is included in both foo.c and undefinedreference.c). Then the fix is to link both the object file from foo.c and undefinedreference.c, or to compile both the source files.

Undefined Reference To Symbol Ceil