How to Fix 'Undefined Symbol: G77_date_and_time_0' Error in Fortran Subroutine?

In summary, the error message "Fortran undefined symbol f90" means that the code is trying to use a function or variable that has not been defined or declared in the program. To fix this error, you can check for spelling errors and ensure all necessary libraries or modules are included, and declare any missing functions or variables. Both missing modules and libraries can cause this error, which is different from a syntax error that violates the rules of the Fortran language.
  • #1
Dreyliciouss
1
0
27 Jul 10 2:35
Hello,
I have an error when I try to execute my python program which uses a fortran subroutine (which call date_and_time function) :
"undefined symbol: G77_date_and_time_0"

Do you know how can I fix this issue?
Thank you very much!
 
Technology news on Phys.org
  • #2
It looks like a compiler error. Are you trying to force a g95 compile that uses g77 calls? It seems like it may be a compiler-specific function that is causing the problem.
 

Related to How to Fix 'Undefined Symbol: G77_date_and_time_0' Error in Fortran Subroutine?

1. What does the error message "Fortran undefined symbol f90" mean?

The error message "Fortran undefined symbol f90" means that the code is trying to use a function or variable that has not been defined or declared in the program. This can happen when the function or variable is misspelled or when the program is missing a necessary library or module.

2. How do I fix the "Fortran undefined symbol f90" error?

To fix the "Fortran undefined symbol f90" error, you can check for any spelling errors in the code and make sure that all necessary libraries or modules are included. If the error persists, you may need to declare the missing function or variable in the program.

3. Can a missing module cause the "Fortran undefined symbol f90" error?

Yes, a missing module can cause the "Fortran undefined symbol f90" error. If the program is trying to use a function or variable from a module that has not been included, the compiler will not be able to find the symbol and will throw the error.

4. What is the difference between an undefined symbol and a syntax error in Fortran?

An undefined symbol error means that the program is trying to use a function or variable that has not been defined or declared. A syntax error, on the other hand, means that the code violates the rules of the Fortran language and cannot be compiled. Both types of errors can prevent the program from running successfully.

5. Can a missing library cause the "Fortran undefined symbol f90" error?

Yes, a missing library can cause the "Fortran undefined symbol f90" error. If the program is trying to use a function or variable from a library that has not been included, the compiler will not be able to find the symbol and will throw the error.

Similar threads

Fortran Fortran subroutine solving for the velocity and displacement of a spring
    • Programming and Computer Science
Replies
8
Views
1K
Fortran Errors in Fortran code for solving Laplace's equation in 3D
    • Programming and Computer Science
Replies
4
Views
963
Fortran Fixing Fortran Runtime Error for Beginner
    • Programming and Computer Science
Replies
17
Views
5K
Fortran How does Fortran know the Inputs and Outputs of Subroutines
    • Programming and Computer Science
2
Replies
59
Views
9K
Fortran Fortran external functions vs subroutines
    • Programming and Computer Science
Replies
8
Views
3K
Python Best way to fix "externally managed environment" error?
    • Programming and Computer Science
Replies
1
Views
2K
Error in My Code: Undefined Symbols for x86_64
    • Programming and Computer Science
Replies
5
Views
1K
Comp Sci Can‘t call a subroutine name in a subroutine in Fortran90
    • Engineering and Comp Sci Homework Help
Replies
7
Views
1K
Fortran Help with Debugging Fortran Code | Plato Compiler
    • Programming and Computer Science
Replies
4
Views
2K
DEC runtime library for Fortran in Visual studio 2022
    • Computing and Technology
Replies
11
Views
433

Hot Threads

Recent Insights

Back
Top