How do I link object files in C? Fails with “Undefined symbols for architecture x86_64”

by

I assume you are using gcc, to simply link object files do:

$ gcc -o output file1.o file2.o

To get the object-files simply compile using

$ gcc -c file1.c

this yields file1.o and so on.

If you want to link your files to an executable do

$ gcc -o output file1.c file2.c

Related Contents:

  1. Determining C executable name
  2. What is -ffreestanding option in gcc?
  3. How are char arrays / strings stored in binary files?
  4. Removing trailing newline character from fgets() input
  5. Using GCC to produce readable assembly?
  6. Why does GCC use multiplication by a strange number in implementing integer division?
  7. Is errno thread-safe?
  8. Warning/error “function declaration isn’t a prototype”
  9. What is the use of _start() in C?
  10. Bubble sort slower with -O3 than -O2 with GCC
  11. Why is a simple loop optimized when the limit is 959 but not 960?
  12. How many GCC optimization levels are there?
  13. How do I fix “for loop initial declaration used outside C99 mode” GCC error?
  14. Is gcc C compiler written in C itself?
  15. Trying to understand gcc option -fomit-frame-pointer
  16. The difference between asm, asm volatile and clobbering memory
  17. Why is the compiler throwing this warning: “missing initializer”? Isn’t the structure initialized?
  18. Why does GCC pad functions with NOPs?
  19. How to turn off gcc compiler optimization to enable buffer overflow
  20. What is C17 and what changes have been made to the language?
  21. What is the default C -std standard version for the current GCC (especially on Ubuntu)?
  22. How to compile executable for Windows with GCC with Linux Subsystem?
  23. Is there a 128 bit integer in gcc?
  24. Floating point exception ( SIGFPE ) on ‘int main(){ return(0); }’
  25. Printf long long int in C with GCC?
  26. How does this C program compile and run with two main functions?
  27. How to add a builtin function in a GCC plugin?
  28. how to print __uint128_t number using gcc?
  29. Anonymous functions using GCC statement expressions
  30. What is “!!” in C? [duplicate]
  31. GCC’s assembly output of an empty program on x86, win32
  32. How to circumvent format-truncation warning in GCC?
  33. Anonymous union within struct not in c99?
  34. Maximum size of size_t
  35. What is the difference between str==NULL and str[0]==’\0′ in C?
  36. What causes a char to be signed or unsigned when using gcc?
  37. Why does GCC create a shared object instead of an executable binary according to file?
  38. How do I execute a file in Cygwin?
  39. What is “…” in switch-case in C code
  40. difference between and
  41. C preprocessor: expand macro in a #warning
  42. Stack allocation, padding, and alignment
  43. Reading a register value into a C variable [duplicate]
  44. Is it a good idea to compile a language to C?
  45. Query on -ffunction-section & -fdata-sections options of gcc
  46. use RPATH but not RUNPATH?
  47. Expressions “j = ++(i | i); and j = ++(i & i); should be a lvalue error?
  48. Location of C standard library
  49. Detecting 64bit compile in C
  50. Why does passing char** as const char** generate a warning?

Leave a Comment