Is an empty initializer list valid C code?

by

No, an empty initializer list is not allowed. This can also be shown by GCC when compiling with -std=c99 -pedantic:

a.c:4: warning: ISO C forbids empty initializer braces

The reason is the way the grammar is defined in §6.7.9 of the 2011 ISO C Standard:

initializer:
         assignment-expression
         { initializer-list }
         { initializer-list , }
initializer-list:
         designation(opt) initializer
         initializer-list , designation(opt) initializer

According to that definition, an initializer-list must contain at least one initializer.

More Related Contents:

  1. Are compound statements (blocks) surrounded by parens expressions in ANSI C?
  2. What is a designated initializer in C?
  3. Why doesn’t GCC optimize structs?
  4. Bitshift and integer promotion?
  5. Anonymous union within struct not in c99?
  6. Standard C library in mingW
  7. Array of size 0 at the end of struct [duplicate]
  8. Does GCC’s __attribute__((__packed__)) retain the original ordering?
  9. Why both clang and gcc only give a warning when there is a space after backslash if C standard says that whitespace is forbidden?
  10. Why does static initialization of flexible array member work?
  11. Integer overflow in C: standards and compilers
  12. Assembly code fsqrt and fmul instructions
  13. Running C — helloWorld runs but nothing else — Ubuntu
  14. Why does the order of ‘-l’ option in gcc matter? [duplicate]
  15. Hide password input on terminal
  16. How can I tell gcc not to inline a function?
  17. how to print __uint128_t number using gcc?
  18. Merge multiple .so shared libraries
  19. Realistic usage of the C99 ‘restrict’ keyword?
  20. Get the start and end address of text section in an executable
  21. Overriding C library functions, calling original
  22. Initializing a struct to 0
  23. why does GCC __builtin_prefetch not improve performance?
  24. Does pthread_mutex_lock contains memory fence instruction? [duplicate]
  25. what “inline __attribute__((always_inline))” means in the function?
  26. Are constant C expressions evaluated at compile time or at runtime?
  27. The difference between asm, asm volatile and clobbering memory
  28. Is there a way to get warned about unused functions?
  29. Getting started with Intel x86 SSE SIMD instructions
  30. How do I compile the asm generated by GCC?

Leave a Comment