How Can I Change the Stack Size of a C Application in Linux Using GCC?

Changing Stack Size for C Applications in Linux with GCC

In Linux, unlike macOS, the LD_FLAGS=-Wl,-stack_size option is not recognized by the GNU compiler. To adjust stack size for a single C application, the setrlimit function can be utilized programmatically.

#include <sys/resource.h>

int main() {
  const rlim_t kStackSize = 16 * 1024 * 1024;  // 16 MB

  struct rlimit rl;
  int result;

  // Get current stack size limits
  result = getrlimit(RLIMIT_STACK, &rl);
  if (result == 0) {
    // If current stack size is less than desired, adjust it
    if (rl.rlim_cur < kStackSize) {
      rl.rlim_cur = kStackSize;
      result = setrlimit(RLIMIT_STACK, &rl);
      if (result != 0) {
        // Error handling
      }
    }
  }

  // Your code...

  return 0;
}

When implementing this solution, it's crucial to place large local variable declarations within functions that are called from main() rather than directly in main(). Otherwise, a stack overflow may occur before the stack size can be augmented.

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