[build] user decides how to build

.cargo/config.toml

@@ -1,2 +0,0 @@
-[build]
-rustflags = ["-C", "target-cpu=native", "-C", "target-feature=+crt-static"]

c_version/clangtest

@@ -1,6 +1,6 @@
 #!/bin/bash
 set -e
 
-clang -Wall -Wextra -Weverything -Werror -O3 -march=native -flto -std=c17 -fstack-protector-all -s -o sudk_c "$1"
+clang -Weverything -Wno-unsafe-buffer-usage -Werror -O3 -march=native -flto -std=c17 -fstack-protector-all -s -o sudk_c "$1"
 
 time ./sudk_c

c_version/sudk_stack.c

@@ -5,7 +5,7 @@
 #include <stdlib.h>
 #include <sys/types.h>
 
-static inline void Print_Clear() { printf("\x1b\x5b\x48\x1b\x5b\x32\x4a"); }
+static inline void Print_Clear(void) { printf("\x1b\x5b\x48\x1b\x5b\x32\x4a"); }
 
 typedef struct Sudoku {
   uint8_t *field;
@@ -258,7 +258,7 @@ static void Sudoku_Free(Sudoku *s) {
   s = NULL;
 }
 
-int main() {
+int main(void) {
   Sudoku *s = Sudoku_New(3);
   Sudoku_Print(s);
   Sudoku_SolveBacktracking(s);