Suppress warnings reported by -Wstrict-prototypes

A function declaration without a prototype is deprecated in all versions
of C.

src/elf.c

@@ -67,7 +67,7 @@ struct elf_internal {
 #define min(a, b) ((a) < (b) ? (a) : (b))
 #endif
 
-elf_t *elf_new()
+elf_t *elf_new(void)
 {
     elf_t *e = malloc(sizeof(elf_t));
     e->hdr = NULL;

src/elf.h

@@ -129,7 +129,7 @@ struct Elf32_Sym {
 
 typedef struct elf_internal elf_t;
 
-elf_t *elf_new();
+elf_t *elf_new(void);
 void elf_delete(elf_t *e);
 
 /* Open an ELF file from specified path */

src/io.c

@@ -28,7 +28,7 @@ static uint8_t *data_memory_base;
  */
 #define MEM_SIZE 0xFFFFFFFFULL
 
-memory_t *memory_new()
+memory_t *memory_new(void)
 {
     memory_t *mem = malloc(sizeof(memory_t));
 #if HAVE_MMAP

src/io.h

@@ -17,7 +17,7 @@ typedef struct {
     uint64_t mem_size;
 } memory_t;
 
-memory_t *memory_new();
+memory_t *memory_new(void);
 void memory_delete(memory_t *m);
 
 /* read a C-style string from memory */

src/state.h

@@ -22,7 +22,7 @@ typedef struct {
     map_t fd_map;
 } state_t;
 
-static inline state_t *state_new()
+static inline state_t *state_new(void)
 {
     state_t *s = malloc(sizeof(state_t));
     s->mem = memory_new();

src/syscall_sdl.c

@@ -719,7 +719,7 @@ static void set_music_volume(riscv_t *rv)
     Mix_VolumeMusic(volume * 8);
 }
 
-static void init_audio()
+static void init_audio(void)
 {
     if (!(SDL_WasInit(-1) & SDL_INIT_AUDIO)) {
         if (SDL_Init(SDL_INIT_AUDIO) != 0) {

tests/map/mt19937.c

@@ -17,23 +17,21 @@ void mt19937_init(uint64_t seed)
     }
 }
 
-static void generate_numbers()
+static void generate_numbers(void)
 {
     for (int i = 0; i < 624; i++) {
         uint64_t y =
             (MT[i] & 0x80000000ULL) + (MT[(i + 1) % 624] & 0x7fffffffULL);
         MT[i] = MT[(i + 397) % 624] ^ (y >> 1);
-        if (y % 2 != 0) {
+        if (y % 2 != 0)
             MT[i] = MT[i] ^ 0x9908b0dfULL;
-        }
     }
 }
 
-uint64_t mt19937_extract()
+uint64_t mt19937_extract(void)
 {
-    if (index == 0) {
+    if (index == 0)
         generate_numbers();
-    }
 
     uint64_t y = MT[index];
     y = y ^ (y >> 11);

tests/map/mt19937.h

@@ -17,4 +17,4 @@
 void mt19937_init(uint64_t seed);
 
 /* Generate and extract a 32-bit random number */
-uint64_t mt19937_extract();
+uint64_t mt19937_extract(void);

tests/map/test-map.c

@@ -17,7 +17,7 @@ static void swap(int *x, int *y)
 enum { N_NODES = 10000 };
 
 /* return 0 on success; non-zero values on failure */
-static int test_map_mixed_operations()
+static int test_map_mixed_operations(void)
 {
     int ret = 0;
     map_t tree = map_init(int, int, map_cmp_int);

tests/path/test-path.c

@@ -21,7 +21,7 @@ void compare(char *input, char *expected_output)
     free(input_sanitized);
 }
 
-void sanitize_path_test()
+void sanitize_path_test(void)
 {
     /* Already clean */
     compare("", ".");
@@ -71,7 +71,7 @@ void sanitize_path_test()
     compare("abc/../../././../def", "../../def");
 }
 
-int main()
+int main(void)
 {
     sanitize_path_test();
 

tools/rv_histogram.c

@@ -60,7 +60,7 @@ static int cmp_asc(const void *a, const void *b)
 }
 
 /* used to adjust the length of histogram bar */
-static unsigned short get_win_max_col()
+static unsigned short get_win_max_col(void)
 {
 #if defined(_WIN32)
     CONSOLE_SCREEN_BUFFER_INFO csbi;
@@ -84,7 +84,7 @@ static void find_max_freq(const rv_hist_t *stats, size_t stats_size)
 static const char *fmt = "%3d. %-10s%5.2f%% [%-10zu] %s\n";
 
 /* get columns used by the fmt string */
-static unsigned short get_used_col()
+static unsigned short get_used_col(void)
 {
     unsigned short used_col = 0;