[C][emscripten]sizeof number types

sizeof.c

// clang -Wall -Wextra -std=c11 sizeof.c -o sizeof
// emcc -Wall -Wextra -std=c11 sizeof.c -o sizeof.js

#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>

#include <stdio.h>
#include <wchar.h>
#include <time.h>
#include <setjmp.h>
#include <locale.h>

// C99
#include <stdbool.h>
#include <inttypes.h>
#include <complex.h>
#include <fenv.h>

// C11
#include <stdalign.h>
//#include <threads.h>


#define show_size(type) printf(\
  "sizeof (" #type ") = %zu, alignof (" #type ") == %zu\n", \
  sizeof (type), alignof(type))

int main(int argc, char* argv[])
{
  (void) argc, (void) argv;
  // basic number type
  show_size(char);
  show_size(short);
  show_size(int);
  show_size(long);
  show_size(long long);
  show_size(float);
  show_size(double);
  show_size(long double);
  // other num types
  show_size(size_t);
  show_size(ptrdiff_t);
  show_size(wchar_t);
  show_size(wint_t);
  // libc types
  show_size(div_t);
  //show_size(FILE); // only "typedef struct _IO_FILE FILE;" in emscripten libc
  show_size(fpos_t);
  show_size(time_t);
  show_size(clock_t);
  show_size(struct tm);
  show_size(va_list);
  show_size(mbstate_t);
  show_size(jmp_buf);
  show_size(struct lconv);
  
  // C99 types
  show_size(bool);
  show_size(intmax_t);
  show_size(uintptr_t);
  show_size(float complex);
  show_size(double complex);
  show_size(long double complex);
  show_size(fenv_t);
  show_size(fexcept_t);
  
  return 0;
}

sizeof_numtypes_in_emscripten.txt

$ emcc -Wall -Wextra -std=c11 sizeof.c -o sizeof.js
$ iojs sizeof.js
sizeof (char) = 1, alignof (char) == 1
sizeof (short) = 2, alignof (short) == 2
sizeof (int) = 4, alignof (int) == 4
sizeof (long) = 4, alignof (long) == 4
sizeof (long long) = 8, alignof (long long) == 8
sizeof (float) = 4, alignof (float) == 4
sizeof (double) = 8, alignof (double) == 8
sizeof (long double) = 8, alignof (long double) == 8
sizeof (size_t) = 4, alignof (size_t) == 4
sizeof (ptrdiff_t) = 4, alignof (ptrdiff_t) == 4
sizeof (wchar_t) = 4, alignof (wchar_t) == 4
sizeof (wint_t) = 4, alignof (wint_t) == 4
sizeof (div_t) = 8, alignof (div_t) == 4
sizeof (fpos_t) = 16, alignof (fpos_t) == 8
sizeof (time_t) = 4, alignof (time_t) == 4
sizeof (clock_t) = 4, alignof (clock_t) == 4
sizeof (struct tm) = 44, alignof (struct tm) == 4
sizeof (va_list) = 16, alignof (va_list) == 4
sizeof (mbstate_t) = 8, alignof (mbstate_t) == 4
sizeof (jmp_buf) = 156, alignof (jmp_buf) == 4
sizeof (struct lconv) = 56, alignof (struct lconv) == 4
sizeof (bool) = 1, alignof (bool) == 1
sizeof (intmax_t) = 8, alignof (intmax_t) == 8
sizeof (uintptr_t) = 4, alignof (uintptr_t) == 4
sizeof (float complex) = 8, alignof (float complex) == 4
sizeof (double complex) = 16, alignof (double complex) == 8
sizeof (long double complex) = 16, alignof (long double complex) == 8
sizeof (fenv_t) = 32, alignof (fenv_t) == 4
sizeof (fexcept_t) = 2, alignof (fexcept_t) == 2

sizeof_numtypes_in_osx_amd64.txt

$ clang -Wall -Wextra -std=c11 sizeof.c -o sizeof
$ ./sizeof
sizeof (char) = 1, alignof (char) == 1
sizeof (short) = 2, alignof (short) == 2
sizeof (int) = 4, alignof (int) == 4
sizeof (long) = 8, alignof (long) == 8
sizeof (long long) = 8, alignof (long long) == 8
sizeof (float) = 4, alignof (float) == 4
sizeof (double) = 8, alignof (double) == 8
sizeof (long double) = 16, alignof (long double) == 16
sizeof (size_t) = 8, alignof (size_t) == 8
sizeof (ptrdiff_t) = 8, alignof (ptrdiff_t) == 8
sizeof (wchar_t) = 4, alignof (wchar_t) == 4
sizeof (wint_t) = 4, alignof (wint_t) == 4
sizeof (div_t) = 8, alignof (div_t) == 4
sizeof (fpos_t) = 8, alignof (fpos_t) == 8
sizeof (time_t) = 8, alignof (time_t) == 8
sizeof (clock_t) = 8, alignof (clock_t) == 8
sizeof (struct tm) = 56, alignof (struct tm) == 8
sizeof (va_list) = 24, alignof (va_list) == 8
sizeof (mbstate_t) = 128, alignof (mbstate_t) == 8
sizeof (jmp_buf) = 148, alignof (jmp_buf) == 4
sizeof (struct lconv) = 96, alignof (struct lconv) == 8
sizeof (bool) = 1, alignof (bool) == 1
sizeof (intmax_t) = 8, alignof (intmax_t) == 8
sizeof (uintptr_t) = 8, alignof (uintptr_t) == 8
sizeof (float complex) = 8, alignof (float complex) == 4
sizeof (double complex) = 16, alignof (double complex) == 8
sizeof (long double complex) = 32, alignof (long double complex) == 16
sizeof (fenv_t) = 16, alignof (fenv_t) == 4
sizeof (fexcept_t) = 2, alignof (fexcept_t) == 2