#858 Using "Field=1" in a composed type induces structure error when compiling with gcc 32-bit & 64-bit

[fxm (freebasic.net)]

When using "Field=1" in a composed type, that induces an error in the main structure packing when compiling with gcc 32-bit and 64-bit (the same code works when compiling with gas).

Example of bug with gcc 32-bit and gcc 64-bit:

type t12byte field=1
  as longint a
  as long b
end type

type t16byte
    as t12byte a
end type

print sizeof(t12byte)
print sizeof(t16byte)

dim dummy as t16byte

Compilation error:

Compiler output:
.....\FBIDETEMP.c:15:47: error: size of array '__$fb_structsizecheck' is negative
#define __FB_STATIC_ASSERT( expr ) extern int __$fb_structsizecheck

.....\FBIDETEMP.c:20:1: note: in expansion of macro '__FB_STATIC_ASSERT'
__FB_STATIC_ASSERT( sizeof( struct $7T16BYTE ) == 16 );

Results:
Compilation failed

[fxm (freebasic.net)]

A workaround to the above gcc bug (32-bit and 64-bit):

type t12byte field=1
  as longint a
  as long b
end type

type t16byte
  union
    as t12byte a
    as longint dummy
  end union
end type

print sizeof(t12byte)
print sizeof(t16byte)

dim dummy as t16byte

sleep

[dkl]

Should be fixed by [4e2d70]
https://github.com/freebasic/fbc/pull/110