#936 initializing type containing anonymous union can cause gcc warning

[Jeff Marshall]

A type with a nested union appears to lose some information about where to put the initializing braces in the C emitter. Noticed this only on static initializers (shared. and no issue on gas/gas64 backends.

type T
    a as integer
    union
        b as integer
        c as byte
    end union
end type

dim shared x as const T = ( 1, (2) )
print x.c

/' gcc output
struct.c:23:24: warning: missing braces around initializer [-Wmissing-braces]
   23 | static struct $1T X$ = { 1, 2 };
      |                        ^
      |                             { }
'/

When the union is named, the gcc warning does not appear:

union U
    b as integer
    c as byte
end union

type T
    a as integer
    d as U
end type

dim shared x as const T = ( 1, (2) )
print x.d.c

[fxm (freebasic.net)]

Same problem with anonymous type:

union U
    type
        a as integer
        b as byte
    end type
    c as integer
end union

dim shared x as const U = ( 1, 2)
print x.a, x.b

[TeeEmCee]

This has been around for years. I know that GCC 9+ throws the warning, but don't know if GCC 8 does.