Widening bitfields for arguments

[Jakub Jelinek]

Hi!

struct foo
{
  unsigned int a:16;
};

void bar (unsigned int);

struct foo x;

void baz (void)
{
  bar (x.a);
}

gives a warning with -Wconversion unless -traditional:
passing arg 1 of `bar' as unsigned due to prototype
, but when I tried it on i386 and sparc64 without the
bar prototype, the value was passed zero extended, not
sign extended (unless a's type was changed to int). The
-Wconversion warning is emitted even for:

struct foo
{
  unsigned int a:16;
};

void bar (unsigned int);

struct foo x;

void baz (void)
{
  bar ((unsigned int)x.a);
}

where it definitely looks like a bug.

	Jakub