[Vala] Is the C code generated by valac compliant with C89, or C99?

[Jerry Tan <Jerry Tan Sun COM>]

Hi, all,

I know that I can use gcc or sunstudio to compile C code which is 
generated by valac,

I just want to know that is there any compiler dependency,
for example, gcc extension,  c99 support,
any requirement for gcc version or sunstudio version?