GDC2 compilation warnings

[bearophile]

While compiling GDC2 today I have seen hundreds of warnings, usually one of 5 types:


../../gcc/d/d-gcc-real.h: In member function ‘const real_value& real_t::rv() const’:
../../gcc/d/d-gcc-real.h:54: warning: dereferencing type-punned pointer will break strict-aliasing rules



In file included from ../../gcc/d/d-builtins.c:72:
../../gcc/d/d-bi-attrs-44.h: In function ‘handle_packed_attribute’:
../../gcc/d/d-bi-attrs-44.h:211: warning: unknown conversion type character ‘E’ in format
../../gcc/d/d-bi-attrs-44.h:211: warning: too many arguments for format



../../gcc/d/dmd2/builtin.c: In member function ‘BUILTIN FuncDeclaration::isBuiltin()’:
../../gcc/d/dmd2/builtin.c:44: warning: unused variable ‘FeZe’
../../gcc/d/dmd2/builtin.c:45: warning: unused variable ‘FeZe2’



../../gcc/d/dmd2/toobj.c: In member function ‘virtual void ClassDeclaration::toObjFile(int)’:
../../gcc/d/dmd2/toobj.c:691: warning: comparison between signed and unsigned integer expressions
../../gcc/d/dmd2/toobj.c:693: warning: comparison between signed and unsigned integer expressions



In file included from ../../gcc/d/dmd2/root.h:29,
                 from ../../gcc/d/dmd2/total.h:24,
                 from ../../gcc/d/d-cppmngl.cc:25:
../../gcc/d/dmd2/dchar.h:155: warning: unused parameter ‘pstart’


Comments:
- Unused variable warning: this is useful to avoid bugs;
- Type-punned pointer warning: so far I have never received an answer to my questions about this possible problem in D.
- Printing functions wrong argument number warning: this is something D needs to add, for writef, writefln, printf, sprintf, etc (even if it can't work in all situations). Having those as run-time errors is silly in a language that unlike dynamic languages forces you to compile the code. This is an example of dynamic typing where I don't want it.
- Signed unsigned comparison warning: unless D invents some other very good solution, this warning is a ugly but necessary patch over one hole of the C language that D too has.

Bye,
bearophile