[enhancement] clang-modernize should support converting K&R parameter definitions into C prototypes

[Quuxplusone]

Bugzilla Link	PR18857
Status	NEW
Importance	P enhancement
Reported by	James Widman (james.widman@gmail.com)
Reported on	2014-02-16 00:51:47 -0800
Last modified on	2020-08-20 03:19:25 -0700
Version	unspecified
Hardware	All All
CC	alexfh@google.com, ascottcameron@gmail.com, djasper@google.com, edwin.vane@intel.com, eugene.zelenko@gmail.com, klimek@google.com, legalize@xmission.com
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Example: convert:

/* a.h: */
void f();

struct A { int m; };

/* a.c: */
void f(x,p)
    int x;
    struct A *p;
{

}

.... to:

/* a.h: */
struct A;
void f( int x, struct A *p );

struct A { int m; };

/* a.c: */
void f( int x, struct A *p );
{

}

Notice that clang-modernize would have to insert a forward-declaration of
struct A before the first use of "ptr-to-A" as a function parameter.
(Otherwise, the type would belong to the scope of function parameters.)

[Quuxplusone]

Clang-modernize is deprecated in favour of Clang-tidy modernize module.

GCC had (or still has) protoize which fix function declarations.

[Quuxplusone]

_Bug 26466 has been marked as a duplicate of this bug._