[PATCH 3/3] Improve -Wmissing-indentation heuristics

[Jeff Law]

On 06/09/2015 11:31 AM, Patrick Palka wrote:
> This patch improves the heuristics of the warning in a number of ways.
> The improvements are hopefully adequately documented in the code
> comments.
>
> The additions to the test case also highlight the improvements.
>
> I tested an earlier version of this patch on more than a dozen C code
> bases.  I only found one class of bogus warnings yet emitted, in the
> libpng and bdwgc projects.  These projects have a coding style which
> indents code inside #ifdefs as if this code was guarded by an if(), e.g.
>
>    if (foo != 0)
>      x = 10;
>    else       // GUARD
>      y = 100; // BODY
>
>    #ifdef BAR
>      blah ();  // NEXT
>    #endif
>
> These bogus warnings are pre-existing, however (i.e. not caused by this
> patch).
>
> gcc/c-family/ChangeLog:
>
> 	* c-indentation.c (should_warn_for_misleading_indentation):
> 	Improve heuristics.
>
> gcc/testsuite/ChangeLog:
>
> 	* c-c++-common/Wmisleading-indentation.c: Add more tests.
OK after confirming a successful bootstrap & regression test.

jeff