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[PATCH, testsuite]: Test compat _Complex varargs passing

On Mon, Sep 5, 2016 at 1:45 PM, Joseph Myers <> wrote:
> On Sun, 4 Sep 2016, Uros Bizjak wrote:
>> It looks that different handling of _Complex char, _Complex short and
>> _Complex float is there on purpose. Is (was?) there a limitation in a
>> c language standard that prevents passing of these arguments as
>> varargs?
> Well, ISO C doesn't define complex integers at all.  But it's deliberate
> (see DR#206) that _Complex float doesn't promote to _Complex double in
> variable arguments.  And there is nothing in ISO C to stop _Complex float
> being passed in variable arguments.
> For all these types including the complex integer ones: given that the
> front end doesn't promote them, they should be usable in variable
> arguments.

Attached patch adds various _Complex variable arguments tests to
scalar-by-value-4 and scalar-return-4 tests. These tests previously
erroneously claimed that these argument types are unsupported as
variable arguments.

2016-09-08  Uros Bizjak  <>

    * gcc.dg/compat/scalar-by-value-4_x.c: Also test passing of
    variable arguments.
    * gcc.dg/compat/scalar-by-value-4_y.c (testva##NAME): New.
    * gcc.dg/compat/scalar-by-value-4_main.c: Update description comment.
    * gcc.dg/compat/scalar-return-4_x.c: Also test returning of
    variable argument.
    * gcc.dg/compat/scalar-return-4_y.c (testva##NAME): New.
    * gcc.dg/compat/scalar-return-4_main.c: Update description comment.

Tested on x86_64-linux-gnu {,-m32}.

OK for mainline?


Attachment: t.diff.txt
Description: Text document

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