Re: No distinction between COMPLEX and CMPLX in gfortran

Hey Andrew and Paul,

Thanks for the quick response and pointing to the extensions. I overlooked
the GCC extensions part. Thanks for explaining further and sharing the
links.

Naveen Yadav





On Tue, Dec 30, 2025 at 2:42 PM Paul Richard Thomas <
[email protected]> wrote:

> Hi Andrew and Naveen,
>
> pault@fedora:~/prs/pdt$ gfortran ../complex.f90 -std=f2018
> ../complex.f90:6:6:
>
>     6 |   z = COMPLEX(1.0,2.0)
>       |      1
> Error: Function ‘complex’ at (1) has no IMPLICIT type
> ../complex.f90:9:6:
>
>     9 |   z = COMPLEX(a, b)
>       |      1
> Error: Function ‘complex’ at (1) has no IMPLICIT type
>
> The result is the same with -std=f95.
>
> Regards
>
> Paul
>
>
> On Tue, 30 Dec 2025 at 07:00, Andrew Pinski <
> [email protected]> wrote:
>
>> On Mon, Dec 29, 2025 at 10:50 PM Naveen Yadav via Gcc <[email protected]>
>> wrote:
>> >
>> > Dear developers,
>> >
>> > I am using  GNU Fortran (GCC) 15.2.1 20251211 (Red Hat 15.2.1-5):
>> >
>> > The following program:
>> >
>> >
>> ****************************************************************************************************
>> > PROGRAM test
>> > IMPLICIT NONE
>> > REAL :: a = 1.0, b=1.0
>> > COMPLEX:: z
>> >
>> > z = COMPLEX(1.0,2.0)
>> > PRINT*, z
>> >
>> > z = COMPLEX(a, b)
>> > PRINT*, z
>> >
>> > END PROGRAM test
>> >
>> ****************************************************************************************************
>> >
>> > works with gfortran. However, the Intel compiler (from oneApi) throws a
>> > compile error:
>> >
>> > test.f90(6): error #6404: This name does not have a type, and must have
>> an
>> > explicit type.   [COMPLEX]
>> > z = COMPLEX(1.0,2.0)
>> > ----^
>> > compilation aborted for test.f90 (code 1)
>> >
>> > It is because COMPLEX is the name of a type and CMPLX is an intrinsic
>> > function. The behaviour of the Intel compiler is the correct one. I hope
>> > this will be updated in a future release.
>>
>> See
>> https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gfortran/COMPLEX.html#index-COMPLEX
>> ```
>> Standard:
>> GNU extension
>> ```
>>
>> Thanks,
>> Andrew
>>
>> >
>> > Best regards
>> > Naveen Yadav
>>
>