Dear all,

I've committed an obvious fix for the testcase to avoid recursive I/O,
as it did cause a hang on some systems:

https://gcc.gnu.org/g:36a4ee406b95ae24a59b8b3f8ebe29af6fd5261e

Confirmed by Jerry that this resolves his issue.
See also attached.

Thanks,
Harald

Am 29.11.22 um 09:08 schrieb Paul Richard Thomas via Gcc-patches:
> Hi Harald,
>
> It looks good to me.
>
> Thanks to you and Steve for the patch.
>
> Paul
>
>
> On Mon, 28 Nov 2022 at 20:05, Harald Anlauf via Fortran <fortran@gcc.gnu.org>
> wrote:
>
>> Dear all,
>>
>> as reported, the Fortran standard requires all actual argument
>> expressions to be evaluated (e.g. F2018:15.5.3).
>>
>> There were two cases for intrinsic MERGE where we failed to do so:
>>
>> - non-constant mask; Steve provided the patch
>>
>> - constant scalar mask; we need to be careful to simplify only if
>>    the argument on the "other" path is known to be constant so that
>>    it does not have side-effects and can be immediately removed.
>>
>> The latter change needed a correction of a sub-test of testcase
>> merge_init_expr_2.f90, which should not have been simplified
>> the way the original author assumed.  I decided to modify the
>> test in such way that simplification is valid and provides
>> the expect pattern.
>>
>> Regtested on x86_64-pc-linux-gnu.  OK for mainline?
>>
>> Thanks,
>> Harald
>>
>
>