> On 14/12/2025, at 11:24 AM, Jeroen Ooms <[email protected]> wrote:
>
> On Fri, Dec 12, 2025 at 3:20 AM Simon Urbanek
> <[email protected]> wrote:
>
>> The goal is to remove the existing big-sur-arm64 R-devel binaries in favor
>> of the sonoma-arm64 R-devel build. Since we are still far away from the
>> R-devel release, all this is considered experimental and may change in the
>> future (possibly Fortran upgrade is in the cards), but given that this is
>> not a minor change, I want to give others the opportunity to test the new
>> setup and comment as appropriate.
>
> Thanks. Some quick observations:
>
> The x86_64 build of r-devel on https://mac.r-project.org/ is almost 2 months
> old?
>
Should be fixed now.
> On arm64, using the latest R-devel-arm64.pkg on a machine with macOS 15 and
> Xcode_16.2, I get the following error for all packages with compiled C code:
>
> error: invalid value 'gnu23' in '-std=gnu23'
> note: use 'c2x' for 'Working Draft for ISO C2x' standard
> note: use 'gnu2x' for 'Working Draft for ISO C2x with GNU extensions'
> standard
>
That is expected, you'll need at least Xcode 16.3 since 16.2 is LLVM 17 while
16.3 is LLVM 19 which, as has been discussed at length, was a big breaking
jump. As noted, what is actually used is Xcode 26.x so that would be
recommended (albeit not required).
It does raise an interesting point, though: macOS 15 is not an issue since you
can install all the way to Xcode 26.3 without problems, but macOS 14 (which is
our designed target) only runs Xcode 16.2. However, the whole point of moving
the target forward was that we upgrade from Xcode 16.2 since that's what we
used for the Big Sur build, so sticking with it would defeat the whole purpose.
So, would anyone be unhappy if we simply declared macOS 14 as the run-time
target, but development needs macOS 15 for the compiler support? It's not
ideal, but the only other way would be to deliberately disable C23 support -
it's doable, though.
Cheers,
Simon
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