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Message-ID: <0b57ff14-2d62-4b96-8f1f-b6bd3fbf686f@8pawexpress.com>
Date: 2025-04-22T14:21:25Z
From: biii+rsigm@c m@iii@g oii 8p@wexpress@com
Subject: openmp and xcode

If the CRAN R installation for macos includes |libomp.dylib|, is there a 
reason it does not include the paired |./include/omp*.h| files as well? 
It?s just three, they?re small, and it seems a reasonable step to making 
building packages that use OpenMP more direct.

Background: I?ve been having some difficulty compiling |data.table| 
(dev) on my MBP (M4, 15.4.1, R-4.4.3), due to an error (I do not assume 
it?s this package, I?ve had trouble with other packages too).

|symbol not found in flat namespace &#x27;___kmpc_dispatch_deinit&#x27; |

When troubleshooting this, I?ve verified that I have Xcode, but it is 
version 16.3, well past the 14.3 used for R-4.4.3. Sleuthing some more, 
I realized that it?s an easy mistake to update the 
|/usr/local/lib/libomp.dylib| file to be a different version than what 
is distributed in CRAN?s R. I don?t see an easy way to change version 
within XCode, and when I tried installing XCode-14.3 it says my OS does 
not support that (old) version. (Even with gfortran 12.2, I can?t fix 
that error, but that?s a different subject.)

I recognize the challenge in distributing binaries for multiple versions 
of macos and xcode. I believe R-4.5 is still being built on XCode-14.3, 
which begs another question of if/when XCode updates are planned for R 
binaries and CRAN. (Big topic, I understand, I did not find a recent 
discussion. My apologies if I missed something.)

Thanks,
Bill

&#8203;
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