Fix fmt for StatEntity for latest fmt versions

fmt version 9 has introduced new customization points that break Gaudi (see #239 and https://github.com/key4hep/Gaudi/issues/1). Taking the proposed patch for this and adding a version guard around it, to not break with fmt version 8.

assigned to @clemenci

added lhcb-gaudi-head label

changed milestone to %v36r10

Thanks a lot for the fix.

I cannot really test it on fmt 9 at the moment, so I'll merge it if it does not break our current builds.

I built it successfully against fmt 9.1.0, but I most likely have not used a configuration that builds everything, if there is a sort of standard config (that is not the default cmake arguments), let me know, and I can try and build with that again.

• [2023-01-11 00:13] Validation started with lhcb-gaudi-head#3443
• [2023-01-11 00:36] Validation started with lhcb-run2-gaudi-head#437
• [2023-01-12 00:03] Validation started with lhcb-gaudi-head#3444
• [2023-01-12 00:27] Validation started with lhcb-run2-gaudi-head#438
• [2023-01-13 00:02] Validation started with lhcb-gaudi-head#3445
• [2023-01-13 00:16] Validation started with lhcb-run2-gaudi-head#439
• [2023-01-14 00:03] Validation started with lhcb-gaudi-head#3446
• [2023-01-14 00:24] Validation started with lhcb-run2-gaudi-head#440
• [2023-01-15 00:02] Validation started with lhcb-gaudi-head#3447
• [2023-01-17 00:03] Validation started with lhcb-gaudi-head#3448
• [2023-01-17 00:11] Validation started with lhcb-run2-gaudi-head#441
• [2023-01-18 00:03] Validation started with lhcb-gaudi-head#3449
• [2023-01-19 00:02] Validation started with lhcb-gaudi-head#3450
• [2023-01-20 00:03] Validation started with lhcb-gaudi-head#3451
• [2023-01-21 00:03] Validation started with lhcb-gaudi-head#3452
• [2023-01-21 00:23] Validation started with lhcb-run2-gaudi-head#442
• [2023-01-23 00:03] Validation started with lhcb-gaudi-head#3453
• [2023-01-24 00:04] Validation started with lhcb-gaudi-head#3454
• [2023-01-24 00:13] Validation started with lhcb-run2-gaudi-head#443
• [2023-01-25 00:03] Validation started with lhcb-gaudi-head#3455
• [2023-01-25 00:11] Validation started with lhcb-run2-gaudi-head#444
• [2023-01-26 00:04] Validation started with lhcb-gaudi-head#3456
• [2023-01-26 00:16] Validation started with lhcb-run2-gaudi-head#445

approved this merge request

mentioned in commit 13f08003

merged

mentioned in issue #268 (closed)