C++20 fixes

Fix compilation with gcc13 / c++20 , ROOT 6.28.04 (LCG dev4), fmtlib 10.0.0

• use fmt::runtime where needed (with a hack to still work with fmtlib < 8)
• avoid implicit capture of this in lambdas via [=]
• fix comparison between Gaudi::Property<std::string> and const char*
• hide std::source_location to cling

Closes #266 (closed)

added 5 commits

• 309028c8 - HistogramArray: use fmt:runtime
• fe8943ac - genconf: use fmt::runtime
• e3b5d4aa - MessageSvcSink: use fmt::runtime
• 540d8aa8 - multiple: switch operands in operator== because it didn't exist the other way around
• cc8c3950 - MessageSvcSink: this fails to compile

Compare with previous version

added 10 commits

• 38ea1b8b - PluginService: root clang does has source_location in experimental
• 437797b9 - ChronoEntity: these need to be constepxr
• 3154a4cf - KeyedObjectManager: no template thing in the d'tor
• bba2e606 - Allocator: fix 'template-id not allowed for destructor'
• 3b9e8b95 - Catalog: wrong fmt use??? (no idea but it compiles now...)
• e4b72a41 - HistogramArray: use fmt:runtime
• 5bbe9155 - genconf: use fmt::runtime
• 3d683ffb - MessageSvcSink: use fmt::runtime
• e33b9ad5 - multiple: switch operands in operator== because it didn't exist the other way around
• f94abcdb - MessageSvcSink: this fails to compile

Compare with previous version

added 1 commit

• c8164149 - Fix custom formatter for JSON in MessageSvcSink

Compare with previous version

changed milestone to %v36r13

assigned to @clemenci

added 1 commit

• fd500e24 - fix warnings about 'this' captured in lambdas via [=]

Compare with previous version

added 1 commit

• a9a4cad9 - Fix compilation with fmtlib < 8

Compare with previous version

resolved all threads

mentioned in issue #268 (closed)

added lhcb-gaudi-head label

added lhcb-lcg-dev3lhcb lhcb-lcg-dev4lhcb labels

• [2023-06-02 00:03] Validation started with lhcb-gaudi-head#3582
• [2023-06-02 00:16] Validation started with lhcb-lcg-dev3lhcb#169
• [2023-06-02 00:17] Validation started with lhcb-lcg-dev4lhcb#169
• [2023-06-02 00:25] Validation started with lhcb-run2-gaudi-head#538

approved this merge request

changed title from C++20 fixes for #266 to C++20 fixes

changed the description