[llvm-bugs] [Bug 42515] New: QMap C++ initializer list slow

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42515

            Bug ID: 42515
           Summary: QMap C++ initializer list slow
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: matthias at opengis.ch
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Compiling QMap with large initializer lists (a couple of 100 entries) takes
very long.

For a code example see here:

https://github.com/qgis/QGIS/blob/master/src/core/qgscoordinatereferencesystem_legacy.h#L23

With this discussion concerning build times on BSD
http://osgeo-org.1560.x6.nabble.com/QGIS-Developer-QGIS-3-8-0-on-FreeBSD-build-takes-several-hours-td5408676.html

An issue on Qt side (for MacOS) has been closed and an upstream bug recommended

https://bugreports.qt.io/browse/QTBUG-57672

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