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riscv64 GCC 14 -> 15 C++ build time regression



Hi,

is it a known issue that with the change from GCC 14 to 15 the build 
time of many package increased a lot with C++ code?

I am talking about an increase in the build time of many packages 
between 20% and over 100%.

Some code (e.g. Qt) does not seem to be affected.

An example where build time more than doubled in a binNMU:
https://buildd.debian.org/status/logs.php?pkg=opm-simulators&arch=riscv64

On amd64/arm64/mips64el/ppc64el no huge increase happened[1] when 
comparing same/similar buildds:
https://buildd.debian.org/status/logs.php?pkg=opm-simulators&arch=amd64
https://buildd.debian.org/status/logs.php?pkg=opm-simulators&arch=arm64
https://buildd.debian.org/status/logs.php?pkg=opm-simulators&arch=mips64el
https://buildd.debian.org/status/logs.php?pkg=opm-simulators&arch=ppc64el

cu
Adrian

[1] the binNMU was still built with GCC 14 on these architectures,
    but -2 should be identical except on ppc64el


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