2.060 tests fine - but I don't know precisely what it was that changed from the earlier versions of gcc/runtime in relation to log10 - nor whether it was a change for the best, or a bug.
Do you have a simple C script that demonstrates this change ?
Mingw's complex.h includes clog10() beginning with Strawberry's release of perl-5.30.0 (gcc-8.3.0, runtime 6.0), so it should be available to these Windows builds, and onwards.

Cheers,
Rob

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