Thanks for the pointer to https://wiki.debian.org/ ArchitectureSpecificsMemo#Architecture_baselines.
I read there that "Each Debian architecture has a baseline indicating the oldest or least capable CPU on which the architecture can be used. The baseline can change between Debian releases. The baseline is mostly defined by the gcc-N package, which is configured to produce baseline binaries when options like -march= are not used." Is the choice of baseline a Debian-specific configuration of GCC? Or might another OS vendor configure differently such that "gcc" running on an i386 class machine actually targets something newer than i686? -Steve
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