I've spent about half the day thinking I was hallucinating because my
setting of CMAKE_OSX_SYSROOT was apparently not being picked up. The
reason, as it turns out, seems to be that CMake really does ignore this
variable unless you're doing a multi-architecture build.
It looks like I need one set of compilation flags for a
single-architecture build, in which I use -isysroot explicitly, and
another set that omits -isysroot if multi-arch.
Sigh.
<b
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