alignment warning from ranlib?

I filed FB7836460 about a warning from ranlib when compiling static libraries from the command line.

Here's a representative warning (I've seen it for multiple libraries):

/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: archive member: lib[redacted].a([redacted].c.o) offset in archive not a multiple of 8 (must be since member is an 64-bit object file)

(The installed Xcode version is 12A8158a, if that matters. “ranlib" doesn’t have an option for reporting its version.)

My application seems to link OK against those libraries despite the warning, but is there any cause for concern here? Is this something I can resolve with an appropriate command-line flag to the compiler?