[tlbuild] Core dump with image inclusion inside LuaTeX on Sparc Solaris

[John Paul Adrian Glaubitz]

Hi!

The alignment issue does not only affect Solaris/SPARC but also Linux/SPARC.

see: https://buildd.debian.org/status/fetch.php?pkg=texlive-bin&arch=sparc64&ver=2019.20190605.51237-2&stamp=1562791518&raw=0

Could you extend the fix for these platforms?

Please note for 32-bit Linux, the compiler defines __sparc__ while for 64-bit Linux, it defines __sparc__ && __arch64__. There is no __sparc64__ macro.

It might be a better idea to fix the alignment unconditionally so that future platforms are not affected either.

Thanks,
Adrian
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