"Too much files to mangle" error

[Mathieu Othacehe]

Hello,

I'm trying to generate an ISO image for GNU Guix, and it seems that I'm
hitting a limit: "Too much files to mangle, cannot guarantee unique file
names".

--8<---------------cut here---------------start------------->8---
Media summary: 0 sessions, 0 data blocks, 0 data,  103g free
Added to ISO image: directory 
'/'='/tmp/guix-build-iso9660-image.drv-0/grub.vdSJyF'
xorriso : UPDATE :     568 files added in 1 seconds
Added to ISO image: file 
'/boot/grub/grub.cfg'='/gnu/store/a7rgihif88bz78asvs06a1kip0lpk0zf-grub.cfg'
xorriso : UPDATE :   28900 files added in 1 seconds
xorriso : UPDATE :   57900 files added in 2 seconds
xorriso : UPDATE :   83700 files added in 3 seconds
xorriso : UPDATE :  101700 files added in 4 seconds
xorriso : UPDATE :  130500 files added in 5 seconds
xorriso : UPDATE :  158100 files added in 6 seconds
xorriso : UPDATE :  183600 files added in 7 seconds
xorriso : UPDATE :  211400 files added in 8 seconds
xorriso : UPDATE :  237700 files added in 9 seconds
xorriso : UPDATE :  269400 files added in 10 seconds
xorriso : UPDATE :  303300 files added in 11 seconds
xorriso : UPDATE :  322100 files added in 12 seconds
xorriso : UPDATE :  349800 files added in 13 seconds
xorriso : UPDATE :  376700 files added in 14 seconds
xorriso : UPDATE :  402400 files added in 15 seconds
xorriso : UPDATE :  426300 files added in 16 seconds
Added to ISO image: directory 
'/'='/gnu/store/w3iiqacklz0cnkll6g0wnqxml2mgxd9c-image-root'
xorriso : UPDATE :  434919 files added in 18 seconds
xorriso : NOTE : Copying to System Area: 512 bytes from file 
'/gnu/store/sscjk2k4l4yqrgmjkifgld25z3qvx2ys-grub-hybrid-2.04/lib/grub/i386-pc/boot_hybrid.img'
libisofs: FAILURE : HFS+ map nodes aren't implemented
libisofs: FAILURE : Too much files to mangle, cannot guarantee unique file names
xorriso : FAILURE : Failed to prepare session write run
xorriso : NOTE : -return_with SORRY 32 triggered by problem severity FAILURE
/gnu/store/sscjk2k4l4yqrgmjkifgld25z3qvx2ys-grub-hybrid-2.04/bin/grub-mkrescue: 
error: `xorriso` invocation failed
--8<---------------cut here---------------end--------------->8---

Is this possible to get around this limit?

Thanks,

Mathieu

PS: I'm aware that it's probably not a bug of Xorriso but I couldn't
find any other public ML.