Alright, after compiling for approximately 16 hours, it looks like this 
works. Thanks so much!

On Tuesday, August 11, 2020 at 3:02:54 PM UTC-7 Matthew Flatt wrote:

> Ah, that makes sense.
>
> Does configuring with `--enable-mach=arm32le` work? 
>
> Using "arm32le" instead of the inferred "tarm32le" avoids memory-fence
> instructions, so it should solve this problem, but I'm not certain the
> rest of the build will adapt correctly.
>
> At Tue, 11 Aug 2020 14:35:49 -0700 (PDT), Joey Eremondi wrote:
> > I'm on an old RPi B (maybe a B+). It's pretty ancient, so I might be 
> > pushing my luck. Here's my CPU info:
> > 
> > pi@raspberrypi:~ $ cat /proc/cpuinfo
> > processor : 0
> > model name : ARMv6-compatible processor rev 7 (v6l)
> > BogoMIPS : 697.95
> > Features : half thumb fastmult vfp edsp java tls 
> > CPU implementer : 0x41
> > CPU architecture: 7
> > CPU variant : 0x0
> > CPU part : 0xb76
> > CPU revision : 7
> > 
> > Hardware : BCM2835
> > Revision : 000e
> > Serial : 00000000e9b1ce2d
> > Model : Raspberry Pi Model B Rev 2
> > 
> > Running GDB gives the illegal instruction as 
> > <UNDEFINED> instruction: 0xf57ff05a
> > which looks to be a "Data Memory Barrier" instruction? Sounds like a 
> > plausible culprit.
> > 
> > Thanks!
> > 
> > 
> > 
> > On Tuesday, August 11, 2020 at 2:14:28 PM UTC-7, Matthew Flatt wrote:
> > >
> > > Which model Pi are you using? I'm able to build on a Pi 3, so I wonder 
> > > if it's a difference in processors, where the Arm32 backend is using 
> > > something that it shouldn't. 
> > >
> > > Whether or not that guess is right, can you try running `gdb` in the 
> > > "ChezScheme" directory like this? 
> > >
> > > env SCHEMEHEAPDIRS=tarm32le/boot/tarm32le/ \ 
> > > gdb tarm32le/bin/tarm32le/scheme 
> > >
> > > Disassembling around the failed instruction address (with 
> `disassemble` 
> > > in gdb) should clarify what instruction is misused. 
> > >
> > > Thanks, 
> > > Matthew 
> > >
> > > At Tue, 11 Aug 2020 10:58:03 -0700 (PDT), Joey Eremondi wrote: 
> > > > I'm wondering, does anybody have any prebuilt 32-but ARM binaries 
> for 
> > > > Racket on Chez? I'm trying to run a little web-server on a raspberry 
> pi, 
> > > > and I'd prefer to use the Chez version, but I can't seem to get it 
> to 
> > > build. 
> > > > 
> > > > Alternately, if anybody knows why it won't build and can help, that 
> > > would 
> > > > help. With eiether --enable-csracket or --enable-csonly, it gets 
> stuck 
> > > > compiling the forked version of ChezScheme. Surprisingly, it doesn't 
> > > seem 
> > > > to be an out of memory error. Is the illegal instruction error 
> because 
> > > it's 
> > > > ARMv6 and not AArch32? 
> > > > 
> > > > ... 
> > > > gcc -Wpointer-arith -Wextra -Werror -Wno-implicit-fallthrough -O2 -g 
> > > -O2 - 
> > > > Wall -DELF_FIND_BOOT_SECTION -pthread -rdynamic -o 
> > > ../bin/tarm32le/scheme 
> > > > ../boot/tarm32le/main.o ../boot/tarm32le/libkernel.a -lm -ldl 
> -lpthread 
> > > -lrt 
> > > > -luuid ../zlib/libz.a ../lz4/lib/liblz4.a -pthread 
> > > > (cd s && make bootstrap) 
> > > > make allx 
> > > > rm -f *.tarm32le xpatch patch *.patch *.so *.covin *.asm script.all 
> > > header.tmp 
> > > > *.html 
> > > > rm -rf nanopass 
> > > > cp -p -f ../boot/tarm32le/petite.boot ../boot/tarm32le/sbb 
> > > > cp -p -f ../boot/tarm32le/scheme.boot ../boot/tarm32le/scb 
> > > > make all 
> > > > echo '(reset-handler abort)'\ 
> > > > '(base-exception-handler (lambda (c) (fresh-line) 
> > > > (display-condition c) (newline) (reset)))'\ 
> > > > '(keyboard-interrupt-handler (lambda () (display 
> > > > "interrupted---aborting\n") (reset)))'\ 
> > > > '(optimize-level 3)'\ 
> > > > '(debug-level 0)'\ 
> > > > '(commonization-level (commonization-level))'\ 
> > > > '(compile-compressed #t)'\ 
> > > > '(compress-format (compress-format))'\ 
> > > > '(compress-level (compress-level))'\ 
> > > > '(generate-inspector-information #f)'\ 
> > > > '(subset-mode (quote system))'\ 
> > > > '(compile-file "cmacros.ss" "cmacros.so")'\ 
> > > > | ../bin/tarm32le/scheme -q 
> > > > Error: illegal instruction 
> > > > () 
> > > > make[10]: *** [Mf-base:375: cmacros.so] Error 1 
> > > > make[9]: *** [Mf-base:179: allx] Error 2 
> > > > make[8]: *** [Mf-base:196: bootstrap] Error 2 
> > > > make[7]: *** [Makefile:22: build] Error 2 
> > > > make[6]: *** [Makefile:20: build] Error 2 
> > > > make[6]: Leaving directory '/home/pi/gh/racket-7.8/src/ChezScheme' 
> > > > make[5]: *** [Makefile:158: scheme-make-finish] Error 2 
> > > > make[5]: Leaving directory '/home/pi/gh/racket-7.8/src/cs/c' 
> > > > make[4]: *** [Makefile:148: scheme-make-copy] Error 2 
> > > > make[4]: Leaving directory '/home/pi/gh/racket-7.8/src/cs/c' 
> > > > make[3]: *** [Makefile:137: scheme] Error 2 
> > > > make[3]: Leaving directory '/home/pi/gh/racket-7.8/src/cs/c' 
> > > > make[2]: *** [Makefile:60: cs] Error 2 
> > > > make[2]: Leaving directory '/home/pi/gh/racket-7.8/src/cs/c' 
> > > > make[1]: *** [Makefile:90: racketcs] Error 2 
> > > > make[1]: Leaving directory '/home/pi/gh/racket-7.8/src' 
> > > > make: *** [Makefile:53: all] Error 2 
> > > > 
> > > > 
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