Quirks.

Building and running

names get mangled when I build. There are ways to avoid it but, meh. The tutorial had the following output:

    .text
    .globl scheme_entry
    .type scheme_entry, @function
scheme_entry:
    movl $~s, %eax" x
 ret"

gcc mangles it. It becomes:

    .text
    .globl _scheme_entry
    .type scheme_entry, @function
_scheme_entry:
    movl $~s, %eax" x
 ret"

so........... i just changed it to that.

.type directive in asm not recognized on Mach-O ABI (application binary interface). Unfortunately this is what mac uses. So, what was

    .text
    .globl _scheme_entry
    .type scheme_entry, @function
_scheme_entry:
    movl $~s, %eax" x
 ret"

should instead be

    .text
    .globl _scheme_entry

_scheme_entry:
    movl $~s, %eax" x
 ret"

tests-driver.scm was missing a definition, add-tests-with-string-output-noboot , which caused the test driver to fail. I just copied over add-tests-with-string-output and it works fine now. This is what i get for using stuff i find online.
compile-program needed to be defined at the top of test runner, or chez would complain that it wasn't defined. Thank you, internet.