Can you be more specific?

Just running gpgscm crashes with segfault. Is this backtrace sufficient or do
you need me to investigate further?

(gdb) run
Starting program: /root/rpmbuild/BUILD/gnupg-2.1.19/tests/gpgscm/gpgscm
Missing separate debuginfos, use: dnf debuginfo-install glibc-2.25.90-1.fc27.ppc64
Error: init.scm:785: eval: unbound variable: define-macro

Program received signal SIGSEGV, Segmentation fault.
oblist_find_by_name (name=name@entry=0x20071a50 "args",
slot=slot@entry=0x3fffffffe680, sc=<optimized out>, sc=<optimized out>) at
scheme.c:1128
1128 s = symname(car(x));
Missing separate debuginfos, use: dnf debuginfo-install
libgcrypt-1.7.6-2.fc26.ppc64 libgpg-error-1.25-2.fc26.ppc64
ncurses-libs-6.0-8.20170212.fc26.ppc64 readline-7.0-5.fc26.ppc64
(gdb) bt
#0 oblist_find_by_name (name=name@entry=0x20071a50 "args",
slot=slot@entry=0x3fffffffe680, sc=<optimized out>, sc=<optimized out>) at
scheme.c:1128
#1 0x000000002001cd4c in mk_symbol (sc=sc@entry=0x20070660, name=0x20071a50
"args") at scheme.c:1384
#2 0x000000002001de6c in mk_atom (sc=sc@entry=0x20070660, q=<optimized out>) at
scheme.c:1496
#3 0x0000000020021114 in opexe_5 (sc=0x20070660, op=<optimized out>) at
scheme.c:5012
#4 0x000000002001d770 in Eval_Cycle (sc=sc@entry=0x20070660,
op=op@entry=OP_T0LVL) at scheme.c:5392
#5 0x000000002002712c in scheme_load_named_file (sc=0x20070660, fin=0x200d4de0,
filename=0x20038d30 "ffi.scm") at scheme.c:5782
#6 0x000000002000d590 in load (sc=0x20070660, file_name=0x20038d30 "ffi.scm",
lookup_in_cwd=<optimized out>, lookup_in_path=1) at main.c:180
#7 0x000000002000cf88 in main (argc=<optimized out>, argv=<optimized out>) at
main.c:268

print x
$1 = (pointer) 0xa200b8868
(gdb) print *x
Cannot access memory at address 0xa200b8868

Would you be so kind to test the attached patch?

(I'm operating on a hunch. Also, I'm not happy with that feature I introduced,
so I'm going to remove it one way or another. But if this was the cause of the
troubles, I'd add a remark in the commit message.)

D414: 974_gpgscm-remove-immediates.diff

Yes, this fixed the segfault.

Fixed in 38c955599f7c6c20faeec57d8e1df7d2c0eeba18.

Thanks for testing.