Build on Mac OS Tahoe

[yobson]

I'm trying to build head on Mac OS Tahoe.
I find that all of the ./engine/libgforth* segfaults. This is discovered in the tests:

libtool: warning: '-version-info' is ignored for programs
make[3]: Leaving directory '/nix/var/nix/builds/nix-56481-1589693875/gforth-d6d0d7e/engine'
make[3]: Entering directory '/nix/var/nix/builds/nix-56481-1589693875/gforth-d6d0d7e'
TEST ./engine/libgforth-ll coretests
--- -   2026-04-13 15:21:56.652826000 +0000
+++ ./test/coretest.out 1970-01-01 00:00:01.000000000 +0000
@@ -0,0 +1,17 @@
+YOU SHOULD SEE THE STANDARD GRAPHIC CHARACTERS:
+ !"#$%&'()*+,-./0123456789:;<=>?@
+ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`
+abcdefghijklmnopqrstuvwxyz{|}~
+YOU SHOULD SEE 0-9 SEPARATED BY A SPACE:
+0 1 2 3 4 5 6 7 8 9
+YOU SHOULD SEE 0-9 (WITH NO SPACES):
+0123456789
+YOU SHOULD SEE A-G SEPARATED BY A SPACE:
+A B C D E F G
+YOU SHOULD SEE 0-5 SEPARATED BY TWO SPACES:
+0  1  2  3  4  5
+YOU SHOULD SEE TWO SEPARATE LINES:
+LINE 1
+LINE 2
+you should see this first.
+you should see this later.

Full build log attached!

build-log.txt

[forthy42]

There are a number of warnings:

ld: warning: could not create compact unwind for _graceful_exit: registers 19 and 20 not saved contiguously in frame

The warnings can be disabled when you configure with

./configure CC=gcc- LDFLAGS="-Wl,-no_compact_unwind"

but I don't know if this fixes the problem. Cfarm has a MacOS 26 (Tahoe) machine available, so I can try my own luck there.

[forthy42]

I tried compiling it using gcc-15 on the CFarm machine, and it succeeded, including the libgforth variants. Did you use clang-21 instead? This is not recommended.