libgcc15 can't find "md-unwind-def.h" (10.5.8)

[nbuwe (Valery Ushakov)]

On MacOS 10.5.8 Leopard, PowerPC (mini g4) with the latest officially available xcode xcode314_2809_developerdvd.dmg installed

I'm trying to build cmake. I need it to build another piece of old but still maintained software (​Self) to understand whether its macos support has bitrotted or not.

After chugging along for a few days (gcc10-bootstrap took quite a while) it first told me that:

Error: libgcc15 cannot be built while libunwind-headers is active.
Error: Please forcibly deactivate libunwind-headers, e.g. by running:
Error:
Error:     sudo port -f deactivate libunwind-headers
Error:

I did as I'm told, did port clean libgcc15 for good measure and started port install libgcc15. It fails after a while with:

:info:build /opt/local/var/macports/build/libgcc15-fab548dd/work/gcc-15.2.0/libgcc/unwind-dw2.h:25:10: fatal error: md-unwind-def.h: No such file or directory
:info:build    25 | #include "md-unwind-def.h"
:info:build       |          ^~~~~~~~~~~~~~~~~

(full log in the attachment).

Anything I'm doing wrong here? "md-unwind-def.h" sounds like gcc's internal header.

Thanks for keeping this alive for such an old system! If fixing this in macports is not feasible, any advice on how to get cmake for 10.5.8 is appreciated. TIA.

[nbuwe (Valery Ushakov)]

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc15/libgcc15/main.log

[nbuwe (Valery Ushakov)]

This ​https://gcc.gnu.org/pipermail/gcc-patches/2024-September/663221.html seems pertinent.

[nbuwe (Valery Ushakov)]

$ pwd
/opt/local/var/macports/build/libgcc15-fab548dd/work/build/powerpc-apple-darwin9/libgcc
$ ls -lF
total 176
-rw-r--r--  1 macports  admin  40829 Oct 26 17:30 Makefile
-rw-r--r--  1 macports  admin   3174 Oct 26 17:30 auto-target.h
-rw-r--r--  1 macports  admin   4117 Oct 26 17:30 config.cache
-rw-r--r--  1 macports  admin  54289 Oct 26 17:30 config.log
-rwxr-xr-x  1 macports  admin  37663 Oct 26 17:30 config.status*
lrwxr-xr-x  1 macports  admin     83 Oct 26 17:30 gthr-default.h@ -> /opt/local/var/macports/build/libgcc15-fab548dd/work/gcc-15.2.0/libgcc/gthr-posix.h
-rw-r--r--  1 macports  admin    219 Oct 26 17:30 libgcc_tm.h
-rw-r--r--  1 macports  admin     10 Oct 26 17:30 libgcc_tm.stamp
lrwxr-xr-x  1 macports  admin     89 Oct 26 17:30 md-unwind-support.h@ -> /opt/local/var/macports/build/libgcc15-fab548dd/work/gcc-15.2.0/libgcc/config/no-unwind.h
-rw-r--r--  1 macports  admin      3 Oct 26 17:29 multilib.out
-rw-r--r--  1 macports  admin     10 Oct 26 17:30 stamp-h
lrwxr-xr-x  1 macports  admin     87 Oct 26 17:30 unwind.h@ -> /opt/local/var/macports/build/libgcc15-fab548dd/work/gcc-15.2.0/libgcc/unwind-generic.h

so md-unwind-support.h was created (with a makefile rule congruent to that of the missing md-unwind-def.h.

I gonna create the link manually and restart from there...

[nbuwe (Valery Ushakov)]

So, after repeating that manual step of creating md-unwind-def.h a few times (for each gcc build stage, I guess) and restarting the build it did build successfully.