This is a list of significant pain points that I need to fix eventually. Some of these items are statements of problems, some suggest workarounds, and others just note the terrible hacks in place to get a functioning system.
Unbundle BIND.
Since glib has a hard dependency on CLOCK_MONOTONIC, glibc now pretends to
support it by using CLOCK_REALTIME and hoping the clock won't change.
The name service caching daemon is disabled due to its usage of nptl being incompatible with libpthread.
Figure out what dependencies broke to build librt before libpthread.
The default trusted CA file is /etc/ssl/ca-bundle.pem, but this file is not
provided at the moment. Try stealing /etc/pki/tls/cert.pem, if you trust it.
Fix cross-compilation of everything that uses Guile for 2.2.
Build IceCat without GTK+ 2, and fix Emacs to run with GTK+ 3 to remove GTK+ 2.
The Linux-libre configuration only builds support for some of the hardware in my immediate vicinity, so it's really not that portable without tweaking.
Audio passthrough was not yet tested on non-QEMU host platforms.
Add more wireless options in addition to WPA2 (WPA-PSK) and unencrypted.
It seems pointless to statically link both qemu and wpa_supplicant binaries
with the same C library. Maybe compile the minimal required shared libraries
for the Linux target, so this won't rely on pre-built static libraries anymore.
Get xattr translators working and use a Linux-compatible ext2 file system.
Try switching to lwIP.
It's a flaky, slow, experimental Hurd port. Using Emacs to browse the web will probably be more enjoyable.
Add support for libidn2, since its features had to be disabled for the upgrade.
Drop PCRE in favor of PCRE2. This requires porting grep, less, wget, and glib. Alternatively, wget could be replaced by wget2 to gain support for PCRE2.
Hook up NetBSD drivers to the Hurd PCI arbiter.
Both /usr/sbin/halt and /usr/sbin/reboot break if Shepherd is not running.
In this case, you can explicitly call Hurd's /sbin/halt and /sbin/reboot.
The Apple EFI disk label images apparently only work with an ESP on HFS+, and I don't feel like making two ESPs just for this. Apple menus can stay icon-only.
When the X server exits, it can mess up the Hurd console screen resolution and
font rendering slightly. Run sudo herd restart console to correct it.
Maybe prepend %global with_bootstrap 1 to specs that don't require a complete
GCC so there are more parallel builds happening during the bootstrap phase.
I need to write an autoconf file to run on the final OS image to regenerate the
config.site results to keep cross-compiling settings up to date with native.
There are some issues where a few GCC libraries in the tools libdir can't be found during linking. This is temporarily solved by symlinking them into the regular sysroot libdir. Maybe just put it all in the sysroot by default.
This thing is still a "well, it works" hack. I really should learn Guile.
DNF can have Transaction check error failures when installing overlapping
package sets in parallel. To work around this, a big ugly locking mechanism
was added to force the builddep phase to run one-at-a-time. Use the fallback
setup-sysroot.sh script if problems arise with this.
DNF also doesn't support setting options on temporary repositories, so it still uses the ugly method of reading the configuration from a here-document.
Maybe look into automatically generating spec files from the Make files so that there is only one source of build commands. This could also potentially allow OS-independent bootstrapping by generating an unpackaged sysroot as well.
Assuming I don't go with automatically generated specs as noted above, combine all devel subpackages into the main packages like with MinGW.