This problem seems to have gone away. Works fine with #JiffyDOS today. I figured it should, since it does on original hardware.
Here's a way to get a decent setup rolling with Power C on the #C64U. This is simpler than it looks.
The Oasis BBS
Peter Krefting
Ben CoxUnmodified-PowerC.d81 to your flash/SD, or grab the two D64 images. If you grabbed the D81, skip to step 5..h files from drive 8 to drive 9. Note that you can copy files in and out of images directly on the C64U menu; you can just arrow into image files and copy and paste from there just like normal directories.LOAD"SHELL",8 (not ,8,1; that didn't work for me) and RUN it. You will now see a $ prompt.work 9 0; this means drive 9 is your work disk.l lists the files on the WORK disk (9, with your sources) and ls lists the files on the SYSTEM disk (drive 8)ed or ced to edit your file. If you are confused press RUN/STOP and type help at the command prompt. To quit: R/S quit.cc -p foo.c and it will read it from drive 9. The .h files must be on the same drive.link to produce a .sh executable that runs under the shell, or link -s to make a standalone executable with a BASIC loader. Type the name of your foo.o file and then type ^ (up arrow) to load the dependencies. Then hit enter and type your executable name (including the .sh if you didn't use -s).foo (without the .sh). Or go back to BASIC and load/run it with LOAD and RUN, if you linked with -s. Go back to BASIC from shell with bye.Voila. You can now edit, compile, and run C programs from a shell, directly on your C64. And with JiffyDOS it's reasonably fast, too. But it's only 40 columns.
Naturally, you can do the same thing on a real C64, but with only 1541s you will be sad because the whole compiler system doesn't fit on one 5.25" SS/SD floppy. It would probably fit on a 1571 5.25" DS/HD floppy, and definitely fits on a 3.5" 1581 floppy. It's just harder to set up, mostly because of copying the files.
BTW there is a Power C manual on archive.org.
