-------- Vidarebefordrat meddelande -------- Ämne: Re: Linux on VAX Datum: Thu, 24 Oct 2019 13:50:08 +0200 Från: Klaus Kämpf <kkaempf@suse.de> Till: Maciej W. Rozycki <macro@linux-mips.org> Kopia: jbglaw@getshlash.de, Jan Prunk <janprunk@gmail.com>, vax-linux@lug-owl.de, jbglaw@lug-owl.de

* Maciej W. Rozycki <macro@linux-mips.org> [Oct 23. 2019 23:04]:

...

The next issue is moving from reload to LRA, but that is not imminent. I'm sure our assistance would be welcome here, but our port has never reached the stability required for the GCC test suite to produce stable results, which in turn is required for port verification.

I volunteered some years ago and I volunteer again: Having ported the GNU compiler toolchain to VMS/AXP, I believe to have some experience maintaining this code ;-)

Can you point me to a (github?) repo where this code is hosted ?

Klaus

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Hi, I know how these posts are often demotivating, so below is my own progress and self-documentation. However, feel free to completely throw all of it out. If you convert upstream GCC to CCmode or LRA, I will have no trouble merging these patches to that version. Don't worry about it. CCmode is a minimum requirement because cc0 ports are going to become deprecated in GCC, then removed. LRA is less urgent, but it might help us avoid bugs. GCC developers refer to reload as the devil, and we're one of few neglected architectures using it. ------------------------------------------------------ I don't know if any of my patches are interesting. They are split into tasks: - Merge the netbsd/vax code, which isn't necessarily interesting for non-netbsd. I am discussing them in https://gcc.gnu.org/ml/gcc/2019-09/msg00154.html This has two remaining issues with the patch: - The atomic patterns crash when building libatomic. They previously were not in use because builtins.md was not included. I'm spending so long stuck on this I might just comment them out. - flag_dwarf2_cfi_asm = 0, this is crashing when building netbsds libc, in binutils, like https://github.com/riscv/riscv-binutils-gdb/issues/76 it might be possible to overlook this problem because the fix will not be in GCC anyway. - CCmode draft, which might be generally interesting. It cannot compile basic programs. https://github.com/coypoop/gcc/tree/vax3 The documentation for turning to CCmode is here: https://gcc.gnu.org/wiki/CC0Transition - Additionally, I have my list of distinct crashes with reproducers and some notes: https://wiki.netbsd.org/users/maya/vax-gcc/ (These crash on a cross compiler) - I have some local patches I use to do a complete, clean build. Perhaps I should create a branch with those for easy testing, with build instructions I use for netbsd/vax.