GHC 9.x segfaults on 32-bit big-endian PowerPC
It's not possible to build GHC versions later than 9.0.2 on 32-bit big-endian PowerPC as the compiler segfaults during build:
(sid_powerpc-dchroot)glaubitz@perotto:~/ghc/ghc-9.4.6$ "/usr/bin/ghc" -hisuf hi -osuf o -hcsuf hc -static -H32m -O2 -lffi -optl-pthread -Wall -package-db libraries/bootstrapping.conf -this-unit-id template-haskell-2.19.0.0 -hide-all-packages -package-env - -i -ilibraries/template-haskell/./vendored-filepath -ilibraries/template-haskell/. -ilibraries/template-haskell/dist-boot/build -Ilibraries/template-haskell/dist-boot/build -ilibraries/template-haskell/dist-boot/build/./autogen -Ilibraries/template-haskell/dist-boot/build/./autogen -Ilibraries/template-haskell/. -optP-include -optPlibraries/template-haskell/dist-boot/build/./autogen/cabal_macros.h -package-id base-4.15.1.0 -package-id ghc-boot-th-9.4.6 -package-id ghc-prim-0.7.0 -package-id pretty-1.1.3.6 -Wall -this-unit-id template-haskell -XHaskell2010 -XNoImplicitPrelude -XImplicitPrelude -no-user-package-db -rtsopts -fno-warn-deprecated-flags -outputdir libraries/template-haskell/dist-boot/build -c libraries/template-haskell/./Language/Haskell/TH/Ppr.hs -o libraries/template-haskell/dist-boot/build/Language/Haskell/TH/Ppr.o
Segmentation fault (core dumped)
(sid_powerpc-dchroot)glaubitz@perotto:~/ghc/ghc-9.4.6$ gdb /usr/lib/ghc/bin/ghc ./core GNU gdb (Debian 13.2-1) 13.2 Copyright (C) 2023 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details.
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Reading symbols from /usr/lib/ghc/bin/ghc...
(No debugging symbols found in /usr/lib/ghc/bin/ghc)
[New LWP 584005]
[New LWP 584007]
[New LWP 584006]
[New LWP 584009]
[New LWP 584008]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/powerpc-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/lib/ghc/bin/ghc -B/usr/lib/ghc -hisuf hi -osuf o -hcsuf hc -static -H32m -'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0e3a27e4 in base_GHCziFloat_fromRat_closure () from /usr/lib/ghc/bin/../base-4.15.1.0/libHSbase-4.15.1.0-ghc9.0.2.so
[Current thread is 1 (Thread 0xf7f9c2a0 (LWP 584005))]
(gdb) bt
#0 0x0e3a27e4 in base_GHCziFloat_fromRat_closure () from /usr/lib/ghc/bin/../base-4.15.1.0/libHSbase-4.15.1.0-ghc9.0.2.so
#1 0x0d867ddc in ghczmbignum_GHCziNumziBigNat_bigNatIsPowerOf2zh_info () from /usr/lib/ghc/bin/../ghc-bignum-1.1/libHSghc-bignum-1.1-ghc9.0.2.so
#2 0x0d41a560 in ?? () from /usr/lib/ghc/bin/../rts/libHSrts_thr-ghc9.0.2.so
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)I have been trying to work around this crash but so far haven't found a solution.
Building an unregisterised compiler fails due to integer overflows in the generated assembly code.