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lib/systems/parse: don't consider mode switching CPUs compatible

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Since we (exclusively) use isCompatible to gauge whether platform a can
execute binaries built for platform b, mode switching CPUs are not to be
considered compatible for our purposes: Switching the mode of a CPU
usually requires a reset. At the very least we can't execute a mix of
executables for the two modes which would usually be the case in nixpkgs
where we may want to execute buildInputs for the hostPlatform in
addition to nativeBuildInputs for the buildPlatform.
This commit is contained in:
sternenseemann 2022-04-26 22:08:44 +02:00
parent 953b5d19bc
commit fe836f3564
1 changed files with 6 additions and 13 deletions
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19
lib/systems/parse.nix
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@ -148,8 +148,10 @@ rec {
# Every CPU is compatible with itself.
# - (transitivity)
# If A is compatible with B and B is compatible with C then A is compatible with C.
# - (compatible under multiple endianness)
# CPUs with multiple modes of endianness are pairwise compatible.
#
# Note: Since 22.11 the archs of a mode switching CPU are no longer considered
# pairwise compatible. Mode switching implies that binaries built for A
# and B respectively can't be executed at the same time.
isCompatible = a: b: with cpuTypes; lib.any lib.id [
# x86
(b == i386 && isCompatible a i486)
@ -191,22 +193,13 @@ rec {
(b == aarch64 && a == armv8a)
(b == armv8a && isCompatible a aarch64)
(b == aarch64 && a == aarch64_be)
(b == aarch64_be && isCompatible a aarch64)
# PowerPC
(b == powerpc && isCompatible a powerpc64)
(b == powerpcle && isCompatible a powerpc)
(b == powerpc && a == powerpcle)
(b == powerpc64le && isCompatible a powerpc64)
(b == powerpc64 && a == powerpc64le)
(b == powerpcle && isCompatible a powerpc64le)
# MIPS
(b == mips && isCompatible a mips64)
(b == mips && a == mipsel)
(b == mipsel && isCompatible a mips)
(b == mips64 && a == mips64el)
(b == mips64el && isCompatible a mips64)
(b == mipsel && isCompatible a mips64el)
# RISCV
(b == riscv32 && isCompatible a riscv64)