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vacask: set OpenVAF target CPU

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VACASK's device models are compiled by OpenVAF, a Verilog-A compiler.

By default, OpenVAF's `--target_cpu native` tells it to use every CPU
instruction available on the machine doing the build (e.g. AVX-512, if the
builder happens to have it). If the resulting binary is then run on a
different, older CPU that doesn't support those instructions, it crashes
with "illegal instruction" (SIGILL).

To avoid this, we detect which instruction set the CPU we're building for
actually supports and tell OpenVAF to target that instead, which keeps the
compiled models runnable on other x86_64 machines as well.

See:
  - bf59752fbf/README.md (installation-from-pre-built-packages)
  - dc36b3c506/lib/systems/architectures.nix

Assisted-by: DeepSeek V4 Flash Free
This commit is contained in:
eljamm
2026-08-19 12:29:35 +02:00
parent 73ba35da55
commit f93bdf7aec
1 changed files with 30 additions and 0 deletions
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30
pkgs/by-name/va/vacask/package.nix
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@@ -16,6 +16,35 @@
boost188,
suitesparse,
tomlplusplus,
# VACASK's device models are compiled by OpenVAF, a Verilog-A compiler.
#
# By default, OpenVAF's `--target_cpu native` tells it to use every CPU
# instruction available on the machine doing the build (e.g. AVX-512, if the
# builder happens to have it). If the resulting binary is then run on a
# different, older CPU that doesn't support those instructions, it crashes
# with "illegal instruction" (SIGILL).
#
# To avoid this, we detect which instruction set the CPU we're building for
# actually supports and tell OpenVAF to target that instead, which keeps the
# compiled models runnable on other x86_64 machines as well.
#
# See:
# - https://codeberg.org/arpadbuermen/VACASK/src/commit/bf59752fbfdfed18dc7fe2e3e11a9c02f8de28a0/README.md#installation-from-pre-built-packages
# - https://github.com/NixOS/nixpkgs/blob/dc36b3c506df17272cdca29e85d0d0190b068981/lib/systems/architectures.nix
openvafTargetCpu ?
with stdenv.hostPlatform;
if isx86_64 then
if avx512Support then
"x86-64-v4"
else if avx2Support then
"x86-64-v3"
else if sse4_2Support then
"x86-64-v2"
else
"x86-64"
else
"generic",
}:
let
@@ -79,6 +108,7 @@ stdenv.mkDerivation (finalAttrs: {
(lib.cmakeFeature "FLEX_INCLUDE_DIR" "${flex}/include")
(lib.cmakeFeature "SuiteSparse_DIR" "${suitesparse-include}")
(lib.cmakeFeature "TOMLPP_DIR" "${tomlplusplus}")
(lib.cmakeFeature "OPENVAF_OPTIONS" "--target_cpu ${openvafTargetCpu}")
];
doCheck = true;