Simon Jakobi pushed to branch wip/sjakobi/T25450-print-cpu at Glasgow Haskell Compiler / GHC

Commits:

• 60110d3f
  by Simon Jakobi at 2026-05-29T11:59:06+02:00

  changelog.d: Restore code block using indentation syntax
  
  The previous commit dropped the JSON example because a '{' in a
  brace-delimited field value (description: { ... }) makes the Cabal
  Distribution.Fields parser fail. Indentation-delimited field values
  are not affected, so switch to that syntax and restore the example.
  
  Verified against Cabal-3.16's readFields': the brace form rejects any
  '{' or '}' anywhere in the content, while the indentation form parses
  the same content cleanly.
  
  Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
  

1 changed file:

• changelog.d/print-enabled-cpu-features

Changes:

 issues: #25450

 mrs: !16117

-description: {

+description:

   GHC now supports a new mode flag ``--print-enabled-cpu-features``, which

   prints a JSON object describing the CPU features currently enabled for code

   generation, together with a minimal set of ``-m...`` flags that would

   reproduce the non-default effective feature set for the current target.

-  Dynamic options such as ``-mavx2`` and ``-mbmi2`` are respected.

+  Dynamic options such as ``-mavx2`` and ``-mbmi2`` are respected. ::

+

+    $ ghc -mavx2 --print-enabled-cpu-features

+    {"tag":"enabled-cpu-features","version":1,"target":"x86_64-linux-gnu",

+     "features":["SSE2","SSE3","SSSE3","SSE4.1","SSE4.2","AVX","AVX2"],

+     "as_m_flags":["-mavx2"]}

   This is a first step toward implementing ``-march=native``.

-}