Opened 6 months ago
enable -dcmm-lint by default for .cmm input files
|Reported by:||rwbarton||Owned by:|
|Type of failure:||None/Unknown||Difficulty:||Unknown|
|Test Case:||Blocked By:|
I'm finding it's quite easy to write .cmm files with subtle errors that cause ghc to emit code that wasn't what I wanted! For example, I wrote a comparison between two arguments of different integer sizes and the code generator picked the wrong size. After tracking down the bug, I tried -dcmm-lint and it caught my error right away.
It makes sense not to have -dcmm-lint enabled by default for Cmm produced from Stg, but I've seen here on the GHC wiki that -dcmm-lint is advised for hand-written .cmm files. But integer-gmp, and probably many other packages, don't build .cmm files with -dcmm-lint. Is there a reason we can't/shouldn't just make it the default?