-ddump-cmm doesn't work when compiling cmm files
I want to see Cmm generated for
StgMiscClosures.cmm so I tried adding
-ddump-cmm to the command the build system runs to build it, which doesn't work:
$ "inplace/bin/ghc-stage1" -static -O0 -H64m -Wall -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -DFS_NAMESPACE=rts -this-unit-id rts -dcmm-lint -i -irts -irts/dist/build -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen -O2 -Wcpp-undef -Wnoncanonical-monad-instances -c rts/StgMiscClosures.cmm -o rts/dist/build/StgMiscClosures.o -fforce-recomp -ddump-cmm
Why do I need cmm dumps of cmm files?
- When building Cmm even the parser does code generation, so the Cmm after parsing is quite different than the input and contains useful information.
- I want all macros to be expanded, running CPP manually is painful.
- I currently can't see output of Cmm optimisations when building Cmm files.