Enable eventlog support in all ways by defaultwip/T18948

Here we deprecate the eventlogging RTS ways and instead enable eventlog
support in the remaining ways. This simplifies packaging and reduces GHC
compilation times (as we can eliminate two whole compilations of the RTS)
while simplifying the end-user story. The trade-off is a small increase
in binary sizes in the case that the user does not want eventlogging
support, but we think that this is a fine trade-off.

This also revealed a latent RTS bug: some files which included `Cmm.h`
also assumed that it defined various macros which were in fact defined
by `Config.h`, which `Cmm.h` did not include. Fixing this in turn
revealed that `StgMiscClosures.cmm` failed to import various spinlock
statistics counters, as evidenced by the failed unregisterised build.

Closes #18948.

1 files changed, 2 insertions, 10 deletions

diff --git a/compiler/GHC/Utils/Error.hs b/compiler/GHC/Utils/Error.hs
index db8107a65f..ef6dd4f07d 100644
--- a/compiler/GHC/Utils/Error.hs
+++ b/compiler/GHC/Utils/Error.hs
@@ -521,16 +521,8 @@ easily compute totals with tools like ghc-events-analyze (see below).
 Producing an eventlog for GHC
 -----------------------------
 
-To actually produce the eventlog, you need an eventlog-capable GHC build:
-
-  With Hadrian:
-  $ hadrian/build -j "stage1.ghc-bin.ghc.link.opts += -eventlog"
-
-  With Make:
-  $ make -j GhcStage2HcOpts+=-eventlog
-
-You can then produce an eventlog when compiling say hello.hs by simply
-doing:
+You can produce an eventlog when compiling, for instance, hello.hs by simply
+running:
 
   If GHC was built by Hadrian:
   $ _build/stage1/bin/ghc -ddump-timings hello.hs -o hello +RTS -l