Missing symbols in ghc-stage2 executable
Ömer Sinan Ağacan
omeragacan at gmail.com
Mon Feb 10 08:45:48 UTC 2020
Does anyone know why I get so little symbols in stage 2 compiler compared to
programs built with the same stage 2 compiler?
This is the build.mk I'm using
BuildFlavour = quick
ifneq "$(BuildFlavour)" ""
GhcRtsHcOpts += -O0 -g3
GhcStage2HcOpts += -debug -g5
GhcLibHcOpts += -g5
GhcThreaded = NO
BUILD_PROF_LIBS = NO
HADDOCK_DOCS = NO
BUILD_SPHINX_HTML = NO
BUILD_SPHINX_PDF = NO
BUILD_MAN = NO
STRIP_CMD = :
Symbols in stage 2 compiler built with this build.mk:
$ nm /home/omer/haskell/ghc/inplace/lib/bin/ghc-stage2 | wc -l
If I build `main = return ()` with the same compiler:
$ cat test.hs
main = return ()
$ /home/omer/haskell/ghc/inplace/bin/ghc-stage2 -g5 -O0 test -fforce-recomp
[1 of 1] Compiling Main ( test.hs, test.o )
Linking test ...
$ nm test | wc -l
So it seems like a lot of symbols in the libraries are missing in the stage 2
I tried setting `DYNAMIC_GHC_PROGRAMS = NO` but I got even less number of
symbols in the stage 2 compiler.
I also confirmed this using a debugger program I wrote which can find info table
labels of objects in the heap when I run it on `test.hs` above but not when I
run it on the stage 2 executable.
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