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diff --git a/instructions.md b/instructions.md new file mode 100644 index 0000000000..6c8c4c6796 --- /dev/null +++ b/instructions.md @@ -0,0 +1,45 @@ +# Building GHC + +* Add the following to _build/hadrian.settings + +``` +stage1.*.ghc.hs.opts += -finfo-table-map -fdistinct-constructor-tables +``` + +* Build GHC as normal + +``` +./hadrian/build -j8 +``` + +* The result is a ghc-debug enabled compiler + +# Building a debugger + +* Use the compiler you just built to build ghc-debug + +``` +cd ghc-debug +cabal update +cabal new-build debugger -w ../_build/stage1/bin/ghc +``` + +# Running the debugger + +Modify `test/Test.hs` to implement the debugging thing you want to do. Perhaps +start with `p30`, which is a program to generate a profile. + + +* Start the process you want to debug +``` +GHC_DEBUG_SOCKET=/tmp/ghc-debug build-cabal +``` + +* Start the debugger +``` +cabal new-run debugger -w ... +``` + +* Open a ticket about the memory issue you find. + + |