Commit a7be1631 authored by Simon Marlow's avatar Simon Marlow Committed by Ben Gamari

Always build GHCi libs

Since the introduction of -split-sections, using GHCi with the RTS
linker is really slow:

```
$ time (echo :quit | ./inplace/bin/ghc-stage2 --interactive -fexternal-interpreter)
GHCi, version 8.1.20170304: http://www.haskell.org/ghc/  :? for help
Prelude> Leaving GHCi.

real        0m3.793s
```

(when we use `-fexternal-interpreter` it uses the RTS linker by default,
you can make it use the system linker by adding `-dynamic`)

Building the GHCi libs doesn't take much time or space in the GHC build,
but makes things much quicker for people using the RTS linker:

```
$ time (echo :quit | ./inplace/bin/ghc-stage2 --interactive -fexternal-interpreter)
GHCi, version 8.1.20170304: http://www.haskell.org/ghc/  :? for help
Prelude> Leaving GHCi.

real        0m0.285s
```

So I propose that we build and ship them unconditionally.

Test Plan: validate, perf tests above

Reviewers: bgamari, austin, niteria, erikd, Phyx

Reviewed By: bgamari

Subscribers: rwbarton, thomie, snowleopard

Differential Revision: https://phabricator.haskell.org/D3298
parent 899fb880
......@@ -32,11 +32,13 @@ endif
$1_$2_CONFIGURE_OPTS += --disable-library-for-ghci
ifeq "$$(filter v,$$($1_$2_WAYS))" "v"
$1_$2_CONFIGURE_OPTS += --enable-library-vanilla
# Build the GHCi lib even if GHCi is dynamic (and therefore won't use
# these by default), because they will be used by
# (a) ghci -fexternal-interpreter
# (b) statically-linked binaries that use the GHC package
ifeq "$$(GhcWithInterpreter)" "YES"
ifneq "$$(DYNAMIC_GHC_PROGRAMS)" "YES"
$1_$2_CONFIGURE_OPTS += --enable-library-for-ghci
endif
endif
else
$1_$2_CONFIGURE_OPTS += --disable-library-vanilla
endif
......
......@@ -143,9 +143,6 @@ endif
endif
# Build the GHCi library
ifeq "$$(DYNAMIC_GHC_PROGRAMS)" "YES"
$1_$2_GHCI_LIB = $$($1_$2_dyn_LIB)
else
ifeq "$3" "v"
$1_$2_GHCI_LIB = $1/$2/build/HS$$($1_$2_COMPONENT_ID).$$($3_osuf)
ifeq "$$($1_$2_BUILD_GHCI_LIB)" "YES"
......@@ -164,7 +161,6 @@ $(call all-target,$1_$2,$$($1_$2_GHCI_LIB))
endif
endif # "$$($1_$2_BUILD_GHCI_LIB)" "YES"
endif # "$3" "v"
endif # "$$(DYNAMIC_GHC_PROGRAMS)" "YES"
$(call profEnd, build-package-way($1,$2,$3))
endef # build-package-way
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment