Recompiling ghc-5.00 with itself on my debian linux box, failed pretty
early for me when generating dependencies in ghc/compiler. It seems
that my build of hslibs/*/Readline had (silently?) failed while
building ghc 5.0 with my old compiler and so dependency generation
failed.
Obviously, this is easy enough to fix - just install readline header
files on my machine but I thought I'd try to find a way that made ghc
more portable.
The first thing I tried was tweaking the setting of HS_SRCS in the
Makefile to include the ghci directory only if ghci was enabled. This
worked but... what if I wanted to run ghci?
I then found that autoconf had checked to see if readline/readline.h
was installed - all I had to do was tweak ghci to pay attention to
HAVE_READLINE_HEADERS and I'd be golden. This also works - diffs
attached. (Note that this patch removes the "NO_READLINE" flag - you
might want to keep this?)
A third solution which I haven't tried yet but might try soon is to
write a dumb (possibly very dumb) implementation of Readline in pure
Haskell and have Readline use the dumb implementation if the C library
and headers aren't available. I'm in two minds about this approach
because the semantics of my dumb version would be a fairly poor match
for the semantics of the real thing.
--
Alastair Reid
$ cvs diff -C2
cvs server: Diffing .
Index: InteractiveUI.hs
===================================================================
RCS file: /home/cvs/root/fptools/ghc/compiler/ghci/InteractiveUI.hs,v
retrieving revision 1.60
diff -C2 -r1.60 InteractiveUI.hs
*** InteractiveUI.hs 2001/03/28 16:51:03 1.60
--- InteractiveUI.hs 2001/04/20 23:22:20
***************
*** 29,33 ****
import Exception
import Dynamic
! #ifndef NO_READLINE
import Readline
#endif
--- 29,33 ----
import Exception
import Dynamic
! #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
import Readline
#endif
***************
*** 122,126 ****
Just m -> cmLoadModule cmstate m
! #ifndef NO_READLINE
Readline.initialize
#endif
--- 122,126 ----
Just m -> cmLoadModule cmstate m
! #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
Readline.initialize
#endif
***************
*** 167,171 ****
-- read commands from stdin
! #ifndef NO_READLINE
readlineLoop
#else
--- 167,171 ----
-- read commands from stdin
! #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
readlineLoop
#else
***************
*** 201,205 ****
if quit then return () else stringLoop ss
! #ifndef NO_READLINE
readlineLoop :: GHCi ()
readlineLoop = do
--- 201,205 ----
if quit then return () else stringLoop ss
! #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
readlineLoop :: GHCi ()
readlineLoop = do
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