Commit 1ee08bbe authored by sven.panne@aedion.de's avatar sven.panne@aedion.de

Use update-alternatives for handling generic tool names

ATTENTION: Packagers should read the following stuff carefully!

GHC, Hugs and nhc come with various tools like runhaskell or hsc2hs. On the
one hand this is quite handy, avoiding lots of tiny native packages, but OTOH
this leads to a few problems:

   * The tools are not always identical in functionality.

   * The tools fight for a global generic name like "/usr/bin/runhaskell".

These problems are not new and not unique to Haskell implementations, so for
*nix-based system there is a tool called update-alternatives which handles
those cases. The idea is as follows:

   * Each program/man page/etc. installs itself with a very specific name
     like /usr/bin/hsc2hs-ghc or /usr/share/man/man1/lua5.1.1.gz, so nothing
     clashes.

   * The (un-)installation scripts call update-alternatives to notify the
     system about new alternatives for a generic tool/manpage/etc.

   * Alternatives can be grouped together ("link groups"), so e.g. switching
     from Sun's Java to Kaffe switches compiler, JRE, manpages etc. together.
     Alas, this doesn't work well with the Haskell implementations yet,
     because they come with different sets of tools (in addition to runFOO):

       GHC:  hsc2hs
       Hugs: hsc2hs, cpphs
       nhc:  cpphs

     Either these tools should be disentangled fromt the Haskell
     implementations or all implementations should offer the same set.
     Opinions and recommendations on this topic are highly welcome.

   * This mechanism can be used to easily switch between several versions of
     the same implementation, too, but we are not yet fully prepared for that.

As a first step, GHC now installs hsc2hs as 'hsc2hs-ghc' and does *not*
install runhaskell directly anymore, only runghc. hsc2hs and runhaskell are
created via update-alternatives now. What is currently missing is a mechanism
for platforms like Windows and probably Mac OS X.
parent d4b95ea9
......@@ -206,7 +206,7 @@ install-docs ::
#
ifneq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
BinDistShScripts = ghc-$(ProjectVersion) ghci-$(ProjectVersion) ghc-pkg-$(ProjectVersion) hsc2hs
BinDistShScripts = ghc-$(ProjectVersion) ghci-$(ProjectVersion) ghc-pkg-$(ProjectVersion) hsc2hs-ghc
else
BinDistShScripts =
endif
......@@ -214,7 +214,6 @@ endif
BinDistPrlScripts = ghcprof
BinDistLibPrlScripts = ghc-asm ghc-split
BinDistBins = hp2ps runghc
BinDistOptBins = runhaskell
BinDistLinks = ghc ghci ghc-pkg
BinDistLibSplicedFiles = package.conf
BinDistDirs = includes compiler docs driver libraries rts utils
......
# RPM spec file for GHC -*-rpm-spec-*-
#
# Copyright [1998..2004] The GHC Team
# Copyright [1998..2007] The GHC Team
#
# Thanks to Zoltan Vorosbaranyi <vbzoli@vbzo.li> for suggestions in
# earlier versions and Pixel <pixel@mandrakesoft.com> for coding tips.
......@@ -21,8 +21,9 @@ Source0: http://haskell.org/ghc/dist/%{version}/ghc-%{version}-src.tar.bz
Source1: http://haskell.org/ghc/dist/%{version}/ghc-%{version}-src-extralibs.tar.bz2
Packager: Sven Panne <sven.panne@aedion.de>
BuildRoot: %{_tmppath}/%{name}-%{version}-build
PreReq: update-alternatives
Requires: gmp, readline
BuildRequires: alex >= 2.0, happy >= 1.15, ghc >= 5, haddock, docbook-dtd, docbook-xsl-stylesheets, libxslt, libxml2, fop, xmltex, dvips, gmp, readline-devel, mesaglut-devel
BuildRequires: update-alternatives, alex >= 2.0, happy >= 1.15, ghc >= 5, haddock, docbook-dtd, docbook-xsl-stylesheets, libxslt, libxml2, fop, xmltex, dvips, gmp, readline-devel, mesaglut-devel
Provides: haskell
Summary: The Glasgow Haskell Compiler
......@@ -113,6 +114,27 @@ cd $dir
%clean
rm -rf ${RPM_BUILD_ROOT}
%post
# Alas, GHC, Hugs and nhc all come with different set of tools in addition to
# a runFOO:
#
# * GHC: hsc2hs
# * Hugs: hsc2hs, cpphs
# * nhc: cpphs
#
# Therefore it is currently not possible to use --slave below to form link
# groups under a single name 'runhaskell'. Either these tools should be
# disentangled from the Haskell implementations or all implementations should
# have the same set of tools. *sigh*
update-alternatives --install %{_bindir}/runhaskell runhaskell %{_bindir}/runghc 500
update-alternatives --install %{_bindir}/hsc2hs hsc2hs %{_bindir}/hsc2hs-ghc 500
%preun
if test "$1" = 0; then
update-alternatives --remove runhaskell %{_bindir}/runghc
update-alternatives --remove hsc2hs %{_bindir}/hsc2hs-ghc
fi
%files -f rpm-noprof-lib-files
%defattr(-,root,root)
%doc docs/docbook-cheat-sheet/docbook-cheat-sheet
......@@ -137,9 +159,8 @@ rm -rf ${RPM_BUILD_ROOT}
%{_prefix}/bin/ghcprof
%{_prefix}/bin/hasktags
%{_prefix}/bin/hp2ps
%{_prefix}/bin/hsc2hs
%{_prefix}/bin/hsc2hs-ghc
%{_prefix}/bin/runghc
%{_prefix}/bin/runhaskell
%files prof -f rpm-prof-lib-files
%defattr(-,root,root)
......@@ -33,7 +33,7 @@ endif
SRC_HC_OPTS += -Wall
ifneq "$(HOSTPLATFORM)" "i386-unknown-mingw32"
INSTALLED_SCRIPT_PROG = hsc2hs
INSTALLED_SCRIPT_PROG = hsc2hs-ghc
endif
INPLACE_SCRIPT_PROG = hsc2hs-inplace
......
......@@ -15,18 +15,4 @@ include $(GHC_COMPAT_DIR)/compat.mk
# we must also build with $(GhcHcOpts) here:
SRC_HC_OPTS += $(GhcHcOpts) $(GhcStage1HcOpts)
all :: runhaskell
runhaskell : $(HS_PROG)
$(CP) $< runhaskell$(exeext)
CLEAN_FILES += runhaskell
# Only install runhaskell if there isn't already one installed
ifneq "$(findstring install, $(MAKECMDGOALS))" ""
ifeq "$(wildcard $(bindir)/runhaskell)" ""
INSTALL_PROGS += runhaskell$(exeext)
endif
endif
include $(TOP)/mk/target.mk
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