mk/haskell.mk: remove variable HASKELL_COMPILER, clean up documentation

There was only a single valid value for HASKELL_COMPILER, therefore the
variable was useless.  It only made the implementation more complicated
than necessary.

2 files changed, 38 insertions, 133 deletions

diff --git a/mk/defaults/mk.conf b/mk/defaults/mk.conf
index e98e0aa21ac..ec196a8f3e3 100644
--- a/mk/defaults/mk.conf
+++ b/mk/defaults/mk.conf
@@ -1,4 +1,4 @@
-# $NetBSD: mk.conf,v 1.311 2020/05/28 16:22:58 maya Exp $
+# $NetBSD: mk.conf,v 1.312 2020/07/01 14:58:43 rillig Exp $
 #
 
 # This file provides default values for variables that may be overridden
@@ -1070,12 +1070,6 @@ GAMEOWN?=	${GAMES_USER}
 # card at I/O offset 0x300.
 # Default: not defined
 
-HASKELL_COMPILER?=	ghc
-# Used by haskell.mk to determine which Haskell compiler should be
-# used for building Haskell packages.
-# Possible: ghc
-# Default: ghc
-
 HOWL_GROUP?= howl
 # System group to run howl's mDNS responder as.
 # Possible: any group name
diff --git a/mk/haskell.mk b/mk/haskell.mk
index 385e61cc47a..12bf54e40b5 100644
--- a/mk/haskell.mk
+++ b/mk/haskell.mk
@@ -1,94 +1,44 @@
-# $NetBSD: haskell.mk,v 1.25 2020/06/29 22:00:58 rillig Exp $
+# $NetBSD: haskell.mk,v 1.26 2020/07/01 14:58:43 rillig Exp $
 #
 # This Makefile fragment handles Haskell Cabal packages.
-# See: http://www.haskell.org/cabal/
+# Package configuration, building, installation, registration and
+# unregistration are fully automated.
+# See https://www.haskell.org/cabal/.
 #
-# Note to users:
-#
-#   * Users choose one favourite Haskell compiler. Though the only
-#     compiler currently supported is GHC.
-#
-#   * You can't install a cabal package for more than one compilers
-#     simultaneously. In the future, this limitation can possibly be
-#     eliminated using the method used by
-#     "../../lang/python/pyversion.mk".
-#
-# Note to package developers:
-#
-#   * This file must be included *before* "../../mk/bsd.pkg.mk", or
-#     you'll get target-redefinition errors.
+# Package-settable variables:
 #
-#   * PKGNAME will automatically be "hs-${DISTNAME}" unless you
-#     explicitly declare it.
+# PKGNAME
+#	Defaults to hs-${DISTNAME}.
 #
-#   * If your package is on the HackageDB, MASTER_SITES and HOMEPAGE
-#     can be omitted.
+# HOMEPAGE
+# MASTER_SITES
+#	Default to HackageDB URLs.
 #
-#   * Package configuration, building, installation, registration and
-#     unregistration are fully automated. You usually don't need to do
-#     anything special.
+# HASKELL_OPTIMIZATION_LEVEL
+#	Optimization level for compilation.
 #
-#   * When Haskell libraries depend on other Haskell libraries, they
-#     MUST depend on, not build-depend on, such libraries. So if your
-#     package installs a library, you MUST NOT set
-#     BUILDLINK_DEPMETHOD.${PKG} to "build" in your buildlink3.mk
-#     file. Reason:
-#         1. Assume we have two libraries A and B, and B build-depends
-#            on A.
-#         2. We install package A.
-#         3. We then install package B, which build-depends on A.
-#         4. After that, a new upstream version of package A is
-#            released. We therefore update package A to the new version.
-#         5. Package B had a build-dependency on A, so pkgsrc assumes
-#            that it's still safe to use package B without
-#            recompilation of B. But in fact package B requires the
-#            very version of package A which was available when
-#            package B was compiled. So the installed package B is
-#            completely broken at this time.
+#	Possible values: 0 1 2
+#       Default value: 2
 #
-# Package-settable variables:
+# User-settable variables:
 #
-#   HASKELL_OPTIMIZATION_LEVEL
-#       Description:
-#           Optimization level for compilation.
-#       Possible values:
-#           0 1 2
-#       Default value:
-#           2
+# HASKELL_ENABLE_SHARED_LIBRARY
+#	Whether shared library should be built or not.
 #
-# User-settable variables:
+#	Possible values: yes, no
+#       Default value: yes
 #
-#   HASKELL_COMPILER
-#       Description:
-#           The user's favourite Haskell compiler.
-#       Possible values:
-#           ghc
-#       Default value:
-#           ghc
+# HASKELL_ENABLE_LIBRARY_PROFILING
+#	Whether profiling library should be built or not.
 #
-#   HASKELL_ENABLE_SHARED_LIBRARY
-#       Description:
-#           Whether shared library should be built or not.
-#       Possible values:
-#           yes, no
-#       Default value:
-#           yes
+#	Possible values: yes, no
+#       Default value: yes
 #
-#   HASKELL_ENABLE_LIBRARY_PROFILING
-#       Description:
-#           Whether profiling library should be built or not.
-#       Possible values:
-#           yes, no
-#       Default value:
-#           yes
+# HASKELL_ENABLE_HADDOCK_DOCUMENTATION
+#	Whether haddock documentation should be built or not.
 #
-#   HASKELL_ENABLE_HADDOCK_DOCUMENTATION
-#       Description:
-#           Whether haddock documentation should be built or not.
-#       Possible values:
-#           yes, no
-#       Default value:
-#           yes
+#	Possible values: yes, no
+#       Default value: yes
 
 .if !defined(HASKELL_MK)
 HASKELL_MK=	# defined
@@ -97,14 +47,10 @@ HASKELL_MK=	# defined
 
 HS_UPDATE_PLIST?=	no
 
-# Declare HASKELL_COMPILER as one of BUILD_DEFS variables. See
-# ../../mk/misc/show.mk
-BUILD_DEFS+=	HASKELL_COMPILER
 BUILD_DEFS+=	HASKELL_ENABLE_SHARED_LIBRARY
 BUILD_DEFS+=	HASKELL_ENABLE_LIBRARY_PROFILING
 BUILD_DEFS+=	HASKELL_ENABLE_HADDOCK_DOCUMENTATION
 
-
 # Declarations for ../../mk/misc/show.mk
 _VARGROUPS+=	haskell
 _USER_VARS.haskell= \
@@ -117,13 +63,7 @@ _SYS_VARS.haskell= \
 _DEF_VARS.haskell= \
 	HASKELL_OPTIMIZATION_LEVEL \
 	HASKELL_PKG_NAME \
-	_DISTBASE \
-	_DISTVERSION \
-	_GHC_BIN \
-	_GHC_PKG_BIN \
-	_GHC_VERSION \
-	_GHC_VERSION_CMD \
-	_GHC_VERSION_FULL \
+	_HASKELL_VERSION_CMD \
 	_HASKELL_BIN \
 	_HASKELL_PKG_BIN \
 	_HASKELL_PKG_DESCR_FILE \
@@ -132,16 +72,9 @@ _DEF_VARS.haskell= \
 _IGN_VARS.haskell= \
 	USE_TOOLS _*
 
-# PKGNAME is usually named after DISTNAME.
 PKGNAME?=	hs-${DISTNAME}
-
-# Default value of MASTER_SITES.
-_DISTBASE?=	${DISTNAME:C/-[^-]*$//}
-_DISTVERSION?=	${DISTNAME:C/^.*-//}
 MASTER_SITES?=	${MASTER_SITE_HASKELL_HACKAGE:=${DISTNAME}/}
-
-# Default value of HOMEPAGE.
-HOMEPAGE?=	http://hackage.haskell.org/package/${_DISTBASE}
+HOMEPAGE?=	http://hackage.haskell.org/package/${DISTNAME:C/-[^-]*$//}
 
 # Cabal packages may use pkg-config, but url2pkg can't detect
 # that. (PHO: I think that should be handled by url2pkg (2009-05-20))
@@ -150,71 +83,49 @@ USE_TOOLS+=	pkg-config
 # GHC can be a memory hog, so don't apply regular limits.
 UNLIMIT_RESOURCES+=	datasize virtualsize
 
-# Default value of HASKELL_OPTIMIZATION_LEVEL
 HASKELL_OPTIMIZATION_LEVEL?=		2
-
-# Default value of HASKELL_ENABLE_SHARED_LIBRARY
 HASKELL_ENABLE_SHARED_LIBRARY?=		yes
-
-# Default value of HASKELL_ENABLE_LIBRARY_PROFILING
 HASKELL_ENABLE_LIBRARY_PROFILING?=	yes
-
-# Default value of HASKELL_ENABLE_HADDOCK_DOCUMENTATION
 HASKELL_ENABLE_HADDOCK_DOCUMENTATION?=	yes
 
-# Compiler specific variables and targets.
-.if ${HASKELL_COMPILER} == "ghc"
-
-# Add dependency on GHC.
 .include "../../lang/ghc88/buildlink3.mk"
 
 # Tools
-_GHC_BIN=		${BUILDLINK_PREFIX.ghc:U${PREFIX}}/bin/ghc
-_GHC_PKG_BIN=		${BUILDLINK_PREFIX.ghc:U${PREFIX}}/bin/ghc-pkg
-_HASKELL_BIN=		${_GHC_BIN} # Expose to the outer scope.
-_HASKELL_PKG_BIN=	${_GHC_PKG_BIN} # Expose to the outer scope.
+_HASKELL_BIN=		${BUILDLINK_PREFIX.ghc:U${PREFIX}}/bin/ghc
+_HASKELL_PKG_BIN=	${BUILDLINK_PREFIX.ghc:U${PREFIX}}/bin/ghc-pkg
 
-# Determine GHC version.
-_GHC_VERSION_CMD=	${_GHC_BIN} -V 2>/dev/null | ${CUT} -d ' ' -f 8
-_GHC_VERSION=		${_GHC_VERSION_CMD:sh}
-_GHC_VERSION_FULL=	ghc-${_GHC_VERSION}
-_HASKELL_VERSION=	${_GHC_VERSION_FULL} # Expose to the outer scope.
+_HASKELL_VERSION_CMD=	${_HASKELL_BIN} -V 2>/dev/null | ${CUT} -d ' ' -f 8
+_HASKELL_VERSION=	ghc-${_HASKELL_VERSION_CMD:sh}
 
 # Determine GHC shlib suffix
-_GHC_SHLIB_SUFFIX.dylib=	dylib
-_GHC_SHLIB_SUFFIX=		${_GHC_SHLIB_SUFFIX.${SHLIB_TYPE}:Uso}
-_HASKELL_SHLIB_SUFFIX=		${_GHC_SHLIB_SUFFIX}
+_HASKELL_SHLIB_SUFFIX.dylib=	dylib
+_HASKELL_SHLIB_SUFFIX=		${_HASKELL_SHLIB_SUFFIX.${SHLIB_TYPE}:Uso}
 
 # GHC requires C compiler.
 USE_LANGUAGES+=	c
 
 # Declarations for ../../mk/configure/configure.mk
 CONFIGURE_ARGS+=	--ghc
-CONFIGURE_ARGS+=	--with-compiler=${_GHC_BIN:Q}
-CONFIGURE_ARGS+=	--with-hc-pkg=${_GHC_PKG_BIN:Q}
+CONFIGURE_ARGS+=	--with-compiler=${_HASKELL_BIN:Q}
+CONFIGURE_ARGS+=	--with-hc-pkg=${_HASKELL_PKG_BIN:Q}
 CONFIGURE_ARGS+=	--prefix=${PREFIX:Q}
-.endif # ${HASKELL_COMPILER}
 
-# Shared libraries
 .if ${HASKELL_ENABLE_SHARED_LIBRARY} == "yes"
 CONFIGURE_ARGS+=	--enable-shared --enable-executable-dynamic
 .else
 CONFIGURE_ARGS+=	--disable-shared --disable-executable-dynamic
 .endif
 
-# Library profiling
 .if ${HASKELL_ENABLE_LIBRARY_PROFILING} == "yes"
 CONFIGURE_ARGS+=	--enable-library-profiling
 .else
 CONFIGURE_ARGS+=	--disable-library-profiling
 .endif
 
-# Haddock documentations
 .if ${HASKELL_ENABLE_HADDOCK_DOCUMENTATION} == "yes"
 CONFIGURE_ARGS+=	--with-haddock=${BUILDLINK_PREFIX.ghc:Q}/bin/haddock
 .endif
 
-# Optimization
 CONFIGURE_ARGS+=	-O${HASKELL_OPTIMIZATION_LEVEL}
 
 .if !exists(${PKGDIR}/PLIST)