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# $NetBSD: options.mk,v 1.1 2022/02/06 05:36:15 pho Exp $
PKG_OPTIONS_VAR= PKG_OPTIONS.ghc
.include "../../mk/bsd.prefs.mk"
# GHC has a native implementation of codegen (NCG) for some platforms. On
# those platforms LLVM is optional. It's a requirement anywhere else. See
# compiler/GHC/Driver/Backend.hs
#
# The LLVM backend tends to produce slightly faster code than what NCG
# produces, but it is much slower than NCG. It is therefore not the default
# backend on platforms where NCG is available. On platforms where NCG is
# available, LLVM should be disabled by default because it's a huge
# dependency that takes hours to compile.
#
# Note that bootkits also require LLVM/Clang on platforms lacking NCG. This
# can cause a transitional problem when a new compiler arrives with NCG for
# a platform which used to lack one. In this case we have to either (1)
# build a new bootkit for the platform with LLVM backend disabled, or (2)
# reuse the old bootkit by putting llvm/clang in BUILD_DEPENDS (regardless
# of user choice) and arrange parameters so that they are used only by the
# stage-0 compiler. We don't have an infrastructure for (2), as it's not
# worth the additional complexity, so (1) is the only option atm.
GHC_NCG_SUPPORTED= aarch64 i386 x86_64 powerpc powerpc64 sparc
.if !empty(GHC_NCG_SUPPORTED:M${MACHINE_ARCH})
PKG_SUPPORTED_OPTIONS+= llvm
GHC_LLVM_REQUIRED= no
.else
GHC_LLVM_REQUIRED= yes
.endif
.if !empty(PKG_SUPPORTED_OPTIONS)
. include "../../mk/bsd.options.mk"
.endif
.if !empty(PKG_OPTIONS:Mllvm) || ${GHC_LLVM_REQUIRED} == "yes"
DEPENDS+= llvm-[0-9]*:../../lang/llvm
CONFIGURE_ARGS.common+= LLC=${PREFIX:Q}/bin/llc
CONFIGURE_ARGS.common+= OPT=${PREFIX:Q}/bin/opt
# When we use the LLVM backend, we *have* to use Clang's integrated
# assembler because llc emits assembly source files incompatible with
# Binutils < 2.36 (see https://reviews.llvm.org/D97448). It also requires
# Clang on Darwin (see runClang in compiler/GHC/SysTools/Tasks.hs).
DEPENDS+= clang-[0-9]*:../../lang/clang
CONFIGURE_ARGS.common+= CLANG=${PREFIX:Q}/bin/clang
CONFIGURE_ARGS.common+= CC=${PREFIX:Q}/bin/clang
# Maybe GHC doesn't like this but it's the only option available to us.
LLVM_VERSION_CMD= ${PKG_INFO} -E llvm | ${SED} -E 's/^llvm-([0-9]*)\..*/\1/'
LLVM_MAX_VERSION_CMD= ${EXPR} ${LLVM_VERSION_CMD:sh} + 1
SUBST_CLASSES+= llvm
SUBST_STAGE.llvm= post-extract
SUBST_MESSAGE.llvm= Modifying configure.ac to accept whichever version of LLVM installed via pkgsrc
SUBST_FILES.llvm= configure.ac
SUBST_SED.llvm= -e 's/LlvmMaxVersion=[0-9]*/LlvmMaxVersion=${LLVM_MAX_VERSION_CMD:sh}/'
.else
CONFIGURE_ARGS.common+= LLC=${FALSE:Q}
CONFIGURE_ARGS.common+= OPT=${FALSE:Q}
CONFIGURE_ARGS.common+= CLANG=${FALSE:Q}
CONFIGURE_ARGS.common+= CC=${CC:Q}
.endif
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