#-*- tab-width: 4; -*-
# ex:ts=4
#
# bsd.gcc.mk - Support for smarter USE_GCC usage.
#
# Created by: Edwin Groothuis <edwin@freebsd.org>
#
# To request the use of a current version of GCC, specify USE_GCC=yes in
# your port/system configuration.  This is the preferred use of USE_GCC.
# It uses the canonical version of GCC defined in bsd.default-versions.mk.
#
# USE_GCC=any is similar, except that it also accepts the old GCC 4.2-
# based system compiler where still present.
# 
# If your port needs a specific (minimum) version of GCC, you can easily
# specify that with a USE_GCC= statement.  Unless absolutely necessary
# do so by specifying USE_GCC=X+ which requests at least GCC version X.
# To request a specific version omit the trailing + sign.
#
# Examples:
#   USE_GCC=	yes			# port requires a current version of GCC
#							# as defined in bsd.default-versions.mk.
#   USE_GCC=	any			# port requires GCC 4.2 or later.
#   USE_GCC=	9+			# port requires GCC 9 or later.
#   USE_GCC=	8			# port requires GCC 8.
#
# If you are wondering what your port exactly does, use "make test-gcc"
# to see some debugging.
#
# $FreeBSD$

GCC_Include_MAINTAINER=		gerald@FreeBSD.org

# All GCC versions supported by this framework.
#
# When updating this, keep Mk/bsd.default-versions.mk in sync.
GCCVERSIONS=	4.8 7 8 9 10 11

# No configurable parts below this. ####################################
#

.if defined(USE_GCC) && !defined(FORCE_BASE_CC_FOR_TESTING)

.if ${USE_GCC} == any && exists(/usr/bin/gcc)
CC:=		gcc
CXX:=		g++
. if exists(/usr/bin/gcpp)
CPP:=		gcpp
. else
CPP:=		cpp
. endif
.else # The regular approach, not using the age-old base compiler.

# Handle USE_GCC=yes and USE_GCC=any.
.if ${USE_GCC} == yes || ${USE_GCC} == any
USE_GCC=	${GCC_DEFAULT}+
.endif

# See if we can use a later version or exclusively the one specified.
_USE_GCC:=	${USE_GCC:S/+//}
.if ${USE_GCC} != ${_USE_GCC}
_GCC_ORLATER:=	true
.endif

# See whether we have the specific version requested installed already
# and save that into _GCC_FOUND.  In parallel, check if USE_GCC refers
# to a valid version to begin with.
.for v in ${GCCVERSIONS}
. if ${_USE_GCC} == ${v}
_GCCVERSION_OKAY=	true
.  if exists(${LOCALBASE}/bin/gcc${v:S/.//})
_GCC_FOUND:=		${_USE_GCC}
.  endif
. endif
.endfor

.if !defined(_GCCVERSION_OKAY)
IGNORE=	Unknown version of GCC specified (USE_GCC=${USE_GCC})
.endif

# If the GCC package defined in USE_GCC does not exist, but a later
# version is allowed (for example 8+), go and use the default.
.if defined(_GCC_ORLATER)
. if !defined(_GCC_FOUND) && ${_USE_GCC} < ${GCC_DEFAULT}
_USE_GCC:=	${GCC_DEFAULT}
. endif
.endif # defined(_GCC_ORLATER)

# A concrete version has been selected. Set proper ports dependencies,
# CC, CXX, CPP, and flags.
V:=			${_USE_GCC:S/.//}
. if ${V} == 11
_GCC_PORT:=		gcc${V}-devel
. else
_GCC_PORT:=		gcc${V}
. endif
CC:=			gcc${V}
CXX:=			g++${V}
CPP:=			cpp${V}
_GCC_RUNTIME:=		${LOCALBASE}/lib/gcc${V}
. if ${PORTNAME} == gcc
# We don't want the rpath stuff while building GCC itself
# so we do not set the FLAGS as done in the else part.
# When building a GCC, we want the target libraries to be used and not the
# host GCC libraries.
. else
CFLAGS+=		-Wl,-rpath=${_GCC_RUNTIME}
CXXFLAGS+=		-Wl,-rpath=${_GCC_RUNTIME}
LDFLAGS+=		-Wl,-rpath=${_GCC_RUNTIME} -L${_GCC_RUNTIME}
. endif
.undef V

# Now filter unsupported flags for CC and CXX.
CFLAGS:=		${CFLAGS:N-mretpoline}
CXXFLAGS:=		${CXXFLAGS:N-mretpoline}

.if defined(_GCC_PORT)
BUILD_DEPENDS+=	${CC}:lang/${_GCC_PORT}
RUN_DEPENDS+=	${CC}:lang/${_GCC_PORT}
# GCC ports already depend on binutils; make sure whatever we build
# leverages this as well.
USE_BINUTILS=	yes
.endif

.endif # USE_GCC=any

.endif # defined(_USE_GCC) && !defined(FORCE_BASE_CC_FOR_TESTING)


test-gcc:
	@echo USE_GCC=${USE_GCC}
.if defined(IGNORE)
	@echo "IGNORE: ${IGNORE}"
.else
.if defined(USE_GCC)
.if defined(_GCC_ORLATER)
	@echo Port can use later versions.
.else
	@echo Port cannot use later versions.
.endif
	@echo Using GCC version ${_USE_GCC}
.endif
	@echo CC=${CC} - CXX=${CXX} - CPP=${CPP}
	@echo CFLAGS=\"${CFLAGS}\"
	@echo CXXFLAGS=\"${CXXFLAGS}\"
	@echo LDFLAGS=\"${LDFLAGS}\"
	@echo "BUILD_DEPENDS=${BUILD_DEPENDS}"
	@echo "RUN_DEPENDS=${RUN_DEPENDS}"
.endif