# $FreeBSD$
#
# Allows to determine the compiler being used
#
# Feature:	compiler
# Usage:	USES=compiler or USES=compiler:ARGS
# Valid ARGS:	env (default, implicit) c++0x c++11-lib c++11-lang c11 openmp nestedfct features
#
# c++0x:	The port needs a compiler understanding C++0X
# c++11-lang:	The port needs a compiler understanding C++11
# c++14-lang:	The port needs a compiler understanding C++14
# gcc-c++11-lib:The port needs g++ compiler with a C++11 library
# c++11-lib:	The port needs a compiler understanding C++11 and with a C++11 ready standard library
# c11:		The port needs a compiler understanding C11
# openmp:	The port needs a compiler understanding openmp
# nestedfct:	The port needs a compiler understanding nested functions
# features:	The port will determine the features supported by the default compiler
#
# Variable to test after <bsd.port.pre.mk>
#
# COMPILER_TYPE:	can be gcc or clang
# ALT_COMPILER_TYPE:	can be gcc or clang depending on COMPILER_TYPE, only set if the base system has 2 compilers
# COMPILER_VERSION:	first 2 digits of the version: 33 for clang 3.3.*, 47 for gcc 4.7.*
# ALT_COMPILER_VERSION:	first 2 digits of the version: 33 for clang 3.3.*, 47 for gcc 4.7.* of the ALT_COMPILER_TYPE
#
# COMPILER_FEATURES:	the list of features supported by the compiler includes the standard C++ library.
# CHOSEN_COMPILER_TYPE:	can be gcc or clang (type of compiler chosen by the framework)
#
# MAINTAINER: portmgr@FreeBSD.org

.if !defined(_INCLUDE_USES_COMPILER_MK)
_INCLUDE_USES_COMPILER_MK=	yes

.if empty(compiler_ARGS)
compiler_ARGS=	env
.endif

VALID_ARGS=	c++11-lib c++11-lang c++14-lang c11 features openmp env nestedfct c++0x gcc-c++11-lib

.if ${compiler_ARGS} == gcc-c++11-lib
_COMPILER_ARGS+=	features gcc-c++11-lib
.elif ${compiler_ARGS} == c++11-lib
_COMPILER_ARGS+=	features c++11-lib
.elif ${compiler_ARGS} == c++0x
_COMPILER_ARGS+=	features c++0x
.elif ${compiler_ARGS} == c++11-lang
_COMPILER_ARGS+=	features c++11-lang
.elif ${compiler_ARGS} == c++14-lang
_COMPILER_ARGS+=	features c++14-lang
.elif ${compiler_ARGS} == c11
_COMPILER_ARGS+=	features c11
.elif ${compiler_ARGS} == features
_COMPILER_ARGS+=	features
.elif ${compiler_ARGS} == env
_COMPILER_ARGS+=	env
.elif ${compiler_ARGS} == openmp
_COMPILER_ARGS+=	env openmp
.elif ${compiler_ARGS} == nestedfct
_COMPILER_ARGS+=	env nestedfct
.else
IGNORE=	Invalid argument "${compiler_ARGS}", valid arguments are: ${VALID_ARGS}
_COMPILER_ARGS=	#
.endif

.if ${_COMPILER_ARGS:Mc++*} || ${_COMPILER_ARGS:Mc11}
_COMPILER_ARGS+=	features
.endif

_CCVERSION!=	${CC} --version
COMPILER_VERSION=	${_CCVERSION:M[0-9].[0-9]*:tW:C/([0-9]).([0-9]).*/\1\2/g}
.if ${_CCVERSION:Mclang}
COMPILER_TYPE=	clang
.else
COMPILER_TYPE=	gcc
.endif

ALT_COMPILER_VERSION=	0
ALT_COMPILER_TYPE=	none
_ALTCCVERSION=	
.if ${COMPILER_TYPE} == gcc && exists(/usr/bin/clang)
.if ${ARCH} == amd64 || ${ARCH} == i386 # clang often non-default for a reason
_ALTCCVERSION!=	/usr/bin/clang --version
.endif
.elif ${COMPILER_TYPE} == clang && exists(/usr/bin/gcc)
_ALTCCVERSION!=	/usr/bin/gcc --version
.endif

ALT_COMPILER_VERSION=	${_ALTCCVERSION:M[0-9].[0-9]*:tW:C/([0-9]).([0-9]).*/\1\2/g}
.if ${_ALTCCVERSION:Mclang}
ALT_COMPILER_TYPE=	clang
.elif !empty(_ALTCCVERSION)
ALT_COMPILER_TYPE=	gcc
.endif

CHOSEN_COMPILER_TYPE=	${COMPILER_TYPE}

.if ${_COMPILER_ARGS:Mopenmp}
.if ${COMPILER_TYPE} == clang
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.endif
.endif

.if ${_COMPILER_ARGS:Mnestedfct}
.if ${COMPILER_TYPE} == clang
USE_GCC=	any
CHOSEN_COMPILER_TYPE=	gcc
.endif
.endif

.if ${_COMPILER_ARGS:Mfeatures}
_CXXINTERNAL!=	${CXX} -\#\#\# /dev/null 2>&1
.if ${_CXXINTERNAL:M\"-lc++\"}
COMPILER_FEATURES=	libc++
.else
COMPILER_FEATURES=	libstdc++
.endif

CSTD=	c89 c99 c11 gnu89 gnu99 gnu11
CXXSTD=	c++98 c++0x c++11 c++14 gnu++98 gnu++11

.for std in ${CSTD} ${CXXSTD}
_LANG=c
.if ${CXXSTD:M${std}}
_LANG=c++
.endif
OUTPUT_${std}!=	echo | ${CC} -std=${std} -c -x ${_LANG} /dev/null -o /dev/null 2>&1; echo
.if !${OUTPUT_${std}:M*error*}
COMPILER_FEATURES+=	${std}
.endif
.endfor
.endif

.if ${_COMPILER_ARGS:Mc++11-lib}
.if !${COMPILER_FEATURES:Mc++11}
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.elif ${COMPILER_TYPE} == clang && ${COMPILER_FEATURES:Mlibstdc++}
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.endif
.endif

.if ${_COMPILER_ARGS:Mc++14-lang}
.if !${COMPILER_FEATURES:Mc++14}
.if (defined(FAVORITE_COMPILER) && ${FAVORITE_COMPILER} == gcc) || (${ARCH} != amd64 && ${ARCH} != i386) # clang not always supported on Tier-2
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.elif (${COMPILER_TYPE} == clang && ${COMPILER_VERSION} < 35) || ${COMPILER_TYPE} == gcc
.if ${ALT_COMPILER_TYPE} == clang && ${ALT_COMPILER_VERSION} >= 35
CPP=	clang-cpp
CC=	clang
CXX=	clang++
CHOSEN_COMPILER_TYPE=	clang
.else
BUILD_DEPENDS+=	${LOCALBASE}/bin/clang40:devel/llvm40
CPP=	${LOCALBASE}/bin/clang-cpp40
CC=	${LOCALBASE}/bin/clang40
CXX=	${LOCALBASE}/bin/clang++40
CHOSEN_COMPILER_TYPE=	clang
.endif
.endif
.endif
.endif

.if ${_COMPILER_ARGS:Mc++11-lang}
.if !${COMPILER_FEATURES:Mc++11}
.if (defined(FAVORITE_COMPILER) && ${FAVORITE_COMPILER} == gcc) || (${ARCH} != amd64 && ${ARCH} != i386) # clang not always supported on Tier-2
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.elif ${COMPILER_TYPE} == gcc
.if ${ALT_COMPILER_TYPE} == clang
CPP=	clang-cpp
CC=	clang
CXX=	clang++
CHOSEN_COMPILER_TYPE=	clang
.else
BUILD_DEPENDS+=	${LOCALBASE}/bin/clang34:lang/clang34
CPP=	${LOCALBASE}/bin/clang-cpp34
CC=	${LOCALBASE}/bin/clang34
CXX=	${LOCALBASE}/bin/clang++34
CHOSEN_COMPILER_TYPE=	clang
.endif
.endif
.endif
.endif

.if ${_COMPILER_ARGS:Mc++0x}
.if !${COMPILER_FEATURES:Mc++0x}
.if (defined(FAVORITE_COMPILER) && ${FAVORITE_COMPILER} == gcc) || (${ARCH} != amd64 && ${ARCH} != i386) # clang not always supported on Tier-2
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.elif ${COMPILER_TYPE} == gcc
.if ${ALT_COMPILER_TYPE} == clang
CPP=	clang-cpp
CC=	clang
CXX=	clang++
CHOSEN_COMPILER_TYPE=	clang
.else
BUILD_DEPENDS+=	${LOCALBASE}/bin/clang34:lang/clang34
CHOSEN_COMPILER_TYPE=	clang
CPP=	${LOCALBASE}/bin/clang-cpp34
CC=	${LOCALBASE}/bin/clang34
CXX=	${LOCALBASE}/bin/clang++34
.endif
.endif
.endif
.endif

.if ${_COMPILER_ARGS:Mc11}
.if !${COMPILER_FEATURES:Mc11}
.if (defined(FAVORITE_COMPILER) && ${FAVORITE_COMPILER} == gcc) || (${ARCH} != amd64 && ${ARCH} != i386) # clang not always supported on Tier-2
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.elif ${COMPILER_TYPE} == gcc
.if ${ALT_COMPILER_TYPE} == clang
CPP=	clang-cpp
CC=	clang
CXX=	clang++
CHOSEN_COMPILER_TYPE=	clang
.else
BUILD_DEPENDS+=	${LOCALBASE}/bin/clang34:lang/clang34
CHOSEN_COMPILER_TYPE=	clang
CPP=	${LOCALBASE}/bin/clang-cpp34
CC=	${LOCALBASE}/bin/clang34
CXX=	${LOCALBASE}/bin/clang++34
.endif
.endif
.endif
.endif

.if ${_COMPILER_ARGS:Mgcc-c++11-lib}
USE_GCC=	yes
CHOSEN_COMPILER_TYPE=	gcc
.if ${COMPILER_FEATURES:Mlibc++}
CXXFLAGS+=	-nostdinc++ -isystem /usr/include/c++/v1
LDFLAGS+=	-L${WRKDIR}

_USES_configure+=	200:gcc-libc++-configure
gcc-libc++-configure:
	@${LN} -fs /usr/lib/libc++.so ${WRKDIR}/libstdc++.so
.endif
.endif

.endif