# $FreeBSD$

# Setup variables for the compiler
#
# COMPILER_TYPE is the major type of compiler. Currently gcc and clang support
# automatic detection. Other compiler types can be shoe-horned in, but require
# explicit setting of the compiler type. The compiler type can also be set
# explicitly if, say, you install gcc as clang...
#
# COMPILER_VERSION is a numeric constant equal to:
#     major * 10000 + minor * 100 + tiny
# It too can be overriden on the command line. When testing it, be sure to
# make sure that you are limiting the test to a specific compiler. Testing
# against 30300 for gcc likely isn't  what you wanted (since versions of gcc
# prior to 4.2 likely have no prayer of working).
#
# COMPILER_FEATURES will contain one or more of the following, based on
# compiler support for that feature:
#
# - c++11 : supports full (or nearly full) C++11 programming environment.
#
# This file may be included multiple times, but only has effect the first time.
#

.if !target(__<bsd.compiler.mk>__)
__<bsd.compiler.mk>__:

# Try to import COMPILER_TYPE and COMPILER_VERSION from parent make.
# The value is only used/exported for the same environment that impacts
# CC and COMPILER_* settings here.
_exported_vars=	COMPILER_TYPE COMPILER_VERSION
_cc_hash=	${CC}${MACHINE}${PATH}
_cc_hash:=	${_cc_hash:hash}
# Only import if none of the vars are set somehow else.
_can_export=	yes
.for var in ${_exported_vars}
.if defined(${var})
_can_export=	no
.endif
.endfor
.if ${_can_export} == yes
.for var in ${_exported_vars}
.if defined(${var}.${_cc_hash})
${var}=	${${var}.${_cc_hash}}
.endif
.endfor
.endif

.if ${MACHINE} == "common"
# common is a pseudo machine for architecture independent
# generated files - thus there is no compiler.
COMPILER_TYPE= none
COMPILER_VERSION= 0
.elif !defined(COMPILER_TYPE) || !defined(COMPILER_VERSION)
_v!=	${CC} --version 2>/dev/null || echo 0.0.0

.if !defined(COMPILER_TYPE)
. if ${CC:T:M*gcc*}
COMPILER_TYPE:=	gcc  
. elif ${CC:T:M*clang*}
COMPILER_TYPE:=	clang
. elif ${_v:Mgcc}
COMPILER_TYPE:=	gcc
. elif ${_v:M\(GCC\)}
COMPILER_TYPE:=	gcc
. elif ${_v:Mclang}
COMPILER_TYPE:=	clang
. else
.error Unable to determine compiler type for ${CC}.  Consider setting COMPILER_TYPE.
. endif
.endif
.if !defined(COMPILER_VERSION)
COMPILER_VERSION!=echo ${_v:M[1-9].[0-9]*} | awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
.endif
.undef _v
.endif

# Export the values so sub-makes don't have to look them up again, using the
# hash key computed above.
.for var in ${_exported_vars}
${var}.${_cc_hash}:=	${${var}}
.export-env ${var}.${_cc_hash}
.undef ${var}.${_cc_hash}
.endfor

.if ${COMPILER_TYPE} == "clang" || \
	(${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 40800)
COMPILER_FEATURES=	c++11
.else
COMPILER_FEATURES=
.endif

.endif	# !target(__<bsd.compiler.mk>__)