New USES=compiler

Supported arguments are:
  - c++11-lang: the port needs a c++11 aware compiler what ever standard
  library it uses, implies features
  - c++11-lib: the port needs a c++11 standard library, implies features
  - c11: the ports needs a c11 aware compiler implies features
  - features: this will create a COMPILER_FEATURES variable which contains
  the list of features ${CC} do support, implies env.
  - env: the COMPILER_TYPE will be set to either gcc or clang.

  By default the uses will try to use clang33 from ports when nothing in
  base is relevant except if the user explicitly defines
  FAVORITE_COMPILER=gcc in his make.conf

Please note that testing tinderbox prior to version: 4.0.1_1 is not able to
properly figure out the dependencies implied by this USES.

1 files changed, 116 insertions, 0 deletions

diff --git a/Mk/Uses/compiler.mk b/Mk/Uses/compiler.mk
new file mode 100644
index 000000000000..dee4aa4522f3
--- /dev/null
+++ b/Mk/Uses/compiler.mk
@@ -0,0 +1,116 @@
+# $FreeBSD$
+#
+# Allows to feature determine the compiler used
+#
+# MAINTAINER: portmgr@FreeBSD.org
+#
+# Feature:	compiler
+# Usage:	USES=compiler or USES=compiler:ARGS
+# Valid ARGS:	env (default, implicit) c++11-lib c++11-lang c11 features
+#
+# c++11-lang:	The port need a compiler understanding C++11
+# c++11-lib:	The port need a compiler understanding C++11 and with a C++11 ready standard library
+# c11:		The port need a compiler understanding c11
+# 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
+# COMPILER_VERSION:	2 first digit of the version: 33 for clang 3.3.*, 46 for gcc 4.6.*
+#
+# COMPILER_FEATURES:	the list of features supported by the compiler include the standard C++ library.
+
+.if !defined(_INCLUDE_USES_COMPILER_MK)
+_INCLUDE_USES_COMPILER_MK=	yes
+
+.if !defined(compiler_ARGS)
+compiler_ARGS=	env
+.endif
+
+VALID_ARGS=	c++11-lib c++11-lang c11 features env
+
+.if ${compiler_ARGS} == c++11-lib
+_COMPILER_ARGS+=	features c++11-lib
+.elif ${compiler_ARGS} == c++11-lang
+_COMPILER_ARGS+=	features c++11-lang
+.elif ${compiler_ARGS} == c11
+_COMPILER_ARGS+=	features c11
+.elif ${compiler_ARGS} == features
+_COMPILER_ARGS+=	features
+.elif ${compiler_ARGS} == env
+_COMPILER_ARGS+=	env
+.else
+IGNORE=	Invalid argument "${compiler_ARGS}", valid arguments are: ${VALID_ARGS}
+_COMPILER_ARGS=	#
+.endif
+
+.if ${_COMPILER_ARGS:Mc++11*} || ${_COMPILER_ARGS:Mc11}
+_COMPILER_ARGS+=	features
+.endif
+
+_CCVERSION!=	${CC} --version
+COMPILER_VERSION=	${_CCVERSION:M[0-9].[0-9]*:C/([0-9]).([0-9]).*/\1\2/g}
+.if ${_CCVERSION:Mclang}
+COMPILER_TYPE=	clang
+.elif ${_CCVERSION:Mgcc*} || ${_CCVERSION:M\(GCC\)}
+COMPILER_TYPE=	gcc
+.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++11 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-lang}
+USE_GCC=	yes
+.elif ${COMPILER_TYPE} == clang && ${COMPILER_FEATURES:Mc++11-lib}
+USE_GCC=	yes
+.endif
+.endif
+
+.if ${_COMPILER_ARGS:Mc++11-lang}
+.if !${COMPILER_FEATURES:Mc++11}
+.if defined(FAVORITE_COMPILER) && ${FAVORITE_COMPILER} == gcc
+USE_GCC=	yes
+.elif (${COMPILER_TYPE} == clang && ${COMPILER_VERSION} < 33) || ${COMPILER_TYPE} == gcc
+BUILD_DEPENDS+=	${LOCALBASE}/bin/clang33:${PORTSDIR}/lang/clang33
+CPP=	${LOCALBASE}/bin/clang-cpp33
+CC=	${LOCALBASE}/bin/clang33
+CXX=	${LOCALBASE}/bin/clang++33
+.endif
+.endif
+.endif
+
+.if ${_COMPILER_ARGS:Mc11}
+.if !${COMPILER_FEATURES:Mc11}
+.if defined(FAVORITE_COMPILER) && ${FAVORITE_COMPILER} == gcc
+USE_GCC=	yes
+.elif (${COMPILER_TYPE} == clang && ${COMPILER_VERSION} < 33) || ${COMPILER_TYPE} == gcc
+BUILD_DEPENDS+=	${LOCALBASE}/bin/clang33:${PORTSDIR}/lang/clang33
+CPP=	${LOCALBASE}/bin/clang-cpp33
+CC=	${LOCALBASE}/bin/clang33
+CXX=	${LOCALBASE}/bin/clang++33
+.endif
+.endif
+.endif
+
+.endif