add clang build support.

git-svn-id: http://root.cern.ch/svn/root/trunk@32568 27541ba8-7e3a-0410-8455-c3a389f83636

Makefile

@@ -373,8 +373,12 @@ endif
 
 CXXOUT ?= -o # keep whitespace after "-o"
 
-##### gcc version #####
+##### clang or gcc version #####
 
+ifneq ($(findstring clang,$(CXX)),)
+CLANG_MAJOR  := $(shell $(CXX) -v 2>&1 | awk '{if (NR==1) print $$3}' | cut -d'.' -f1)
+CLANG_MINOR  := $(shell $(CXX) -v 2>&1 | awk '{if (NR==1) print $$3}' | cut -d'.' -f2)
+else
 ifneq ($(findstring gnu,$(COMPILER)),)
 GCC_MAJOR     := $(shell $(CXX) -dumpversion 2>&1 | cut -d'.' -f1)
 GCC_MINOR     := $(shell $(CXX) -dumpversion 2>&1 | cut -d'.' -f2)
@@ -382,6 +386,7 @@ GCC_PATCH     := $(shell $(CXX) -dumpversion 2>&1 | cut -d'.' -f3)
 GCC_VERS      := gcc-$(GCC_MAJOR).$(GCC_MINOR)
 GCC_VERS_FULL := gcc-$(GCC_MAJOR).$(GCC_MINOR).$(GCC_PATCH)
 endif
+endif
 
 ##### f77 options #####
 

cint/cint/Module.mk

@@ -164,6 +164,12 @@ CINTS2       := $(filter-out $(MODDIRSD)/longif.%,$(CINTS2))
 CINTS2       += $(MODDIRSD)/gcc4strm.cxx
 CINTS2       += $(MODDIRSD)/longif3.cxx
 endif
+ifeq ($(CLANG_MAJOR),1)
+CINTS2       := $(filter-out $(MODDIRSD)/libstrm.%,$(CINTS2))
+CINTS2       := $(filter-out $(MODDIRSD)/longif.%,$(CINTS2))
+CINTS2       += $(MODDIRSD)/gcc4strm.cxx
+CINTS2       += $(MODDIRSD)/longif3.cxx
+endif
 ifeq ($(CXXCMD),xlC)
 ifeq ($(PLATFORM),macosx)
 CINTS2       := $(filter-out $(MODDIRSD)/libstrm.%,$(CINTS2))
@@ -198,6 +204,9 @@ MAKECINT     := bin/makecint$(EXEEXT)
 ##### iosenum.h #####
 IOSENUM      := $(MODDIR)/include/iosenum.h
 IOSENUMC     := $(CINTDIRIOSEN)/iosenum.cxx
+ifeq ($(CLANG_MAJOR),1)
+IOSENUMA     := $(CINTDIRIOSEN)/iosenum.$(ARCH)3
+else
 ifeq ($(GCC_MAJOR),4)
 IOSENUMA     := $(CINTDIRIOSEN)/iosenum.$(ARCH)3
 else
@@ -207,6 +216,7 @@ else
 IOSENUMA     := $(CINTDIRIOSEN)/iosenum.$(ARCH)
 endif
 endif
+endif
 
 # used in the main Makefile
 ALLHDRS     += $(CINTHT)