#
# ------ GNU/LINUX ------ gcc 3.2 and higher
#
ifeq ($(G4SYSTEM),Linux-g++)
  CXX       := g++
  CXXFLAGS  := -W -Wall -ansi -pedantic -Wno-non-virtual-dtor -Wno-long-long
  CXXFLAGS  += -Wwrite-strings -Wpointer-arith -Woverloaded-virtual -pipe
#
# Uncomment the following options to activate Pentium4 chip specific
# floating-point operations on the SSE unit. It will allow for more stable
# results (no output differences between debug/optimised runs) and little
# performance improvement (in the order of 2%).
# NOTE: binaries built using these options will NOT be portable cross
#       platforms. Will only run on Pentium4-based architectures !
#
# CXXFLAGS  += -march=pentium4 -mfpmath=sse
  ifdef G4OPTIMISE
    CXXFLAGS  += -O2
    FCFLAGS   := -O2
    CCFLAGS   := -O2
  else
    ifdef G4DEBUG
      CXXFLAGS  += -g
      FCFLAGS   := -g
      CCFLAGS   := -g
    endif
  endif
  ifdef G4PROFILE
    CXXFLAGS  += -pg
    FCFLAGS   += -pg
    CCFLAGS   += -pg
  endif
  ifdef G4OPTDEBUG
    CXXFLAGS  += -O2 -g
    FCFLAGS   += -O2 -g
    CCFLAGS   += -O2 -g
  endif
  ifdef G4LIB_BUILD_SHARED
    CXXFLAGS  += -fPIC
    FCFLAGS   += -fPIC
    CCFLAGS   += -fPIC
  endif
  G4RUNPATHOPTION := -Wl,-rpath 
  CC := gcc
  FC := gfortran
  FCFLAGS += -fno-automatic -fno-backslash -fno-second-underscore
  FCLIBS := -lg2c -lnsl
  ECHO   := /bin/echo -e
  SHEXT  := so
  ARCH   := $(shell uname -m | cut -s -d "_" -f 2)

  ifndef X11FLAGS
    X11FLAGS  := -I/usr/include/X11/extensions -I/usr/include/X11
  endif
  ifndef X11LIBS
    X11LIBS   := -L/usr/X11R6/lib$(ARCH)  -lXmu -lXt -lXext -lX11 -lSM -lICE
  endif
  ifndef XMFLAGS
    XMFLAGS   := -I/usr/X11R6/include
  endif
  ifndef XMLIBS
    XMLIBS    := -lXm -lXpm
  endif
  ifndef XAWFLAGS
    XAWFLAGS   := -I/usr/X11R6/include
  endif
  ifndef XAWLIBS
    XAWLIBS    := -lXaw
  endif
  DLDLIBS   := -ldl
  ifndef OGLFLAGS
    OGLFLAGS  := -I$(OGLHOME)/include 
  endif
  ifndef OGLLIBS
    OGLLIBS   := -L$(OGLHOME)/lib$(ARCH) -lGLU -lGL
  endif

# ---- QT Setup block -------------------------------------------------------
  ifndef QTHOME
    QTHOME     := /usr
  endif
  ifndef QTMOC
    QTMOC      := $(QTHOME)/bin/moc
  endif

  QT_VERSION := $(shell $(QTMOC) 2>&1 -v | sed 's/.* .Qt \([0-9]\)\..*/\1/' )

  ifndef QTFLAGS
    ifeq ($(QT_VERSION),4)
      QTFLAGS   += -I$(QTHOME)/include/qt$(QT_VERSION)
      QTFLAGS   += -I $(QTHOME)/include/qt$(QT_VERSION)/QtCore 
      QTFLAGS   += -I $(QTHOME)/include/qt$(QT_VERSION)/QtGui 
      QTFLAGS   += -I $(QTHOME)/include/qt$(QT_VERSION)/QtOpenGL 
    else
      QTFLAGS    := -I$(QTHOME)/include/qt$(QT_VERSION)/Qt
      QTFLAGS    += -I$(QTHOME)/include/qt$(QT_VERSION)
    endif
  endif
  ifndef QTLIBPATH
    QT_SEARCH_LIB1 := $(shell ls  $(QTHOME)/lib/qt$(QT_VERSION)/libq* 2>/dev/null | wc -l )
    QT_SEARCH_LIB2 := $(shell ls  $(QTHOME)/lib/libq*  2>/dev/null | wc -l )
    ifneq ($(QT_SEARCH_LIB1),0)
      QTLIBPATH   := /lib/qt$(QT_VERSION)
    endif
    ifneq ($(QT_SEARCH_LIB2),0)
      QTLIBPATH   := /lib
    endif
  endif
  ifndef QTLIBS
    QTLIBS   := -L$(QTHOME)$(QTLIBPATH)
    ifeq ($(QT_VERSION),3)
      QT3_MT  := $(shell ls  $(QTHOME)$(QTLIBPATH)/libqt-mt.* 2>/dev/null | wc -l )
      ifneq ($(QT3_MT),0)
        QTLIBS  += -lqt-mt
      else
        QTLIBS  += -lqt
      endif
      QTLIBS   += -lqui
    else
      QTLIBS    += -lQtCore -lQtGui
    endif
  endif
  ifndef GLQTLIBS
    ifeq ($(QT_VERSION),3)
        # already done in QTLIBS
        #      GLQTLIBS    := $(QTLIBS)
    else
      GLQTLIBS    := -L$(QTHOME)$(QTLIBPATH) -lQtCore -lQtGui -lQtOpenGL
    endif
  endif
#----------------------------------------------------------------------------

  define build-granular-shared-lib
    @libdir=`(cd $(@D);/bin/pwd)`; \
     cd $(G4TMPDIR); \
     $(CXX) -Wl,-soname,$(@F) -shared -o $$libdir/$(@F) $(INTYLIBS) *.o
  endef
  define build-global-shared-lib
    @libdir=`(cd $(@D);/bin/pwd)`; \
     cd $(G4TMP)/$(G4SYSTEM); \
     $(CXX) -Wl,-soname,$(@F) -shared -o $$libdir/$(@F) $(INTYLIBS) \
                    $(foreach dir,$(SUBLIBS),$(dir)/*.o);
  endef

endif