#
# ------ GNU/LINUX ------
#
ifeq ($(G4SYSTEM),Linux-g++)
  CXX       := g++
  GNU_GCC = 1
#  CXXFLAGS  := -Wall -ansi -pedantic -pipe -fno-for-scope -DGNU_GCC
  CXXFLAGS  := -pipe -fno-for-scope -DGNU_GCC
  ifdef G4OPTIMISE
    CXXFLAGS  += -O
    FCFLAGS   := -O
    CCFLAGS   := -O
  else
    ifdef G4DEBUG
      CXXFLAGS  += -g
      FCFLAGS   := -g
      CCFLAGS   := -g
    endif
  endif
  ifdef G4LIB_BUILD_SHARED
    CXXFLAGS  += -fPIC
    FCFLAGS   += -fPIC
    CCFLAGS   += -fPIC
  endif
  G4RUNPATHOPTION := -Wl,-rpath 
  FC := g77
  FCFLAGS += -fno-automatic -fno-backslash -fno-second-underscore
  FCLIBS := -lg2c -lnsl
  ECHO    := /bin/echo -e
  SHEXT   := so
  X11FLAGS  := -I/usr/include/X11/extensions -I/usr/include/X11
  X11LIBS   := -L/usr/X11R6/lib  -lXmu -lXt -lXext -lX11 -lSM -lICE
  XMFLAGS   := -I/usr/X11R6/include
  XMLIBS    := -lXm -lXpm
  DLDLIBS   := -ldl
  ifndef OGLFLAGS
    OGLFLAGS  := -I$(OGLHOME)/include 
  endif
  ifndef OGLLIBS
    OGLLIBS   := -L$(OGLHOME)/lib -lGLU -lGL
  endif
  OIVFLAGS  += -I$(OIHOME)/include 
  ifdef G4USE_OSPACE
    CPPFLAGS += -DOS_LINUX_2 -DOS_NEW_CHECK -DOS_STL_ASSERT
    CPPFLAGS += -DOS_NO_WSTRING -DOS_NO_ALLOCATORS
    CPPFLAGS += -I$(OSPACE_BASE_DIR)/ospace/std -I$(OSPACE_BASE_DIR)
#  else
#    G4USE_STD_NAMESPACE := yes
#    CPPFLAGS += -DG4USE_STD_NAMESPACE
  endif
  ifdef G4ODBMS
    GCCVERSION := $(shell g++ -v 2>&1 | grep version | grep egcs)
    ifeq ($(findstring 1.1,$(GCCVERSION)),1.1)
      G4DDLX_FLAGS += -D__STL_CLASS_PARTIAL_SPECIALIZATION -Dstd=""
    endif
  endif
  define build-granular-shared-lib
    @libdir=`(cd $(@D);/bin/pwd)`; \
     cd $(G4TMPDIR); \
     $(CXX) -Wl,-soname,$(@F) -shared -o $$libdir/$(@F) *.o
  endef
  define build-global-shared-lib
    @libdir=`(cd $(@D);/bin/pwd)`; \
     cd $(G4TMP)/$(G4SYSTEM); \
     $(CXX) -Wl,-soname,$(@F) -shared -o $$libdir/$(@F) \
                    $(foreach dir,$(SUBLIBS),$(dir)/*.o);
  endef

endif