#
# Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
# Copyright (c) 2013 Red Hat, Inc.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 only, as
# published by the Free Software Foundation.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# version 2 for more details (a copy is included in the LICENSE file that
# accompanied this code).
#
# You should have received a copy of the GNU General Public License version
# 2 along with this work; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
# or visit www.oracle.com if you need additional information or have any
# questions.
#  
#

#------------------------------------------------------------------------
# CC, CXX & AS

# If a SPEC is not set already, then use these defaults.
ifeq ($(SPEC),)
  # When cross-compiling the ALT_COMPILER_PATH points
  # to the cross-compilation toolset
  ifdef CROSS_COMPILE_ARCH
    CXX ?= $(ALT_COMPILER_PATH)/g++
    CC  ?= $(ALT_COMPILER_PATH)/gcc
    HOSTCXX ?= g++
    HOSTCC ?= gcc
    STRIP ?= $(ALT_COMPILER_PATH)/strip
  else
    CXX ?= g++
    CC  ?= gcc
    HOSTCXX ?= $(CXX)
    HOSTCC  ?= $(CC)
    STRIP ?= strip
  endif
  AS  = $(CC) -c
endif

# -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
# prints the numbers (e.g. "2.95", "3.2.1")
CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)

# check for precompiled headers support
ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
# Allow the user to turn off precompiled headers from the command line.
ifneq ($(USE_PRECOMPILED_HEADER),0)
PRECOMPILED_HEADER_DIR=.
PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
endif
endif


#------------------------------------------------------------------------
# Compiler flags

# position-independent code
ifneq ($(filter parisc ppc ppc64 s390 s390x sparc sparc64 sparcv9,$(ZERO_LIBARCH)),)
PICFLAG = -fPIC
else
PICFLAG = -fpic
endif

VM_PICFLAG/LIBJVM = $(PICFLAG)
VM_PICFLAG/AOUT   =
VM_PICFLAG        = $(VM_PICFLAG/$(LINK_INTO))

ifeq ($(TYPE),ZERO)
CFLAGS += $(LIBFFI_CFLAGS)
endif
ifeq ($(TYPE),SHARK)
CFLAGS += $(LIBFFI_CFLAGS)
CFLAGS += $(LLVM_CFLAGS)
endif
CFLAGS += -std=gnu++98
CFLAGS += $(VM_PICFLAG)
CFLAGS += -fno-rtti
CFLAGS += -fno-exceptions
CFLAGS += -D_REENTRANT
CFLAGS += -fcheck-new
CFLAGS += -fstack-protector
# version 4 and above support fvisibility=hidden (matches jni_x86.h file)
# except 4.1.2 gives pointless warnings that can't be disabled (afaik)
ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
CFLAGS += -fvisibility=hidden
endif
# GCC 6 has more aggressive dead-store elimination which causes the VM to crash
# It also optimises away null pointer checks which are still needed.
# We turn both of these optimisations off.
ifneq "$(shell expr \( $(CC_VER_MAJOR) \>= 6 \))" "0"
CFLAGS += -fno-delete-null-pointer-checks -fno-lifetime-dse
endif

ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
ARCHFLAG/i486    = -m32 -march=i586
ARCHFLAG/amd64   = -m64
ARCHFLAG/aarch64 =
ARCHFLAG/ia64    =
ARCHFLAG/sparc   = -m32 -mcpu=v9
ARCHFLAG/sparcv9 = -m64 -mcpu=v9
ARCHFLAG/arm     =  -fsigned-char
ARCHFLAG/zero    = $(ZERO_ARCHFLAG)
ifndef E500V2
ARCHFLAG/ppc     =  -mcpu=powerpc
endif
ARCHFLAG/ppc64   =  -m64
# gcc bug http://gcc.gnu.org/PR63341 in ppc code generation requires -fno-tree-vectorize for now
# Fixed in GCC 5 and later
ifeq "$(shell expr \( $(CC_VER_MAJOR) \< 5 \) )" "1"
ARCHFLAG/ppc     += -fno-tree-vectorize
ARCHFLAG/ppc64   += -fno-tree-vectorize
ifeq ($(TYPE),ZERO)
  ifeq ($(ZERO_ARCHDEF),PPC)
    ARCHFLAG/zero += -fno-tree-vectorize
  endif
  ifeq ($(ZERO_ARCHDEF),PPC32)
    ARCHFLAG/zero += -fno-tree-vectorize
  endif
  ifeq ($(ZERO_ARCHDEF),PPC64)
    ARCHFLAG/zero += -fno-tree-vectorize
  endif
endif
endif

CFLAGS     += $(ARCHFLAG)
AOUT_FLAGS += $(ARCHFLAG)
LFLAGS     += $(ARCHFLAG)
ASFLAGS    += $(ARCHFLAG)

ifdef E500V2
CFLAGS += -DE500V2
endif

# Use C++ Interpreter
ifdef CC_INTERP
  CFLAGS += -DCC_INTERP
endif

# Build for embedded targets
ifdef JAVASE_EMBEDDED
  CFLAGS += -DJAVASE_EMBEDDED
endif

# Keep temporary files (.ii, .s)
ifdef NEED_ASM
  CFLAGS += -save-temps
else
  CFLAGS += -pipe
endif

# Compiler warnings are treated as errors
ifneq ($(COMPILER_WARNINGS_FATAL),false)
WARNINGS_ARE_ERRORS = -Werror
endif

# Except for a few acceptable ones
# Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
# conversions which might affect the values. To avoid that, we need to turn
# it off explicitly. 
ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
ACCEPTABLE_WARNINGS = -Wpointer-arith -Wsign-compare -Wreturn-type
else
ACCEPTABLE_WARNINGS = -Wpointer-arith -Wconversion -Wsign-compare -Wreturn-type
endif

CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(ACCEPTABLE_WARNINGS)
# Special cases
CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 

# The flags to use for an Optimized g++ build
OPT_CFLAGS += -O3

# Hotspot uses very unstrict aliasing turn this optimization off
OPT_CFLAGS += -fno-strict-aliasing

# The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp 
# if we use expensive-optimizations
ifeq ($(BUILDARCH), ia64)
OPT_CFLAGS += -fno-expensive-optimizations
endif

OPT_CFLAGS/NOOPT=-O0

# 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation. 
ifneq "$(shell expr \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) = 3 \) \))" "0"
OPT_CFLAGS/mulnode.o += -O0
endif

# 8041658. Problem in GCC 4.9.0 with virtualisation removing return statements.
ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 9), 1)
OPT_CFLAGS += -fno-devirtualize
endif

# Flags for generating make dependency flags.
ifneq ("${CC_VER_MAJOR}", "2")
DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
endif

# -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
ifeq ($(USE_PRECOMPILED_HEADER),0)
CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
endif

#------------------------------------------------------------------------
# Linker flags

# statically link libstdc++.so, work with gcc but ignored by g++
STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic

# statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
ifneq ("${CC_VER_MAJOR}", "2")
STATIC_LIBGCC += -static-libgcc
endif

ifeq ($(BUILDARCH), ia64)
LFLAGS += -Wl,-relax
endif

# Enable linker optimization
LFLAGS += -Xlinker -O1

# If this is a --hash-style=gnu system, use --hash-style=both
#   The gnu .hash section won't work on some Linux systems like SuSE 10.
_HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
ifneq ($(_HAS_HASH_STYLE_GNU),)
  LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
endif
LFLAGS += $(LDFLAGS_HASH_STYLE)

# Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
MAPFLAG = -Xlinker --version-script=FILENAME

# Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
SONAMEFLAG = -Xlinker -soname=SONAME

# Build shared library
SHARED_FLAG = -shared

# Keep symbols even they are not used
AOUT_FLAGS += -Xlinker -export-dynamic

#------------------------------------------------------------------------
# Debug flags

# DEBUG_BINARIES uses full -g debug information for all configs
ifeq ($(DEBUG_BINARIES), true)
  CFLAGS += -g
else
  # Use the stabs format for debugging information (this is the default
  # on gcc-2.91). It's good enough, has all the information about line
  # numbers and local variables, and libjvm_g.so is only about 16M.
  # Change this back to "-g" if you want the most expressive format.
  # (warning: that could easily inflate libjvm_g.so to 150M!)
  # Note: The Itanium gcc compiler crashes when using -gstabs.
  DEBUG_CFLAGS/ia64  = -g
  DEBUG_CFLAGS/amd64 = -g
  DEBUG_CFLAGS/aarch64 = -g
  DEBUG_CFLAGS/arm   = -g
  DEBUG_CFLAGS/ppc   = -g
  DEBUG_CFLAGS/ppc64 = -g
  DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
  ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
    DEBUG_CFLAGS += -gstabs
  endif
  
  ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
    FASTDEBUG_CFLAGS/ia64  = -g
    FASTDEBUG_CFLAGS/amd64 = -g
    FASTDEBUG_CFLAGS/aarch64 = -g
    FASTDEBUG_CFLAGS/arm   = -g
    FASTDEBUG_CFLAGS/ppc   = -g
    FASTDEBUG_CFLAGS/ppc64 = -g
    FASTDEBUG_CFLAGS/zero  = -g
    FASTDEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
    ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
      FASTDEBUG_CFLAGS += -gstabs
    endif
  
    OPT_CFLAGS/ia64  = -g
    OPT_CFLAGS/amd64 = -g
    OPT_CFLAGS/aarch64 = -g
    OPT_CFLAGS/arm   = -g
    OPT_CFLAGS/ppc   = -g
    OPT_CFLAGS/ppc64 = -g
    OPT_CFLAGS/zero  = -g
    OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
    ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
      OPT_CFLAGS += -gstabs
    endif
  endif
endif

# If we are building HEADLESS, pass on to VM
# so it can set the java.awt.headless property
ifdef HEADLESS
CFLAGS += -DHEADLESS
endif

# We are building Embedded for a small device
# favor code space over speed
ifdef MINIMIZE_RAM_USAGE
CFLAGS += -DMINIMIZE_RAM_USAGE
endif
