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annotate make/linux/makefiles/gcc.make @ 9060:cc32ccaaf47f

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8003310: Enable -Wunused-function when compiling with gcc Summary: Add the -Wunused-function flag and remove a number of unused functions. Reviewed-by: dholmes, coleenp, kvn
author mikael
date Thu, 04 Apr 2013 10:01:26 -0700
parents 67342b960b47
children 2cb5d5f6d5e5
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1 #
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2 # Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
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3 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 #
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5 # This code is free software; you can redistribute it and/or modify it
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6 # under the terms of the GNU General Public License version 2 only, as
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7 # published by the Free Software Foundation.
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8 #
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9 # This code is distributed in the hope that it will be useful, but WITHOUT
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10 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 # version 2 for more details (a copy is included in the LICENSE file that
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13 # accompanied this code).
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14 #
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15 # You should have received a copy of the GNU General Public License version
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16 # 2 along with this work; if not, write to the Free Software Foundation,
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17 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 #
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19 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 # or visit www.oracle.com if you need additional information or have any
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21 # questions.
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22 #
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23 #
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24
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25 #------------------------------------------------------------------------
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26 # CC, CXX & AS
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27
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28 # If a SPEC is not set already, then use these defaults.
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29 ifeq ($(SPEC),)
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30 # When cross-compiling the ALT_COMPILER_PATH points
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31 # to the cross-compilation toolset
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32 ifdef CROSS_COMPILE_ARCH
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33 CXX = $(ALT_COMPILER_PATH)/g++
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34 CC = $(ALT_COMPILER_PATH)/gcc
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35 HOSTCXX = g++
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36 HOSTCC = gcc
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37 STRIP = $(ALT_COMPILER_PATH)/strip
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38 else
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39 CXX = g++
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40 CC = gcc
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41 HOSTCXX = $(CXX)
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42 HOSTCC = $(CC)
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43 STRIP = strip
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44 endif
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45 AS = $(CC) -c
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46 endif
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47
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48
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49 # -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
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50 # prints the numbers (e.g. "2.95", "3.2.1")
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51 CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
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52 CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
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53
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54 # check for precompiled headers support
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55 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
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56 # Allow the user to turn off precompiled headers from the command line.
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57 ifneq ($(USE_PRECOMPILED_HEADER),0)
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58 PRECOMPILED_HEADER_DIR=.
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59 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
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60 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
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61 endif
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62 endif
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64
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65 #------------------------------------------------------------------------
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66 # Compiler flags
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67
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68 # position-independent code
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69 PICFLAG = -fPIC
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70
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71 VM_PICFLAG/LIBJVM = $(PICFLAG)
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72 VM_PICFLAG/AOUT =
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73 VM_PICFLAG = $(VM_PICFLAG/$(LINK_INTO))
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74
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75 ifeq ($(JVM_VARIANT_ZERO), true)
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76 CFLAGS += $(LIBFFI_CFLAGS)
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77 endif
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78 ifeq ($(JVM_VARIANT_ZEROSHARK), true)
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79 CFLAGS += $(LIBFFI_CFLAGS)
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80 CFLAGS += $(LLVM_CFLAGS)
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81 endif
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82 CFLAGS += $(VM_PICFLAG)
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83 CFLAGS += -fno-rtti
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84 CFLAGS += -fno-exceptions
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85 CFLAGS += -D_REENTRANT
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86 CFLAGS += -fcheck-new
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87 # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
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88 # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
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89 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
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90 CFLAGS += -fvisibility=hidden
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91 endif
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92
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93 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
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94 ARCHFLAG/i486 = -m32 -march=i586
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95 ARCHFLAG/amd64 = -m64
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96 ARCHFLAG/ia64 =
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97 ARCHFLAG/sparc = -m32 -mcpu=v9
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98 ARCHFLAG/sparcv9 = -m64 -mcpu=v9
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99 ARCHFLAG/arm = -fsigned-char
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100 ARCHFLAG/zero = $(ZERO_ARCHFLAG)
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101 ifndef E500V2
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102 ARCHFLAG/ppc = -mcpu=powerpc
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103 endif
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104
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105 CFLAGS += $(ARCHFLAG)
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106 AOUT_FLAGS += $(ARCHFLAG)
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107 LFLAGS += $(ARCHFLAG)
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108 ASFLAGS += $(ARCHFLAG)
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109
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110 ifdef E500V2
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111 CFLAGS += -DE500V2
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112 endif
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113
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114 # Use C++ Interpreter
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115 ifdef CC_INTERP
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116 CFLAGS += -DCC_INTERP
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117 endif
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118
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119 # Keep temporary files (.ii, .s)
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120 ifdef NEED_ASM
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121 CFLAGS += -save-temps
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122 else
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123 CFLAGS += -pipe
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124 endif
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125
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126 # Compiler warnings are treated as errors
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127 WARNINGS_ARE_ERRORS = -Werror
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128
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129 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function
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130
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131 # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
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132 # conversions which might affect the values. Only enable it in earlier versions.
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133 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
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134 WARNING_FLAGS += -Wconversion
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135 endif
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136
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137 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
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138 # Special cases
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139 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@))
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140
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141 # The flags to use for an Optimized g++ build
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142 OPT_CFLAGS/SIZE=-Os
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143 OPT_CFLAGS/SPEED=-O3
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144
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145 # Hotspot uses very unstrict aliasing turn this optimization off
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146 # This option is added to CFLAGS rather than OPT_CFLAGS
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147 # so that OPT_CFLAGS overrides get this option too.
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148 CFLAGS += -fno-strict-aliasing
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149
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150 OPT_CFLAGS_DEFAULT ?= SPEED
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151
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152 ifdef OPT_CFLAGS
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153 ifneq ("$(origin OPT_CFLAGS)", "command line")
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154 $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
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155 endif
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156 endif
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157
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158 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
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159
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160 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp
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161 # if we use expensive-optimizations
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162 ifeq ($(BUILDARCH), ia64)
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163 OPT_CFLAGS += -fno-expensive-optimizations
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164 endif
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165
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166 OPT_CFLAGS/NOOPT=-O0
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167
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168 # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
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169 ifneq "$(shell expr \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) = 3 \) \))" "0"
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170 OPT_CFLAGS/mulnode.o += -O0
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171 endif
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172
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173 # Flags for generating make dependency flags.
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174 ifneq ("${CC_VER_MAJOR}", "2")
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175 DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
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176 endif
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177
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178 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
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179 ifeq ($(USE_PRECOMPILED_HEADER),0)
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180 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
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181 endif
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182
0
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183 #------------------------------------------------------------------------
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184 # Linker flags
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185
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186 # statically link libstdc++.so, work with gcc but ignored by g++
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187 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
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188
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189 # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
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190 ifneq ("${CC_VER_MAJOR}", "2")
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191 STATIC_LIBGCC += -static-libgcc
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192 endif
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193
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194 ifeq ($(BUILDARCH), ia64)
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195 LFLAGS += -Wl,-relax
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196 endif
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197
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198 # Enable linker optimization
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199 LFLAGS += -Xlinker -O1
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200
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201 # If this is a --hash-style=gnu system, use --hash-style=both
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202 # The gnu .hash section won't work on some Linux systems like SuSE 10.
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203 _HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
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204 ifneq ($(_HAS_HASH_STYLE_GNU),)
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205 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
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206 endif
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207 LFLAGS += $(LDFLAGS_HASH_STYLE)
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208
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209 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
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210 MAPFLAG = -Xlinker --version-script=FILENAME
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211
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212 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
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213 SONAMEFLAG = -Xlinker -soname=SONAME
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214
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215 # Build shared library
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216 SHARED_FLAG = -shared
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217
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218 # Keep symbols even they are not used
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219 AOUT_FLAGS += -Xlinker -export-dynamic
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220
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221 #------------------------------------------------------------------------
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222 # Debug flags
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223
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224 # DEBUG_BINARIES uses full -g debug information for all configs
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225 ifeq ($(DEBUG_BINARIES), true)
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226 CFLAGS += -g
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227 else
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228 # Use the stabs format for debugging information (this is the default
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229 # on gcc-2.91). It's good enough, has all the information about line
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230 # numbers and local variables, and libjvm.so is only about 16M.
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231 # Change this back to "-g" if you want the most expressive format.
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232 # (warning: that could easily inflate libjvm.so to 150M!)
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233 # Note: The Itanium gcc compiler crashes when using -gstabs.
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234 DEBUG_CFLAGS/ia64 = -g
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235 DEBUG_CFLAGS/amd64 = -g
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236 DEBUG_CFLAGS/arm = -g
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237 DEBUG_CFLAGS/ppc = -g
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238 DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
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239 ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
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240 DEBUG_CFLAGS += -gstabs
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241 endif
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242
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243 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
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244 FASTDEBUG_CFLAGS/ia64 = -g
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245 FASTDEBUG_CFLAGS/amd64 = -g
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246 FASTDEBUG_CFLAGS/arm = -g
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247 FASTDEBUG_CFLAGS/ppc = -g
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248 FASTDEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
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249 ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
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250 FASTDEBUG_CFLAGS += -gstabs
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251 endif
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252
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253 OPT_CFLAGS/ia64 = -g
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254 OPT_CFLAGS/amd64 = -g
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255 OPT_CFLAGS/arm = -g
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256 OPT_CFLAGS/ppc = -g
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257 OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
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258 ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
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259 OPT_CFLAGS += -gstabs
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260 endif
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261 endif
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262 endif
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263
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264 # If we are building HEADLESS, pass on to VM
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265 # so it can set the java.awt.headless property
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266 ifdef HEADLESS
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267 CFLAGS += -DHEADLESS
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268 endif
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269
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270 # We are building Embedded for a small device
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271 # favor code space over speed
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272 ifdef MINIMIZE_RAM_USAGE
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273 CFLAGS += -DMINIMIZE_RAM_USAGE
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274 endif