1 #
   2 # Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
   3 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4 #
   5 # This code is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License version 2 only, as
   7 # published by the Free Software Foundation.
   8 #
   9 # This code is distributed in the hope that it will be useful, but WITHOUT
  10 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 # version 2 for more details (a copy is included in the LICENSE file that
  13 # accompanied this code).
  14 #
  15 # You should have received a copy of the GNU General Public License version
  16 # 2 along with this work; if not, write to the Free Software Foundation,
  17 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18 #
  19 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20 # or visit www.oracle.com if you need additional information or have any
  21 # questions.
  22 #  
  23 #
  24 
  25 #------------------------------------------------------------------------
  26 # CC, CXX & AS
  27 
  28 # If a SPEC is not set already, then use these defaults.
  29 ifeq ($(SPEC),)
  30   # When cross-compiling the ALT_COMPILER_PATH points
  31   # to the cross-compilation toolset
  32   ifdef CROSS_COMPILE_ARCH
  33     CXX = $(ALT_COMPILER_PATH)/g++
  34     CC  = $(ALT_COMPILER_PATH)/gcc
  35     HOSTCXX = g++
  36     HOSTCC  = gcc
  37     STRIP = $(ALT_COMPILER_PATH)/strip
  38   else
  39     ifeq ($(USE_CLANG), true)
  40       CXX = clang++
  41       CC  = clang
  42     else
  43       CXX = g++
  44       CC  = gcc
  45     endif
  46 
  47     HOSTCXX = $(CXX)
  48     HOSTCC  = $(CC)
  49     STRIP = strip
  50   endif
  51   AS  = $(CC) -c
  52 endif
  53 
  54 
  55 ifeq ($(USE_CLANG), true)
  56   CC_VER_MAJOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f1)
  57   CC_VER_MINOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f2)
  58 else
  59   # -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
  60   # prints the numbers (e.g. "2.95", "3.2.1")
  61   CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
  62   CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
  63 endif
  64 
  65 
  66 ifeq ($(USE_CLANG), true)
  67   # Clang has precompiled headers support by default, but the user can switch
  68   # it off by using 'USE_PRECOMPILED_HEADER=0'.
  69   ifdef LP64
  70     ifeq ($(USE_PRECOMPILED_HEADER),)
  71       USE_PRECOMPILED_HEADER=1
  72     endif
  73   else
  74     # We don't support precompiled headers on 32-bit builds because there some files are
  75     # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
  76     # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
  77     USE_PRECOMPILED_HEADER=0
  78   endif
  79 
  80   ifeq ($(USE_PRECOMPILED_HEADER),1)
  81 
  82     ifndef LP64
  83       $(error " Precompiled Headers only supported on 64-bit platforms!")
  84     endif
  85 
  86     PRECOMPILED_HEADER_DIR=.
  87     PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
  88     PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.pch
  89 
  90     PCH_FLAG = -include precompiled.hpp
  91     PCH_FLAG/DEFAULT = $(PCH_FLAG)
  92     PCH_FLAG/NO_PCH = -DNO_PCH
  93     PCH_FLAG/BY_FILE = $(PCH_FLAG/$@)$(PCH_FLAG/DEFAULT$(PCH_FLAG/$@))
  94 
  95     VM_PCH_FLAG/LIBJVM = $(PCH_FLAG/BY_FILE)
  96     VM_PCH_FLAG/AOUT =
  97     VM_PCH_FLAG = $(VM_PCH_FLAG/$(LINK_INTO))
  98 
  99     # We only use precompiled headers for the JVM build
 100     CFLAGS += $(VM_PCH_FLAG)
 101 
 102     # There are some files which don't like precompiled headers
 103     # The following files are build with 'OPT_CFLAGS/NOOPT' (-O0) in the opt build.
 104     # But Clang doesn't support a precompiled header which was compiled with -O3
 105     # to be used in a compilation unit which uses '-O0'. We could also prepare an
 106     # extra '-O0' PCH file for the opt build and use it here, but it's probably
 107     # not worth the effoert as long as only two files need this special handling.
 108     PCH_FLAG/loopTransform.o = $(PCH_FLAG/NO_PCH)
 109     PCH_FLAG/sharedRuntimeTrig.o = $(PCH_FLAG/NO_PCH)
 110     PCH_FLAG/sharedRuntimeTrans.o = $(PCH_FLAG/NO_PCH)
 111 
 112   endif
 113 else # ($(USE_CLANG), true)
 114   # check for precompiled headers support
 115   ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
 116     # Allow the user to turn off precompiled headers from the command line.
 117     ifneq ($(USE_PRECOMPILED_HEADER),0)
 118       PRECOMPILED_HEADER_DIR=.
 119       PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
 120       PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
 121     endif
 122   endif
 123 endif
 124 
 125 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
 126 ifeq ($(USE_PRECOMPILED_HEADER),0)
 127   CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
 128 endif
 129 
 130 
 131 #------------------------------------------------------------------------
 132 # Compiler flags
 133 
 134 # position-independent code
 135 PICFLAG = -fPIC
 136 
 137 VM_PICFLAG/LIBJVM = $(PICFLAG)
 138 VM_PICFLAG/AOUT   =
 139 VM_PICFLAG        = $(VM_PICFLAG/$(LINK_INTO))
 140 
 141 ifeq ($(JVM_VARIANT_ZERO), true)
 142 CFLAGS += $(LIBFFI_CFLAGS)
 143 endif
 144 ifeq ($(JVM_VARIANT_ZEROSHARK), true)
 145 CFLAGS += $(LIBFFI_CFLAGS)
 146 CFLAGS += $(LLVM_CFLAGS)
 147 endif
 148 CFLAGS += $(VM_PICFLAG)
 149 CFLAGS += -fno-rtti
 150 CFLAGS += -fno-exceptions
 151 CFLAGS += -D_REENTRANT
 152 ifeq ($(USE_CLANG),)
 153   CFLAGS += -fcheck-new
 154   # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
 155   # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
 156   ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
 157     CFLAGS += -fvisibility=hidden
 158   endif
 159 else
 160   CFLAGS += -fvisibility=hidden
 161 endif
 162 
 163 ifeq ($(USE_CLANG), true)
 164   # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm'
 165   # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment')
 166   ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0"
 167     STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16
 168   else
 169     STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm -stack-alignment=16
 170   endif
 171 endif
 172 
 173 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
 174 ARCHFLAG/i486    = -m32 -march=i586
 175 ARCHFLAG/amd64   = -m64 $(STACK_ALIGNMENT_OPT)
 176 ARCHFLAG/ia64    =
 177 ARCHFLAG/sparc   = -m32 -mcpu=v9
 178 ARCHFLAG/sparcv9 = -m64 -mcpu=v9
 179 ARCHFLAG/zero    = $(ZERO_ARCHFLAG)
 180 ARCHFLAG/ppc64   =  -m64
 181 
 182 CFLAGS     += $(ARCHFLAG)
 183 AOUT_FLAGS += $(ARCHFLAG)
 184 LFLAGS     += $(ARCHFLAG)
 185 ASFLAGS    += $(ARCHFLAG)
 186 
 187 # Use C++ Interpreter
 188 ifdef CC_INTERP
 189   CFLAGS += -DCC_INTERP
 190 endif
 191 
 192 # Keep temporary files (.ii, .s)
 193 ifdef NEED_ASM
 194   CFLAGS += -save-temps
 195 else
 196   CFLAGS += -pipe
 197 endif
 198 
 199 # Compiler warnings are treated as errors
 200 WARNINGS_ARE_ERRORS = -Werror
 201 
 202 ifeq ($(USE_CLANG), true)
 203   # However we need to clean the code up before we can unrestrictedly enable this option with Clang
 204   WARNINGS_ARE_ERRORS += -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses
 205   WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-constant-out-of-range-compare -Wno-tautological-compare
 206   WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess
 207   WARNINGS_ARE_ERRORS += -Wno-return-type -Wno-empty-body
 208 endif
 209 
 210 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value
 211 
 212 ifeq ($(USE_CLANG),)
 213   # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
 214   # conversions which might affect the values. Only enable it in earlier versions.
 215   ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
 216     WARNING_FLAGS += -Wconversion
 217   endif
 218 endif
 219 
 220 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
 221 # Special cases
 222 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 
 223 
 224 # The flags to use for an Optimized g++ build
 225 OPT_CFLAGS/SIZE=-Os
 226 OPT_CFLAGS/SPEED=-O3
 227 
 228 # Hotspot uses very unstrict aliasing turn this optimization off
 229 # This option is added to CFLAGS rather than OPT_CFLAGS
 230 # so that OPT_CFLAGS overrides get this option too.
 231 CFLAGS += -fno-strict-aliasing 
 232 
 233 OPT_CFLAGS_DEFAULT ?= SPEED
 234 
 235 ifdef OPT_CFLAGS
 236   ifneq ("$(origin OPT_CFLAGS)", "command line")
 237     $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
 238   endif
 239 endif
 240 
 241 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
 242 
 243 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp 
 244 # if we use expensive-optimizations
 245 ifeq ($(BUILDARCH), ia64)
 246 OPT_CFLAGS += -fno-expensive-optimizations
 247 endif
 248 
 249 OPT_CFLAGS/NOOPT=-O0
 250 
 251 # Work around some compiler bugs.
 252 ifeq ($(USE_CLANG), true)
 253   ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
 254     OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
 255   endif
 256 else
 257   # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
 258   ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
 259     OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
 260   endif
 261 endif
 262 
 263 # Flags for generating make dependency flags.
 264 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
 265 ifeq ($(USE_CLANG),)
 266   ifneq ("${CC_VER_MAJOR}", "2")
 267     DEPFLAGS += -fpch-deps
 268   endif
 269 endif
 270 
 271 #------------------------------------------------------------------------
 272 # Linker flags
 273 
 274 # statically link libstdc++.so, work with gcc but ignored by g++
 275 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
 276 
 277 ifeq ($(USE_CLANG),)
 278   # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
 279   ifneq ("${CC_VER_MAJOR}", "2")
 280     STATIC_LIBGCC += -static-libgcc
 281   endif
 282 
 283   ifeq ($(BUILDARCH), ia64)
 284     LFLAGS += -Wl,-relax
 285   endif
 286 endif
 287 
 288 # Enable linker optimization
 289 LFLAGS += -Xlinker -O1
 290 
 291 ifeq ($(USE_CLANG),)
 292   # If this is a --hash-style=gnu system, use --hash-style=both
 293   #   The gnu .hash section won't work on some Linux systems like SuSE 10.
 294   _HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
 295   ifneq ($(_HAS_HASH_STYLE_GNU),)
 296     LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
 297   endif
 298 else
 299   # Don't know how to find out the 'hash style' of a system as '-dumpspecs'
 300   # doesn't work for Clang. So for now we'll alwys use --hash-style=both
 301   LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
 302 endif
 303 
 304 LFLAGS += $(LDFLAGS_HASH_STYLE)
 305 
 306 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
 307 MAPFLAG = -Xlinker --version-script=FILENAME
 308 
 309 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
 310 SONAMEFLAG = -Xlinker -soname=SONAME
 311 
 312 # Build shared library
 313 SHARED_FLAG = -shared
 314 
 315 # Keep symbols even they are not used
 316 AOUT_FLAGS += -Xlinker -export-dynamic
 317 
 318 #------------------------------------------------------------------------
 319 # Debug flags
 320 
 321 ifeq ($(USE_CLANG), true)
 322   # Restrict the debug information created by Clang to avoid
 323   # too big object files and speed the build up a little bit
 324   # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
 325   CFLAGS += -flimit-debug-info
 326 endif
 327 
 328 # DEBUG_BINARIES uses full -g debug information for all configs
 329 ifeq ($(DEBUG_BINARIES), true)
 330   CFLAGS += -g
 331 else
 332   # Use the stabs format for debugging information (this is the default
 333   # on gcc-2.91). It's good enough, has all the information about line
 334   # numbers and local variables, and libjvm.so is only about 16M.
 335   # Change this back to "-g" if you want the most expressive format.
 336   # (warning: that could easily inflate libjvm.so to 150M!)
 337   # Note: The Itanium gcc compiler crashes when using -gstabs.
 338   DASH_G_FLAG/ia64  = -g
 339   DASH_G_FLAG/amd64 = -g
 340   DASH_G_FLAG/ppc64 = -g
 341 
 342   ifeq ($(USE_CLANG), true)
 343     # Clang doesn't understand -gstabs
 344     DASH_G_FLAG/$(BUILDARCH) ?= -g
 345   else
 346     DASH_G_FLAG/$(BUILDARCH) ?= -gstabs
 347   endif
 348 
 349   DEBUG_CFLAGS += $(DASH_G_FLAG/$(BUILDARCH))
 350 
 351   ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
 352     FASTDEBUG_CFLAGS += $(DASH_G_FLAG/$(BUILDARCH))
 353     OPT_CFLAGS += $(DASH_G_FLAG/$(BUILDARCH))
 354   endif
 355 endif
 356 
 357 # If we are building HEADLESS, pass on to VM
 358 # so it can set the java.awt.headless property
 359 ifdef HEADLESS
 360 CFLAGS += -DHEADLESS
 361 endif
 362 
 363 # We are building Embedded for a small device
 364 # favor code space over speed
 365 ifdef MINIMIZE_RAM_USAGE
 366 CFLAGS += -DMINIMIZE_RAM_USAGE
 367 endif
 368 
 369 # Stack walking in the JVM relies on frame pointer (%rbp) to walk thread stack.
 370 # Explicitly specify -fno-omit-frame-pointer because it is off by default
 371 # starting with gcc 4.6.
 372 ifndef USE_SUNCC
 373   CFLAGS += -fno-omit-frame-pointer
 374 endif
 375 
 376 -include $(HS_ALT_MAKE)/linux/makefiles/gcc.make