hotspot/make/bsd/makefiles/gcc.make

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rev 5915 : 8032045: Enable compiler and linker safety switches for debug builds
Reviewed-by: duke


  83   AS   = $(CC) -c 
  84 endif
  85 
  86 ifeq ($(OS_VENDOR), Darwin)
  87   ifeq ($(DSYMUTIL),)
  88     DSYMUTIL=dsymutil
  89   endif
  90 endif
  91 
  92 ifeq ($(USE_CLANG), true)
  93   CC_VER_MAJOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f1)
  94   CC_VER_MINOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f2)
  95 else
  96   # -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
  97   # prints the numbers (e.g. "2.95", "3.2.1")
  98   CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
  99   CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
 100 endif
 101 
 102 ifeq ($(USE_CLANG), true)
 103   # clang has precompiled headers support by default, but the user can switch
 104   # it off by using 'USE_PRECOMPILED_HEADER=0'.
 105   ifdef LP64
 106     ifeq ($(USE_PRECOMPILED_HEADER),)
 107       USE_PRECOMPILED_HEADER=1
 108     endif
 109   else
 110     # We don't support precompiled headers on 32-bit builds because there some files are
 111     # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
 112     # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
 113     USE_PRECOMPILED_HEADER=0
 114   endif
 115   
 116   ifeq ($(USE_PRECOMPILED_HEADER),1)
 117   
 118     ifndef LP64
 119       $(error " Precompiled Headers only supported on 64-bit platforms!")
 120     endif
 121   
 122     PRECOMPILED_HEADER_DIR=.
 123     PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp


 249 ifneq ($(COMPILER_WARNINGS_FATAL),false)
 250   WARNINGS_ARE_ERRORS = -Werror
 251 endif
 252 
 253 ifeq ($(USE_CLANG), true)
 254   # However we need to clean the code up before we can unrestrictedly enable this option with Clang
 255   WARNINGS_ARE_ERRORS += -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses
 256   WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-compare
 257 # Not yet supported by clang in Xcode 4.6.2
 258 #  WARNINGS_ARE_ERRORS += -Wno-tautological-constant-out-of-range-compare
 259   WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess
 260   WARNINGS_ARE_ERRORS += -Wno-empty-body
 261 endif
 262 
 263 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value
 264 
 265 ifeq ($(USE_CLANG),)
 266   # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
 267   # conversions which might affect the values. Only enable it in earlier versions.
 268   ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
 269     WARNINGS_FLAGS += -Wconversion
 270   endif
 271 endif
 272 
 273 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
 274 # Special cases
 275 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 
 276 # XXXDARWIN: for _dyld_bind_fully_image_containing_address
 277 ifeq ($(OS_VENDOR), Darwin)
 278   CFLAGS_WARN/os_bsd.o = $(CFLAGS_WARN/DEFAULT) -Wno-deprecated-declarations
 279 endif
 280 









 281 OPT_CFLAGS/SIZE=-Os
 282 OPT_CFLAGS/SPEED=-O3
 283 
 284 # Hotspot uses very unstrict aliasing turn this optimization off
 285 # This option is added to CFLAGS rather than OPT_CFLAGS
 286 # so that OPT_CFLAGS overrides get this option too.
 287 CFLAGS += -fno-strict-aliasing
 288 
 289 # The flags to use for an Optimized g++ build
 290 ifeq ($(OS_VENDOR), Darwin)
 291   # use -Os by default, unless -O3 can be proved to be worth the cost, as per policy
 292   # <http://wikis.sun.com/display/OpenJDK/Mac+OS+X+Port+Compilers>
 293   OPT_CFLAGS_DEFAULT ?= SIZE
 294 else
 295   OPT_CFLAGS_DEFAULT ?= SPEED
 296 endif
 297 





 298 ifdef OPT_CFLAGS
 299   ifneq ("$(origin OPT_CFLAGS)", "command line")
 300     $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
 301   endif
 302 endif
 303 
 304 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
 305 
 306 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp
 307 # if we use expensive-optimizations
 308 ifeq ($(BUILDARCH), ia64)
 309 OPT_CFLAGS += -fno-expensive-optimizations
 310 endif
 311 
 312 OPT_CFLAGS/NOOPT=-O0
 313 
 314 # Work around some compiler bugs.
 315 ifeq ($(USE_CLANG), true)
 316   ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
 317     OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
 318     OPT_CFLAGS/unsafe.o += -O1
 319   endif
 320 else
 321   # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
 322   ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
 323     OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
 324   endif
 325 endif
 326 
 327 # Flags for generating make dependency flags.
 328 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
 329 ifeq ($(USE_CLANG),)
 330   ifneq ($(CC_VER_MAJOR), 2)
 331     DEPFLAGS += -fpch-deps
 332   endif
 333 endif


 349   CFLAGS += -DMAC_OS_X_VERSION_MAX_ALLOWED=$(subst .,,$(MACOSX_VERSION_MIN)) \
 350             -mmacosx-version-min=$(MACOSX_VERSION_MIN)
 351   LDFLAGS += -mmacosx-version-min=$(MACOSX_VERSION_MIN)
 352 endif
 353 
 354 
 355 #------------------------------------------------------------------------
 356 # Assembler flags
 357 
 358 # Enforce prerpocessing of .s files
 359 ASFLAGS += -x assembler-with-cpp
 360 
 361 #------------------------------------------------------------------------
 362 # Linker flags
 363 
 364 # statically link libstdc++.so, work with gcc but ignored by g++
 365 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
 366 
 367 ifeq ($(USE_CLANG),)
 368   # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
 369   ifneq ("${CC_VER_MAJOR}", "2")
 370     STATIC_LIBGCC += -static-libgcc
 371   endif
 372 













 373   ifeq ($(BUILDARCH), ia64)
 374     LFLAGS += -Wl,-relax
 375   endif
 376 endif
 377 
 378 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
 379 MAPFLAG = -Xlinker --version-script=FILENAME
 380 
 381 #
 382 # Shared Library
 383 #
 384 ifeq ($(OS_VENDOR), Darwin)
 385   # Standard linker flags
 386   LFLAGS +=
 387 
 388   # The apple linker has its own variant of mapfiles/version-scripts
 389   MAPFLAG = -Xlinker -exported_symbols_list -Xlinker FILENAME
 390 
 391   # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
 392   SONAMEFLAG =


 403   # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
 404   SONAMEFLAG = -Xlinker -soname=SONAME
 405 
 406   # Build shared library
 407   SHARED_FLAG = -shared $(VM_PICFLAG)
 408 
 409   # Keep symbols even they are not used
 410   AOUT_FLAGS += -Xlinker -export-dynamic
 411 endif
 412 
 413 #------------------------------------------------------------------------
 414 # Debug flags
 415 
 416 ifeq ($(USE_CLANG), true)
 417   # Restrict the debug information created by Clang to avoid
 418   # too big object files and speed the build up a little bit
 419   # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
 420   CFLAGS += -flimit-debug-info
 421 endif
 422 








 423 # DEBUG_BINARIES uses full -g debug information for all configs
 424 ifeq ($(DEBUG_BINARIES), true)
 425   CFLAGS += -g
 426 else
 427   # Use the stabs format for debugging information (this is the default
 428   # on gcc-2.91). It's good enough, has all the information about line
 429   # numbers and local variables, and libjvm.so is only about 16M.
 430   # Change this back to "-g" if you want the most expressive format.
 431   # (warning: that could easily inflate libjvm.so to 150M!)
 432   # Note: The Itanium gcc compiler crashes when using -gstabs.
 433   DEBUG_CFLAGS/ia64  = -g
 434   DEBUG_CFLAGS/amd64 = -g
 435   DEBUG_CFLAGS/arm   = -g
 436   DEBUG_CFLAGS/ppc   = -g
 437   DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
 438   ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)




 439   DEBUG_CFLAGS += -gstabs
 440   endif

 441   
 442   ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
 443     FASTDEBUG_CFLAGS/ia64  = -g
 444     FASTDEBUG_CFLAGS/amd64 = -g
 445     FASTDEBUG_CFLAGS/arm   = -g
 446     FASTDEBUG_CFLAGS/ppc   = -g
 447     FASTDEBUG_CFLAGS += $(FASTDEBUG_CFLAGS/$(BUILDARCH))
 448     ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
 449       ifeq ($(USE_CLANG), true)
 450         # Clang doesn't understand -gstabs
 451         FASTDEBUG_CFLAGS += -g
 452       else
 453         FASTDEBUG_CFLAGS += -gstabs
 454       endif
 455     endif
 456   
 457     OPT_CFLAGS/ia64  = -g
 458     OPT_CFLAGS/amd64 = -g
 459     OPT_CFLAGS/arm   = -g
 460     OPT_CFLAGS/ppc   = -g
 461     OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
 462     ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
 463       ifeq ($(USE_CLANG), true)
 464         # Clang doesn't understand -gstabs
 465         OPT_CFLAGS += -g
 466       else
 467         OPT_CFLAGS += -gstabs
 468       endif














 469     endif
 470   endif
 471 endif
 472 
 473 # If we are building HEADLESS, pass on to VM
 474 # so it can set the java.awt.headless property
 475 ifdef HEADLESS
 476 CFLAGS += -DHEADLESS
 477 endif
 478 
 479 # We are building Embedded for a small device
 480 # favor code space over speed
 481 ifdef MINIMIZE_RAM_USAGE
 482 CFLAGS += -DMINIMIZE_RAM_USAGE
 483 endif


  83   AS  = $(CC) -c
  84 endif
  85 
  86 ifeq ($(OS_VENDOR), Darwin)
  87   ifeq ($(DSYMUTIL),)
  88     DSYMUTIL=dsymutil
  89   endif
  90 endif
  91 
  92 ifeq ($(USE_CLANG), true)
  93   CC_VER_MAJOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f1)
  94   CC_VER_MINOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f2)
  95 else
  96   # -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
  97   # prints the numbers (e.g. "2.95", "3.2.1")
  98   CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
  99   CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
 100 endif
 101 
 102 ifeq ($(USE_CLANG), true)
 103   # Clang has precompiled headers support by default, but the user can switch
 104   # it off by using 'USE_PRECOMPILED_HEADER=0'.
 105   ifdef LP64
 106     ifeq ($(USE_PRECOMPILED_HEADER),)
 107       USE_PRECOMPILED_HEADER=1
 108     endif
 109   else
 110     # We don't support precompiled headers on 32-bit builds because there some files are
 111     # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
 112     # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
 113     USE_PRECOMPILED_HEADER=0
 114   endif
 115   
 116   ifeq ($(USE_PRECOMPILED_HEADER),1)
 117   
 118     ifndef LP64
 119       $(error " Precompiled Headers only supported on 64-bit platforms!")
 120     endif
 121   
 122     PRECOMPILED_HEADER_DIR=.
 123     PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp


 249 ifneq ($(COMPILER_WARNINGS_FATAL),false)
 250   WARNINGS_ARE_ERRORS = -Werror
 251 endif
 252 
 253 ifeq ($(USE_CLANG), true)
 254   # However we need to clean the code up before we can unrestrictedly enable this option with Clang
 255   WARNINGS_ARE_ERRORS += -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses
 256   WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-compare
 257 # Not yet supported by clang in Xcode 4.6.2
 258 #  WARNINGS_ARE_ERRORS += -Wno-tautological-constant-out-of-range-compare
 259   WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess
 260   WARNINGS_ARE_ERRORS += -Wno-empty-body
 261 endif
 262 
 263 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value
 264 
 265 ifeq ($(USE_CLANG),)
 266   # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
 267   # conversions which might affect the values. Only enable it in earlier versions.
 268   ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
 269     WARNING_FLAGS += -Wconversion
 270   endif
 271 endif
 272 
 273 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
 274 # Special cases
 275 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 
 276 # XXXDARWIN: for _dyld_bind_fully_image_containing_address
 277 ifeq ($(OS_VENDOR), Darwin)
 278   CFLAGS_WARN/os_bsd.o = $(CFLAGS_WARN/DEFAULT) -Wno-deprecated-declarations
 279 endif
 280 
 281 # optimization control flags (Used by fastdebug and release variants)
 282 OPT_CFLAGS/NOOPT=-O0
 283 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 8 \) \))" "1"
 284   # Allow basic optimizations which don't distrupt debugging. (Principally dead code elimination)
 285   OPT_CFLAGS/DEBUG=-Og
 286 else
 287   # Allow no optimizations.
 288   OPT_CFLAGS/DEBUG=-O0
 289 endif
 290 OPT_CFLAGS/SIZE=-Os
 291 OPT_CFLAGS/SPEED=-O3
 292 






 293 ifeq ($(OS_VENDOR), Darwin)
 294   # use -Os by default, unless -O3 can be proved to be worth the cost, as per policy
 295   # <https://wiki.openjdk.java.net/display/MacOSXPort/Compiler+Errata>
 296   OPT_CFLAGS_DEFAULT ?= SIZE
 297 else
 298   OPT_CFLAGS_DEFAULT ?= SPEED
 299 endif
 300 
 301 # Hotspot uses very unstrict aliasing turn this optimization off
 302 # This option is added to CFLAGS rather than OPT_CFLAGS
 303 # so that OPT_CFLAGS overrides get this option too.
 304 CFLAGS += -fno-strict-aliasing
 305 
 306 ifdef OPT_CFLAGS
 307   ifneq ("$(origin OPT_CFLAGS)", "command line")
 308     $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
 309   endif
 310 endif
 311 
 312 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
 313 
 314 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp
 315 # if we use expensive-optimizations
 316 ifeq ($(BUILDARCH), ia64)
 317 OPT_CFLAGS += -fno-expensive-optimizations
 318 endif
 319 


 320 # Work around some compiler bugs.
 321 ifeq ($(USE_CLANG), true)
 322   ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
 323     OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
 324     OPT_CFLAGS/unsafe.o += -O1
 325   endif
 326 else
 327   # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
 328   ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
 329     OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
 330   endif
 331 endif
 332 
 333 # Flags for generating make dependency flags.
 334 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
 335 ifeq ($(USE_CLANG),)
 336   ifneq ($(CC_VER_MAJOR), 2)
 337     DEPFLAGS += -fpch-deps
 338   endif
 339 endif


 355   CFLAGS += -DMAC_OS_X_VERSION_MAX_ALLOWED=$(subst .,,$(MACOSX_VERSION_MIN)) \
 356             -mmacosx-version-min=$(MACOSX_VERSION_MIN)
 357   LDFLAGS += -mmacosx-version-min=$(MACOSX_VERSION_MIN)
 358 endif
 359 
 360 
 361 #------------------------------------------------------------------------
 362 # Assembler flags
 363 
 364 # Enforce prerpocessing of .s files
 365 ASFLAGS += -x assembler-with-cpp
 366 
 367 #------------------------------------------------------------------------
 368 # Linker flags
 369 
 370 # statically link libstdc++.so, work with gcc but ignored by g++
 371 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
 372 
 373 ifeq ($(USE_CLANG),)
 374   # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
 375   ifneq ($(CC_VER_MAJOR), 2)
 376     STATIC_LIBGCC += -static-libgcc
 377   endif
 378 
 379   # Enable linker optimization
 380   LFLAGS += -Xlinker -O1
 381 
 382   ifeq ($(VARIANT), DBG)
 383     # for relocations read-only
 384     LFLAGS += -Wl,-z,relro
 385 
 386     ifeq ($(FASTDEBUG), false)
 387       # disable incremental relocations linking
 388       LFLAGS += -Wl,-z,now
 389     endif
 390   endif
 391 
 392   ifeq ($(BUILDARCH), ia64)
 393     LFLAGS += -Wl,-relax
 394   endif
 395 endif
 396 
 397 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
 398 MAPFLAG = -Xlinker --version-script=FILENAME
 399 
 400 #
 401 # Shared Library
 402 #
 403 ifeq ($(OS_VENDOR), Darwin)
 404   # Standard linker flags
 405   LFLAGS +=
 406 
 407   # The apple linker has its own variant of mapfiles/version-scripts
 408   MAPFLAG = -Xlinker -exported_symbols_list -Xlinker FILENAME
 409 
 410   # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
 411   SONAMEFLAG =


 422   # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
 423   SONAMEFLAG = -Xlinker -soname=SONAME
 424 
 425   # Build shared library
 426   SHARED_FLAG = -shared $(VM_PICFLAG)
 427 
 428   # Keep symbols even they are not used
 429   AOUT_FLAGS += -Xlinker -export-dynamic
 430 endif
 431 
 432 #------------------------------------------------------------------------
 433 # Debug flags
 434 
 435 ifeq ($(USE_CLANG), true)
 436   # Restrict the debug information created by Clang to avoid
 437   # too big object files and speed the build up a little bit
 438   # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
 439   CFLAGS += -flimit-debug-info
 440 endif
 441 
 442 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 8 \) \))" "1"
 443   # Allow basic optimizations which don't distrupt debugging. (Principally dead code elimination)
 444   DEBUG_CFLAGS=-Og
 445 else
 446   # Allow no optimizations.
 447   DEBUG_CFLAGS=-O0
 448 endif
 449 
 450 # DEBUG_BINARIES uses full -g debug information for all configs
 451 ifeq ($(DEBUG_BINARIES), true)
 452   CFLAGS += -g
 453 else
 454   # Use the stabs format for debugging information (this is the default
 455   # on gcc-2.91). It's good enough, has all the information about line
 456   # numbers and local variables, and libjvm.so is only about 16M.
 457   # Change this back to "-g" if you want the most expressive format.
 458   # (warning: that could easily inflate libjvm.so to 150M!)
 459   # Note: The Itanium gcc compiler crashes when using -gstabs.
 460   DEBUG_CFLAGS/ia64  = -g
 461   DEBUG_CFLAGS/amd64 = -g
 462   DEBUG_CFLAGS/arm   = -g
 463   DEBUG_CFLAGS/ppc   = -g
 464   DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
 465   ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
 466       ifeq ($(USE_CLANG), true)
 467         # Clang doesn't understand -gstabs
 468         DEBUG_CFLAGS += -g
 469       else
 470         DEBUG_CFLAGS += -gstabs
 471       endif
 472   endif
 473   
 474   ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
 475     FASTDEBUG_CFLAGS/ia64  = -g
 476     FASTDEBUG_CFLAGS/amd64 = -g
 477     FASTDEBUG_CFLAGS/arm   = -g
 478     FASTDEBUG_CFLAGS/ppc   = -g
 479     FASTDEBUG_CFLAGS += $(FASTDEBUG_CFLAGS/$(BUILDARCH))
 480     ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
 481       ifeq ($(USE_CLANG), true)
 482         # Clang doesn't understand -gstabs
 483         FASTDEBUG_CFLAGS += -g
 484       else
 485         FASTDEBUG_CFLAGS += -gstabs
 486       endif
 487     endif
 488   
 489     OPT_CFLAGS/ia64  = -g
 490     OPT_CFLAGS/amd64 = -g
 491     OPT_CFLAGS/arm   = -g
 492     OPT_CFLAGS/ppc   = -g
 493     OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
 494     ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
 495       ifeq ($(USE_CLANG), true)
 496         # Clang doesn't understand -gstabs
 497         OPT_CFLAGS += -g
 498       else
 499         OPT_CFLAGS += -gstabs
 500       endif
 501     endif
 502   endif
 503 endif
 504 
 505 # Enable bounds checking.
 506 ifeq ($(VARIANT), DBG)
 507   # _FORTIFY_SOURCE appears in GCC 4.0+
 508   ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) )" "0"
 509     ifeq ($(FASTDEBUG), true)
 510       # compile time size bounds checks
 511       CFLAGS += -D_FORTIFY_SOURCE=1
 512     else
 513       # and runtime size bounds checks and paranoid stack smashing checks.
 514       CFLAGS += -D_FORTIFY_SOURCE=2 -fstack-protector-all --param ssp-buffer-size=1
 515     endif
 516   endif
 517 endif
 518 
 519 # If we are building HEADLESS, pass on to VM
 520 # so it can set the java.awt.headless property
 521 ifdef HEADLESS
 522 CFLAGS += -DHEADLESS
 523 endif
 524 
 525 # We are building Embedded for a small device
 526 # favor code space over speed
 527 ifdef MINIMIZE_RAM_USAGE
 528 CFLAGS += -DMINIMIZE_RAM_USAGE
 529 endif