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 OS_VENDOR = $(shell uname -s) 26 27 #------------------------------------------------------------------------ 28 # CC, CXX & AS 29 30 # If a SPEC is not set already, then use these defaults. 31 ifeq ($(SPEC),) 32 # When cross-compiling the ALT_COMPILER_PATH points 33 # to the cross-compilation toolset 34 ifdef CROSS_COMPILE_ARCH 35 CXX = $(ALT_COMPILER_PATH)/g++ 36 CC = $(ALT_COMPILER_PATH)/gcc 37 HOSTCXX = g++ 38 HOSTCC = gcc 39 else ifneq ($(OS_VENDOR), Darwin) 40 CXX = g++ 41 CC = gcc 42 HOSTCXX = $(CXX) 43 HOSTCC = $(CC) 44 endif 45 46 # i486 hotspot requires -mstackrealign on Darwin. 47 # llvm-gcc supports this in Xcode 3.2.6 and 4.0. 48 # gcc-4.0 supports this on earlier versions. 49 # Prefer llvm-gcc where available. 50 ifeq ($(OS_VENDOR), Darwin) 51 ifeq ($(origin CXX), default) 52 CXX = llvm-g++ 53 endif 54 ifeq ($(origin CC), default) 55 CC = llvm-gcc 56 endif 57 58 ifeq ($(ARCH), i486) 59 LLVM_SUPPORTS_STACKREALIGN := $(shell \ 60 [ "0"`llvm-gcc -v 2>&1 | grep LLVM | sed -E "s/.*LLVM build ([0-9]+).*/\1/"` -gt "2333" ] \ 61 && echo true || echo false) 62 63 ifeq ($(LLVM_SUPPORTS_STACKREALIGN), true) 64 CXX32 ?= llvm-g++ 65 CC32 ?= llvm-gcc 66 else 67 CXX32 ?= g++-4.0 68 CC32 ?= gcc-4.0 69 endif 70 CXX = $(CXX32) 71 CC = $(CC32) 72 endif 73 74 ifeq ($(USE_CLANG), true) 75 CXX = clang++ 76 CC = clang 77 endif 78 79 HOSTCXX = $(CXX) 80 HOSTCC = $(CC) 81 endif 82 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 CC_VER_MICRO := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f3) 101 endif 102 103 ifeq ($(USE_CLANG), true) 104 # Clang has precompiled headers support by default, but the user can switch 105 # it off by using 'USE_PRECOMPILED_HEADER=0'. 106 ifdef LP64 107 ifeq ($(USE_PRECOMPILED_HEADER),) 108 USE_PRECOMPILED_HEADER=1 109 endif 110 else 111 # We don't support precompiled headers on 32-bit builds because there some files are 112 # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make) 113 # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit. 114 USE_PRECOMPILED_HEADER=0 115 endif 116 117 ifeq ($(USE_PRECOMPILED_HEADER),1) 118 119 ifndef LP64 120 $(error " Precompiled Headers only supported on 64-bit platforms!") 121 endif 122 123 PRECOMPILED_HEADER_DIR=. 124 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp 125 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.pch 126 127 PCH_FLAG = -include precompiled.hpp 128 PCH_FLAG/DEFAULT = $(PCH_FLAG) 129 PCH_FLAG/NO_PCH = -DNO_PCH 130 PCH_FLAG/BY_FILE = $(PCH_FLAG/$@)$(PCH_FLAG/DEFAULT$(PCH_FLAG/$@)) 131 132 VM_PCH_FLAG/LIBJVM = $(PCH_FLAG/BY_FILE) 133 VM_PCH_FLAG/AOUT = 134 VM_PCH_FLAG = $(VM_PCH_FLAG/$(LINK_INTO)) 135 136 # We only use precompiled headers for the JVM build 137 CFLAGS += $(VM_PCH_FLAG) 138 139 # The following files are compiled at various optimization 140 # levels due to optimization issues encountered at the 141 # 'OPT_CFLAGS_DEFAULT' level. The Clang compiler issues a compile 142 # time error if there is an optimization level specification 143 # skew between the PCH file and the C++ file. Especially if the 144 # PCH file is compiled at a higher optimization level than 145 # the C++ file. One solution might be to prepare extra optimization 146 # level specific PCH files for the opt build and use them here, but 147 # it's probably not worth the effort as long as only a few files 148 # need this special handling. 149 PCH_FLAG/loopTransform.o = $(PCH_FLAG/NO_PCH) 150 PCH_FLAG/sharedRuntimeTrig.o = $(PCH_FLAG/NO_PCH) 151 PCH_FLAG/sharedRuntimeTrans.o = $(PCH_FLAG/NO_PCH) 152 PCH_FLAG/unsafe.o = $(PCH_FLAG/NO_PCH) 153 PCH_FLAG/jvmciCompilerToVM.o = $(PCH_FLAG/NO_PCH) 154 155 endif 156 else # ($(USE_CLANG), true) 157 # check for precompiled headers support 158 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0" 159 # Allow the user to turn off precompiled headers from the command line. 160 ifneq ($(USE_PRECOMPILED_HEADER),0) 161 PRECOMPILED_HEADER_DIR=. 162 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp 163 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch 164 endif 165 endif 166 endif 167 168 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp. 169 ifeq ($(USE_PRECOMPILED_HEADER),0) 170 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER 171 endif 172 173 #------------------------------------------------------------------------ 174 # Compiler flags 175 176 # position-independent code 177 PICFLAG = -fPIC 178 179 VM_PICFLAG/LIBJVM = $(PICFLAG) 180 VM_PICFLAG/AOUT = 181 VM_PICFLAG = $(VM_PICFLAG/$(LINK_INTO)) 182 183 ifeq ($(JVM_VARIANT_ZERO), true) 184 CFLAGS += $(LIBFFI_CFLAGS) 185 endif 186 ifeq ($(JVM_VARIANT_ZEROSHARK), true) 187 CFLAGS += $(LIBFFI_CFLAGS) 188 CFLAGS += $(LLVM_CFLAGS) 189 endif 190 191 ifeq ($(STATIC_BUILD),true) 192 CXXFLAGS += -DSTATIC_BUILD 193 CFLAGS += -DSTATIC_BUILD 194 else 195 CFLAGS += $(VM_PICFLAG) 196 endif 197 198 CFLAGS += -fno-rtti 199 CFLAGS += -fno-exceptions 200 ifeq ($(USE_CLANG),) 201 CFLAGS += -pthread 202 CFLAGS += -fcheck-new 203 # version 4 and above support fvisibility=hidden (matches jni_x86.h file) 204 # except 4.1.2 gives pointless warnings that can't be disabled (afaik) 205 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0" 206 CFLAGS += -fvisibility=hidden 207 endif 208 else 209 CFLAGS += -fvisibility=hidden 210 endif 211 212 ifeq ($(USE_CLANG), true) 213 # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm' 214 # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment') 215 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0" 216 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16 217 else 218 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm -stack-alignment=16 219 endif 220 endif 221 222 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH)) 223 ARCHFLAG/i486 = -m32 -march=i586 224 ARCHFLAG/amd64 = -m64 $(STACK_ALIGNMENT_OPT) 225 ARCHFLAG/ia64 = 226 ARCHFLAG/sparc = -m32 -mcpu=v9 227 ARCHFLAG/sparcv9 = -m64 -mcpu=v9 228 ARCHFLAG/zero = $(ZERO_ARCHFLAG) 229 230 # Darwin-specific build flags 231 ifeq ($(OS_VENDOR), Darwin) 232 # Ineffecient 16-byte stack re-alignment on Darwin/IA32 233 ARCHFLAG/i486 += -mstackrealign 234 endif 235 236 CFLAGS += $(ARCHFLAG) 237 AOUT_FLAGS += $(ARCHFLAG) 238 LFLAGS += $(ARCHFLAG) 239 ASFLAGS += $(ARCHFLAG) 240 241 ifdef E500V2 242 CFLAGS += -DE500V2 243 endif 244 245 # Use C++ Interpreter 246 ifdef CC_INTERP 247 CFLAGS += -DCC_INTERP 248 endif 249 250 # Keep temporary files (.ii, .s) 251 ifdef NEED_ASM 252 CFLAGS += -save-temps 253 else 254 CFLAGS += -pipe 255 endif 256 257 # Compiler warnings are treated as errors 258 ifneq ($(COMPILER_WARNINGS_FATAL),false) 259 WARNINGS_ARE_ERRORS ?= -Werror 260 endif 261 262 ifeq ($(USE_CLANG), true) 263 # However we need to clean the code up before we can unrestrictedly enable this option with Clang 264 WARNINGS_ARE_ERRORS += -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses 265 WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-compare 266 # Not yet supported by clang in Xcode 4.6.2 267 # WARNINGS_ARE_ERRORS += -Wno-tautological-constant-out-of-range-compare 268 WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess 269 WARNINGS_ARE_ERRORS += -Wno-empty-body 270 endif 271 272 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wformat=2 273 274 ifeq ($(USE_CLANG),) 275 # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit 276 # conversions which might affect the values. Only enable it in earlier versions. 277 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0" 278 WARNINGS_FLAGS += -Wconversion 279 endif 280 endif 281 282 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS) 283 # Special cases 284 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 285 # XXXDARWIN: for _dyld_bind_fully_image_containing_address 286 ifeq ($(OS_VENDOR), Darwin) 287 CFLAGS_WARN/os_bsd.o = $(CFLAGS_WARN/DEFAULT) -Wno-deprecated-declarations 288 endif 289 290 # optimization control flags (Used by fastdebug and release variants) 291 OPT_CFLAGS/NOOPT=-O0 292 OPT_CFLAGS/DEBUG=-O0 293 OPT_CFLAGS/SIZE=-Os 294 OPT_CFLAGS/SPEED=-O3 295 296 ifeq ($(OS_VENDOR), Darwin) 297 # use -Os by default, unless -O3 can be proved to be worth the cost, as per policy 298 # <https://wiki.openjdk.java.net/display/MacOSXPort/Compiler+Errata> 299 OPT_CFLAGS_DEFAULT ?= SIZE 300 else 301 OPT_CFLAGS_DEFAULT ?= SPEED 302 endif 303 304 # Hotspot uses very unstrict aliasing turn this optimization off 305 # This option is added to CFLAGS rather than OPT_CFLAGS 306 # so that OPT_CFLAGS overrides get this option too. 307 CFLAGS += -fno-strict-aliasing 308 309 ifdef OPT_CFLAGS 310 ifneq ("$(origin OPT_CFLAGS)", "command line") 311 $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.") 312 endif 313 endif 314 315 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS) 316 317 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp 318 # if we use expensive-optimizations 319 ifeq ($(BUILDARCH), ia64) 320 OPT_CFLAGS += -fno-expensive-optimizations 321 endif 322 323 # Work around some compiler bugs. 324 ifeq ($(USE_CLANG), true) 325 # Clang < 6 | <= 6.1 | <= 7.0 326 ifeq ($(shell expr \ 327 $(CC_VER_MAJOR) \< 6 \| \ 328 \( $(CC_VER_MAJOR) = 6 \& $(CC_VER_MINOR) \<= 1 \) \| \ 329 \( $(CC_VER_MAJOR) = 7 \& $(CC_VER_MINOR) \<= 0 \) \ 330 ), 1) 331 OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT) 332 OPT_CFLAGS/unsafe.o += -O1 333 else 334 $(error "Update compiler workarounds for Clang $(CC_VER_MAJOR).$(CC_VER_MINOR)") 335 endif 336 else 337 # Do not allow GCC 4.1.1 338 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 1 \& $(CC_VER_MICRO) = 1), 1) 339 $(error "GCC $(CC_VER_MAJOR).$(CC_VER_MINOR).$(CC_VER_MICRO) not supported because of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=27724") 340 endif 341 # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation. 342 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1) 343 OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT) 344 endif 345 endif 346 347 # Flags for generating make dependency flags. 348 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d) 349 ifeq ($(USE_CLANG),) 350 ifneq ($(CC_VER_MAJOR), 2) 351 DEPFLAGS += -fpch-deps 352 endif 353 endif 354 355 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp. 356 ifeq ($(USE_PRECOMPILED_HEADER),0) 357 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER 358 endif 359 360 ifeq ($(OS_VENDOR), Darwin) 361 # Setting these parameters makes it an error to link to macosx APIs that are 362 # newer than the given OS version and makes the linked binaries compatible even 363 # if built on a newer version of the OS. 364 # The expected format is X.Y.Z 365 ifeq ($(MACOSX_VERSION_MIN),) 366 MACOSX_VERSION_MIN=10.7.0 367 endif 368 # The macro takes the version with no dots, ex: 1070 369 CFLAGS += -DMAC_OS_X_VERSION_MAX_ALLOWED=$(subst .,,$(MACOSX_VERSION_MIN)) \ 370 -mmacosx-version-min=$(MACOSX_VERSION_MIN) 371 LDFLAGS += -mmacosx-version-min=$(MACOSX_VERSION_MIN) 372 endif 373 374 375 #------------------------------------------------------------------------ 376 # Assembler flags 377 378 # Enforce prerpocessing of .s files 379 ASFLAGS += -x assembler-with-cpp 380 381 #------------------------------------------------------------------------ 382 # Linker flags 383 384 # statically link libstdc++.so, work with gcc but ignored by g++ 385 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic 386 387 # Ensure use libstdc++ on clang, not libc++ 388 ifeq ($(USE_CLANG), true) 389 LFLAGS += -stdlib=libstdc++ 390 endif 391 392 ifeq ($(USE_CLANG),) 393 # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x. 394 ifneq ($(CC_VER_MAJOR), 2) 395 STATIC_LIBGCC += -static-libgcc 396 endif 397 398 ifneq ($(OS_VENDOR), Darwin) 399 ifneq (, findstring(debug,$(BUILD_FLAVOR))) 400 # for relocations read-only 401 LFLAGS += -Xlinker -z -Xlinker relro 402 403 ifeq ($(BUILD_FLAVOR), debug) 404 # disable incremental relocations linking 405 LFLAGS += -Xlinker -z -Xlinker now 406 endif 407 endif 408 endif 409 410 ifeq ($(BUILDARCH), ia64) 411 LFLAGS += -Wl,-relax 412 endif 413 endif 414 415 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file. 416 MAPFLAG = -Xlinker --version-script=FILENAME 417 418 # 419 # Shared Library 420 # 421 ifeq ($(OS_VENDOR), Darwin) 422 # Standard linker flags 423 LFLAGS += 424 425 # The apple linker has its own variant of mapfiles/version-scripts 426 MAPFLAG = -Xlinker -exported_symbols_list -Xlinker FILENAME 427 428 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj 429 SONAMEFLAG = 430 431 # Build shared library 432 SHARED_FLAG = -Wl,-install_name,@rpath/$(@F) -dynamiclib -compatibility_version 1.0.0 -current_version 1.0.0 $(VM_PICFLAG) 433 434 # Keep symbols even they are not used 435 #AOUT_FLAGS += -Xlinker -export-dynamic 436 else 437 # Enable linker optimization 438 LFLAGS += -Xlinker -O1 439 440 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj 441 SONAMEFLAG = -Xlinker -soname=SONAME 442 443 # Build shared library 444 SHARED_FLAG = -shared $(VM_PICFLAG) 445 446 # Keep symbols even they are not used 447 AOUT_FLAGS += -Xlinker -export-dynamic 448 endif 449 450 #------------------------------------------------------------------------ 451 # Debug flags 452 453 ifeq ($(USE_CLANG), true) 454 # Restrict the debug information created by Clang to avoid 455 # too big object files and speed the build up a little bit 456 # (see http://llvm.org/bugs/show_bug.cgi?id=7554) 457 CFLAGS += -flimit-debug-info 458 endif 459 460 # Allow no optimizations. 461 DEBUG_CFLAGS=-O0 462 463 # DEBUG_BINARIES uses full -g debug information for all configs 464 ifeq ($(DEBUG_BINARIES), true) 465 CFLAGS += -g 466 else 467 # Use the stabs format for debugging information (this is the default 468 # on gcc-2.91). It's good enough, has all the information about line 469 # numbers and local variables, and libjvm.so is only about 16M. 470 # Change this back to "-g" if you want the most expressive format. 471 # (warning: that could easily inflate libjvm.so to 150M!) 472 # Note: The Itanium gcc compiler crashes when using -gstabs. 473 DEBUG_CFLAGS/ia64 = -g 474 DEBUG_CFLAGS/amd64 = -g 475 DEBUG_CFLAGS/arm = -g 476 DEBUG_CFLAGS/ppc = -g 477 DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH)) 478 ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),) 479 ifeq ($(USE_CLANG), true) 480 # Clang doesn't understand -gstabs 481 DEBUG_CFLAGS += -g 482 else 483 DEBUG_CFLAGS += -gstabs 484 endif 485 endif 486 487 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1) 488 FASTDEBUG_CFLAGS/ia64 = -g 489 FASTDEBUG_CFLAGS/amd64 = -g 490 FASTDEBUG_CFLAGS/arm = -g 491 FASTDEBUG_CFLAGS/ppc = -g 492 FASTDEBUG_CFLAGS += $(FASTDEBUG_CFLAGS/$(BUILDARCH)) 493 ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),) 494 ifeq ($(USE_CLANG), true) 495 # Clang doesn't understand -gstabs 496 FASTDEBUG_CFLAGS += -g 497 else 498 FASTDEBUG_CFLAGS += -gstabs 499 endif 500 endif 501 502 OPT_CFLAGS/ia64 = -g 503 OPT_CFLAGS/amd64 = -g 504 OPT_CFLAGS/arm = -g 505 OPT_CFLAGS/ppc = -g 506 OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH)) 507 ifeq ($(OPT_CFLAGS/$(BUILDARCH)),) 508 ifeq ($(USE_CLANG), true) 509 # Clang doesn't understand -gstabs 510 OPT_CFLAGS += -g 511 else 512 OPT_CFLAGS += -gstabs 513 endif 514 endif 515 endif 516 endif 517 518 ifeq ($(USE_CLANG),) 519 # Enable bounds checking. 520 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) )" "1" 521 # stack smashing checks. 522 DEBUG_CFLAGS += -fstack-protector-all --param ssp-buffer-size=1 523 endif 524 endif 525 526 # If we are building HEADLESS, pass on to VM 527 # so it can set the java.awt.headless property 528 ifdef HEADLESS 529 CFLAGS += -DHEADLESS 530 endif 531 532 # We are building Embedded for a small device 533 # favor code space over speed 534 ifdef MINIMIZE_RAM_USAGE 535 CFLAGS += -DMINIMIZE_RAM_USAGE 536 endif