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