1 #
2 # Copyright (c) 1999, 2016, 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 CC_VER_MICRO := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f3)
64 # Workaround Ubuntu bug where -dumpversion doesn't print a micro version
65 # https://bugs.launchpad.net/ubuntu/+source/gcc-4.8/+bug/1360404
66 ifeq ($(CC_VER_MICRO),)
67 CC_VER_MICRO := "0"
68 endif
69 endif
70
71 ifeq ($(USE_CLANG), true)
72 # Clang has precompiled headers support by default, but the user can switch
73 # it off by using 'USE_PRECOMPILED_HEADER=0'.
74 ifdef LP64
75 ifeq ($(USE_PRECOMPILED_HEADER),)
76 USE_PRECOMPILED_HEADER=1
77 endif
78 else
79 # We don't support precompiled headers on 32-bit builds because there some files are
80 # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
81 # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
82 USE_PRECOMPILED_HEADER=0
83 endif
84
85 ifeq ($(USE_PRECOMPILED_HEADER),1)
86
87 ifndef LP64
88 $(error " Precompiled Headers only supported on 64-bit platforms!")
89 endif
90
91 PRECOMPILED_HEADER_DIR=.
92 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
93 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.pch
94
95 PCH_FLAG = -include precompiled.hpp
96 PCH_FLAG/DEFAULT = $(PCH_FLAG)
97 PCH_FLAG/NO_PCH = -DNO_PCH
98 PCH_FLAG/BY_FILE = $(PCH_FLAG/$@)$(PCH_FLAG/DEFAULT$(PCH_FLAG/$@))
99
100 VM_PCH_FLAG/LIBJVM = $(PCH_FLAG/BY_FILE)
101 VM_PCH_FLAG/AOUT =
102 VM_PCH_FLAG = $(VM_PCH_FLAG/$(LINK_INTO))
103
104 # We only use precompiled headers for the JVM build
105 CFLAGS += $(VM_PCH_FLAG)
106
107 # There are some files which don't like precompiled headers
108 # The following files are build with 'OPT_CFLAGS/NOOPT' (-O0) in the opt build.
109 # But Clang doesn't support a precompiled header which was compiled with -O3
110 # to be used in a compilation unit which uses '-O0'. We could also prepare an
111 # extra '-O0' PCH file for the opt build and use it here, but it's probably
112 # not worth the effort as long as only two files need this special handling.
113 PCH_FLAG/loopTransform.o = $(PCH_FLAG/NO_PCH)
114 PCH_FLAG/sharedRuntimeTrig.o = $(PCH_FLAG/NO_PCH)
115 PCH_FLAG/sharedRuntimeTrans.o = $(PCH_FLAG/NO_PCH)
116
117 endif
118 else # ($(USE_CLANG), true)
119 # check for precompiled headers support
120 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
121 # Allow the user to turn off precompiled headers from the command line.
122 ifneq ($(USE_PRECOMPILED_HEADER),0)
123 PRECOMPILED_HEADER_DIR=.
124 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
125 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
126 endif
127 endif
128 endif
129
130 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
131 ifeq ($(USE_PRECOMPILED_HEADER),0)
132 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
133 endif
134
135
136 #------------------------------------------------------------------------
137 # Compiler flags
138
139 # position-independent code
140 PICFLAG = -fPIC
141
142 VM_PICFLAG/LIBJVM = $(PICFLAG)
143 VM_PICFLAG/AOUT =
144 VM_PICFLAG = $(VM_PICFLAG/$(LINK_INTO))
145
146 ifeq ($(JVM_VARIANT_ZERO), true)
147 CFLAGS += $(LIBFFI_CFLAGS)
148 endif
149 ifeq ($(JVM_VARIANT_ZEROSHARK), true)
150 CFLAGS += $(LIBFFI_CFLAGS)
151 CFLAGS += $(LLVM_CFLAGS)
152 endif
153 CFLAGS += $(VM_PICFLAG)
154 CFLAGS += -fno-rtti
155 CFLAGS += -fno-exceptions
156 CFLAGS += -D_REENTRANT
157 ifeq ($(USE_CLANG),)
158 CFLAGS += -fcheck-new
159 # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
160 # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
161 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
162 CFLAGS += -fvisibility=hidden
163 endif
164 else
165 CFLAGS += -fvisibility=hidden
166 endif
167
168 ifeq ($(USE_CLANG), true)
169 # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm'
170 # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment')
171 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0"
172 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16
173 else
174 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm -stack-alignment=16
175 endif
176 endif
177
178 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
179 ARCHFLAG/i486 = -m32 -march=i586
180 ARCHFLAG/amd64 = -m64 $(STACK_ALIGNMENT_OPT)
181 ARCHFLAG/aarch64 =
182 ARCHFLAG/ia64 =
183 ARCHFLAG/sparc = -m32 -mcpu=v9
184 ARCHFLAG/sparcv9 = -m64 -mcpu=v9
185 ARCHFLAG/zero = $(ZERO_ARCHFLAG)
186 ARCHFLAG/ppc64 = -m64
187
188 CFLAGS += $(ARCHFLAG)
189 AOUT_FLAGS += $(ARCHFLAG)
190 LFLAGS += $(ARCHFLAG)
191 ASFLAGS += $(ARCHFLAG)
192
193 # Use C++ Interpreter
194 ifdef CC_INTERP
195 CFLAGS += -DCC_INTERP
196 endif
197
198 # Keep temporary files (.ii, .s)
199 ifdef NEED_ASM
200 CFLAGS += -save-temps
201 else
202 CFLAGS += -pipe
203 endif
204
205 # Compiler warnings are treated as errors
206 WARNINGS_ARE_ERRORS ?= -Werror
207
208 ifeq ($(USE_CLANG), true)
209 # However we need to clean the code up before we can unrestrictedly enable this option with Clang
210 WARNINGS_ARE_ERRORS += -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses
211 WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-constant-out-of-range-compare -Wno-tautological-compare
212 WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess
213 WARNINGS_ARE_ERRORS += -Wno-return-type -Wno-empty-body
214 endif
215
216 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value -Wformat=2 -Wreturn-type -Woverloaded-virtual
217
218 ifeq ($(USE_CLANG),)
219 # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
220 # conversions which might affect the values. Only enable it in earlier versions.
221 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
222 # GCC < 4.3
223 WARNING_FLAGS += -Wconversion
224 endif
225 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 8 \) \))" "1"
226 # GCC >= 4.8
227 # This flag is only known since GCC 4.3. Gcc 4.8 contains a fix so that with templates no
228 # warnings are issued: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11856
229 WARNING_FLAGS += -Wtype-limits
230 # GCC < 4.8 don't accept this flag for C++.
231 WARNING_FLAGS += -Wno-format-zero-length
232 # GCC 4.8 reports less false positives than the older compilers.
233 WARNING_FLAGS += -Wuninitialized
234 endif
235 endif
236
237 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
238
239 # Special cases
240 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@))
241
242 # optimization control flags (Used by fastdebug and release variants)
243 OPT_CFLAGS/NOOPT=-O0
244 OPT_CFLAGS/DEBUG=-O0
245 OPT_CFLAGS/SIZE=-Os
246 OPT_CFLAGS/SPEED=-O3
247
248 OPT_CFLAGS_DEFAULT ?= SPEED
249
250 # Hotspot uses very unstrict aliasing turn this optimization off
251 # This option is added to CFLAGS rather than OPT_CFLAGS
252 # so that OPT_CFLAGS overrides get this option too.
253 CFLAGS += -fno-strict-aliasing
254
255 ifdef OPT_CFLAGS
256 ifneq ("$(origin OPT_CFLAGS)", "command line")
257 $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
258 endif
259 endif
260
261 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
262
263 # Variable tracking size limit exceeded for VMStructs::init()
264 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "1"
265 # GCC >= 4.3
266 # Gcc 4.1.2 does not support this flag, nor does it have problems compiling the file.
267 OPT_CFLAGS/vmStructs.o += -fno-var-tracking-assignments
268 # The debug flag is added to OPT_CFLAGS, but lost in case of per-file overrides
269 # of OPT_CFLAGS. Restore it here.
270 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
271 OPT_CFLAGS/vmStructs.o += -g
272 endif
273 endif
274
275 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp
276 # if we use expensive-optimizations
277 ifeq ($(BUILDARCH), ia64)
278 OPT_CFLAGS += -fno-expensive-optimizations
279 endif
280
281 # Work around some compiler bugs.
282 ifeq ($(USE_CLANG), true)
283 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
284 OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
285 # The debug flag is added to OPT_CFLAGS, but lost in case of per-file overrides
286 # of OPT_CFLAGS. Restore it here.
287 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
288 OPT_CFLAGS/loopTransform.o += -g
289 endif
290 endif
291 else
292 # Do not allow GCC 4.1.1
293 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 1 \& $(CC_VER_MICRO) = 1), 1)
294 $(error "GCC $(CC_VER_MAJOR).$(CC_VER_MINOR).$(CC_VER_MICRO) not supported because of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=27724")
295 endif
296 # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
297 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
298 OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
299 endif
300 endif
301
302 # Flags for generating make dependency flags.
303 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
304 ifeq ($(USE_CLANG),)
305 ifneq ($(CC_VER_MAJOR), 2)
306 DEPFLAGS += -fpch-deps
307 endif
308 endif
309
310 #------------------------------------------------------------------------
311 # Linker flags
312
313 # statically link libstdc++.so, work with gcc but ignored by g++
314 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
315
316 # Enable linker optimization
317 LFLAGS += -Xlinker -O1
318
319 ifeq ($(USE_CLANG),)
320 STATIC_LIBGCC += -static-libgcc
321
322 ifneq (, findstring(debug,$(BUILD_FLAVOR)))
323 # for relocations read-only
324 LFLAGS += -Xlinker -z -Xlinker relro
325
326 ifeq ($(BUILD_FLAVOR), debug)
327 # disable incremental relocations linking
328 LFLAGS += -Xlinker -z -Xlinker now
329 endif
330 endif
331
332 ifeq ($(BUILDARCH), ia64)
333 LFLAGS += -Wl,-relax
334 endif
335
336 # If this is a --hash-style=gnu system, use --hash-style=both
337 # The gnu .hash section won't work on some Linux systems like SuSE 10.
338 _HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
339 ifneq ($(_HAS_HASH_STYLE_GNU),)
340 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
341 endif
342 else
343 # Don't know how to find out the 'hash style' of a system as '-dumpspecs'
344 # doesn't work for Clang. So for now we'll alwys use --hash-style=both
345 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
346 endif
347
348 LFLAGS += $(LDFLAGS_HASH_STYLE)
349
350 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
351 MAPFLAG = -Xlinker --version-script=FILENAME
352
353 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
354 SONAMEFLAG = -Xlinker -soname=SONAME
355
356 # Build shared library
357 SHARED_FLAG = -shared
358
359 # Keep symbols even they are not used
360 AOUT_FLAGS += -Xlinker -export-dynamic
361
362 #------------------------------------------------------------------------
363 # Debug flags
364
365 ifeq ($(USE_CLANG), true)
366 # Restrict the debug information created by Clang to avoid
367 # too big object files and speed the build up a little bit
368 # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
369 CFLAGS += -flimit-debug-info
370 endif
371
372 # Allow no optimizations.
373 DEBUG_CFLAGS=-O0
374
375 # DEBUG_BINARIES uses full -g debug information for all configs
376 ifeq ($(DEBUG_BINARIES), true)
377 CFLAGS += -g
378 else
379 DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
380 ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
381 DEBUG_CFLAGS += -g
382 endif
383
384 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
385 FASTDEBUG_CFLAGS += $(FASTDEBUG_CFLAGS/$(BUILDARCH))
386 ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
387 FASTDEBUG_CFLAGS += -g
388 endif
389
390 OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
391 ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
392 OPT_CFLAGS += -g
393 endif
394 endif
395 endif
396
397 ifeq ($(USE_CLANG),)
398 # Enable bounds checking.
399 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) )" "1"
400 # stack smashing checks.
401 DEBUG_CFLAGS += -fstack-protector-all --param ssp-buffer-size=1
402 endif
403 endif
404
405
406 # If we are building HEADLESS, pass on to VM
407 # so it can set the java.awt.headless property
408 ifdef HEADLESS
409 CFLAGS += -DHEADLESS
410 endif
411
412 # We are building Embedded for a small device
413 # favor code space over speed
414 ifdef MINIMIZE_RAM_USAGE
415 CFLAGS += -DMINIMIZE_RAM_USAGE
416 endif
417
418 # Stack walking in the JVM relies on frame pointer (%rbp) to walk thread stack.
419 # Explicitly specify -fno-omit-frame-pointer because it is off by default
420 # starting with gcc 4.6.
421 ifndef USE_SUNCC
422 CFLAGS += -fno-omit-frame-pointer
423 endif
424
425 -include $(HS_ALT_MAKE)/linux/makefiles/gcc.make