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 $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
63 endif
64
65 ifeq ($(USE_CLANG), true)
66 # Clang has precompiled headers support by default, but the user can switch
67 # it off by using 'USE_PRECOMPILED_HEADER=0'.
68 ifdef LP64
69 ifeq ($(USE_PRECOMPILED_HEADER),)
70 USE_PRECOMPILED_HEADER=1
71 endif
72 else
73 # We don't support precompiled headers on 32-bit builds because there some files are
74 # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
75 # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
76 USE_PRECOMPILED_HEADER=0
77 endif
78
79 ifeq ($(USE_PRECOMPILED_HEADER),1)
80
81 ifndef LP64
82 $(error " Precompiled Headers only supported on 64-bit platforms!")
83 endif
84
85 PRECOMPILED_HEADER_DIR=.
86 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
87 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.pch
88
89 PCH_FLAG = -include precompiled.hpp
90 PCH_FLAG/DEFAULT = $(PCH_FLAG)
91 PCH_FLAG/NO_PCH = -DNO_PCH
92 PCH_FLAG/BY_FILE = $(PCH_FLAG/$@)$(PCH_FLAG/DEFAULT$(PCH_FLAG/$@))
93
94 VM_PCH_FLAG/LIBJVM = $(PCH_FLAG/BY_FILE)
95 VM_PCH_FLAG/AOUT =
96 VM_PCH_FLAG = $(VM_PCH_FLAG/$(LINK_INTO))
97
98 # We only use precompiled headers for the JVM build
99 CFLAGS += $(VM_PCH_FLAG)
100
101 # There are some files which don't like precompiled headers
102 # The following files are build with 'OPT_CFLAGS/NOOPT' (-O0) in the opt build.
103 # But Clang doesn't support a precompiled header which was compiled with -O3
104 # to be used in a compilation unit which uses '-O0'. We could also prepare an
105 # extra '-O0' PCH file for the opt build and use it here, but it's probably
106 # not worth the effort as long as only two files need this special handling.
107 PCH_FLAG/loopTransform.o = $(PCH_FLAG/NO_PCH)
108 PCH_FLAG/sharedRuntimeTrig.o = $(PCH_FLAG/NO_PCH)
109 PCH_FLAG/sharedRuntimeTrans.o = $(PCH_FLAG/NO_PCH)
110
111 endif
112 else # ($(USE_CLANG), true)
113 # check for precompiled headers support
114 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
115 # Allow the user to turn off precompiled headers from the command line.
116 ifneq ($(USE_PRECOMPILED_HEADER),0)
117 PRECOMPILED_HEADER_DIR=.
118 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
119 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
120 endif
121 endif
122 endif
123
124 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
125 ifeq ($(USE_PRECOMPILED_HEADER),0)
126 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
127 endif
128
129
130 #------------------------------------------------------------------------
131 # Compiler flags
132
133 # position-independent code
134 PICFLAG = -fPIC
135
136 VM_PICFLAG/LIBJVM = $(PICFLAG)
137 VM_PICFLAG/AOUT =
138 VM_PICFLAG = $(VM_PICFLAG/$(LINK_INTO))
139
140 ifeq ($(JVM_VARIANT_ZERO), true)
141 CFLAGS += $(LIBFFI_CFLAGS)
142 endif
143 ifeq ($(JVM_VARIANT_ZEROSHARK), true)
144 CFLAGS += $(LIBFFI_CFLAGS)
145 CFLAGS += $(LLVM_CFLAGS)
146 endif
147 CFLAGS += $(VM_PICFLAG)
148 CFLAGS += -fno-rtti
149 CFLAGS += -fno-exceptions
150 CFLAGS += -D_REENTRANT
151 ifeq ($(USE_CLANG),)
152 CFLAGS += -fcheck-new
153 # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
154 # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
155 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
156 CFLAGS += -fvisibility=hidden
157 endif
158 else
159 CFLAGS += -fvisibility=hidden
160 endif
161
162 ifeq ($(USE_CLANG), true)
163 # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm'
164 # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment')
165 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0"
166 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16
167 else
168 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm -stack-alignment=16
169 endif
170 endif
171
172 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
173 ARCHFLAG/i486 = -m32 -march=i586
174 ARCHFLAG/amd64 = -m64 $(STACK_ALIGNMENT_OPT)
175 ARCHFLAG/aarch64 =
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 -Wformat=2 -Wreturn-type -Woverloaded-virtual
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 # GCC < 4.3
217 WARNING_FLAGS += -Wconversion
218 endif
219 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 8 \) \))" "1"
220 # GCC >= 4.8
221 # This flag is only known since GCC 4.3. Gcc 4.8 contains a fix so that with templates no
222 # warnings are issued: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11856
223 WARNING_FLAGS += -Wtype-limits
224 # GCC < 4.8 don't accept this flag for C++.
225 WARNING_FLAGS += -Wno-format-zero-length
226 # GCC 4.8 reports less false positives than the older compilers.
227 WARNING_FLAGS += -Wuninitialized
228 endif
229 endif
230
231 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
232
233 # Special cases
234 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@))
235
236 # optimization control flags (Used by fastdebug and release variants)
237 OPT_CFLAGS/NOOPT=-O0
238 OPT_CFLAGS/DEBUG=-O0
239 OPT_CFLAGS/SIZE=-Os
240 OPT_CFLAGS/SPEED=-O3
241
242 OPT_CFLAGS_DEFAULT ?= SPEED
243
244 # Hotspot uses very unstrict aliasing turn this optimization off
245 # This option is added to CFLAGS rather than OPT_CFLAGS
246 # so that OPT_CFLAGS overrides get this option too.
247 CFLAGS += -fno-strict-aliasing
248
249 ifdef OPT_CFLAGS
250 ifneq ("$(origin OPT_CFLAGS)", "command line")
251 $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
252 endif
253 endif
254
255 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
256
257 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp
258 # if we use expensive-optimizations
259 ifeq ($(BUILDARCH), ia64)
260 OPT_CFLAGS += -fno-expensive-optimizations
261 endif
262
263 # Work around some compiler bugs.
264 ifeq ($(USE_CLANG), true)
265 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
266 OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
267 endif
268 else
269 # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
270 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
271 OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
272 endif
273 endif
274
275 # Flags for generating make dependency flags.
276 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
277 ifeq ($(USE_CLANG),)
278 ifneq ($(CC_VER_MAJOR), 2)
279 DEPFLAGS += -fpch-deps
280 endif
281 endif
282
283 #------------------------------------------------------------------------
284 # Linker flags
285
286 # statically link libstdc++.so, work with gcc but ignored by g++
287 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
288
289 # Enable linker optimization
290 LFLAGS += -Xlinker -O1
291
292 ifeq ($(USE_CLANG),)
293 STATIC_LIBGCC += -static-libgcc
294
295 ifneq (, findstring(debug,$(BUILD_FLAVOR)))
296 # for relocations read-only
297 LFLAGS += -Xlinker -z -Xlinker relro
298
299 ifeq ($(BUILD_FLAVOR), debug)
300 # disable incremental relocations linking
301 LFLAGS += -Xlinker -z -Xlinker now
302 endif
303 endif
304
305 ifeq ($(BUILDARCH), ia64)
306 LFLAGS += -Wl,-relax
307 endif
308
309 # If this is a --hash-style=gnu system, use --hash-style=both
310 # The gnu .hash section won't work on some Linux systems like SuSE 10.
311 _HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
312 ifneq ($(_HAS_HASH_STYLE_GNU),)
313 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
314 endif
315 else
316 # Don't know how to find out the 'hash style' of a system as '-dumpspecs'
317 # doesn't work for Clang. So for now we'll alwys use --hash-style=both
318 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
319 endif
320
321 LFLAGS += $(LDFLAGS_HASH_STYLE)
322
323 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
324 MAPFLAG = -Xlinker --version-script=FILENAME
325
326 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
327 SONAMEFLAG = -Xlinker -soname=SONAME
328
329 # Build shared library
330 SHARED_FLAG = -shared
331
332 # Keep symbols even they are not used
333 AOUT_FLAGS += -Xlinker -export-dynamic
334
335 #------------------------------------------------------------------------
336 # Debug flags
337
338 ifeq ($(USE_CLANG), true)
339 # Restrict the debug information created by Clang to avoid
340 # too big object files and speed the build up a little bit
341 # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
342 CFLAGS += -flimit-debug-info
343 endif
344
345 # Allow no optimizations.
346 DEBUG_CFLAGS=-O0
347
348 # DEBUG_BINARIES uses full -g debug information for all configs
349 ifeq ($(DEBUG_BINARIES), true)
350 CFLAGS += -g
351 else
352 DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
353 ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
354 DEBUG_CFLAGS += -g
355 endif
356
357 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
358 FASTDEBUG_CFLAGS += $(FASTDEBUG_CFLAGS/$(BUILDARCH))
359 ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
360 FASTDEBUG_CFLAGS += -g
361 endif
362
363 OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
364 ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
365 OPT_CFLAGS += -g
366 endif
367 endif
368 endif
369
370 ifeq ($(USE_CLANG),)
371 # Enable bounds checking.
372 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) )" "1"
373 # stack smashing checks.
374 DEBUG_CFLAGS += -fstack-protector-all --param ssp-buffer-size=1
375 endif
376 endif
377
378
379 # If we are building HEADLESS, pass on to VM
380 # so it can set the java.awt.headless property
381 ifdef HEADLESS
382 CFLAGS += -DHEADLESS
383 endif
384
385 # We are building Embedded for a small device
386 # favor code space over speed
387 ifdef MINIMIZE_RAM_USAGE
388 CFLAGS += -DMINIMIZE_RAM_USAGE
389 endif
390
391 # Stack walking in the JVM relies on frame pointer (%rbp) to walk thread stack.
392 # Explicitly specify -fno-omit-frame-pointer because it is off by default
393 # starting with gcc 4.6.
394 ifndef USE_SUNCC
395 CFLAGS += -fno-omit-frame-pointer
396 endif
397
398 -include $(HS_ALT_MAKE)/linux/makefiles/gcc.make