1 #
2 # Copyright (c) 1999, 2018, 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 $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
63 endif
64
65
66 ifeq ($(USE_CLANG), true)
67 # Clang has precompiled headers support by default, but the user can switch
68 # it off by using 'USE_PRECOMPILED_HEADER=0'.
69 ifdef LP64
70 ifeq ($(USE_PRECOMPILED_HEADER),)
71 USE_PRECOMPILED_HEADER=1
72 endif
73 else
74 # We don't support precompiled headers on 32-bit builds because there some files are
75 # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
76 # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
77 USE_PRECOMPILED_HEADER=0
78 endif
79
80 ifeq ($(USE_PRECOMPILED_HEADER),1)
81
82 ifndef LP64
83 $(error " Precompiled Headers only supported on 64-bit platforms!")
84 endif
85
86 PRECOMPILED_HEADER_DIR=.
87 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
88 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.pch
89
90 PCH_FLAG = -include precompiled.hpp
91 PCH_FLAG/DEFAULT = $(PCH_FLAG)
92 PCH_FLAG/NO_PCH = -DNO_PCH
93 PCH_FLAG/BY_FILE = $(PCH_FLAG/$@)$(PCH_FLAG/DEFAULT$(PCH_FLAG/$@))
94
95 VM_PCH_FLAG/LIBJVM = $(PCH_FLAG/BY_FILE)
96 VM_PCH_FLAG/AOUT =
97 VM_PCH_FLAG = $(VM_PCH_FLAG/$(LINK_INTO))
98
99 # We only use precompiled headers for the JVM build
100 CFLAGS += $(VM_PCH_FLAG)
101
102 # There are some files which don't like precompiled headers
103 # The following files are build with 'OPT_CFLAGS/NOOPT' (-O0) in the opt build.
104 # But Clang doesn't support a precompiled header which was compiled with -O3
105 # to be used in a compilation unit which uses '-O0'. We could also prepare an
106 # extra '-O0' PCH file for the opt build and use it here, but it's probably
107 # not worth the effoert as long as only two files need this special handling.
108 PCH_FLAG/loopTransform.o = $(PCH_FLAG/NO_PCH)
109 PCH_FLAG/sharedRuntimeTrig.o = $(PCH_FLAG/NO_PCH)
110 PCH_FLAG/sharedRuntimeTrans.o = $(PCH_FLAG/NO_PCH)
111
112 endif
113 else # ($(USE_CLANG), true)
114 # check for precompiled headers support
115 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
116 # Allow the user to turn off precompiled headers from the command line.
117 ifneq ($(USE_PRECOMPILED_HEADER),0)
118 PRECOMPILED_HEADER_DIR=.
119 PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
120 PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
121 endif
122 endif
123 endif
124
125 # -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
126 ifeq ($(USE_PRECOMPILED_HEADER),0)
127 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
128 endif
129
130
131 #------------------------------------------------------------------------
132 # Compiler flags
133
134 # position-independent code
135 PICFLAG = -fPIC
136
137 VM_PICFLAG/LIBJVM = $(PICFLAG)
138 VM_PICFLAG/AOUT =
139 VM_PICFLAG = $(VM_PICFLAG/$(LINK_INTO))
140
141 ifeq ($(JVM_VARIANT_ZERO), true)
142 CFLAGS += $(LIBFFI_CFLAGS)
143 endif
144 ifeq ($(JVM_VARIANT_ZEROSHARK), true)
145 CFLAGS += $(LIBFFI_CFLAGS)
146 CFLAGS += $(LLVM_CFLAGS)
147 endif
148 CFLAGS += $(VM_PICFLAG)
149 CFLAGS += -fno-rtti
150 CFLAGS += -fno-exceptions
151 CFLAGS += -D_REENTRANT
152 ifeq ($(USE_CLANG),)
153 CFLAGS += -fcheck-new
154 # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
155 # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
156 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
157 CFLAGS += -fvisibility=hidden
158 endif
159 else
160 CFLAGS += -fvisibility=hidden
161 endif
162
163 ifeq ($(USE_CLANG), true)
164 # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm'
165 # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment')
166 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0"
167 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16
168 else
169 STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm -stack-alignment=16
170 endif
171 endif
172
173 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
174 ARCHFLAG/i486 = -m32 -march=i586
175 ARCHFLAG/amd64 = -m64 $(STACK_ALIGNMENT_OPT)
176 ARCHFLAG/aarch64 =
177 ARCHFLAG/ia64 =
178 ARCHFLAG/sparc = -m32 -mcpu=v9
179 ARCHFLAG/sparcv9 = -m64 -mcpu=v9
180 ARCHFLAG/zero = $(ZERO_ARCHFLAG)
181 ARCHFLAG/ppc64 = -m64
182
183 CFLAGS += $(ARCHFLAG)
184 AOUT_FLAGS += $(ARCHFLAG)
185 LFLAGS += $(ARCHFLAG)
186 ASFLAGS += $(ARCHFLAG)
187
188 ifeq ($(DEBUG_BINARIES), true)
189 ASFLAGS += $(ASFLAGS_DEBUG_SYMBOLS)
190 endif
191
192 # Use C++ Interpreter
193 ifdef CC_INTERP
194 CFLAGS += -DCC_INTERP
195 endif
196
197 # Keep temporary files (.ii, .s)
198 ifdef NEED_ASM
199 CFLAGS += -save-temps
200 else
201 CFLAGS += -pipe
202 endif
203
204 # Compiler warnings are treated as errors
205 WARNINGS_ARE_ERRORS = -Werror
206
207 ifeq ($(USE_CLANG), true)
208 # However we need to clean the code up before we can unrestrictedly enable this option with Clang
209 WARNINGS_ARE_ERRORS += -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses
210 WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-constant-out-of-range-compare -Wno-tautological-compare
211 WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess
212 WARNINGS_ARE_ERRORS += -Wno-return-type -Wno-empty-body
213 endif
214
215 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value -Wformat=2 -Wreturn-type
216
217 ifeq ($(USE_CLANG),)
218 # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
219 # conversions which might affect the values. Only enable it in earlier versions.
220 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
221 WARNING_FLAGS += -Wconversion
222 endif
223 endif
224
225 CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
226 # Special cases
227 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@))
228
229 # On newer GCCs, the compiler complains about null being passed
230 # to the %s format specifier. The warning appears only on 8u,
231 # but the code is largely the same up to trunk. We disable
232 # the warning until the code is fixed, to allow builds with
233 # -Werror (the default).
234 # See JDK-8269388 and PR3798 in IcedTea:
235 # https://icedtea.wildebeest.org/hg/icedtea8-forest/hotspot/rev/9f2ceb42dc64
236 # Option only exists on GCC 7 and later, checked by configure
237 ifeq ($(USE_FORMAT_OVERFLOW), 1)
238 CFLAGS_WARN/os_linux.o = $(CFLAGS_WARN/DEFAULT) -Wno-error=format-overflow
239 endif
240
241 # The flags to use for an Optimized g++ build
242 OPT_CFLAGS/SIZE=-Os
243 OPT_CFLAGS/SPEED=-O3
244
245 # Hotspot uses very unstrict aliasing turn this optimization off
246 # This option is added to CFLAGS rather than OPT_CFLAGS
247 # so that OPT_CFLAGS overrides get this option too.
248 CFLAGS += -fno-strict-aliasing
249
250 OPT_CFLAGS_DEFAULT ?= SPEED
251
252 ifdef OPT_CFLAGS
253 ifneq ("$(origin OPT_CFLAGS)", "command line")
254 $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.")
255 endif
256 endif
257
258 OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS)
259
260 # The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp
261 # if we use expensive-optimizations
262 ifeq ($(BUILDARCH), ia64)
263 OPT_CFLAGS += -fno-expensive-optimizations
264 endif
265
266 OPT_CFLAGS/NOOPT=-O0
267
268 # Work around some compiler bugs.
269 ifeq ($(USE_CLANG), true)
270 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
271 OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
272 endif
273 else
274 # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
275 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
276 OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
277 endif
278 endif
279
280 # Flags for generating make dependency flags.
281 DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
282 ifeq ($(USE_CLANG),)
283 ifneq ("${CC_VER_MAJOR}", "2")
284 DEPFLAGS += -fpch-deps
285 endif
286 endif
287
288 #------------------------------------------------------------------------
289 # Linker flags
290
291 # statically link libstdc++.so, work with gcc but ignored by g++
292 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
293 # While the VM needs the above line, adlc needs a separate setting:
294 ADLC_STATIC_STDCXX = -static-libstdc++
295
296 ifeq ($(USE_CLANG),)
297 # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
298 ifneq ("${CC_VER_MAJOR}", "2")
299 STATIC_LIBGCC += -static-libgcc
300 endif
301
302 ifeq ($(BUILDARCH), ia64)
303 LFLAGS += -Wl,-relax
304 endif
305 endif
306
307 # Enable linker optimization
308 LFLAGS += -Xlinker -O1
309
310 ifeq ($(USE_CLANG),)
311 # If this is a --hash-style=gnu system, use --hash-style=both
312 # The gnu .hash section won't work on some Linux systems like SuSE 10.
313 _HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
314 ifneq ($(_HAS_HASH_STYLE_GNU),)
315 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
316 endif
317 else
318 # Don't know how to find out the 'hash style' of a system as '-dumpspecs'
319 # doesn't work for Clang. So for now we'll alwys use --hash-style=both
320 LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
321 endif
322
323 LFLAGS += $(LDFLAGS_HASH_STYLE)
324
325 LDFLAGS_NO_EXEC_STACK="-Wl,-z,noexecstack"
326
327 # Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
328 MAPFLAG = -Xlinker --version-script=FILENAME
329
330 # Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj
331 SONAMEFLAG = -Xlinker -soname=SONAME
332
333 # Build shared library
334 SHARED_FLAG = -shared
335
336 # Keep symbols even they are not used
337 AOUT_FLAGS += -Xlinker -export-dynamic
338
339 #------------------------------------------------------------------------
340 # Debug flags
341
342 ifeq ($(USE_CLANG), true)
343 # Restrict the debug information created by Clang to avoid
344 # too big object files and speed the build up a little bit
345 # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
346 CFLAGS += -flimit-debug-info
347 endif
348
349 # DEBUG_BINARIES uses full -g debug information for all configs
350 ifeq ($(DEBUG_BINARIES), true)
351 CFLAGS += -g
352 else
353 DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
354 ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
355 DEBUG_CFLAGS += -g
356 endif
357
358 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
359 FASTDEBUG_CFLAGS += $(FASTDEBUG_CFLAGS/$(BUILDARCH))
360 ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
361 FASTDEBUG_CFLAGS/$(BUILDARCH) = -g
362 endif
363
364 OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
365 ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
366 OPT_CFLAGS/$(BUILDARCH) = -g
367 endif
368 endif
369 endif
370
371 # If we are building HEADLESS, pass on to VM
372 # so it can set the java.awt.headless property
373 ifdef HEADLESS
374 CFLAGS += -DHEADLESS
375 endif
376
377 # We are building Embedded for a small device
378 # favor code space over speed
379 ifdef MINIMIZE_RAM_USAGE
380 CFLAGS += -DMINIMIZE_RAM_USAGE
381 endif
382
383 # Stack walking in the JVM relies on frame pointer (%rbp) to walk thread stack.
384 # Explicitly specify -fno-omit-frame-pointer because it is off by default
385 # starting with gcc 4.6.
386 ifndef USE_SUNCC
387 CFLAGS += -fno-omit-frame-pointer
388 endif
389
390 -include $(HS_ALT_MAKE)/linux/makefiles/gcc.make