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. 29ifeq ($(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 = $(CC) -c 52endif 53 54 55ifeq ($(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) 58else 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 $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2) 63endif 64 65 66ifeq ($(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 = $(PCH_FLAG/NO_PCH) 111 112 endif 113else # ($(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=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch 121 endif 122 endif 123endif 124 125# -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp. 126ifeq ($(USE_PRECOMPILED_HEADER),0) 127 CFLAGS += -DDONT_USE_PRECOMPILED_HEADER 128endif 129 130 131#------------------------------------------------------------------------ 132# Compiler flags 133 134# position-independent code 135PICFLAG = -fPIC 136 137VM_PICFLAG/LIBJVM = $(PICFLAG) 138VM_PICFLAG/AOUT = 139VM_PICFLAG = $(VM_PICFLAG/$(LINK_INTO)) 140 141ifeq ($(JVM_VARIANT_ZERO), true) 142CFLAGS += $(LIBFFI_CFLAGS) 143endif 144ifeq ($(JVM_VARIANT_ZEROSHARK), true) 145CFLAGS += $(LIBFFI_CFLAGS) 146CFLAGS += $(LLVM_CFLAGS) 147endif 148CFLAGS += $(VM_PICFLAG) 149CFLAGS += -fno-rtti 150CFLAGS += -fno-exceptions 151CFLAGS += -D_REENTRANT 152ifeq ($(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 159else 160 CFLAGS += -fvisibility=hidden 161endif 162 163ifeq ($(USE_CLANG), true) 164 # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm' 165 # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment') 166 ifneq "$(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 171endif 172 173ARCHFLAG = $(ARCHFLAG/$(BUILDARCH)) 174ARCHFLAG/i486 = -m32 -march=i586 175ARCHFLAG/amd64 = -m64 $(STACK_ALIGNMENT_OPT) 176ARCHFLAG/aarch64 = 177ARCHFLAG/ia64 = 178ARCHFLAG/sparc = -m32 -mcpu=v9 179ARCHFLAG/sparcv9 = -m64 -mcpu=v9 180ARCHFLAG/zero = $(ZERO_ARCHFLAG) 181ARCHFLAG/ppc64 = -m64 182 183CFLAGS += $(ARCHFLAG) 184AOUT_FLAGS += $(ARCHFLAG) 185LFLAGS += $(ARCHFLAG) 186ASFLAGS += $(ARCHFLAG) 187 188ifeq ($(DEBUG_BINARIES), true) 189 ASFLAGS += $(ASFLAGS_DEBUG_SYMBOLS) 190endif 191 192# Use C++ Interpreter 193ifdef CC_INTERP 194 CFLAGS += -DCC_INTERP 195endif 196 197# Keep temporary files (.ii, .s) 198ifdef NEED_ASM 199 CFLAGS += -save-temps 200else 201 CFLAGS += -pipe 202endif 203 204# Compiler warnings are treated as errors 205WARNINGS_ARE_ERRORS = -Werror 206 207ifeq ($(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 213endif 214 215WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value -Wformat=2 -Wreturn-type 216 217ifeq ($(USE_CLANG),) 218 # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit 219 # conversions which might affect the values. Only enable it in earlier versions. 220 ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0" 221 WARNING_FLAGS += -Wconversion 222 endif 223endif 224 225CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS) 226# Special cases 227CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 228 229# On newer GCCs, the compiler complains about null being passed 230# to the %s format specifier. The warning appears only on 8u, 231# but the code is largely the same up to trunk. We disable 232# the warning until the code is fixed, to allow builds with 233# -Werror (the default). 234# See JDK-8269388 and PR3798 in IcedTea: 235# https://icedtea.wildebeest.org/hg/icedtea8-forest/hotspot/rev/9f2ceb42dc64 236# Option only exists on GCC 7 and later, checked by configure 237ifeq ($(USE_FORMAT_OVERFLOW), 1) 238 CFLAGS_WARN/os_linux.o = $(CFLAGS_WARN/DEFAULT) -Wno-error=format-overflow 239endif 240 241# The flags to use for an Optimized g++ build 242OPT_CFLAGS/SIZE=-Os 243OPT_CFLAGS/SPEED=-O3 244 245# Hotspot uses very unstrict aliasing turn this optimization off 246# This option is added to CFLAGS rather than OPT_CFLAGS 247# so that OPT_CFLAGS overrides get this option too. 248CFLAGS += -fno-strict-aliasing 249 250OPT_CFLAGS_DEFAULT ?= SPEED 251 252ifdef OPT_CFLAGS 253 ifneq ("$(origin OPT_CFLAGS)", "command line") 254 $(error " Use OPT_EXTRAS instead of OPT_CFLAGS to add extra flags to OPT_CFLAGS.") 255 endif 256endif 257 258OPT_CFLAGS = $(OPT_CFLAGS/$(OPT_CFLAGS_DEFAULT)) $(OPT_EXTRAS) 259 260# The gcc compiler segv's on ia64 when compiling bytecodeInterpreter.cpp 261# if we use expensive-optimizations 262ifeq ($(BUILDARCH), ia64) 263OPT_CFLAGS += -fno-expensive-optimizations 264endif 265 266OPT_CFLAGS/NOOPT=-O0 267 268# Work around some compiler bugs. 269ifeq ($(USE_CLANG), true) 270 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1) 271 OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT) 272 endif 273else 274 # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation. 275 ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1) 276 OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT) 277 endif 278endif 279 280# Flags for generating make dependency flags. 281DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d) 282ifeq ($(USE_CLANG),) 283 ifneq ("${CC_VER_MAJOR}", "2") 284 DEPFLAGS += -fpch-deps 285 endif 286endif 287 288#------------------------------------------------------------------------ 289# Linker flags 290 291# statically link libstdc++.so, work with gcc but ignored by g++ 292STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic 293# While the VM needs the above line, adlc needs a separate setting: 294ADLC_STATIC_STDCXX = -static-libstdc++ 295 296ifeq ($(USE_CLANG),) 297 # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x. 298 ifneq ("${CC_VER_MAJOR}", "2") 299 STATIC_LIBGCC += -static-libgcc 300 endif 301 302 ifeq ($(BUILDARCH), ia64) 303 LFLAGS += -Wl,-relax 304 endif 305endif 306 307# Enable linker optimization 308LFLAGS += -Xlinker -O1 309 310ifeq ($(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 317else 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 321endif 322 323LFLAGS += $(LDFLAGS_HASH_STYLE) 324 325LDFLAGS_NO_EXEC_STACK="-Wl,-z,noexecstack" 326 327# Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file. 328MAPFLAG = -Xlinker --version-script=FILENAME 329 330# Use $(SONAMEFLAG:SONAME=soname) to specify the intrinsic name of a shared obj 331SONAMEFLAG = -Xlinker -soname=SONAME 332 333# Build shared library 334SHARED_FLAG = -shared 335 336# Keep symbols even they are not used 337AOUT_FLAGS += -Xlinker -export-dynamic 338 339#------------------------------------------------------------------------ 340# Debug flags 341 342ifeq ($(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 347endif 348 349# DEBUG_BINARIES uses full -g debug information for all configs 350ifeq ($(DEBUG_BINARIES), true) 351 CFLAGS += -g 352else 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 369endif 370 371# If we are building HEADLESS, pass on to VM 372# so it can set the java.awt.headless property 373ifdef HEADLESS 374CFLAGS += -DHEADLESS 375endif 376 377# We are building Embedded for a small device 378# favor code space over speed 379ifdef MINIMIZE_RAM_USAGE 380CFLAGS += -DMINIMIZE_RAM_USAGE 381endif 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. 386ifndef USE_SUNCC 387 CFLAGS += -fno-omit-frame-pointer 388endif 389 390-include $(HS_ALT_MAKE)/linux/makefiles/gcc.make 391