--- a/hotspot/make/linux/makefiles/gcc.make Tue Jun 04 12:06:54 2013 -0700
+++ b/hotspot/make/linux/makefiles/gcc.make Tue Jun 04 22:16:15 2013 -0700
@@ -36,8 +36,14 @@
HOSTCC = gcc
STRIP = $(ALT_COMPILER_PATH)/strip
else
- CXX = g++
- CC = gcc
+ ifeq ($(USE_CLANG), true)
+ CXX = clang++
+ CC = clang
+ else
+ CXX = g++
+ CC = gcc
+ endif
+
HOSTCXX = $(CXX)
HOSTCC = $(CC)
STRIP = strip
@@ -46,19 +52,79 @@
endif
-# -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
-# prints the numbers (e.g. "2.95", "3.2.1")
-CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
-CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
+ifeq ($(USE_CLANG), true)
+ CC_VER_MAJOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f1)
+ CC_VER_MINOR := $(shell $(CC) -v 2>&1 | grep version | sed "s/.*version \([0-9]*\.[0-9]*\).*/\1/" | cut -d'.' -f2)
+else
+ # -dumpversion in gcc-2.91 shows "egcs-2.91.66". In later version, it only
+ # prints the numbers (e.g. "2.95", "3.2.1")
+ CC_VER_MAJOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f1)
+ CC_VER_MINOR := $(shell $(CC) -dumpversion | sed 's/egcs-//' | cut -d'.' -f2)
+endif
+
+
+ifeq ($(USE_CLANG), true)
+ # Clang has precompiled headers support by default, but the user can switch
+ # it off by using 'USE_PRECOMPILED_HEADER=0'.
+ ifdef LP64
+ ifeq ($(USE_PRECOMPILED_HEADER),)
+ USE_PRECOMPILED_HEADER=1
+ endif
+ else
+ # We don't support precompiled headers on 32-bit builds because there some files are
+ # compiled with -fPIC while others are compiled without (see 'NONPIC_OBJ_FILES' rules.make)
+ # Clang produces an error if the PCH file was compiled with other options than the actual compilation unit.
+ USE_PRECOMPILED_HEADER=0
+ endif
+
+ ifeq ($(USE_PRECOMPILED_HEADER),1)
+
+ ifndef LP64
+ $(error " Precompiled Headers only supported on 64-bit platforms!")
+ endif
+
+ PRECOMPILED_HEADER_DIR=.
+ PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
+ PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.pch
-# check for precompiled headers support
-ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
-# Allow the user to turn off precompiled headers from the command line.
-ifneq ($(USE_PRECOMPILED_HEADER),0)
-PRECOMPILED_HEADER_DIR=.
-PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
-PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
+ PCH_FLAG = -include precompiled.hpp
+ PCH_FLAG/DEFAULT = $(PCH_FLAG)
+ PCH_FLAG/NO_PCH = -DNO_PCH
+ PCH_FLAG/BY_FILE = $(PCH_FLAG/$@)$(PCH_FLAG/DEFAULT$(PCH_FLAG/$@))
+
+ VM_PCH_FLAG/LIBJVM = $(PCH_FLAG/BY_FILE)
+ VM_PCH_FLAG/AOUT =
+ VM_PCH_FLAG = $(VM_PCH_FLAG/$(LINK_INTO))
+
+ # We only use precompiled headers for the JVM build
+ CFLAGS += $(VM_PCH_FLAG)
+
+ # There are some files which don't like precompiled headers
+ # The following files are build with 'OPT_CFLAGS/NOOPT' (-O0) in the opt build.
+ # But Clang doesn't support a precompiled header which was compiled with -O3
+ # to be used in a compilation unit which uses '-O0'. We could also prepare an
+ # extra '-O0' PCH file for the opt build and use it here, but it's probably
+ # not worth the effoert as long as only two files need this special handling.
+ PCH_FLAG/loopTransform.o = $(PCH_FLAG/NO_PCH)
+ PCH_FLAG/sharedRuntimeTrig.o = $(PCH_FLAG/NO_PCH)
+ PCH_FLAG/sharedRuntimeTrans.o = $(PCH_FLAG/NO_PCH)
+
+ endif
+else # ($(USE_CLANG), true)
+ # check for precompiled headers support
+ ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 4 \) \))" "0"
+ # Allow the user to turn off precompiled headers from the command line.
+ ifneq ($(USE_PRECOMPILED_HEADER),0)
+ PRECOMPILED_HEADER_DIR=.
+ PRECOMPILED_HEADER_SRC=$(GAMMADIR)/src/share/vm/precompiled/precompiled.hpp
+ PRECOMPILED_HEADER=$(PRECOMPILED_HEADER_DIR)/precompiled.hpp.gch
+ endif
+ endif
endif
+
+# -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
+ifeq ($(USE_PRECOMPILED_HEADER),0)
+ CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
endif
@@ -83,16 +149,30 @@
CFLAGS += -fno-rtti
CFLAGS += -fno-exceptions
CFLAGS += -D_REENTRANT
-CFLAGS += -fcheck-new
-# version 4 and above support fvisibility=hidden (matches jni_x86.h file)
-# except 4.1.2 gives pointless warnings that can't be disabled (afaik)
-ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
-CFLAGS += -fvisibility=hidden
+ifeq ($(USE_CLANG),)
+ CFLAGS += -fcheck-new
+ # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
+ # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
+ ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
+ CFLAGS += -fvisibility=hidden
+ endif
+else
+ CFLAGS += -fvisibility=hidden
+endif
+
+ifeq ($(USE_CLANG), true)
+ # Before Clang 3.1, we had to pass the stack alignment specification directly to llvm with the help of '-mllvm'
+ # Starting with version 3.1, Clang understands the '-mstack-alignment' (and rejects '-mllvm -stack-alignment')
+ ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3 \) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0"
+ STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16
+ else
+ STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm -stack-alignment=16
+ endif
endif
ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
ARCHFLAG/i486 = -m32 -march=i586
-ARCHFLAG/amd64 = -m64
+ARCHFLAG/amd64 = -m64 $(STACK_ALIGNMENT_OPT)
ARCHFLAG/ia64 =
ARCHFLAG/sparc = -m32 -mcpu=v9
ARCHFLAG/sparcv9 = -m64 -mcpu=v9
@@ -126,12 +206,22 @@
# Compiler warnings are treated as errors
WARNINGS_ARE_ERRORS = -Werror
+ifeq ($(USE_CLANG), true)
+ # However we need to clean the code up before we can unrestrictedly enable this option with Clang
+ WARNINGS_ARE_ERRORS += -Wno-unused-value -Wno-logical-op-parentheses -Wno-parentheses-equality -Wno-parentheses
+ WARNINGS_ARE_ERRORS += -Wno-switch -Wno-tautological-constant-out-of-range-compare -Wno-tautological-compare
+ WARNINGS_ARE_ERRORS += -Wno-delete-non-virtual-dtor -Wno-deprecated -Wno-format -Wno-dynamic-class-memaccess
+ WARNINGS_ARE_ERRORS += -Wno-return-type -Wno-empty-body
+endif
+
WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function
-# Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
-# conversions which might affect the values. Only enable it in earlier versions.
-ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
-WARNING_FLAGS += -Wconversion
+ifeq ($(USE_CLANG),)
+ # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
+ # conversions which might affect the values. Only enable it in earlier versions.
+ ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
+ WARNING_FLAGS += -Wconversion
+ endif
endif
CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
@@ -165,19 +255,24 @@
OPT_CFLAGS/NOOPT=-O0
-# 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
-ifneq "$(shell expr \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) = 3 \) \))" "0"
-OPT_CFLAGS/mulnode.o += -O0
+# Work around some compiler bugs.
+ifeq ($(USE_CLANG), true)
+ ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 2), 1)
+ OPT_CFLAGS/loopTransform.o += $(OPT_CFLAGS/NOOPT)
+ endif
+else
+ # 6835796. Problem in GCC 4.3.0 with mulnode.o optimized compilation.
+ ifeq ($(shell expr $(CC_VER_MAJOR) = 4 \& $(CC_VER_MINOR) = 3), 1)
+ OPT_CFLAGS/mulnode.o += $(OPT_CFLAGS/NOOPT)
+ endif
endif
# Flags for generating make dependency flags.
-ifneq ("${CC_VER_MAJOR}", "2")
-DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
-endif
-
-# -DDONT_USE_PRECOMPILED_HEADER will exclude all includes in precompiled.hpp.
-ifeq ($(USE_PRECOMPILED_HEADER),0)
-CFLAGS += -DDONT_USE_PRECOMPILED_HEADER
+DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)
+ifeq ($(USE_CLANG),)
+ ifneq ("${CC_VER_MAJOR}", "2")
+ DEPFLAGS += -fpch-deps
+ endif
endif
#------------------------------------------------------------------------
@@ -186,24 +281,33 @@
# statically link libstdc++.so, work with gcc but ignored by g++
STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
-# statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
-ifneq ("${CC_VER_MAJOR}", "2")
-STATIC_LIBGCC += -static-libgcc
-endif
+ifeq ($(USE_CLANG),)
+ # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
+ ifneq ("${CC_VER_MAJOR}", "2")
+ STATIC_LIBGCC += -static-libgcc
+ endif
-ifeq ($(BUILDARCH), ia64)
-LFLAGS += -Wl,-relax
+ ifeq ($(BUILDARCH), ia64)
+ LFLAGS += -Wl,-relax
+ endif
endif
# Enable linker optimization
LFLAGS += -Xlinker -O1
-# If this is a --hash-style=gnu system, use --hash-style=both
-# The gnu .hash section won't work on some Linux systems like SuSE 10.
-_HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
-ifneq ($(_HAS_HASH_STYLE_GNU),)
+ifeq ($(USE_CLANG),)
+ # If this is a --hash-style=gnu system, use --hash-style=both
+ # The gnu .hash section won't work on some Linux systems like SuSE 10.
+ _HAS_HASH_STYLE_GNU:=$(shell $(CC) -dumpspecs | grep -- '--hash-style=gnu')
+ ifneq ($(_HAS_HASH_STYLE_GNU),)
+ LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
+ endif
+else
+ # Don't know how to find out the 'hash style' of a system as '-dumpspecs'
+ # doesn't work for Clang. So for now we'll alwys use --hash-style=both
LDFLAGS_HASH_STYLE = -Wl,--hash-style=both
endif
+
LFLAGS += $(LDFLAGS_HASH_STYLE)
# Use $(MAPFLAG:FILENAME=real_file_name) to specify a map file.
@@ -221,6 +325,13 @@
#------------------------------------------------------------------------
# Debug flags
+ifeq ($(USE_CLANG), true)
+ # Restrict the debug information created by Clang to avoid
+ # too big object files and speed the build up a little bit
+ # (see http://llvm.org/bugs/show_bug.cgi?id=7554)
+ CFLAGS += -flimit-debug-info
+endif
+
# DEBUG_BINARIES uses full -g debug information for all configs
ifeq ($(DEBUG_BINARIES), true)
CFLAGS += -g
@@ -237,7 +348,12 @@
DEBUG_CFLAGS/ppc = -g
DEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
ifeq ($(DEBUG_CFLAGS/$(BUILDARCH)),)
- DEBUG_CFLAGS += -gstabs
+ ifeq ($(USE_CLANG), true)
+ # Clang doesn't understand -gstabs
+ OPT_CFLAGS += -g
+ else
+ OPT_CFLAGS += -gstabs
+ endif
endif
ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
@@ -247,7 +363,12 @@
FASTDEBUG_CFLAGS/ppc = -g
FASTDEBUG_CFLAGS += $(DEBUG_CFLAGS/$(BUILDARCH))
ifeq ($(FASTDEBUG_CFLAGS/$(BUILDARCH)),)
- FASTDEBUG_CFLAGS += -gstabs
+ ifeq ($(USE_CLANG), true)
+ # Clang doesn't understand -gstabs
+ OPT_CFLAGS += -g
+ else
+ OPT_CFLAGS += -gstabs
+ endif
endif
OPT_CFLAGS/ia64 = -g
@@ -256,7 +377,12 @@
OPT_CFLAGS/ppc = -g
OPT_CFLAGS += $(OPT_CFLAGS/$(BUILDARCH))
ifeq ($(OPT_CFLAGS/$(BUILDARCH)),)
- OPT_CFLAGS += -gstabs
+ ifeq ($(USE_CLANG), true)
+ # Clang doesn't understand -gstabs
+ OPT_CFLAGS += -g
+ else
+ OPT_CFLAGS += -gstabs
+ endif
endif
endif
endif