config.mk revision 057aaea54a8dd6aa769290b1c0f471a17aaf1a22 
1## Clang configurations.
2
3# WITHOUT_CLANG covers both HOST and TARGET
4ifeq ($(WITHOUT_CLANG),true)
5WITHOUT_TARGET_CLANG := true
6WITHOUT_HOST_CLANG := true
7endif
8
9LLVM_PREBUILTS_VERSION := 3.6
10LLVM_PREBUILTS_PATH := prebuilts/clang/$(BUILD_OS)-x86/host/$(LLVM_PREBUILTS_VERSION)/bin
11LLVM_RTLIB_PATH := $(LLVM_PREBUILTS_PATH)/../lib/clang/$(LLVM_PREBUILTS_VERSION)/lib/linux/
12
13CLANG := $(LLVM_PREBUILTS_PATH)/clang$(BUILD_EXECUTABLE_SUFFIX)
14CLANG_CXX := $(LLVM_PREBUILTS_PATH)/clang++$(BUILD_EXECUTABLE_SUFFIX)
15LLVM_AS := $(LLVM_PREBUILTS_PATH)/llvm-as$(BUILD_EXECUTABLE_SUFFIX)
16LLVM_LINK := $(LLVM_PREBUILTS_PATH)/llvm-link$(BUILD_EXECUTABLE_SUFFIX)
17
18CLANG_TBLGEN := $(BUILD_OUT_EXECUTABLES)/clang-tblgen$(BUILD_EXECUTABLE_SUFFIX)
19LLVM_TBLGEN := $(BUILD_OUT_EXECUTABLES)/llvm-tblgen$(BUILD_EXECUTABLE_SUFFIX)
20
21# Clang flags for all host or target rules
22CLANG_CONFIG_EXTRA_ASFLAGS :=
23CLANG_CONFIG_EXTRA_CFLAGS :=
24CLANG_CONFIG_EXTRA_CONLYFLAGS := -std=gnu99
25CLANG_CONFIG_EXTRA_CPPFLAGS :=
26CLANG_CONFIG_EXTRA_LDFLAGS :=
27
28CLANG_CONFIG_EXTRA_CFLAGS += \
29  -D__compiler_offsetof=__builtin_offsetof
30
31# Help catch common 32/64-bit errors.
32CLANG_CONFIG_EXTRA_CFLAGS += \
33  -Werror=int-conversion
34
35# Disable overly aggressive warning for macros defined with a leading underscore
36# This used to happen in AndroidConfig.h, which was included everywhere.
37# TODO: can we remove this now?
38CLANG_CONFIG_EXTRA_CFLAGS += \
39  -Wno-reserved-id-macro
40
41# Disable overly aggressive warning for format strings.
42# Bug: 20148343
43CLANG_CONFIG_EXTRA_CFLAGS += \
44  -Wno-format-pedantic
45
46# Workaround for ccache with clang.
47# See http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html.
48CLANG_CONFIG_EXTRA_CFLAGS += \
49  -Wno-unused-command-line-argument
50
51# Disable -Winconsistent-missing-override until we can clean up the existing
52# codebase for it.
53CLANG_CONFIG_EXTRA_CPPFLAGS += \
54  -Wno-inconsistent-missing-override
55
56CLANG_CONFIG_UNKNOWN_CFLAGS := \
57  -finline-functions \
58  -finline-limit=64 \
59  -fno-canonical-system-headers \
60  -Wno-clobbered \
61  -fno-devirtualize \
62  -fno-tree-sra \
63  -fprefetch-loop-arrays \
64  -funswitch-loops \
65  -Wmaybe-uninitialized \
66  -Wno-error=clobbered \
67  -Wno-error=maybe-uninitialized \
68  -Wno-error=unused-but-set-parameter \
69  -Wno-error=unused-but-set-variable \
70  -Wno-free-nonheap-object \
71  -Wno-literal-suffix \
72  -Wno-maybe-uninitialized \
73  -Wno-old-style-declaration \
74  -Wno-psabi \
75  -Wno-unused-but-set-parameter \
76  -Wno-unused-but-set-variable \
77  -Wno-unused-local-typedefs \
78  -Wunused-but-set-parameter \
79  -Wunused-but-set-variable
80
81# Clang flags for all host rules
82CLANG_CONFIG_HOST_EXTRA_ASFLAGS :=
83CLANG_CONFIG_HOST_EXTRA_CFLAGS :=
84CLANG_CONFIG_HOST_EXTRA_CPPFLAGS :=
85CLANG_CONFIG_HOST_EXTRA_LDFLAGS :=
86
87# Clang flags for all host cross rules
88CLANG_CONFIG_HOST_CROSS_EXTRA_ASFLAGS :=
89CLANG_CONFIG_HOST_CROSS_EXTRA_CFLAGS :=
90CLANG_CONFIG_HOST_CROSS_EXTRA_CPPFLAGS :=
91CLANG_CONFIG_HOST_CROSS_EXTRA_LDFLAGS :=
92
93# Clang flags for all target rules
94CLANG_CONFIG_TARGET_EXTRA_ASFLAGS :=
95CLANG_CONFIG_TARGET_EXTRA_CFLAGS := -nostdlibinc
96CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS := -nostdlibinc
97CLANG_CONFIG_TARGET_EXTRA_LDFLAGS :=
98
99CLANG_DEFAULT_UB_CHECKS := \
100  bool \
101  integer-divide-by-zero \
102  return \
103  returns-nonnull-attribute \
104  shift-exponent \
105  unreachable \
106  vla-bound \
107
108# TODO(danalbert): The following checks currently have compiler performance
109# issues.
110# CLANG_DEFAULT_UB_CHECKS += alignment
111# CLANG_DEFAULT_UB_CHECKS += bounds
112# CLANG_DEFAULT_UB_CHECKS += enum
113# CLANG_DEFAULT_UB_CHECKS += float-cast-overflow
114# CLANG_DEFAULT_UB_CHECKS += float-divide-by-zero
115# CLANG_DEFAULT_UB_CHECKS += nonnull-attribute
116# CLANG_DEFAULT_UB_CHECKS += null
117# CLANG_DEFAULT_UB_CHECKS += shift-base
118# CLANG_DEFAULT_UB_CHECKS += signed-integer-overflow
119
120# TODO(danalbert): Fix UB in libc++'s __tree so we can turn this on.
121# https://llvm.org/PR19302
122# http://reviews.llvm.org/D6974
123# CLANG_DEFAULT_UB_CHECKS += object-size
124
125# HOST config
126clang_2nd_arch_prefix :=
127include $(BUILD_SYSTEM)/clang/HOST_$(HOST_ARCH).mk
128
129# HOST_2ND_ARCH config
130ifdef HOST_2ND_ARCH
131clang_2nd_arch_prefix := $(HOST_2ND_ARCH_VAR_PREFIX)
132include $(BUILD_SYSTEM)/clang/HOST_$(HOST_2ND_ARCH).mk
133endif
134
135ifdef HOST_CROSS_OS
136include $(BUILD_SYSTEM)/clang/HOST_CROSS_$(HOST_CROSS_OS).mk
137endif
138
139# TARGET config
140clang_2nd_arch_prefix :=
141include $(BUILD_SYSTEM)/clang/TARGET_$(TARGET_ARCH).mk
142
143# TARGET_2ND_ARCH config
144ifdef TARGET_2ND_ARCH
145clang_2nd_arch_prefix := $(TARGET_2ND_ARCH_VAR_PREFIX)
146include $(BUILD_SYSTEM)/clang/TARGET_$(TARGET_2ND_ARCH).mk
147endif
148
149ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS := -fno-omit-frame-pointer
150ADDRESS_SANITIZER_CONFIG_EXTRA_LDFLAGS := -Wl,-u,__asan_preinit
151
152ADDRESS_SANITIZER_CONFIG_EXTRA_SHARED_LIBRARIES :=
153ADDRESS_SANITIZER_CONFIG_EXTRA_STATIC_LIBRARIES := libasan
154
155# This allows us to use the superset of functionality that compiler-rt
156# provides to Clang (for supporting features like -ftrapv).
157COMPILER_RT_CONFIG_EXTRA_STATIC_LIBRARIES := libcompiler_rt-extras
158
159ifeq ($(HOST_PREFER_32_BIT),true)
160# We don't have 32-bit prebuilt libLLVM/libclang, so force to build them from source.
161FORCE_BUILD_LLVM_COMPONENTS := true
162endif
163