Makefile revision 75fcb193aeeec5c4f10cc39df60a5ce7526b1b28 
1##===- clang/runtime/compiler-rt/Makefile ------------------*- Makefile -*-===##
2#
3#                     The LLVM Compiler Infrastructure
4#
5# This file is distributed under the University of Illinois Open Source
6# License. See LICENSE.TXT for details.
7#
8##===----------------------------------------------------------------------===##
9#
10# This file defines support for building the Clang runtime libraries (which are
11# implemented by compiler-rt) and placing them in the proper locations in the
12# Clang resources directory (i.e., where the driver expects them).
13#
14##===----------------------------------------------------------------------===##
15
16CLANG_LEVEL := ../..
17include $(CLANG_LEVEL)/Makefile
18
19CLANG_VERSION := $(word 3,$(shell grep "CLANG_VERSION " \
20	$(PROJ_OBJ_DIR)/$(CLANG_LEVEL)/include/clang/Basic/Version.inc))
21
22ResourceDir := $(PROJ_OBJ_ROOT)/$(BuildMode)/lib/clang/$(CLANG_VERSION)
23PROJ_resources := $(DESTDIR)$(PROJ_prefix)/lib/clang/$(CLANG_VERSION)
24
25ResourceLibDir := $(ResourceDir)/lib
26PROJ_resources_lib := $(PROJ_resources)/lib
27
28# Expect compiler-rt to be in llvm/projects/compiler-rt
29COMPILERRT_SRC_ROOT := $(LLVM_SRC_ROOT)/projects/compiler-rt
30
31# We don't currently support building runtime libraries when we are
32# cross-compiling. The issue is that we really want to be set up so that the
33# available compiler targets are independent of the current build.
34#
35# Since we have to build the runtime libraries for the target, it requires we
36# have a cross compiler from the build machine to the target. Although in the
37# case where for the current build (host == target), we do have such a cross
38# compiler, but not defined in a way that is easy for us to reuse. Regardless,
39# that also wouldn't help for other possible compiler configurations.
40#
41# Thus, the simple set up we currently use is to assume that we will be using
42# the just built Clang to compile the compiler-rt libraries. As we grow better
43# cross compilation support inside Clang and tool support in LLVM, this makes it
44# easier for us to achieve the goal of having the compiler targets be easily
45# selected at configure time. However, this design does currently preclude the
46# building of compiler-rt libraries when the Clang itself is being cross
47# compiled.
48#
49# There are three possible solutions:
50#  1. Require building a build-target version of Clang when cross compiling. This
51#     is simplest, but als greatly increases the build time of cross builds.
52#
53#  2. Require cross builds have a build-target version of Clang available for
54#     use. This is a reasonable compromise on #1, as the compiler-rt libraries
55#     are simple enough that there is not a strong desire to ensure they are
56#     built with the exact version of Clang being used. Similarly, as Clang
57#     becomes a better cross compiler it is also increasingly more likely that
58#     the cross compiler being used will already be a version of Clang.
59#
60#  3. Come up with an alternate mechanism to define all the toolchain
61#     information that compiler-rt would need to build libraries for all the
62#     requested targets. This might be a simple short term solution, but is
63#     likely to be unwieldly and irritating to maintain in the long term.
64ifneq ($(LLVM_CROSS_COMPILING),1)
65ifneq ($(CLANG_NO_RUNTIME),1)
66ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK)
67
68# Select the compiler-rt configuration to use, and install directory.
69#
70# FIXME: Eventually, we want some kind of configure support for this. We want to
71# build/install runtime libraries for as many targets as clang was configured to
72# support.
73RuntimeDirs :=
74ifeq ($(OS),Darwin)
75RuntimeDirs += darwin
76RuntimeLibrary.darwin.Configs := \
77	eprintf.a 10.4.a osx.a ios.a cc_kext.a cc_kext_ios5.a \
78	asan_osx.a asan_osx_dynamic.dylib \
79	profile_osx.a profile_ios.a \
80	ubsan_osx.a
81endif
82
83# On Linux, include a library which has all the runtime functions.
84ifeq ($(OS),Linux)
85RuntimeDirs += linux
86RuntimeLibrary.linux.Configs :=
87
88# TryCompile compiler source flags
89# Returns exit code of running a compiler invocation.
90TryCompile = \
91  $(shell \
92    cflags=""; \
93    for flag in $(3); do \
94      cflags="$$cflags $$flag"; \
95    done; \
96    $(1) $$cflags $(2) -o /dev/null > /dev/null 2> /dev/null ; \
97    echo $$?)
98
99# We currently only try to generate runtime libraries on x86.
100ifeq ($(ARCH),x86)
101RuntimeLibrary.linux.Configs += \
102	full-i386.a profile-i386.a asan-i386.a ubsan-i386.a
103endif
104
105ifeq ($(ARCH),x86_64)
106RuntimeLibrary.linux.Configs += \
107	full-x86_64.a profile-x86_64.a asan-x86_64.a tsan-x86_64.a ubsan-x86_64.a
108# We need to build 32-bit ASan/UBsan libraries on 64-bit platform, and add them
109# to the list of runtime libraries to make
110# "clang -fsanitize=(address|undefined) -m32" work.
111# We check that Clang can produce working 32-bit binaries by compiling a simple
112# executable.
113test_source = $(LLVM_SRC_ROOT)/tools/clang/runtime/compiler-rt/clang_linux_test_input.c
114ifeq ($(call TryCompile,$(ToolDir)/clang,$(test_source),-m32),0)
115RuntimeLibrary.linux.Configs += asan-i386.a ubsan-i386.a
116endif
117ifneq ($(LLVM_ANDROID_TOOLCHAIN_DIR),)
118RuntimeLibrary.linux.Configs += asan-arm-android.so
119endif
120endif
121
122endif
123
124####
125# The build rules below are designed to be generic and should only need to be
126# modified based on changes in the compiler-rt layout or build system.
127####
128
129# Rule to build the compiler-rt libraries we need.
130#
131# We build all the libraries in a single shot to avoid recursive make as much as
132# possible.
133BuildRuntimeLibraries:
134	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
135	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
136	  ProjObjRoot=$(PROJ_OBJ_DIR) \
137	  CC="$(ToolDir)/clang" \
138	  LLVM_ANDROID_TOOLCHAIN_DIR="$(LLVM_ANDROID_TOOLCHAIN_DIR)" \
139	  $(RuntimeDirs:%=clang_%)
140.PHONY: BuildRuntimeLibraries
141CleanRuntimeLibraries:
142	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
143	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
144	  ProjObjRoot=$(PROJ_OBJ_DIR) \
145	  clean
146.PHONY: CleanRuntimeLibraries
147
148$(PROJ_resources_lib):
149	$(Verb) $(MKDIR) $@
150
151# Expand rules for copying/installing each individual library. We can't use
152# implicit rules here because we need to match against multiple things.
153define RuntimeLibraryTemplate
154$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
155	@true
156$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.so: BuildRuntimeLibraries
157	@true
158$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.dylib: BuildRuntimeLibraries
159	@true
160.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
161
162# Rule to copy the libraries to their resource directory location.
163$(ResourceLibDir)/$1/libclang_rt.%.a: \
164		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
165		$(ResourceLibDir)/$1/.dir
166	$(Echo) Copying runtime library $1/$$* to build dir
167	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
168$(ResourceLibDir)/$1/libclang_rt.%.so: \
169		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.so \
170		$(ResourceLibDir)/$1/.dir
171	$(Echo) Copying runtime library $1/$$* to build dir
172	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.so $$@
173$(ResourceLibDir)/$1/libclang_rt.%.dylib: \
174		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.dylib \
175		$(ResourceLibDir)/$1/.dir
176	$(Echo) Copying runtime library $1/$$* to build dir
177	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.dylib $$@
178	$(Echo) Fixing LC_ID_DYLIB of $$@
179	$(Verb) install_name_tool $$@ -id $$@
180RuntimeLibrary.$1: \
181		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%)
182.PHONY: RuntimeLibrary.$1
183
184$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
185	$(Verb) $(MKDIR) $$@
186
187$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
188		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
189	$(Echo) Installing compiler runtime library: $1/$$*
190	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
191$(PROJ_resources_lib)/$1/libclang_rt.%.so: \
192		$(ResourceLibDir)/$1/libclang_rt.%.so | $(PROJ_resources_lib)/$1
193	$(Echo) Installing compiler runtime library: $1/$$*
194	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
195$(PROJ_resources_lib)/$1/libclang_rt.%.dylib: \
196		$(ResourceLibDir)/$1/libclang_rt.%.dylib | $(PROJ_resources_lib)/$1
197	$(Echo) Installing compiler runtime library: $1/$$*
198	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
199
200# Rule to install runtime libraries.
201RuntimeLibraryInstall.$1: \
202		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%)
203.PHONY: RuntimeLibraryInstall.$1
204endef
205$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
206
207# Hook into the standard Makefile rules.
208all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
209install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
210clean-local:: CleanRuntimeLibraries
211
212endif
213endif
214endif
215