Makefile revision 230cdaaab58a2cc00012c5766e396a3eba2aa940
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_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 try to build 32-bit runtimes both on 32-bit hosts and 64-bit hosts.
100Runtime32BitConfigs = \
101	full-i386.a profile-i386.a san-i386.a asan-i386.a ubsan-i386.a \
102	ubsan_cxx-i386.a
103
104# We currently only try to generate runtime libraries on x86.
105ifeq ($(ARCH),x86)
106RuntimeLibrary.linux.Configs += $(Runtime32BitConfigs)
107endif
108
109ifeq ($(ARCH),x86_64)
110RuntimeLibrary.linux.Configs += \
111	full-x86_64.a profile-x86_64.a san-x86_64.a asan-x86_64.a \
112	tsan-x86_64.a msan-x86_64.a ubsan-x86_64.a ubsan_cxx-x86_64.a
113# We need to build 32-bit ASan/UBsan libraries on 64-bit platform, and add them
114# to the list of runtime libraries to make
115# "clang -fsanitize=(address|undefined) -m32" work.
116# We check that Clang can produce working 32-bit binaries by compiling a simple
117# executable.
118test_source = $(LLVM_SRC_ROOT)/tools/clang/runtime/compiler-rt/clang_linux_test_input.c
119ifeq ($(call TryCompile,$(ToolDir)/clang,$(test_source),-m32),0)
120RuntimeLibrary.linux.Configs += $(Runtime32BitConfigs)
121endif
122ifneq ($(LLVM_ANDROID_TOOLCHAIN_DIR),)
123RuntimeLibrary.linux.Configs += asan-arm-android.so
124endif
125endif
126
127endif
128
129####
130# The build rules below are designed to be generic and should only need to be
131# modified based on changes in the compiler-rt layout or build system.
132####
133
134# Rule to build the compiler-rt libraries we need.
135#
136# We build all the libraries in a single shot to avoid recursive make as much as
137# possible.
138BuildRuntimeLibraries:
139	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
140	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
141	  ProjObjRoot=$(PROJ_OBJ_DIR) \
142	  CC="$(ToolDir)/clang" \
143	  LLVM_ANDROID_TOOLCHAIN_DIR="$(LLVM_ANDROID_TOOLCHAIN_DIR)" \
144	  $(RuntimeDirs:%=clang_%)
145.PHONY: BuildRuntimeLibraries
146CleanRuntimeLibraries:
147	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
148	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
149	  ProjObjRoot=$(PROJ_OBJ_DIR) \
150	  clean
151.PHONY: CleanRuntimeLibraries
152
153$(PROJ_resources_lib):
154	$(Verb) $(MKDIR) $@
155
156# Expand rules for copying/installing each individual library. We can't use
157# implicit rules here because we need to match against multiple things.
158define RuntimeLibraryTemplate
159$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
160	@true
161$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.so: BuildRuntimeLibraries
162	@true
163$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.dylib: BuildRuntimeLibraries
164	@true
165.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
166
167# Rule to copy the libraries to their resource directory location.
168$(ResourceLibDir)/$1/libclang_rt.%.a: \
169		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
170		$(ResourceLibDir)/$1/.dir
171	$(Echo) Copying runtime library $1/$$* to build dir
172	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
173$(ResourceLibDir)/$1/libclang_rt.%.so: \
174		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.so \
175		$(ResourceLibDir)/$1/.dir
176	$(Echo) Copying runtime library $1/$$* to build dir
177	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.so $$@
178$(ResourceLibDir)/$1/libclang_rt.%.dylib: \
179		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.dylib \
180		$(ResourceLibDir)/$1/.dir
181	$(Echo) Copying runtime library $1/$$* to build dir
182	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.dylib $$@
183	$(Echo) Fixing LC_ID_DYLIB of $$@
184	$(Verb) install_name_tool $$@ -id $$@
185RuntimeLibrary.$1: \
186		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%)
187.PHONY: RuntimeLibrary.$1
188
189$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
190	$(Verb) $(MKDIR) $$@
191
192$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
193		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
194	$(Echo) Installing compiler runtime library: $1/$$*
195	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
196$(PROJ_resources_lib)/$1/libclang_rt.%.so: \
197		$(ResourceLibDir)/$1/libclang_rt.%.so | $(PROJ_resources_lib)/$1
198	$(Echo) Installing compiler runtime library: $1/$$*
199	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
200$(PROJ_resources_lib)/$1/libclang_rt.%.dylib: \
201		$(ResourceLibDir)/$1/libclang_rt.%.dylib | $(PROJ_resources_lib)/$1
202	$(Echo) Installing compiler runtime library: $1/$$*
203	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
204
205# Rule to install runtime libraries.
206RuntimeLibraryInstall.$1: \
207		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%)
208.PHONY: RuntimeLibraryInstall.$1
209endef
210$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
211
212# Hook into the standard Makefile rules.
213all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
214install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
215clean-local:: CleanRuntimeLibraries
216
217endif
218endif
219endif
220