Makefile revision a0889a8c3299b1950e0a2dfa1d1656e5aa60f193 
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 := $(LLVM_SRC_ROOT)/projects/compiler-rt
30
31# Additional flags to pass to Clang.
32CLANG_CCFLAGS :=
33ifeq ($(ARCH), arm)
34CLANG_CCFLAGS += -no-integrated-as
35endif
36
37# We don't currently support building runtime libraries when we are
38# cross-compiling. The issue is that we really want to be set up so that the
39# available compiler targets are independent of the current build.
40#
41# Since we have to build the runtime libraries for the target, it requires we
42# have a cross compiler from the build machine to the target. Although in the
43# case where for the current build (host == target), we do have such a cross
44# compiler, but not defined in a way that is easy for us to reuse. Regardless,
45# that also wouldn't help for other possible compiler configurations.
46#
47# Thus, the simple set up we currently use is to assume that we will be using
48# the just built Clang to compile the compiler-rt libraries. As we grow better
49# cross compilation support inside Clang and tool support in LLVM, this makes it
50# easier for us to achieve the goal of having the compiler targets be easily
51# selected at configure time. However, this design does currently preclude the
52# building of compiler-rt libraries when the Clang itself is being cross
53# compiled.
54#
55# There are three possible solutions:
56#  1. Require building a build-target version of Clang when cross compiling. This
57#     is simplest, but als greatly increases the build time of cross builds.
58#
59#  2. Require cross builds have a build-target version of Clang available for
60#     use. This is a reasonable compromise on #1, as the compiler-rt libraries
61#     are simple enough that there is not a strong desire to ensure they are
62#     built with the exact version of Clang being used. Similarly, as Clang
63#     becomes a better cross compiler it is also increasingly more likely that
64#     the cross compiler being used will already be a version of Clang.
65#
66#  3. Come up with an alternate mechanism to define all the toolchain
67#     information that compiler-rt would need to build libraries for all the
68#     requested targets. This might be a simple short term solution, but is
69#     likely to be unwieldly and irritating to maintain in the long term.
70ifneq ($(LLVM_CROSS_COMPILING),1)
71ifneq ($(CLANG_NO_RUNTIME),1)
72ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK)
73
74# Select the compiler-rt configuration to use, and install directory.
75#
76# FIXME: Eventually, we want some kind of configure support for this. We want to
77# build/install runtime libraries for as many targets as clang was configured to
78# support.
79RuntimeDirs :=
80ifeq ($(OS),Darwin)
81RuntimeDirs += darwin
82RuntimeLibrary.darwin.Configs := \
83	eprintf 10.4 osx ios cc_kext \
84	asan_osx profile_osx profile_ios
85
86# On Darwin, fake Clang into using the iOS assembler (since compiler-rt wants to
87# build ARM bits).
88CLANG_CCFLAGS += -ccc-install-dir \
89	/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/
90endif
91
92# On Linux, include a library which has all the runtime functions.
93ifeq ($(OS),Linux)
94RuntimeDirs += linux
95RuntimeLibrary.linux.Configs :=
96
97# We currently only try to generate runtime libraries on x86.
98ifeq ($(ARCH),x86)
99RuntimeLibrary.linux.Configs += \
100	full-i386 profile-i386 asan-i386
101endif
102ifeq ($(ARCH),x86_64)
103RuntimeLibrary.linux.Configs += \
104	full-x86_64 profile-x86_64 asan-x86_64
105endif
106
107endif
108
109####
110# The build rules below are designed to be generic and should only need to be
111# modified based on changes in the compiler-rt layout or build system.
112####
113
114# Rule to build the compiler-rt libraries we need.
115#
116# We build all the libraries in a single shot to avoid recursive make as much as
117# possible.
118BuildRuntimeLibraries:
119	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
120	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
121	  ProjObjRoot=$(PROJ_OBJ_DIR) \
122	  CC="$(ToolDir)/clang $(CLANG_CCFLAGS)" \
123	  $(RuntimeDirs:%=clang_%)
124.PHONY: BuildRuntimeLibraries
125CleanRuntimeLibraries:
126	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
127	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
128	  ProjObjRoot=$(PROJ_OBJ_DIR) \
129	  clean
130.PHONY: CleanRuntimeLibraries
131
132$(PROJ_resources_lib):
133	$(Verb) $(MKDIR) $@
134
135# Expand rules for copying/installing each individual library. We can't use
136# implicit rules here because we need to match against multiple things.
137define RuntimeLibraryTemplate
138$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
139	@true
140.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
141
142# Rule to copy the libraries to their resource directory location.
143$(ResourceLibDir)/$1/libclang_rt.%.a: \
144		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
145		$(ResourceLibDir)/$1/.dir
146	$(Echo) Copying runtime library $1/$$* to build dir
147	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
148RuntimeLibrary.$1: \
149		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a)
150.PHONY: RuntimeLibrary.$1
151
152$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
153	$(Verb) $(MKDIR) $$@
154
155$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
156		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
157	$(Echo) Installing compiler runtime library: $1/$$*
158	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
159
160# Rule to install runtime libraries.
161RuntimeLibraryInstall.$1: \
162		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a)
163.PHONY: RuntimeLibraryInstall.$1
164endef
165$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
166
167# Hook into the standard Makefile rules.
168all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
169install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
170clean-local:: CleanRuntimeLibraries
171
172endif
173endif
174endif
175