Makefile revision 94b54ea787e439496fde16b3d2882d6d1b22d4f0 
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 := -no-integrated-as
33
34# We don't currently support building runtime libraries when we are
35# cross-compiling. The issue is that we really want to be set up so that the
36# available compiler targets are independent of the current build.
37#
38# Since we have to build the runtime libraries for the target, it requires we
39# have a cross compiler from the build machine to the target. Although in the
40# case where for the current build (host == target), we do have such a cross
41# compiler, but not defined in a way that is easy for us to reuse. Regardless,
42# that also wouldn't help for other possible compiler configurations.
43#
44# Thus, the simple set up we currently use is to assume that we will be using
45# the just built Clang to compile the compiler-rt libraries. As we grow better
46# cross compilation support inside Clang and tool support in LLVM, this makes it
47# easier for us to achieve the goal of having the compiler targets be easily
48# selected at configure time. However, this design does currently preclude the
49# building of compiler-rt libraries when the Clang itself is being cross
50# compiled.
51#
52# There are three possible solutions:
53#  1. Require building a build-target version of Clang when cross compiling. This
54#     is simplest, but als greatly increases the build time of cross builds.
55#
56#  2. Require cross builds have a build-target version of Clang available for
57#     use. This is a reasonable compromise on #1, as the compiler-rt libraries
58#     are simple enough that there is not a strong desire to ensure they are
59#     built with the exact version of Clang being used. Similarly, as Clang
60#     becomes a better cross compiler it is also increasingly more likely that
61#     the cross compiler being used will already be a version of Clang.
62#
63#  3. Come up with an alternate mechanism to define all the toolchain
64#     information that compiler-rt would need to build libraries for all the
65#     requested targets. This might be a simple short term solution, but is
66#     likely to be unwieldly and irritating to maintain in the long term.
67ifneq ($(LLVM_CROSS_COMPILING),1)
68ifneq ($(CLANG_NO_RUNTIME),1)
69ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK)
70
71# Select the compiler-rt configuration to use, and install directory.
72#
73# FIXME: Eventually, we want some kind of configure support for this. We want to
74# build/install runtime libraries for as many targets as clang was configured to
75# support.
76RuntimeDirs :=
77ifeq ($(OS),Darwin)
78RuntimeDirs += darwin
79RuntimeLibrary.darwin.Configs := \
80	eprintf 10.4 osx ios cc_kext \
81	asan_osx profile_osx profile_ios
82
83# On Darwin, fake Clang into using the iOS assembler (since compiler-rt wants to
84# build ARM bits).
85ifeq ($(OS),Darwin)
86CLANG_CCFLAGS += -ccc-install-dir \
87	/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/
88endif
89endif
90
91####
92# The build rules below are designed to be generic and should only need to be
93# modified based on changes in the compiler-rt layout or build system.
94####
95
96# Rule to build the compiler-rt libraries we need.
97#
98# We build all the libraries in a single shot to avoid recursive make as much as
99# possible.
100BuildRuntimeLibraries:
101	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
102	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
103	  ProjObjRoot=$(PROJ_OBJ_DIR) \
104	  CC="$(ToolDir)/clang $(CLANG_CCFLAGS)" \
105	  $(RuntimeDirs:%=clang_%)
106.PHONY: BuildRuntimeLibraries
107CleanRuntimeLibraries:
108	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
109	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
110	  ProjObjRoot=$(PROJ_OBJ_DIR) \
111	  clean
112.PHONY: CleanRuntimeLibraries
113
114$(PROJ_resources_lib):
115	$(Verb) $(MKDIR) $@
116
117# Expand rules for copying/installing each individual library. We can't use
118# implicit rules here because we need to match against multiple things.
119define RuntimeLibraryTemplate
120$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
121	@true
122.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
123
124# Rule to copy the libraries to their resource directory location.
125$(ResourceLibDir)/$1/libclang_rt.%.a: \
126		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
127		$(ResourceLibDir)/$1/.dir
128	$(Echo) Copying runtime library $1/$$* to build dir
129	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
130RuntimeLibrary.$1: \
131		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a)
132.PHONY: RuntimeLibrary.$1
133
134$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
135	$(Verb) $(MKDIR) $$@
136
137$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
138		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
139	$(Echo) Installing compiler runtime library: $1/$$*
140	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
141
142# Rule to install runtime libraries.
143RuntimeLibraryInstall.$1: \
144		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a)
145.PHONY: RuntimeLibraryInstall.$1
146endef
147$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
148
149# Hook into the standard Makefile rules.
150all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
151install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
152clean-local:: CleanRuntimeLibraries
153
154endif
155endif
156endif
157