Makefile revision 7df67e6892d74a6653473089473166a30608f416 
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).
85CLANG_CCFLAGS += -ccc-install-dir \
86	/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/
87endif
88
89# On Linux, include a library which has all the runtime functions.
90ifeq ($(OS),Linux)
91RuntimeDirs += linux
92RuntimeLibrary.linux.Configs :=
93
94# We currently only try to generate runtime libraries on x86.
95ifeq ($(ARCH),x86)
96RuntimeLibrary.linux.Configs += \
97	full-i386 profile-i386 asan-i386
98endif
99ifeq ($(ARCH),x86_64)
100RuntimeLibrary.linux.Configs += \
101	full-x86_64 profile-x86_64 asan-x86_64
102endif
103
104endif
105
106####
107# The build rules below are designed to be generic and should only need to be
108# modified based on changes in the compiler-rt layout or build system.
109####
110
111# Rule to build the compiler-rt libraries we need.
112#
113# We build all the libraries in a single shot to avoid recursive make as much as
114# possible.
115BuildRuntimeLibraries:
116	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
117	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
118	  ProjObjRoot=$(PROJ_OBJ_DIR) \
119	  CC="$(ToolDir)/clang $(CLANG_CCFLAGS)" \
120	  $(RuntimeDirs:%=clang_%)
121.PHONY: BuildRuntimeLibraries
122CleanRuntimeLibraries:
123	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
124	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
125	  ProjObjRoot=$(PROJ_OBJ_DIR) \
126	  clean
127.PHONY: CleanRuntimeLibraries
128
129$(PROJ_resources_lib):
130	$(Verb) $(MKDIR) $@
131
132# Expand rules for copying/installing each individual library. We can't use
133# implicit rules here because we need to match against multiple things.
134define RuntimeLibraryTemplate
135$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
136	@true
137.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
138
139# Rule to copy the libraries to their resource directory location.
140$(ResourceLibDir)/$1/libclang_rt.%.a: \
141		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
142		$(ResourceLibDir)/$1/.dir
143	$(Echo) Copying runtime library $1/$$* to build dir
144	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
145RuntimeLibrary.$1: \
146		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a)
147.PHONY: RuntimeLibrary.$1
148
149$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
150	$(Verb) $(MKDIR) $$@
151
152$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
153		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
154	$(Echo) Installing compiler runtime library: $1/$$*
155	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
156
157# Rule to install runtime libraries.
158RuntimeLibraryInstall.$1: \
159		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a)
160.PHONY: RuntimeLibraryInstall.$1
161endef
162$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
163
164# Hook into the standard Makefile rules.
165all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
166install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
167clean-local:: CleanRuntimeLibraries
168
169endif
170endif
171endif
172