Makefile revision e33218a3ceb3a36e4d8163cf04df0c0cae530b27 
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 := eprintf 10.4 osx ios cc_kext
80
81# On Darwin, fake Clang into using the iOS assembler (since compiler-rt wants to
82# build ARM bits).
83ifeq ($(OS),Darwin)
84CLANG_CCFLAGS += -ccc-install-dir \
85	/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/
86endif
87endif
88
89####
90# The build rules below are designed to be generic and should only need to be
91# modified based on changes in the compiler-rt layout or build system.
92####
93
94# Rule to build the compiler-rt libraries we need.
95#
96# We build all the libraries in a single shot to avoid recursive make as much as
97# possible.
98BuildRuntimeLibraries:
99	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
100	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
101	  ProjObjRoot=$(PROJ_OBJ_DIR) \
102	  CC="$(ToolDir)/clang $(CLANG_CCFLAGS)" \
103	  $(RuntimeDirs:%=clang_%)
104.PHONY: BuildRuntimeLibraries
105CleanRuntimeLibraries:
106	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
107	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
108	  ProjObjRoot=$(PROJ_OBJ_DIR) \
109	  clean
110.PHONY: CleanRuntimeLibraries
111
112$(PROJ_resources_lib):
113	$(Verb) $(MKDIR) $@
114
115# Expand rules for copying/installing each individual library. We can't use
116# implicit rules here because we need to match against multiple things.
117define RuntimeLibraryTemplate
118$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
119	@true
120.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
121
122# Rule to copy the libraries to their resource directory location.
123$(ResourceLibDir)/$1/libclang_rt.%.a: \
124		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
125		$(ResourceLibDir)/$1/.dir
126	$(Echo) Copying runtime library $1/$$* to build dir
127	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
128RuntimeLibrary.$1: \
129		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a)
130.PHONY: RuntimeLibrary.$1
131
132$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
133	$(Verb) $(MKDIR) $$@
134
135$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
136		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
137	$(Echo) Installing compiler runtime library: $1/$$*
138	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
139
140# Rule to install runtime libraries.
141RuntimeLibraryInstall.$1: \
142		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a)
143.PHONY: RuntimeLibraryInstall.$1
144endef
145$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
146
147# Hook into the standard Makefile rules.
148all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
149install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
150clean-local:: CleanRuntimeLibraries
151
152endif
153endif
154endif
155