Makefile revision ff9865220ccd618cab2d8fbc63e58ac6cd7357f0
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 += full-i386 97endif 98ifeq ($(ARCH),x86_64) 99RuntimeLibrary.linux.Configs += full-x86_64 100endif 101 102endif 103 104#### 105# The build rules below are designed to be generic and should only need to be 106# modified based on changes in the compiler-rt layout or build system. 107#### 108 109# Rule to build the compiler-rt libraries we need. 110# 111# We build all the libraries in a single shot to avoid recursive make as much as 112# possible. 113BuildRuntimeLibraries: 114 $(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \ 115 ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \ 116 ProjObjRoot=$(PROJ_OBJ_DIR) \ 117 CC="$(ToolDir)/clang $(CLANG_CCFLAGS)" \ 118 $(RuntimeDirs:%=clang_%) 119.PHONY: BuildRuntimeLibraries 120CleanRuntimeLibraries: 121 $(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \ 122 ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \ 123 ProjObjRoot=$(PROJ_OBJ_DIR) \ 124 clean 125.PHONY: CleanRuntimeLibraries 126 127$(PROJ_resources_lib): 128 $(Verb) $(MKDIR) $@ 129 130# Expand rules for copying/installing each individual library. We can't use 131# implicit rules here because we need to match against multiple things. 132define RuntimeLibraryTemplate 133$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries 134 @true 135.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a 136 137# Rule to copy the libraries to their resource directory location. 138$(ResourceLibDir)/$1/libclang_rt.%.a: \ 139 $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \ 140 $(ResourceLibDir)/$1/.dir 141 $(Echo) Copying runtime library $1/$$* to build dir 142 $(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@ 143RuntimeLibrary.$1: \ 144 $(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a) 145.PHONY: RuntimeLibrary.$1 146 147$(PROJ_resources_lib)/$1: $(PROJ_resources_lib) 148 $(Verb) $(MKDIR) $$@ 149 150$(PROJ_resources_lib)/$1/libclang_rt.%.a: \ 151 $(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1 152 $(Echo) Installing compiler runtime library: $1/$$* 153 $(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1 154 155# Rule to install runtime libraries. 156RuntimeLibraryInstall.$1: \ 157 $(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a) 158.PHONY: RuntimeLibraryInstall.$1 159endef 160$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib)))) 161 162# Hook into the standard Makefile rules. 163all-local:: $(RuntimeDirs:%=RuntimeLibrary.%) 164install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%) 165clean-local:: CleanRuntimeLibraries 166 167endif 168endif 169endif 170