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 16 CLANG_LEVEL := ../.. 17 include $(CLANG_LEVEL)/Makefile 18 19 CLANG_VERSION := $(word 3,$(shell grep "CLANG_VERSION " \ 20 $(PROJ_OBJ_DIR)/$(CLANG_LEVEL)/include/clang/Basic/Version.inc)) 21 22 ResourceDir := $(PROJ_OBJ_ROOT)/$(BuildMode)/lib/clang/$(CLANG_VERSION) 23 PROJ_resources := $(DESTDIR)$(PROJ_prefix)/lib/clang/$(CLANG_VERSION) 24 25 ResourceLibDir := $(ResourceDir)/lib 26 PROJ_resources_lib := $(PROJ_resources)/lib 27 28 # Expect compiler-rt to be in llvm/projects/compiler-rt 29 COMPILERRT_SRC_ROOT := $(LLVM_SRC_ROOT)/projects/compiler-rt 30 31 # We don't currently support building runtime libraries when we are 32 # cross-compiling. The issue is that we really want to be set up so that the 33 # available compiler targets are independent of the current build. 34 # 35 # Since we have to build the runtime libraries for the target, it requires we 36 # have a cross compiler from the build machine to the target. Although in the 37 # case where for the current build (host == target), we do have such a cross 38 # compiler, but not defined in a way that is easy for us to reuse. Regardless, 39 # that also wouldn't help for other possible compiler configurations. 40 # 41 # Thus, the simple set up we currently use is to assume that we will be using 42 # the just built Clang to compile the compiler-rt libraries. As we grow better 43 # cross compilation support inside Clang and tool support in LLVM, this makes it 44 # easier for us to achieve the goal of having the compiler targets be easily 45 # selected at configure time. However, this design does currently preclude the 46 # building of compiler-rt libraries when the Clang itself is being cross 47 # compiled. 48 # 49 # There are three possible solutions: 50 # 1. Require building a build-target version of Clang when cross compiling. This 51 # is simplest, but als greatly increases the build time of cross builds. 52 # 53 # 2. Require cross builds have a build-target version of Clang available for 54 # use. This is a reasonable compromise on #1, as the compiler-rt libraries 55 # are simple enough that there is not a strong desire to ensure they are 56 # built with the exact version of Clang being used. Similarly, as Clang 57 # becomes a better cross compiler it is also increasingly more likely that 58 # the cross compiler being used will already be a version of Clang. 59 # 60 # 3. Come up with an alternate mechanism to define all the toolchain 61 # information that compiler-rt would need to build libraries for all the 62 # requested targets. This might be a simple short term solution, but is 63 # likely to be unwieldly and irritating to maintain in the long term. 64 ifneq ($(LLVM_CROSS_COMPILING),1) 65 ifneq ($(CLANG_NO_RUNTIME),1) 66 ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK) 67 68 # Select the compiler-rt configuration to use, and install directory. 69 # 70 # FIXME: Eventually, we want some kind of configure support for this. We want to 71 # build/install runtime libraries for as many targets as clang was configured to 72 # support. 73 RuntimeDirs := 74 ifeq ($(OS),Darwin) 75 RuntimeDirs += darwin 76 RuntimeLibrary.darwin.Configs := \ 77 eprintf 10.4 osx ios cc_kext \ 78 asan_osx profile_osx profile_ios 79 endif 80 81 # On Linux, include a library which has all the runtime functions. 82 ifeq ($(OS),Linux) 83 RuntimeDirs += linux 84 RuntimeLibrary.linux.Configs := 85 86 # We currently only try to generate runtime libraries on x86. 87 ifeq ($(ARCH),x86) 88 RuntimeLibrary.linux.Configs += \ 89 full-i386 profile-i386 asan-i386 90 endif 91 ifeq ($(ARCH),x86_64) 92 RuntimeLibrary.linux.Configs += \ 93 full-x86_64 profile-x86_64 asan-x86_64 94 endif 95 96 endif 97 98 #### 99 # The build rules below are designed to be generic and should only need to be 100 # modified based on changes in the compiler-rt layout or build system. 101 #### 102 103 # Rule to build the compiler-rt libraries we need. 104 # 105 # We build all the libraries in a single shot to avoid recursive make as much as 106 # possible. 107 BuildRuntimeLibraries: 108 $(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \ 109 ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \ 110 ProjObjRoot=$(PROJ_OBJ_DIR) \ 111 CC="$(ToolDir)/clang" \ 112 $(RuntimeDirs:%=clang_%) 113 .PHONY: BuildRuntimeLibraries 114 CleanRuntimeLibraries: 115 $(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \ 116 ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \ 117 ProjObjRoot=$(PROJ_OBJ_DIR) \ 118 clean 119 .PHONY: CleanRuntimeLibraries 120 121 $(PROJ_resources_lib): 122 $(Verb) $(MKDIR) $@ 123 124 # Expand rules for copying/installing each individual library. We can't use 125 # implicit rules here because we need to match against multiple things. 126 define RuntimeLibraryTemplate 127 $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries 128 @true 129 .PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a 130 131 # Rule to copy the libraries to their resource directory location. 132 $(ResourceLibDir)/$1/libclang_rt.%.a: \ 133 $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \ 134 $(ResourceLibDir)/$1/.dir 135 $(Echo) Copying runtime library $1/$$* to build dir 136 $(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@ 137 RuntimeLibrary.$1: \ 138 $(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a) 139 .PHONY: RuntimeLibrary.$1 140 141 $(PROJ_resources_lib)/$1: $(PROJ_resources_lib) 142 $(Verb) $(MKDIR) $$@ 143 144 $(PROJ_resources_lib)/$1/libclang_rt.%.a: \ 145 $(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1 146 $(Echo) Installing compiler runtime library: $1/$$* 147 $(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1 148 149 # Rule to install runtime libraries. 150 RuntimeLibraryInstall.$1: \ 151 $(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a) 152 .PHONY: RuntimeLibraryInstall.$1 153 endef 154 $(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib)))) 155 156 # Hook into the standard Makefile rules. 157 all-local:: $(RuntimeDirs:%=RuntimeLibrary.%) 158 install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%) 159 clean-local:: CleanRuntimeLibraries 160 161 endif 162 endif 163 endif 164
