forked from OSchip/llvm-project
164 lines
6.2 KiB
Makefile
164 lines
6.2 KiB
Makefile
##===- clang/runtime/compiler-rt/Makefile ------------------*- Makefile -*-===##
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#
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# The LLVM Compiler Infrastructure
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#
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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#
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##===----------------------------------------------------------------------===##
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#
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# This file defines support for building the Clang runtime libraries (which are
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# implemented by compiler-rt) and placing them in the proper locations in the
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# Clang resources directory (i.e., where the driver expects them).
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#
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##===----------------------------------------------------------------------===##
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CLANG_LEVEL := ../..
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include $(CLANG_LEVEL)/Makefile
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CLANG_VERSION := $(word 3,$(shell grep "CLANG_VERSION " \
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$(PROJ_OBJ_DIR)/$(CLANG_LEVEL)/include/clang/Basic/Version.inc))
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ResourceDir := $(PROJ_OBJ_ROOT)/$(BuildMode)/lib/clang/$(CLANG_VERSION)
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PROJ_resources := $(DESTDIR)$(PROJ_prefix)/lib/clang/$(CLANG_VERSION)
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ResourceLibDir := $(ResourceDir)/lib
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PROJ_resources_lib := $(PROJ_resources)/lib
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# Expect compiler-rt to be in llvm/projects/compiler-rt
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COMPILERRT_SRC_ROOT := $(LLVM_SRC_ROOT)/projects/compiler-rt
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# We don't currently support building runtime libraries when we are
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# cross-compiling. The issue is that we really want to be set up so that the
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# available compiler targets are independent of the current build.
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#
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# Since we have to build the runtime libraries for the target, it requires we
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# have a cross compiler from the build machine to the target. Although in the
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# case where for the current build (host == target), we do have such a cross
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# compiler, but not defined in a way that is easy for us to reuse. Regardless,
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# that also wouldn't help for other possible compiler configurations.
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#
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# Thus, the simple set up we currently use is to assume that we will be using
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# the just built Clang to compile the compiler-rt libraries. As we grow better
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# cross compilation support inside Clang and tool support in LLVM, this makes it
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# easier for us to achieve the goal of having the compiler targets be easily
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# selected at configure time. However, this design does currently preclude the
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# building of compiler-rt libraries when the Clang itself is being cross
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# compiled.
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#
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# There are three possible solutions:
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# 1. Require building a build-target version of Clang when cross compiling. This
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# is simplest, but als greatly increases the build time of cross builds.
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#
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# 2. Require cross builds have a build-target version of Clang available for
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# use. This is a reasonable compromise on #1, as the compiler-rt libraries
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# are simple enough that there is not a strong desire to ensure they are
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# built with the exact version of Clang being used. Similarly, as Clang
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# becomes a better cross compiler it is also increasingly more likely that
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# the cross compiler being used will already be a version of Clang.
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#
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# 3. Come up with an alternate mechanism to define all the toolchain
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# information that compiler-rt would need to build libraries for all the
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# requested targets. This might be a simple short term solution, but is
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# likely to be unwieldly and irritating to maintain in the long term.
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ifneq ($(LLVM_CROSS_COMPILING),1)
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ifneq ($(CLANG_NO_RUNTIME),1)
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ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK)
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# Select the compiler-rt configuration to use, and install directory.
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#
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# FIXME: Eventually, we want some kind of configure support for this. We want to
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# build/install runtime libraries for as many targets as clang was configured to
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# support.
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RuntimeDirs :=
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ifeq ($(OS),Darwin)
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RuntimeDirs += darwin
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RuntimeLibrary.darwin.Configs := \
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eprintf 10.4 osx ios cc_kext \
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asan_osx profile_osx profile_ios
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endif
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# On Linux, include a library which has all the runtime functions.
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ifeq ($(OS),Linux)
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RuntimeDirs += linux
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RuntimeLibrary.linux.Configs :=
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# We currently only try to generate runtime libraries on x86.
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ifeq ($(ARCH),x86)
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RuntimeLibrary.linux.Configs += \
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full-i386 profile-i386 asan-i386
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endif
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ifeq ($(ARCH),x86_64)
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RuntimeLibrary.linux.Configs += \
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full-x86_64 profile-x86_64 asan-x86_64
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endif
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endif
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####
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# The build rules below are designed to be generic and should only need to be
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# modified based on changes in the compiler-rt layout or build system.
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####
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# Rule to build the compiler-rt libraries we need.
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#
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# We build all the libraries in a single shot to avoid recursive make as much as
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# possible.
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BuildRuntimeLibraries:
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$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
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ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
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ProjObjRoot=$(PROJ_OBJ_DIR) \
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CC="$(ToolDir)/clang" \
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$(RuntimeDirs:%=clang_%)
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.PHONY: BuildRuntimeLibraries
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CleanRuntimeLibraries:
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$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
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ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
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ProjObjRoot=$(PROJ_OBJ_DIR) \
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clean
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.PHONY: CleanRuntimeLibraries
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$(PROJ_resources_lib):
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$(Verb) $(MKDIR) $@
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# Expand rules for copying/installing each individual library. We can't use
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# implicit rules here because we need to match against multiple things.
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define RuntimeLibraryTemplate
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$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
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@true
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.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
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# Rule to copy the libraries to their resource directory location.
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$(ResourceLibDir)/$1/libclang_rt.%.a: \
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$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
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$(ResourceLibDir)/$1/.dir
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$(Echo) Copying runtime library $1/$$* to build dir
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$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
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RuntimeLibrary.$1: \
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$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a)
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.PHONY: RuntimeLibrary.$1
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$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
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$(Verb) $(MKDIR) $$@
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$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
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$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
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$(Echo) Installing compiler runtime library: $1/$$*
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$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
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# Rule to install runtime libraries.
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RuntimeLibraryInstall.$1: \
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$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a)
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.PHONY: RuntimeLibraryInstall.$1
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endef
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$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
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# Hook into the standard Makefile rules.
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all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
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install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
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clean-local:: CleanRuntimeLibraries
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endif
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endif
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endif
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