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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
26ResourceIncludeDir := $(ResourceDir)/include
27PROJ_resources_lib := $(PROJ_resources)/lib
28PROJ_resources_include := $(PROJ_resources)/include
29
30# Expect compiler-rt to be in llvm/projects/compiler-rt
31COMPILERRT_SRC_ROOT := $(LLVM_SRC_ROOT)/projects/compiler-rt
32
33# We don't currently support building runtime libraries when we are
34# cross-compiling. The issue is that we really want to be set up so that the
35# available compiler targets are independent of the current build.
36#
37# Since we have to build the runtime libraries for the target, it requires we
38# have a cross compiler from the build machine to the target. Although in the
39# case where for the current build (host == target), we do have such a cross
40# compiler, but not defined in a way that is easy for us to reuse. Regardless,
41# that also wouldn't help for other possible compiler configurations.
42#
43# Thus, the simple set up we currently use is to assume that we will be using
44# the just built Clang to compile the compiler-rt libraries. As we grow better
45# cross compilation support inside Clang and tool support in LLVM, this makes it
46# easier for us to achieve the goal of having the compiler targets be easily
47# selected at configure time. However, this design does currently preclude the
48# building of compiler-rt libraries when the Clang itself is being cross
49# compiled.
50#
51# There are three possible solutions:
52#  1. Require building a build-target version of Clang when cross compiling. This
53#     is simplest, but als greatly increases the build time of cross builds.
54#
55#  2. Require cross builds have a build-target version of Clang available for
56#     use. This is a reasonable compromise on #1, as the compiler-rt libraries
57#     are simple enough that there is not a strong desire to ensure they are
58#     built with the exact version of Clang being used. Similarly, as Clang
59#     becomes a better cross compiler it is also increasingly more likely that
60#     the cross compiler being used will already be a version of Clang.
61#
62#  3. Come up with an alternate mechanism to define all the toolchain
63#     information that compiler-rt would need to build libraries for all the
64#     requested targets. This might be a simple short term solution, but is
65#     likely to be unwieldy and irritating to maintain in the long term.
66ifneq ($(LLVM_CROSS_COMPILING),1)
67ifneq ($(CLANG_NO_RUNTIME),1)
68ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK)
69
70# Select the compiler-rt configuration to use, and install directory.
71#
72# FIXME: Eventually, we want some kind of configure support for this. We want to
73# build/install runtime libraries for as many targets as clang was configured to
74# support.
75RuntimeDirs :=
76ifeq ($(OS),Darwin)
77RuntimeDirs += darwin macho_embedded
78RuntimeLibrary.darwin.Configs := \
79	eprintf.a 10.4.a osx.a cc_kext.a \
80	asan_osx_dynamic.dylib \
81	profile_osx.a \
82	ubsan_osx_dynamic.dylib
83
84IOS_SDK := $(shell xcrun --show-sdk-path -sdk iphoneos 2> /dev/null)
85IOSSIM_SDK := $(shell xcrun --show-sdk-path -sdk iphonesimulator 2> /dev/null)
86
87ifneq ($(IOS_SDK)$(IOSSIM_SDK),)
88RuntimeLibrary.darwin.Configs += ios.a profile_ios.a
89endif
90
91ifneq ($(IOS_SDK),)
92ifneq (,$(filter ARM AARCH64,$(TARGETS_TO_BUILD)))
93RuntimeLibrary.darwin.Configs += cc_kext_ios.a
94endif
95endif
96
97ifneq ($(IOSSIM_SDK),)
98RuntimeLibrary.darwin.Configs += asan_iossim_dynamic.dylib \
99                                 ubsan_iossim_dynamic.dylib
100endif
101
102RuntimeLibrary.macho_embedded.Configs := \
103	hard_static.a hard_pic.a
104ifneq (,$(findstring ARM,$(TARGETS_TO_BUILD)))
105RuntimeLibrary.macho_embedded.Configs += \
106	soft_static.a soft_pic.a
107endif
108endif
109
110# On Linux, include a library which has all the runtime functions.
111ifeq ($(OS),Linux)
112RuntimeDirs += linux
113RuntimeLibrary.linux.Configs :=
114
115# TryCompile compiler source flags
116# Returns exit code of running a compiler invocation.
117TryCompile = \
118  $(shell \
119    cflags=""; \
120    for flag in $(3); do \
121      cflags="$$cflags $$flag"; \
122    done; \
123    $(1) $$cflags $(2) -o /dev/null > /dev/null 2> /dev/null ; \
124    echo $$?)
125
126# We try to build 32-bit runtimes both on 32-bit hosts and 64-bit hosts.
127Runtime32BitConfigs = \
128	builtins-i386.a profile-i386.a
129
130# We currently only try to generate runtime libraries on x86.
131ifeq ($(ARCH),x86)
132RuntimeLibrary.linux.Configs += $(Runtime32BitConfigs)
133endif
134
135ifeq ($(ARCH),x86_64)
136RuntimeLibrary.linux.Configs += \
137	builtins-x86_64.a profile-x86_64.a
138# We need to build 32-bit libraries on 64-bit platform, and add them
139# to the list of runtime libraries to make "clang -m32" work.
140# We check that Clang can produce working 32-bit binaries by compiling a simple
141# executable.
142test_source = $(LLVM_SRC_ROOT)/tools/clang/runtime/compiler-rt/clang_linux_test_input.c
143ifeq ($(call TryCompile,$(ToolDir)/clang,$(test_source),-m32),0)
144RuntimeLibrary.linux.Configs += $(Runtime32BitConfigs)
145endif
146endif
147
148endif
149
150####
151# The build rules below are designed to be generic and should only need to be
152# modified based on changes in the compiler-rt layout or build system.
153####
154
155# Rule to build the compiler-rt libraries we need.
156#
157# We build all the libraries in a single shot to avoid recursive make as much as
158# possible.
159BuildRuntimeLibraries:
160	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
161	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
162	  ProjObjRoot=$(PROJ_OBJ_DIR) \
163	  CC="$(ToolDir)/clang" \
164	  VERBOSE=$(VERBOSE) \
165	  $(RuntimeDirs:%=clang_%)
166.PHONY: BuildRuntimeLibraries
167CleanRuntimeLibraries:
168	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
169	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
170	  ProjObjRoot=$(PROJ_OBJ_DIR) \
171	  VERBOSE=$(VERBOSE) \
172	  clean
173.PHONY: CleanRuntimeLibraries
174RuntimeHeader: $(ResourceIncludeDir)/sanitizer
175
176$(PROJ_resources_lib):
177	$(Verb) $(MKDIR) $@
178
179$(ResourceIncludeDir):
180	$(Verb) $(MKDIR) $@
181
182$(ResourceIncludeDir)/sanitizer: $(ResourceIncludeDir)
183	$(Verb) $(MKDIR) $@
184	$(Verb) cp $(COMPILERRT_SRC_ROOT)/include/sanitizer/*.h $@
185
186# Expand rules for copying/installing each individual library. We can't use
187# implicit rules here because we need to match against multiple things.
188define RuntimeLibraryTemplate
189$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
190	@true
191$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.so: BuildRuntimeLibraries
192	@true
193$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.dylib: BuildRuntimeLibraries
194	@true
195.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
196
197# Rule to copy the libraries to their resource directory location.
198$(ResourceLibDir)/$1/libclang_rt.%.a: \
199		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
200		$(ResourceLibDir)/$1/.dir
201	$(Echo) Copying runtime library $1/$$* to build dir
202	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
203$(ResourceLibDir)/$1/libclang_rt.%.so: \
204		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.so \
205		$(ResourceLibDir)/$1/.dir
206	$(Echo) Copying runtime library $1/$$* to build dir
207	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.so $$@
208$(ResourceLibDir)/$1/libclang_rt.%.dylib: \
209		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.dylib \
210		$(ResourceLibDir)/$1/.dir
211	$(Echo) Copying runtime library $1/$$* to build dir
212	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.dylib $$@
213RuntimeLibrary.$1: \
214		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%)
215.PHONY: RuntimeLibrary.$1
216
217$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
218	$(Verb) $(MKDIR) $$@
219
220$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
221		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
222	$(Echo) Installing compiler runtime library: $1/$$*
223	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
224$(PROJ_resources_lib)/$1/libclang_rt.%.so: \
225		$(ResourceLibDir)/$1/libclang_rt.%.so | $(PROJ_resources_lib)/$1
226	$(Echo) Installing compiler runtime library: $1/$$*
227	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
228$(PROJ_resources_lib)/$1/libclang_rt.%.dylib: \
229		$(ResourceLibDir)/$1/libclang_rt.%.dylib | $(PROJ_resources_lib)/$1
230	$(Echo) Installing compiler runtime library: $1/$$*
231	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
232
233# Rule to install runtime libraries.
234RuntimeLibraryInstall.$1: \
235		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%)
236.PHONY: RuntimeLibraryInstall.$1
237endef
238$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
239
240$(PROJ_resources_include):
241	$(Verb) $(MKDIR) $@
242
243$(PROJ_resources_include)/sanitizer: $(ResourceIncludeDir)/sanitizer $(PROJ_resources_include)
244	$(Verb) $(MKDIR) $@
245	$(Echo) Installing compiler runtime headers
246	$(Verb) $(DataInstall) $(ResourceIncludeDir)/sanitizer/* \
247                               $(PROJ_resources_include)/sanitizer
248
249RuntimeHeaderInstall: $(PROJ_resources_include)/sanitizer
250.PHONY: RuntimeHeaderInstall
251
252# Hook into the standard Makefile rules.
253all-local:: $(RuntimeDirs:%=RuntimeLibrary.%) RuntimeHeader
254install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%) RuntimeHeaderInstall
255clean-local:: CleanRuntimeLibraries
256
257endif
258endif
259endif
260