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685b7a7a1b
094772656d71b3f5022ae292094e878da035de9e build: support LTO in depends (fanquake)
Pull request description:
This adds an `LTO` option to depends, i.e `make -C depends LTO=1`, which passes `-flto` when building packages (not currently qt), and automatically configures with `--enable-lto` when doing a build using a `CONFIG_SITE`.
The following tables comapres the size (in bytes) of the stripped `x86_64` Linux binaries produced with master and this PR (full depends build):
| Binary | stripped master | stripped LTO=1 | saving |
| -------- | ----------------: | -------------: | --------: |
| bitcoin-cli | 1178632 | 469872 | 60% |
| bitcoin-tx | 2710584 | 1866504 | 31% |
| bitcoin-util | 952880 | 240104 | 74% |
| bitcoin-wallet | 7992888 | 5365984 | 32% |
| bitcoind | 13421336 | 11868592 | 12% |
| bitcoin-qt | 37680496 | 31640976 | 16% |
ACKs for top commit:
laanwj:
Tested ACK 094772656d71b3f5022ae292094e878da035de9e
Tree-SHA512: 6b8483ea490e57a153105ad8c38b25fb1af5d55b1af22db398c7c2573612aaf71b4d2b4cf09c18fd6331b1358dba01641eeaa03e5018a925392e1937118d984a
131 lines
5.7 KiB
Makefile
131 lines
5.7 KiB
Makefile
OSX_MIN_VERSION=10.15
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OSX_SDK_VERSION=11.0
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XCODE_VERSION=12.2
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XCODE_BUILD_ID=12B45b
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LD64_VERSION=609
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OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-libcxx-headers
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darwin_native_binutils=native_cctools
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ifeq ($(strip $(FORCE_USE_SYSTEM_CLANG)),)
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# FORCE_USE_SYSTEM_CLANG is empty, so we use our depends-managed, pinned clang
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# from llvm.org
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# Clang is a dependency of native_cctools when FORCE_USE_SYSTEM_CLANG is empty
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darwin_native_toolchain=native_cctools
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clang_prog=$(build_prefix)/bin/clang
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clangxx_prog=$(clang_prog)++
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llvm_config_prog=$(build_prefix)/bin/llvm-config
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clang_resource_dir=$(build_prefix)/lib/clang/$(native_clang_version)
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else
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# FORCE_USE_SYSTEM_CLANG is non-empty, so we use the clang from the user's
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# system
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darwin_native_toolchain=
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# We can't just use $(shell command -v clang) because GNU Make handles builtins
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# in a special way and doesn't know that `command` is a POSIX-standard builtin
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# prior to 1af314465e5dfe3e8baa839a32a72e83c04f26ef, first released in v4.2.90.
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# At the time of writing, GNU Make v4.2.1 is still being used in supported
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# distro releases.
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#
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# Source: https://lists.gnu.org/archive/html/bug-make/2017-11/msg00017.html
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clang_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang")
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clangxx_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang++")
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llvm_config_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-config")
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clang_resource_dir=$(shell clang -print-resource-dir)
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llvm_lib_dir=$(shell $(llvm_config_prog) --libdir)
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endif
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cctools_TOOLS=AR RANLIB STRIP NM LIBTOOL OTOOL INSTALL_NAME_TOOL
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# Make-only lowercase function
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lc = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))
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# For well-known tools provided by cctools, make sure that their well-known
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# variable is set to the full path of the tool, just like how AC_PATH_{TOO,PROG}
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# would.
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$(foreach TOOL,$(cctools_TOOLS),$(eval darwin_$(TOOL) = $$(build_prefix)/bin/$$(host)-$(call lc,$(TOOL))))
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# Flag explanations:
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#
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# -mlinker-version
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#
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# Ensures that modern linker features are enabled. See here for more
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# details: https://github.com/bitcoin/bitcoin/pull/19407.
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#
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# -B$(build_prefix)/bin
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#
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# Explicitly point to our binaries (e.g. cctools) so that they are
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# ensured to be found and preferred over other possibilities.
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#
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# -stdlib=libc++ -stdlib++-isystem$(OSX_SDK)/usr/include/c++/v1
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#
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# Forces clang to use the libc++ headers from our SDK and completely
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# forget about the libc++ headers from the standard directories
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#
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# -Xclang -*system<path_a> \
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# -Xclang -*system<path_b> \
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# -Xclang -*system<path_c> ...
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#
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# Adds path_a, path_b, and path_c to the bottom of clang's list of
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# include search paths. This is used to explicitly specify the list of
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# system include search paths and its ordering, rather than rely on
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# clang's autodetection routine. This routine has been shown to:
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# 1. Fail to pickup libc++ headers in $SYSROOT/usr/include/c++/v1
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# when clang was built manually (see: https://github.com/bitcoin/bitcoin/pull/17919#issuecomment-656785034)
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# 2. Fail to pickup C headers in $SYSROOT/usr/include when
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# C_INCLUDE_DIRS was specified at configure time (see: https://gist.github.com/dongcarl/5cdc6990b7599e8a5bf6d2a9c70e82f9)
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#
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# Talking directly to cc1 with -Xclang here grants us access to specify
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# more granular categories for these system include search paths, and we
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# can use the correct categories that these search paths would have been
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# placed in if the autodetection routine had worked correctly. (see:
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# https://gist.github.com/dongcarl/5cdc6990b7599e8a5bf6d2a9c70e82f9#the-treatment)
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#
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# Furthermore, it places these search paths after any "non-Xclang"
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# specified search paths. This prevents any additional clang options or
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# environment variables from coming after or in between these system
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# include search paths, as that would be wrong in general but would also
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# break #include_next's.
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#
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darwin_CC=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
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-u OBJC_INCLUDE_PATH -u OBJCPLUS_INCLUDE_PATH -u CPATH \
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-u LIBRARY_PATH \
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$(clang_prog) --target=$(host) -mmacosx-version-min=$(OSX_MIN_VERSION) \
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-B$(build_prefix)/bin -mlinker-version=$(LD64_VERSION) \
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-isysroot$(OSX_SDK) \
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-Xclang -internal-externc-isystem$(clang_resource_dir)/include \
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-Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
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darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
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-u OBJC_INCLUDE_PATH -u OBJCPLUS_INCLUDE_PATH -u CPATH \
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-u LIBRARY_PATH \
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$(clangxx_prog) --target=$(host) -mmacosx-version-min=$(OSX_MIN_VERSION) \
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-B$(build_prefix)/bin -mlinker-version=$(LD64_VERSION) \
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-isysroot$(OSX_SDK) \
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-stdlib=libc++ \
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-stdlib++-isystem$(OSX_SDK)/usr/include/c++/v1 \
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-Xclang -internal-externc-isystem$(clang_resource_dir)/include \
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-Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
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darwin_CFLAGS=-pipe
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ifneq ($(LTO),)
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darwin_CFLAGS += -flto
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darwin_LDFLAGS += -flto
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endif
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darwin_CXXFLAGS=$(darwin_CFLAGS)
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darwin_release_CFLAGS=-O2
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darwin_release_CXXFLAGS=$(darwin_release_CFLAGS)
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darwin_debug_CFLAGS=-O1
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darwin_debug_CXXFLAGS=$(darwin_debug_CFLAGS)
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darwin_cmake_system=Darwin
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