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ee6b7d66f1
4fe5f3c4675263ea106e7ac6d336ec769392ebc3 depends: remove redundant stdlib option (Cory Fields) Pull request description: Like #27628, this is another dependency of #21778, though it doesn't become obvious until used with a newer clang. This should be a no-op. Use of -stdlib++-isystem gets rid of any system c++ header include paths and negates the need for this option. In newer versions of clangs the combo produces an annoying warning that actually causes problems during configure. ACKs for top commit: fanquake: ACK 4fe5f3c4675263ea106e7ac6d336ec769392ebc3 Tree-SHA512: 904072f2b13dffbbeab2bc9ff20a74969888502fa1ea35d9030784dd397c6751e31233e6ec7dc34e9fd42574950be733b25d6653c2a93e214cc5e4eef2e0133a
130 lines
5.6 KiB
Makefile
130 lines
5.6 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$(build_prefix)/bin
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#
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# Explicitly point to our binaries (e.g. cctools) so that they are
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# ensured to be found and preferred over other possibilities.
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#
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# -stdlib++-isystem$(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$(OSX_SDK) \
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-stdlib++-isystem$(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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