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depends: Pin clang search paths for darwin host

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This commit is contained in:
Carl Dong
2020-08-06 11:51:55 -04:00
parent 107f33d434
commit 3007339218
1 changed files with 52 additions and 3 deletions
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55
depends/hosts/darwin.mk
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@@ -6,6 +6,12 @@ LD64_VERSION=530
OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-libcxx-headers
ifeq ($(strip $(FORCE_USE_SYSTEM_CLANG)),)
clang_resource_dir=$(build_prefix)/lib/clang/$(native_cctools_clang_version)
else
clang_resource_dir=$(shell clang -print-resource-dir)
endif
# Flag explanations:
#
# -mlinker-version
@@ -18,7 +24,7 @@ OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-
# Explicitly point to our binaries (e.g. cctools) so that they are
# ensured to be found and preferred over other possibilities.
#
# -nostdinc++ -isystem $(OSX_SDK)/usr/include/c++/v1
# -stdlib=libc++ -nostdinc++ -Xclang -cxx-isystem$(OSX_SDK)/usr/include/c++/v1
#
# Forces clang to use the libc++ headers from our SDK and completely
# forget about the libc++ headers from the standard directories
@@ -28,8 +34,51 @@ OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-
# https://reviews.llvm.org/D64089, we should use that instead. Read the
# differential summary there for more details.
#
darwin_CC=clang -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -mlinker-version=$(LD64_VERSION) -B$(build_prefix)/bin
darwin_CXX=clang++ -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -stdlib=libc++ -mlinker-version=$(LD64_VERSION) -B$(build_prefix)/bin -nostdinc++ -isystem $(OSX_SDK)/usr/include/c++/v1
# -Xclang -*system<path_a> \
# -Xclang -*system<path_b> \
# -Xclang -*system<path_c> ...
#
# Adds path_a, path_b, and path_c to the bottom of clang's list of
# include search paths. This is used to explicitly specify the list of
# system include search paths and its ordering, rather than rely on
# clang's autodetection routine. This routine has been shown to:
# 1. Fail to pickup libc++ headers in $SYSROOT/usr/include/c++/v1
# when clang was built manually (see: https://github.com/bitcoin/bitcoin/pull/17919#issuecomment-656785034)
# 2. Fail to pickup C headers in $SYSROOT/usr/include when
# C_INCLUDE_DIRS was specified at configure time (see: https://gist.github.com/dongcarl/5cdc6990b7599e8a5bf6d2a9c70e82f9)
#
# Talking directly to cc1 with -Xclang here grants us access to specify
# more granular categories for these system include search paths, and we
# can use the correct categories that these search paths would have been
# placed in if the autodetection routine had worked correctly. (see:
# https://gist.github.com/dongcarl/5cdc6990b7599e8a5bf6d2a9c70e82f9#the-treatment)
#
# Furthermore, it places these search paths after any "non-Xclang"
# specified search paths. This prevents any additional clang options or
# environment variables from coming after or in between these system
# include search paths, as that would be wrong in general but would also
# break #include_next's.
#
darwin_CC=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
-u OBJC_INCLUDE_PATH -u OBJCPLUS_INCLUDE_PATH -u CPATH \
-u LIBRARY_PATH \
clang --target=$(host) -mmacosx-version-min=$(OSX_MIN_VERSION) \
-B$(build_prefix)/bin -mlinker-version=$(LD64_VERSION) \
-fuse-ld=$(build_prefix)/bin/x86_64-apple-darwin16-ld \
--sysroot=$(OSX_SDK) \
-Xclang -internal-externc-isystem$(clang_resource_dir)/include \
-Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
-u OBJC_INCLUDE_PATH -u OBJCPLUS_INCLUDE_PATH -u CPATH \
-u LIBRARY_PATH \
clang++ --target=$(host) -mmacosx-version-min=$(OSX_MIN_VERSION) \
-B$(build_prefix)/bin -mlinker-version=$(LD64_VERSION) \
-fuse-ld=$(build_prefix)/bin/x86_64-apple-darwin16-ld \
--sysroot=$(OSX_SDK) \
-stdlib=libc++ -nostdinc++ \
-Xclang -cxx-isystem$(OSX_SDK)/usr/include/c++/v1 \
-Xclang -internal-externc-isystem$(clang_resource_dir)/include \
-Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
darwin_CFLAGS=-pipe
darwin_CXXFLAGS=$(darwin_CFLAGS)