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depends: Add justifications for macOS clang flags

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Carl Dong 2020-07-10 17:37:51 -04:00
parent 6b8e497eea
commit 60c55b1b9b
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1 changed files with 22 additions and 2 deletions
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24
depends/hosts/darwin.mk
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@ -6,8 +6,28 @@ LD64_VERSION=530
OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-libcxx-headers
# When cross-compiling for Darwin using Clang, -mlinker-version must be passed to
# ensure that modern linker features are enabled.
# Flag explanations:
#
# -mlinker-version
#
# Ensures that modern linker features are enabled. See here for more
# details: https://github.com/bitcoin/bitcoin/pull/19407.
#
# -B$(build_prefix)/bin
#
# 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
#
# Forces clang to use the libc++ headers from our SDK and completely
# forget about the libc++ headers from the standard directories
#
# TODO: Once we start requiring a clang version that has the
# -stdlib++-isystem<directory> flag first introduced here:
# 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