Hi,I in Centos 7.2 run "./swift/utils/build-script --preset=buildbot_linux
installable_package=/tmp/swift.tar.gz install_destdir=/tmp/swift-install"
gcc version:4.9.4
clang version:3.8.1
==============================================
+ /usr/local/src/swiftpm/Utilities/bootstrap
--swiftc=/usr/local/src/build/buildbot_linux/swift-linux-x86_64/bin/swiftc
--sbt=/usr/local/src/build/buildbot_linux/llbuild-linux-x86_64/bin/swift-build-tool
--build=/usr/local/src/build/buildbot_linux/swiftpm-linux-x86_64
--foundation=/usr/local/src/build/buildbot_linux/foundation-linux-x86_64/Foundation
--libdispatch-source-dir=/usr/local/src/swift-corelibs-libdispatch
--libdispatch-build-dir=/usr/local/src/build/buildbot_linux/libdispatch-linux-x86_64
--xctest=/usr/local/src/build/buildbot_linux/xctest-linux-x86_64
--- bootstrap: note: building stage1:
/usr/local/src/build/buildbot_linux/llbuild-linux-x86_64/bin/swift-build-tool
-f
/usr/local/src/build/buildbot_linux/swiftpm-linux-x86_64/.bootstrap/build.swift-build
--- bootstrap: note: building self-hosted 'swift-build': env
SWIFT_EXEC=/usr/local/src/build/buildbot_linux/swiftpm-linux-x86_64/debug/swiftc
SWIFT_BUILD_PATH=/usr/local/src/build/buildbot_linux/swiftpm-linux-x86_64
/usr/local/src/build/buildbot_linux/swiftpm-linux-x86_64/debug/swift-build-stage1
-Xlinker -rpath -Xlinker $ORIGIN/../lib/swift/linux -Xlinker -L -Xlinker
/usr/local/src/build/buildbot_linux/foundation-linux-x86_64/Foundation -Xlinker
-rpath -Xlinker
/usr/local/src/build/buildbot_linux/foundation-linux-x86_64/Foundation -Xswiftc
-I/usr/local/src/build/buildbot_linux/foundation-linux-x86_64/Foundation
-Xswiftc
-I/usr/local/src/build/buildbot_linux/foundation-linux-x86_64/Foundation/usr/lib/swift
-Xlinker -L -Xlinker /usr/local/src/build/buildbot_linux/xctest-linux-x86_64
-Xlinker -rpath -Xlinker
/usr/local/src/build/buildbot_linux/xctest-linux-x86_64 -Xswiftc
-I/usr/local/src/build/buildbot_linux/xctest-linux-x86_64 -Xswiftc
-I/usr/local/src/build/buildbot_linux/libdispatch-linux-x86_64/src -Xswiftc
-I/usr/local/src/swift-corelibs-libdispatch -Xcc -fblocks --build-tests
error: invalid inferred toolchain
--- bootstrap: error: build failed with exit status 1
./swift/utils/build-script: fatal error: command terminated with a non-zero
exit status 1, aborting
./swift/utils/build-script: fatal error: command terminated with a non-zero
exit status 1, aborting
==============================================
Source compiler this error, how to solve?
Thank!
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