[swift-corelibs-dev] Unable to build swift master branch

Mohit Athwani mohit.athwani at gmail.com
Thu Mar 30 14:31:35 CDT 2017

I'm trying to get back to work starting from scratch on Swift Foundation on
my Ubuntu 16.04 LTS system.

I cloned the main swift repo and all of it's dependencies via ssh

./swift/utils/update-checkout --clone-with-ssh

and after running (taken from instructions from the Foundation site):

swift/utils/build-script --xctest --foundation -t

I get the following error:

+ make build-tests
/bin/bash ../libtool  --tag=CC   --mode=link /home/mohit/Documents/swift-
source/build/Ninja-DebugAssert/llvm-linux-x86_64/bin/clang -Wall
-Wno-deprecated-declarations  -fblocks -I/home/mohit/Documents/swift-
source/swift-corelibs-libdispatch/src/BlocksRuntime -isystem
/usr/include/bsd -DLIBBSD_OVERLAY   -g -O0 -rpath
-o dispatch_apply dispatch_apply.o libbsdtests.la ../src/libdispatch.la
-lbsd -L/home/mohit/Documents/swift-source/build/Ninja-
DebugAssert/swift-linux-x86_64/lib/swift/linux/x86_64 -lswiftCore
-lswiftSwiftOnoneSupport -lpthread
libtool: link: /home/mohit/Documents/swift-source/build/Ninja-
DebugAssert/llvm-linux-x86_64/bin/clang -Wall -Wno-deprecated-declarations
-fblocks -I/home/mohit/Documents/swift-source/swift-corelibs-libdispatch/src/BlocksRuntime
-isystem /usr/include/bsd -DLIBBSD_OVERLAY -g -O0 -o .libs/dispatch_apply
dispatch_apply.o  ./.libs/libbsdtests.a ../src/.libs/libdispatch.so -lbsd
DebugAssert/swift-linux-x86_64/lib/swift/linux/x86_64 -lswiftCore
-lswiftSwiftOnoneSupport -lpthread -Wl,-rpath -Wl,//usr/lib/swift/linux
-Wl,-rpath -Wl,/home/mohit/Documents/swift-source/build/Ninja-
64/lib/swift/linux/x86_64/libswiftCore.so: undefined reference to
clang-4.0: error: linker command failed with exit code 1 (use -v to see
Makefile:1123: recipe for target 'dispatch_apply' failed
make: *** [dispatch_apply] Error 1
swift/utils/build-script: fatal error: command terminated with a non-zero
exit status 2, aborting

Looks like there is some undefined reference for objc_release in

>From the looks of the message it looks like swift was actually built but
it's just that test cases weren't built. On this hunch, I went into my
swift-corelibs-foundation folder and tried to execute:


Which tells me:

ninja: error: loading 'build.ninja': No such file or directory

Given my lack of experience here, I'm not quite sure how to go about
resolving these issues.

Could somebody help me out here please.


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