Comment by Vladislav Dembskiy (JIRA)

Today I did fresh checkout and got the same error at another place

/mnt/swift/swift-source/swift/tools/SourceKit/lib/Support/Concurrency-libdispatch.cpp:20:10: fatal error: 'Block.h' file not found
#include <Block.h>

So I changed the issue subject to SourceKit

Comment by Vladislav Dembskiy (JIRA)

If I use the same workaround to create a symlink from compiler-rt/lib/BlocksRuntime/Block.h to /usr/Include then I this compilation set passed but later I have got another error

• • Build files have been written to: /mnt/swift/swift-source/build/buildbot_linux/swift-linux-x86_64
    • popd
      /mnt/swift/swift-source/swift
    • /usr/bin/cmake --build /mnt/swift/swift-source/build/buildbot_linux/swift-linux-x86_64 – -j4 all swift-stdlib-linux-x86_64
      [4/194] Linking CXX shared library lib/libsourcekitdInProc.so
      FAILED: lib/libsourcekitdInProc.so
      : && /usr/bin/clang++ -fPIC -fno-stack-protector -fPIC -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -Werror=date-time -std=c++11 -fcolor-diagnostics -ffunction-sections ...
      ...
      ... /mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib/libclangBasic.a /mnt/swift/swift-source/build/buildbot_linux/libdispatch-linux-x86_64/src/.libs/libdispatch.so && :
      /usr/bin/ld: cannot find -lBlocksRuntime
      /usr/bin/ld: cannot find -lBlocksRuntime
      /usr/bin/ld: cannot find -lBlocksRuntime
      clang-3.9: error: linker command failed with exit code 1 (use -v to see invocation)

It is strange that ld is called instead of ld.gold and why BlocksRuntime library have not been found

Comment by Vladislav Dembskiy (JIRA)

Small progress. Today after fresh checkout I have got similar error but produced by ld.gold:

[523/694] Linking CXX shared library lib/libsourcekitdInProc.so
FAILED: lib/libsourcekitdInProc.so
: && /usr/bin/clang++ -fPIC -fno-stack-protector -fPIC -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -Werror=date-time -std=c++11 -fcolor-diagnostics -ffunction-sections -fdata-sections -Wdocumentation -Wimplicit-fallthrough -Wunreachable-code -Woverloaded-virtual -O3 -target x86_64-unknown-linux-gnu -lpthread -latomic -ldl -fuse-ld=gold -lBlocksRuntime -shared -Wl,-soname,libsourcekitdInProc.so -o lib/libsourcekitdInProc.so tools/SourceKit/tools/sourcekitd/bin/InProc/CMakeFiles/sourcekitdInProc.dir/sourcekitdInProc.cpp.o -L/mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib -Wl,-rpath,/mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib:/mnt/swift/swift-source/build/buildbot_linux/libdispatch-linux-x86 ...
...
... linux/llvm-linux-x86_64/lib/libLLVMSupport.a -lrt -ldl -lcurses -lpthread -lz -lm /mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/lib/libLLVMDemangle.a /usr/lib/libuuid.so /mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib/libclangRewrite.a /mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib/libclangBasic.a /mnt/swift/swift-source/build/buildbot_linux/libdispatch-linux-x86_64/src/.libs/libdispatch.so && :
/usr/bin/ld.gold: error: cannot find -lBlocksRuntime
/usr/bin/ld.gold: error: cannot find -lBlocksRuntime
/usr/bin/ld.gold: error: cannot find -lBlocksRuntime
clang-3.9: error: linker command failed with exit code 1 (use -v to see invocation)

Comment by Vladislav Dembskiy (JIRA)

Today I did fresh checkout and run standard installation script:

utils/build-script --preset=buildbot_linux install_destdir=/mnt/swift/lfs installable_package=/mnt/swift/lfs/swift-lfs.tar.gz

First error I have got during swift compilation: "Block.h" not found. I did created the issue https://bugs.swift.org/browse/SR-3919 and use the following workaround:
Make symbolic link from swift-source/compiler-rt/lib/BlocksRuntime/Block.h to /usr/include
Then I have got another error during building sourcekit:

[36/218] Linking CXX shared library lib/libsourcekitdInProc.so
FAILED: lib/libsourcekitdInProc.so
: && /usr/bin/clang++ -fPIC -fno-stack-protector -fPIC -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -Werror=date-time -std=c++11 -fcolor-diagnostics -ffunction-sections -fdata-sections -Wdocumentation -Wimplicit-fallthrough -Wunreachable-code -Woverloaded-virtual -O3 -target x86_64-unknown-linux-gnu -lpthread -latomic -ldl -fuse-ld=gold -lBlocksRuntime -shared -Wl,-soname,libsourcekitdInProc.so -o lib/libsourcekitdInProc.so ....
....
... /usr/lib/libuuid.so /mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib/libclangRewrite.a /mnt/swift/swift-source/build/buildbot_linux/llvm-linux-x86_64/./lib/libclangBasic.a /mnt/swift/swift-source/build/buildbot_linux/libdispatch-linux-x86_64/src/.libs/libdispatch.so && :
/usr/bin/ld.gold: error: cannot find -lBlocksRuntime
/usr/bin/ld.gold: error: cannot find -lBlocksRuntime
/usr/bin/ld.gold: error: cannot find -lBlocksRuntime
clang-3.9: error: linker command failed with exit code 1 (use -v to see invocation)
[39/218] Building CXX object stdlib/public/runtime/CMakeFiles/swiftRuntime-linux-x86_64.dir/Demangle.cpp.o
ninja: build stopped: subcommand failed.

I have no idea about workaround. I believe that libBlocksRuntime should be created during compiler-rt compilation to be used in future steps. Not every Linux distribution includes libblocksruntime-dev. Neither Gentoo nor LFS/BLFS.

Comment by Vladislav Dembskiy (JIRA)

It is looks like nobody care about it

Comment by Ali Yousefi Sabzevar (JIRA)

I faced this problem when compiling swift-4.0-DEVELOPMENT-SNAPSHOT-2017-09-05-a on Fedora 26.
Will somebody help?

I believe this was fixed a while ago with building blocks runtime as part of dispatch and using that.