[swift-users] Bootstrapping ninja and building from source

[Daniel Dunbar]

Hi Lane,

You shouldn't need to install re2c to build Ninja.

This looks like something is wrong in the build script. It did successfully build Ninja, but it isn't getting found by CMake for the mark build.

Can you open an SR for this on bugs.swift.org?

If you want to debug yourself, it looks like the PATH export at utils/build-script-impl:1287 isn't working, it should have let ninja be found for the rest of the commands.

 - Daniel

> On Dec 4, 2015, at 11:22 AM, Lane Schwartz <dowobeha at gmail.com> wrote:
> 
> Hi,
> 
> First of all, congratulations on the open source release! I'm very excited!
> 
> Second, I'm running into trouble building from source, particularly in regards to getting ninja bootstrapped. I'm on Scientific Linux. I first used yum to install packages for llvm, llvm-devel, clang, and cmake.
> 
> I then did the following, following the README.md in the swift git repo: 
> 
>  git clone git at github.com:apple/swift.git swift
>  git clone git at github.com:apple/swift-llvm.git llvm
>  git clone git at github.com:apple/swift-clang.git clang
>  git clone git at github.com:apple/swift-lldb.git lldb
>  git clone git at github.com:apple/swift-cmark.git cmark
>  git clone git at github.com:apple/swift-llbuild.git llbuild
>  git clone git at github.com:apple/swift-package-manager.git swiftpm
>  git clone git at github.com:apple/swift-corelibs-xctest.git
>  git clone git at github.com:apple/swift-corelibs-foundation.git
> 
> 
> The README.md also states:
> 
> Ninja is the current recommended build system for building Swift and is the default configuration generated by CMake. If you're on OS X or don't install it as part of your Linux distribution, clone it next to the other projects and it will be bootstrapped automatically
> 
>  My Linux distro doesn't package ninja, so I also did this:
> 
> git clone git at github.com:martine/ninja.git
> 
> I then attempted to build swift:
> 
> $ ./swift/utils/build-script
> 
> Which resulted in errors, and as far as I can tell did not attempt to build the ninja distro that I downloaded into the ninja directory in my current working directory:
> 
> which: no ninja in (/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/lanes/.local/bin:/home/lanes/bin)
> Building the standard library for: swift-stdlib-linux-x86_64
> Running Swift tests for: check-swift-linux-x86_64
> + rm -rf /home/lanes/swift/build/Ninja-DebugAssert/ninja-build
> + cp -r /home/lanes/swift/ninja /home/lanes/swift/build/Ninja-DebugAssert/ninja-build
> ++ uname -s
> + [[ Linux == \D\a\r\w\i\n ]]
> + cd /home/lanes/swift/build/Ninja-DebugAssert/ninja-build
> + python ./configure.py --bootstrap
> bootstrapping ninja...
> warning: A compatible version of re2c (>= 0.11.3) was not found; changes to src/*.in.cc will not affect your build.
> wrote build.ninja.
> bootstrap complete.  rebuilding...
> [24/24] LINK ninja
> cmark: using standard linker
> + cd /home/lanes/swift/build/Ninja-DebugAssert/cmark-linux-x86_64
> + /usr/bin/cmake -G Ninja -DCMAKE_C_COMPILER:PATH=clang -DCMAKE_CXX_COMPILER:PATH=clang++ -DCMAKE_BUILD_TYPE:STRING=Debug /home/lanes/swift/cmark
> CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
> CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
> Missing variable is:
> CMAKE_C_COMPILER_ENV_VAR
> CMake Error: Could not find cmake module file:/home/lanes/swift/build/Ninja-DebugAssert/cmark-linux-x86_64/CMakeFiles/2.8.11/CMakeCCompiler.cmake
> CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
> Missing variable is:
> CMAKE_CXX_COMPILER_ENV_VAR
> CMake Error: Could not find cmake module file:/home/lanes/swift/build/Ninja-DebugAssert/cmark-linux-x86_64/CMakeFiles/2.8.11/CMakeCXXCompiler.cmake
> -- Configuring incomplete, errors occurred!
> ./swift/utils/build-script: command terminated with a non-zero exit status 1, aborting
> 
> 
> This leads me to a couple of questions:
> 
> * Do I need to first build and install re2c? If so, this should perhaps be mentioned as a prereq.
> * Is there anything differently I should be doing to get the bootstrap process running successfully?
> 
> Thanks,
> Lane
> 
> 
> 
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