Ninja not found when building a cmake project (assumption that Ninja is already installed.)

[Diggory]

The code appears to assume that Ninja is already installed, which it won't be unless one is actively developing Swift itself.

...
http://gb.archive.ubuntu.com/ubuntu/pool/main/z/zlib/zlib1g_1.2.11.dfsg-2ubuntu9.2_amd64.deb – 2.2 MB
http://gb.archive.ubuntu.com/ubuntu/pool/main/z/zlib/zlib1g-dev_1.2.11.dfsg-2ubuntu9.2_amd64.deb – 11.6 MB

Unpacking and copying Swift binaries for the host triple...
8455394 blocks

Unpacking Swift distribution for the target triple...

Copying Swift core libraries for the target triple into Swift SDK bundle...

Unpacking and copying `lld` linker...
CMake Deprecation Warning at /private/var/folders/d6/2m5sz0rx573drxq0b25xttl80000gn/T/swift-sdk-generator-169E0B/cmake/Modules/CMakePolicy.cmake:6 (cmake_policy):
  The OLD behavior for policy CMP0114 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.
Call Stack (most recent call first):
  CMakeLists.txt:13 (include)

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: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_ASM_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
Error: nonZeroExitCode(1, SwiftSDKGenerator.CommandInfo(command: "PATH=\'/bin:/usr/bin:/usr/local/bin\' cmake -B build -G Ninja -S llvm -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=lld -DLLVM_TARGETS_TO_BUILD=X86", currentDirectory: Optional("/var/folders/d6/2m5sz0rx573drxq0b25xttl80000gn/T/swift-sdk-generator-169E0B"), file: "/Users/diggory/Code/OpenSource/swift-sdk-generator/Sources/SwiftSDKGenerator/Generator/LocalSwiftSDKGenerator.swift", line: 348))
diggory@MBP-16 swift-sdk-generator % 

[MaxDesiatov]

Would installing ninja from Homebrew work for you as a workaround in the meantime?

[Diggory]

Yes, no problem.