Taken from Google GN repo's tools/gn/example, and fixed the original's bug of being broken on Mac.
Tested on Mac and Linux, x64.
Execute:
./run.sh
./run.sh -i # incremental re-build (try modifying some files)If everything runs fine, three Hello world will be printed, followed by a tree graph of files.
- macOS or Linux
- Python 2.7 or Python 3
- Clang and Clang++ compilers (to use GCC compilers, replace
clangwithgcc, andclang++withg++in all files)
1. Look for ".gn" file (see "gn help dotfile") in the current directory and
walk up the directory tree until one is found. Set this directory to be
the "source root" and interpret this file to find the name of the build
config file.
2. Execute the build config file identified by .gn to set up the global
variables and default toolchain name. Any arguments, variables, defaults,
etc. set up in this file will be visible to all files in the build.
3. Load the //BUILD.gn (in the source root directory).
4. Recursively evaluate rules and load BUILD.gn in other directories as
necessary to resolve dependencies. If a BUILD file isn't found in the
specified location, GN will look in the corresponding location inside
the secondary_source defined in the dotfile (see "gn help dotfile").
5. When a target's dependencies are resolved, write out the `.ninja`
file to disk.
6. When all targets are resolved, write out the root build.ninja file.