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[DOC] Caution about old GNU make

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Nobuyoshi Nakada 2024-06-02 19:00:32 +09:00
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doc/contributing/building_ruby.md
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@ -130,6 +130,9 @@ to run tests on 8 processes, use:
make test-all -j8 make test-all -j8
``` ```
**CAUTION**: GNU make 3 is missing some features for parallel execution, we
recommend to upgrade to GNU make 4 or later.
We can also set `MAKEFLAGS` to run _all_ `make` commands in parallel. We can also set `MAKEFLAGS` to run _all_ `make` commands in parallel.
Having the right `--jobs` flag will ensure all processors are utilized when building software projects. To do this effectively, you can set `MAKEFLAGS` in your shell configuration/profile: Having the right `--jobs` flag will ensure all processors are utilized when building software projects. To do this effectively, you can set `MAKEFLAGS` in your shell configuration/profile: