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Implement GNU Make 4.4+ jobserver fifo / semaphore client support #2450

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Implement GNU Make 4.4+ jobserver fifo / semaphore client support #2450

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Commits on Jun 17, 2024

  1. Implement GNU Make 4.4+ jobserver fifo / semaphore client support 

    The principle of such a job server is rather simple: Before starting a
new job (edge in ninja-speak), a token must be acquired from an external
entity. On posix systems, that entity is simply a fifo filled with N
characters. On win32 systems it is a semaphore initialized to N.  Once a
job is finished, the token must be returned to the external entity.

This functionality is desired when ninja is used as part of a bigger
build, such as builds with Yocto/OpenEmbedded, Buildroot and Android.
Here, multiple compile jobs are executed in parallel to maximize cpu
utilization, but if each compile job uses all available cores, the
system is over loaded.
    @hundeboll
    hundeboll committed Jun 17, 2024
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  2. jobserver: add unit tests 

    Implement proper testing of the MAKEFLAGS parsing, and the token
acquire/release logic in the jobserver class.
    @hundeboll
    hundeboll committed Jun 17, 2024
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    8223097 View commit details
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