Build and link can run parallel?

[MaxwellGengYF]

Is your feature request related to a problem? Please describe.

目前compile与link阶段，似乎有一层全局同步，即使数个target互相无依赖也会有这样的情况。在单个compile目标足够大，以及单个link耗时长的情况下，会有严重的气泡，降低性能。

Describe the solution you'd like

无依赖的target可以并行执行link和compile。

Describe alternatives you've considered

No response

Additional context

No response

[waruqi]

内部没有全局同步，相互无依赖就会并行构建。你可以提供下可以复现的 project example.

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

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There is no global synchronization internally, and they will be built in parallel without dependencies on each other. You can provide a reproducible project example.

[MaxwellGengYF]

https://github.com/MaxwellGengYF/XMake-parallel-test.git

[waruqi]

看了下，大概知道了原因，是 runjobs 里面调度策略有问题，不过需要点时间来改进

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

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After looking at it, I probably know the reason. There is a problem with the scheduling strategy in runjobs, but it will take some time to improve.

[waruqi]

应该可以了，runjobs 里面的调度算法我改进过了，再试试 #4947

xmake update -s github:xmake-io/xmake#runjobs