sigtimedwait not supported in the Termux headers (supported on devices since api 23)

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From @abijahm on March 28, 2017 15:26

am trying to compile nimlang on android i get an error

undefined reference to sigtimedwait

Copied from original issue: termux/termux-app#288

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From @MeinFuehrer on March 28, 2017 22:31

Were you following these instructions?

http://stisa.space/articles/compile-nim-on-android/

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From @abijahm on March 29, 2017 5:35

yah i followed the instruction they solve the issue with glob.h it seems that the function sigtimedwait is not in the signal.h included in termux , could you have the solution to this

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From @MeinFuehrer on March 29, 2017 15:2

Those instructions are out of sync in two respects, namely, aarch64 is already a supported target and it's not reveant anyway as we're trying to compile for armhf.

Might be a good idea posting a build log in the Nim forum.

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sigtimedwait is in the unified headers, marked as supported from api level 23.

[MineFuehrer]

I believe the issue has already found a satisfactory fix on the Nim side.

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@MineFuehrer Great! I'll keep this open issue until sigtimedwait has been fixed.

[MineFuehrer]

You mean a different approach from nim-lang/Nim#5646 ?

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Right - that workaround should work, but a proper solution here would mean that no workaround is needed! For that the plan is:

1. Wait for NDK r15, which hopefully should have ironed out the issues with unified headers.
2. Switch to providing the unified headers in Termux.

We will then have sigtimedwait (and another couple of missing functions) in the headers and libc.

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I'm closing this now, as Termux has switched to the unified headers.

By default the C compiler in Termux targets API level 21, so sigtimedwait is not exposed by signal.h. By compiling with -D__ANDROID_API__=23 this function is exposed.