build: drop unused feature-detection code for Apple poll()
#14718
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Drop Apple-specific detection logic for `poll()`. This detection snippet has been disabled for Apple in both configure and cmake, for `poll()` being broken on Apple since 10.12 Sierra (2016). Also replace `exit(1);` with `return 1;` in configure, to make the snippets match.
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poll()
bagder
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Also: - cmake: delete unnecessary `#include <sys/time.h>` from non-cross-build `poll()` detection snippet. Follow-up tp cc8b813 curl#14718 Fixes curl#14714
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For cross-builds rely on `_POSIX_C_SOURCE` to decide if `poll()` is supported, rather than just assuming it isn't. This may still miss to detect `poll()` support, as seen for example with Linux MUSL cross-builds. Also: - GHA/curl-for-win: enable RISC-V 64 cross-target for Linux MUSL. (to test this case with cmake, with a false-negative.) The first RISC-V 64 build in curl's CI. - GHA/curl-for-win: add arm64/intel64 job for Linux glibc. (to test this case with cmake, and succeed.) - cmake: delete unnecessary `#include <sys/time.h>` from non-cross-build `poll()` detection snippet. Follow-up tp cc8b813 #14718 Fixes #14714 Closes #14734
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Drop Apple-specific detection logic for
poll(). This detection snippethas been disabled for Apple in both configure and cmake, for
poll()being broken on Apple since 10.12 Sierra (2016).
Also replace
exit(1);withreturn 1;in configure, to make thesnippets match.
Added in 9297ca4 #1057 (2016-10-11).
Disabled for:
configure/darwin in a34c7ce (2016-10-18)
cmake/macOS in 825911b #7619
cmake/iOS in d148312 #8244
cmake/all Apple in a86254b #12515