HAVE_POLL_FINE is always false when cross-compiling for Android

[vvb2060]

I did this

./configure

I expected the following

#define HAVE_POLL_FINE 1

curl/libcurl version

curl 8.10.1

operating system

Android

[vvb2060]

#14734

[dfandrich]

Are you using autoconf or cmake? If the former, can you show the snippet of config.log around this check?

[vvb2060]

@vszakats _POSIX_C_SOURCE has been deleted in https://r.android.com/237770/6/libc/include/sys/cdefs.h#219 : With bionic, you always get all C and POSIX API.

[vszakats]

At compile-time, how do we detect Bionic and this version of Bionic where fine poll is unconditionally available?

[vvb2060]

https://android.googlesource.com/platform/bionic/+/main/docs/defines.md
I think only Apple's poll is broken? No need to test on other platforms

[vszakats]

Are you sure that enabling this unconditionally for all platforms (except Apple) is the correct way to go? There are a lot of platforms out there.

[bagder]

I propose #15037