[CI] CI for i686-linux-android is broken

[JohnTitor]

Currently, aarch64-unknown-linux-android and i686-linux-android targets are broken.
The logs:

• aarch64-unknown-linux-android: it's now resolved but some it seems API version is old somehow.
• i686-linux-android

We should investigate the cause and land a fix.

[rupansh]

Consider using a newer toolchain for android.
Current CI uses API 21's toolchain. These functions were added in later versions of android to the TC.
According to headers in sysroot/usr/include of the latest ndk

API 23 Functions:
openpty, forkpty, login_tty, sethostname, sigtimedwait, fmemopen, open_memstream, open_wmemstream, clock_getcpuclockid

API 24 Functions:
lockf,preadv64,pwritev64, getifaddrs, freeifaddrs, getgrgid_r, getgrnam_r

[JohnTitor]

Current CI uses API 21's toolchain.

Hm, it's weird. IIUC we use API 24 for arm/aarch64 and API 28 for i686/x86_64, am I missing something?

[rupansh]

Current CI uses API 21's toolchain.

Hm, it's weird. IIUC we use API 24 for arm/aarch64 and API 28 for i686/x86_64, am I missing something?

Did you recently change the CI? It was using android21 with azure pipelines 12 days ago.

[JohnTitor]

No. Here's our config for Android NDK:

libc/ci/android-install-ndk.sh

Lines 5 to 34 in 2d044d9

	NDK=android-ndk-r21d
	wget --tries=20 https://dl.google.com/android/repository/${NDK}-linux-x86_64.zip
	unzip -q ${NDK}-linux-x86_64.zip
	case "$1" in
	arm)
	arch=arm
	api=24
	;;
	armv7)
	arch=arm
	api=24
	;;
	aarch64)
	arch=arm64
	api=24
	;;
	i686)
	arch=x86
	api=28
	;;
	x86_64)
	arch=x86_64
	api=28
	;;
	*)
	echo "invalid arch: $1"
	exit 1
	;;
	esac;

It was using android21 with azure pipelines 12 days ago.

You mean r21d is API 21?