This is the GNU C library as a Alpine Linux package to run binaries linked against glibc. This package utilizes a custom built glibc binary based on the vanilla glibc source. Built binary artifacts come from https://github.com/sgerrand/docker-glibc-builder.
See the releases page for the latest download links. If you are using tools like localdef you will need the glibc-bin and glibc-i18n packages in addition to the glibc package.
The current installation method for these packages is to pull them in using wget or curl and install the local file with apk:
apk --no-cache add ca-certificates
wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://raw.githubusercontent.com/sgerrand/alpine-pkg-glibc/master/sgerrand.rsa.pub
wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.25-r0/glibc-2.25-r0.apk
apk add glibc-2.25-r0.apk
You will need to generate your locale if you would like to use a specific one for your glibc application. You can do this by installing the glibc-i18n package and generating a locale using the localedef binary. An example for en_US.UTF-8 would be:
apk add glibc-bin-2.25-r0.apk glibc-i18n-2.25-r0.apk
/usr/glibc-compat/bin/localedef -i en_US -f UTF-8 en_US.UTF-8