tree 809e443cc61b7986e899e599a387316135a2df46
parent 889f5fd7ab5c1461ce823ee9a3e315627c8b3698
author Ryan Beasley <beasleyr@vmware.com> 1553861193 -0700
committer Jingwen Chen <jingwen@google.com> 1555018260 -0400

bazel/grpc: include linux/tcp.h on Linux pre-glibc 2.17

Bazel 0.24.0 upgraded grpc from 1.13.0 to 1.18.0, and the latter makes use of
the TCP_USER_TIMEOUT socket option.  Problem:  grpc conditions the option on
the Linux kernel version but sources the option from glibc's `netinet/tcp.h`.
glibc != Linux kernel, and that option wasn't imported to glibc until 2.17.

We can't just build Bazel with glibc 2.17 because we still have to support
CentOS 6 dev nodes which ship with glibc 2.12.  So instead this change
tweaks the grpc headers to conditionally include <linux/tcp.h> instead of
<netinet/tcp.h>.

Resolves https://github.com/bazelbuild/bazel/issues/7890.