Fails to build on musl

[JustSoup312]

It seems that there are a few glibc-specific libc calls implemented.

Log

  = note: /usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/user/Devel/nsncd/target/release/deps/nsncd-e51f93b659ebb890.nsncd.19fcab8b709a5c22-cgu.00.rcgu.o: in function `nsncd::handlers::InNetGroup::lookup':
          nsncd.19fcab8b709a5c22-cgu.00:(.text._ZN5nsncd8handlers10InNetGroup6lookup17hc987e22b53938113E+0x339): undefined reference to `innetgr'
          /usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/user/Devel/nsncd/target/release/deps/nsncd-e51f93b659ebb890.nsncd.19fcab8b709a5c22-cgu.00.rcgu.o: in function `nsncd::handlers::NetgroupWithName::lookup':
          nsncd.19fcab8b709a5c22-cgu.00:(.text._ZN5nsncd8handlers16NetgroupWithName6lookup17h08c7c930071b306aE+0x165): undefined reference to `setnetgrent'
          /usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: nsncd.19fcab8b709a5c22-cgu.00:(.text._ZN5nsncd8handlers16NetgroupWithName6lookup17h08c7c930071b306aE+0x21e): undefined reference to `getnetgrent_r'
          /usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: nsncd.19fcab8b709a5c22-cgu.00:(.text._ZN5nsncd8handlers16NetgroupWithName6lookup17h08c7c930071b306aE+0x67f): undefined reference to `endnetgrent'
          collect2: error: ld returned 1 exit status

[geofft]

Hm. As discussed in #70, because musl doesn't implement a loadable NSS mechanism, it's not clear there's a use case for using nsncd on a musl system - you'll just get the same behavior as the in-process musl would have run. Because musl implements an NSCD protocol client, it's meaningful to use a musl-linked binary against a glibc-linked nsncd. (#70 was ultimately resolved for the use case of building against a glibc that had its own internal NSCD support configured out.)

I think we could arrange to do something to skip the netgroup functions, but can you expand on your use case for building this on musl?

Alternatively, should musl implement the netgroup functions? They're not in POSIX but they're in Solaris and the BSDs in addition to glibc. Even if they were implemented as never returning anything, that would fix the build on musl.

[JustSoup312]

Ah, the person who pointed me to this repo misunderstood the purpose of the software. If there would be no change on musl then I don't see a reason to push for supporting it. Thank you for your response though!