Redeclaration of fs_type_t on musl + s390x

[ptrcnull]

On a musl-based system running on s390x both of these lines are applicable:

#[cfg(all(target_os = "linux", target_arch = "s390x"))]
type fs_type_t = libc::c_uint;
#[cfg(all(target_os = "linux", target_env = "musl"))]
type fs_type_t = libc::c_ulong;

As such, trying to compile anything returns an error:

error[E0428]: the name `fs_type_t` is defined multiple times
  --> /home/buildozer/.cargo/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.26.1/src/sys/statfs.rs:68:1
   |
66 | type fs_type_t = libc::c_uint;
   | ------------------------------ previous definition of the type `fs_type_t` here
67 | #[cfg(all(target_os = "linux", target_env = "musl"))]
68 | type fs_type_t = libc::c_ulong;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `fs_type_t` redefined here
   |
   = note: `fs_type_t` must be defined only once in the type namespace of this module

[ptrcnull]

Same issue occurs with optimal_transfer_size and maximum_name_length

[nekopsykose]

this is addressed by #1835

[nekopsykose]

(see the last comment in particular- there are equivalent changes to make to libc first)

[williamdes]

Here is my build log on s390x while compiling rustpython: https://github.com/sudo-bot/docker-rustpython/actions/runs/4242719422/jobs/7374576275#step:5:615

#22 1769.0 error[E0428]: the name `fs_type_t` is defined multiple times
#22 1769.0   --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/sys/statfs.rs:33:1
#22 1769.0    |
#22 1769.0 31 | type fs_type_t = libc::c_uint;
#22 1769.0    | ------------------------------ previous definition of the type `fs_type_t` here
#22 1769.0 32 | #[cfg(all(target_os = "linux", target_env = "musl"))]
#22 1769.0 33 | type fs_type_t = libc::c_ulong;
#22 1769.0    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `fs_type_t` redefined here
#22 1769.0    |
#22 1769.0    = note: `fs_type_t` must be defined only once in the type namespace of this module
#22 1769.0 
#22 1772.7 error[E0425]: cannot find value `O_LARGEFILE` in crate `libc`
#22 1772.7    --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/fcntl.rs:121:9
#22 1772.7     |
#22 1772.7 121 |         O_LARGEFILE;
#22 1772.7     |         ^^^^^^^^^^^ not found in `libc`
#22 1772.7 
#22 1772.7 error[E0412]: cannot find type `ucontext_t` in crate `libc`
#22 1772.7   --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/ucontext.rs:11:20
#22 1772.7    |
#22 1772.7 11 |     context: libc::ucontext_t,
#22 1772.7    |                    ^^^^^^^^^^ not found in `libc`
#22 1772.7 
#22 1777.9 error[E0592]: duplicate definitions with name `optimal_transfer_size`
#22 1777.9    --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/sys/statfs.rs:258:5
#22 1777.9     |
#22 1777.9 248 |     pub fn optimal_transfer_size(&self) -> u32 {
#22 1777.9     |     ------------------------------------------ other definition for `optimal_transfer_size`
#22 1777.9 ...
#22 1777.9 258 |     pub fn optimal_transfer_size(&self) -> libc::c_ulong {
#22 1777.9     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ duplicate definitions for `optimal_transfer_size`
#22 1777.9 
#22 1777.9 error[E0592]: duplicate definitions with name `block_size`
#22 1777.9    --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/sys/statfs.rs:309:5
#22 1777.9     |
#22 1777.9 301 |     pub fn block_size(&self) -> u32 {
#22 1777.9     |     ------------------------------- other definition for `block_size`
#22 1777.9 ...
#22 1777.9 309 |     pub fn block_size(&self) -> libc::c_ulong {
#22 1777.9     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ duplicate definitions for `block_size`
#22 1777.9 
#22 1777.9 error[E0592]: duplicate definitions with name `maximum_name_length`
#22 1777.9    --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/sys/statfs.rs:367:5
#22 1777.9     |
#22 1777.9 360 |     pub fn maximum_name_length(&self) -> u32 {
#22 1777.9     |     ---------------------------------------- other definition for `maximum_name_length`
#22 1777.9 ...
#22 1777.9 367 |     pub fn maximum_name_length(&self) -> libc::c_ulong {
#22 1777.9     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ duplicate definitions for `maximum_name_length`
#22 1777.9 
#22 1777.9 Some errors have detailed explanations: E0412, E0425, E0428, E0592.
#22 1777.9 For more information about an error, try `rustc --explain E0412`.
#22 1778.0 error: could not compile `nix` due to 6 previous errors
#22 1778.0 warning: build failed, waiting for other jobs to finish...
#22 ERROR: process "/bin/sh -c cargo build --features freeze-stdlib --release --locked --offline --bin rustpython" did not complete successfully: exit code: 101
------
 > [builder 13/13] RUN cargo build --features freeze-stdlib --release --locked --offline --bin rustpython:
#22 1772.7 error[E0412]: cannot find type `ucontext_t` in crate `libc`
#22 1772.7   --> /workdir/registry/src/github.com-eae4ba8cbf2ce1c7/nix-0.24.2/src/ucontext.rs:11:20
#22 1772.7    |
#22 1772.7 11 |     context: libc::ucontext_t,
#22 1772.7    |                    ^^^^^^^^^^ not found in `libc`
#22 1772.7 

[SteveLauC]

Close as completed in #1835