serde_derive fails to compile as part of cargo build

[djc]

I'm trying to update the Gentoo Linux packages for cargo to 0.18.0, and am running into trouble with the compile process exiting with the error that serde_derive cannot be compiled:

error: the `#[proc_macro_derive]` attribute is only usable with crates of the `proc-macro` crate type
  --> /var/tmp/portage/dev-util/cargo-0.18.0/work/cargo_home/gentoo/serde_derive-0.9.12/src/lib.rs:24:3
   |
24 | #[proc_macro_derive(Serialize, attributes(serde))]
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Here's the configure output for starters:

enrai cargo-0.18.0 # ./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=x86_64-unknown-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --docdir=/usr/share/doc/cargo-0.18.0 --libdir=/usr/lib64 --host=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --cargo=/var/tmp/portage/dev-util/cargo-0.18.0/work/cargo-0.18.0/target/snapshot/bin/cargo --enable-optimize --disable-verify-install --disable-debug --disable-cross-tests --help
configure: looking for configure programs
configure: found cmp
configure: found mkdir
configure: found printf
configure: found cut
configure: found head
configure: found grep
configure: found xargs
configure: found cp
configure: found find
configure: found uname
configure: found date
configure: found tr
configure: found sed
configure: found cmake
configure: found make
configure: recreating config.tmp
configure: 
configure: processing ./configure args
configure: 
configure: CFG_DISABLE_DEBUG    := 1 
configure: CFG_DISABLE_VERIFY_INSTALL := 1 
configure: CFG_DISABLE_CROSS_TESTS := 1 
configure: CFG_PREFIX           := /usr 
configure: CFG_LOCAL_RUST_ROOT  :=  
configure: CFG_CARGO            := /var/tmp/portage/dev-util/cargo-0.1 ...
configure: CFG_RUSTC            := rustc 
configure: CFG_RUSTDOC          := rustdoc 
configure: CFG_CARGO            := /var/tmp/portage/dev-util/cargo-0.1 ...
configure: CFG_RUSTC            := /usr/bin/rustc (1.16.0)
configure: CFG_RUSTDOC          := /usr/bin/rustdoc (1.16.0)
configure: CFG_BUILD            := x86_64-unknown-linux-gnu 
configure: CFG_HOST             := x86_64-unknown-linux-gnu 
configure: CFG_TARGET           := x86_64-unknown-linux-gnu 
configure: CFG_LOCALSTATEDIR    := /var/lib 
configure: CFG_SYSCONFDIR       := /etc 
configure: CFG_DATADIR          := /usr/share 
configure: CFG_INFODIR          := /usr/share/info 
configure: CFG_DOCDIR           := /usr/share/doc/cargo-0.18.0 
configure: CFG_MANDIR           := /usr/share/man 
configure: CFG_LIBDIR           := /usr/lib64 
configure: git: no git directory. Changing default release channel to stable
configure: CFG_RELEASE_CHANNEL  := stable 
configure: 
configure: validating ./configure args
configure: 

No more help available for Configure options,
check the Wiki or join our IRC channel
configure: 
configure: looking for build programs
configure: 
configure: CFG_CC               := /usr/bin/cc (4.9.4)
configure: GIT                  := /usr/bin/git (2.10.2)
configure: 
configure: writing configuration
configure: 
configure: CFG_SRC_DIR          := /var/tmp/portage/dev-util/cargo-0.1 ...
configure: CFG_BUILD_DIR        := /var/tmp/portage/dev-util/cargo-0.1 ...
configure: CFG_CONFIGURE_ARGS   := --prefix=/usr --build=x86_64-pc-lin ...
configure: CFG_PREFIX           := /usr 
configure: CFG_BUILD            := x86_64-unknown-linux-gnu 
configure: CFG_HOST             := x86_64-unknown-linux-gnu 
configure: CFG_TARGET           := x86_64-unknown-linux-gnu 
configure: CFG_DATADIR          := /share 
configure: CFG_DOCDIR           := /share/doc/cargo-0.18.0 
configure: CFG_INFODIR          := /share/info 
configure: CFG_MANDIR           := /share/man 
configure: CFG_LIBDIR           := /lib64 
configure: CFG_RUSTC            := /usr/bin/rustc 
configure: CFG_RUSTDOC          := /usr/bin/rustdoc 
configure: CFG_CARGO            := /var/tmp/portage/dev-util/cargo-0.1 ...
configure: CFG_GIT              :=  
configure: 
configure: leaving ./Makefile unchanged
configure: mv config.tmp config.mk
configure: 
configure: complete
configure: 
configure: 

rustc is 1.16.0. It is pulling in cargo-0.17.0 for bootstrapping.

[MingcongBai]

Same here, using Rust 1.17.0 and Cargo 0.16.0.

[alexcrichton]

I just compiled the 0.18.0 tag with the 1.{15,16,17}.0 official releases. Is this a local configuration problem?

[djc]

I don't know how it could be. I definitely have modern Cargo installed both in the packaging setup and in the system at large. What kinds of configuration problem do you think could cause this?

[alexcrichton]

Can you try reproducing with a more minimal test case? E.g. get a precise command of cargo that fails to work? That will inform us precisely which cargo and rustc are actually being used here.

[MingcongBai]

In my case it's /usr/bin/cargo or the one built and installed to the system myself.

[carols10cents]

Closing due to inactivity and inability to reproduce. Please reopen with the output of rustc --version, cargo --version, and a cargo command that reproduces the problem if this is still an issue! Thanks!!