Option '--build=i686-pc-linux-gnu' is not recognized

[cnd]

Hello.

Trying to make gentoo package (ebuild) : https://github.com/Cynede/weirdo/commit/0da807cd916aa0ea363d91ca94dd91a8cb4e204b

default configure is failing with below error message:

configure: processing /var/tmp/portage/dev-lang/rust-9999/work/rust-9999/configure args
configure:
configure: CFG_PREFIX := /usr
configure: CFG_LOCAL_RUST_ROOT := /usr/local
configure: CFG_LLVM_ROOT :=
configure: CFG_HOST_TRIPLE := i686-unknown-linux-gnu
configure: CFG_TARGET_TRIPLES := i686-unknown-linux-gnu
configure:
configure: validating /var/tmp/portage/dev-lang/rust-9999/work/rust-9999/configure args
configure:
configure: error: Option '--build=i686-pc-linux-gnu' is not recognized

What is it? What option should I pass to configure?

[catamorphism]

Paging @pcwalton or @brson

[brson]

It looks like ebuild is calling our configure script with --build=i686-pc-linux-gnu and, because configure doesn't accept a --build flag, is emitting an error. Some cursory googling does not reveal to me why ebuild does this or how to prevent it.

[brson]

FWIW, the equivalent in our script is probably --host-triple, though after #4513 it will be --build-triple. Additionally, I have never built rust using i686-pc-linux-gnu as a triple (we use i686-unknown-linux-gnu), so it may not work.

[cnd]

I see, solved. Though it was even my fault.