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From: "aldot at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/107739] New: --enable-languages= duplicates yield odd
 error
Date: Thu, 17 Nov 2022 20:17:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107739

            Bug ID: 107739
           Summary: --enable-languages=3D duplicates yield odd error
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aldot at gcc dot gnu.org
  Target Milestone: ---

Mere cosmetics, but the error is contradicting it's own hint in a confusing
way.

$ ../../src/gcc-13.mine/configure --enable-languages=3Dc++,lto,lto
configure: error:=20
The following requested languages could not be built: lto
Supported languages are: c,c,c++,fortran,go,lto,objc,obj-c++

or other dups like
$ ../../src/gcc-13.mine/configure --enable-languages=3Dc++,c++,lto
configure: error:=20
The following requested languages could not be built: c++
Supported languages are: c,c,c++,fortran,go,lto,objc,obj-c++

I'm not sure why duplicates are not ignored silently.=