Issue #9993 has been reported by Denis Knauf.

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Bug #9993: x86_64 linux + i686 os = 32bit ruby, but `RUBY_PLATFORM=x86_64`
https://bugs.ruby-lang.org/issues/9993

* Author: Denis Knauf
* Status: Open
* Priority: Normal
* Assignee: cruby-linux
* Category: platform/linux
* Target version: 
* ruby -v: 2.1.2, 2.2.0dev
* Backport: 
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Hi,

On x86_64 Linux Kernel, but i686 OS (there is no 64-binary file anywhere), this will produce a i686-binary ruby, but RUBY_PLATFORM=x86_64-linux:

    # ./configure && make
    Downloading config.guess...
    Downloading config.sub...
    checking build system type... x86_64-unknown-linux-gnu
    checking host system type... x86_64-unknown-linux-gnu
    checking target system type... x86_64-unknown-linux-gnu

System type is wrong.

[...]

    # ./ruby --disable-all -e 'puts RUBY_PLATFORM'
    x86_64-linux
    # file ./ruby
    ruby: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, not stripped

This works fine:

    # ./configure --with-arch=i686 && make
    ./configure --with-arch=i686 && make 
    checking build system type... x86_64-unknown-linux-gnu
    checking host system type... x86_64-unknown-linux-gnu
    checking target system type... x86_64-unknown-linux-gnu

System type is wrong, too, but:

[...]

    # ./ruby --disable-all -e 'puts RUBY_PLATFORM'
    i686-linux
    # file ruby
    ruby: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, not stripped

In config.log i found in both situations this:

    uname -m = x86_64

`uname -m` prints the kernel system type, not the os system type.

It isn't possible to compile a x86_64-binary on this machine, there is no compiler for that. Only for i386.

    configure:3795: gcc -v >&5
    Using built-in specs.
    Target: i486-linux-gnu



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