[ruby-core:108708] [Ruby master Bug#18808] Cannot compile ruby 3.1.2 on powerpc64le-linux without disabling the jit features

Issue #18808 has been reported by npn (John Davis).

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Bug #18808: Cannot compile ruby 3.1.2 on powerpc64le-linux without disabling the jit features
https://bugs.ruby-lang.org/issues/18808

* Author: npn (John Davis)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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The system I am trying to compile on is a ppc64el system running RedHat 7 (3.10.0-1160.62.1.el7.ppc64le).  I can successfully compile on a x86_64 system running the same version RedHat 7 (3.10.0-1160.62.1.el7.x86_64)

When I configure with the following,  make completes fine,  but if I remove the `--disable-jit-support` it fails with the following error.


     ./configure --enable-shared --enable-load-relative  --disable-install-doc --prefix=$RUBY_PREFIX --exec-prefix=$RUBY_PREFIX/rh_ppc --disable-jit-support

    building rb_mjit_header.h
    rb_mjit_header.h updated
    building .ext/include/powerpc64le-linux/rb_mjit_min_header-3.1.2.h
    error in final header file:
    In file included from /tmp/20220525-12786-q2ndz2.c:1:0:
    /tmp/20220525-12786-vf3xbh.h:16627:1: error: multiple storage classes in declaration specifiers
     __attribute__ ((__visibility__("default"))) extern
     ^
    compilation terminated due to -Wfatal-errors.
    make: *** [.ext/include/powerpc64le-linux/rb_mjit_min_header-3.1.2.h] Error 1



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