[Bug stdio/27087] New: PowerPC: Redefinition error with Clang from IEEE redirection headers

["qiu.chaofan at outlook dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27087

            Bug ID: 27087
           Summary: PowerPC: Redefinition error with Clang from IEEE
                    redirection headers
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: qiu.chaofan at outlook dot com
  Target Milestone: ---

Program to re-produce:

    #include <stdio.h>
    int main(void) { return 0; }

Use clang (I tried with latest build, but recent releases should be all fine)
to compile this program with IEEE and optimization options:

    clang test.c -O3 -mabi=ieeelongdouble -I<HEADER_PATH>

An error would happen:

    In file included from test.c:1:
    In file included from /opt/at14.0-1-rc1/include/stdio.h:871:
    /opt/at14.0-1-rc1/include/bits/stdio-ldbl.h:26:20: error: cannot apply asm
label to function after its first use
    __LDBL_REDIR_DECL (vfprintf)
    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~
    /opt/at14.0-1-rc1/include/sys/cdefs.h:461:26: note: expanded from macro
'__LDBL_REDIR_DECL'
      extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128"));
                             ^           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Because under -O, clang (and gcc) defines macro `__USE_EXTERN_INLINES`. The
part is located before #include <bits/stdio-ldbl.h> stuff, so compiler
complains about the re-declaration conflict. Not sure why GCC is silent about
this yet.

By exchanging their position, the error would disappear.

Discussion in clang community about changing this error to warning
(https://reviews.llvm.org/D16171) may be a good reference.

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