[Bug libc/17679] Can't use htole*, htobe*, __bswap* functions in static/global context

["ddstreet at ieee dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17679

--- Comment #1 from Dan Streetman <ddstreet at ieee dot org> ---
Created attachment 7996
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7996&action=edit
Patch to add tests to tst-bswap and tst-endian

This patch adds tests for this bug.  When building, you can clearly see the
failure:

In file included from ../bits/byteswap.h:34:0,
                 from ../string/byteswap.h:24,
                 from ../include/byteswap.h:1,
                 from tst-bswap.c:19:
../bits/byteswap-16.h:26:6: error: braced-group within expression allowed only
inside a function
      ({ unsigned short int __bsx = (unsigned short int) (x);        \
      ^
tst-bswap.c:28:28: note: in expansion of macro â__bswap_16â
 static __uint16_t swap16 = __bswap_16(0x1234);
                            ^
tst-bswap.c:31:1: error: initializer element is not constant
 static __uint32_t swap32 = __bswap_32(0x12345678);
 ^
tst-bswap.c:34:1: error: initializer element is not constant
 static __uint64_t swap64 = __bswap_64(0x1234567890abcdefULL);
 ^

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