[FFmpeg-trac] #7790(build system:new): Endianness detection breaks with LTO

[FFmpeg]

#7790: Endianness detection breaks with LTO
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             Reporter:  RedDwarf82    |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  build system  |                  Version:  4.1
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 ffmpeg's configure wrongly thinks my toolchain uses little-endian because
 of LTO.

 {{{
 $ cat test.c
 unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
 $ gcc -c -o test.o test.c
 $ od -t x1 test.o | grep '42 *49 *47 *45'
 $ gcc -c -o test.o test.c -fno-lto
 $ od -t x1 test.o | grep '42 *49 *47 *45'
 0000160 42 49 47 45 00 47 43 43 3a 20 28 42 75 69 6c 64
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7790>
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