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liblzma: Update a comment.
The C standards don't allow an empty translation unit which can be
avoided by declaring something, without exporting any symbols.
When I committed f644473a21
I had
a feeling that some specific toolchain somewhere didn't like
empty object files (assembler or maybe "ar" complained) but
I cannot find anything to confirm this now. Quite likely I
remembered nonsense. I leave this here as a note to my future self. :-)
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@ -18,8 +18,7 @@
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#if (defined(__x86_64__) && defined(__SSSE3__) \
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&& defined(__SSE4_1__) && defined(__PCLMUL__)) \
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|| (defined(__e2k__) && __iset__ >= 6)
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// No table needed but something has to be exported to keep some toolchains
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// happy. Also use a declaration to silence compiler warnings.
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// No table needed. Use a typedef to avoid an empty translation unit.
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typedef void lzma_crc64_dummy;
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#else
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