liblzma: Avoid compiler warning without creating extra symbol.

When the generic fast crc64 method is used, then we omit
lzma_crc64_table[][]. Similar to
d9166b52cf3458a4da3eb92224837ca8fc208d79, we can avoid compiler warnings
with -Wempty-translation-unit (Clang) or -pedantic (GCC) by creating a
never used typedef instead of an extra symbol.

diff --git a/src/liblzma/check/crc64_table.c b/src/liblzma/check/crc64_table.c
index 241adcd4a5cbeba2251fd078fc8a3914f8baf411..6f9adb04d57d3df3ea3d893a01d6096923433d68 100644 (file)
--- a/src/liblzma/check/crc64_table.c
+++ b/src/liblzma/check/crc64_table.c
@@ -20,8 +20,7 @@
                || (defined(__e2k__) && __iset__ >= 6)
 // No table needed but something has to be exported to keep some toolchains
 // happy. Also use a declaration to silence compiler warnings.
-extern const char lzma_crc64_dummy;
-const char lzma_crc64_dummy;
+typedef void lzma_crc64_dummy;
 
 #else
 // Having the declaration here silences clang -Wmissing-variable-declarations.