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[lib] Make lib compatible with -Wfall-through excepting legacy

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Switch to a macro `ZSTD_FALLTHROUGH;` instead of a comment. On supported
compilers this uses an attribute, otherwise it becomes a comment.

This is necessary to be compatible with clang's `-Wfall-through`, and
gcc's `-Wfall-through=2` which don't support comments. Without this the
linux build emits a bunch of warnings.

Also add a test to CI to ensure that we don't regress.
This commit is contained in:
Nick Terrell
2021-09-22 19:56:07 -07:00
parent e3feec74d3
commit 189e87bcbe
11 changed files with 81 additions and 24 deletions
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2
contrib/linux-kernel/test/include/linux/compiler.h
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@ -18,4 +18,6 @@
#define noinline __attribute__((noinline))
#endif
#define fallthrough __attribute__((__fallthrough__))
#endif