merge #2501 #2894
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merge #2501 #2894
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Even with -fvisibility=hidden added to CFLAGS, any symbol which is given a default visibility attribute ends up exported in the dynamic library. This happens through zstd_internal.h which defines ..._STATIC_LINKING_ONLY before including various header files, and is included for example in lib/common/pool.c. To avoid this, this patch distinguishes static and non-static APIs, by using ZSTDLIB_API only for the latter, and introducing ZSTDLIB_STATIC_API for the former. For now, both are exported, but non-static APIs can be hidden by overriding the definition ZSTDLIB_STATIC_API. lib/Makefile is modified to allow this using make CPPFLAGS_DYNLIB=-DZSTDLIB_STATIC_API=ZSTDLIB_HIDDEN In addition, API declarations are dropped from zstd_compress.c (they aren't needed there). Signed-off-by: Stephen Kitt <[email protected]>
Explicitly hide static symbols
now included from libzstd.mk
terrelln
approved these changes
Dec 2, 2021
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Merge #2051 by @skitt after rebasing it.
The PR makes it possible to selectively disable
staticsymbols from the list of exposed symbols in the dynamic library.Static symbols remain exposed by
libzstdby default, as it's the historical policy.