diff options
| -rw-r--r-- | src/liblzma/common/common.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/liblzma/common/common.h b/src/liblzma/common/common.h index 176c3a8f..b09e8ddf 100644 --- a/src/liblzma/common/common.h +++ b/src/liblzma/common/common.h @@ -17,17 +17,28 @@ #include "mythread.h" #include "tuklib_integer.h" +// LZMA_API_EXPORT is used to mark the exported API functions. +// It's used to define the LZMA_API macro. +// +// lzma_attr_visibility_hidden is used for marking *declarations* of extern +// variables that are internal to liblzma (-fvisibility=hidden alone is +// enough to hide the *definitions*). Such markings allow slightly more +// efficient code to accesses those variables in ELF shared libraries. #if defined(_WIN32) || defined(__CYGWIN__) # ifdef DLL_EXPORT # define LZMA_API_EXPORT __declspec(dllexport) # else # define LZMA_API_EXPORT # endif +# define lzma_attr_visibility_hidden // Don't use ifdef or defined() below. #elif HAVE_VISIBILITY # define LZMA_API_EXPORT __attribute__((__visibility__("default"))) +# define lzma_attr_visibility_hidden \ + __attribute__((__visibility__("hidden"))) #else # define LZMA_API_EXPORT +# define lzma_attr_visibility_hidden #endif #define LZMA_API(type) LZMA_API_EXPORT type LZMA_API_CALL |