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Explicitly specify C symbol visibility 

In order for blake3 to be usable as a shared library on Windows it is
required to annotate public symbols. Use this as an opportunity to prune
the symbol table for other OSes, too.
This commit is contained in:
Henrik S. Gaßmann 2023-05-11 13:25:59 +02:00
parent e45c0c6795
commit 96487de258
3 changed files with 46 additions and 15 deletions
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9
c/CMakeLists.txt
View File

@ -35,10 +35,19 @@ add_library(blake3
add_library(BLAKE3::blake3 ALIAS blake3)
# library configuration
set(BLAKE3_PKGCONFIG_CFLAGS)
if (BUILD_SHARED_LIBS)
target_compile_definitions(blake3
PUBLIC BLAKE3_DLL
PRIVATE BLAKE3_DLL_EXPORTS
)
list(APPEND BLAKE3_PKGCONFIG_CFLAGS -DBLAKE3_DLL)
endif()
target_include_directories(blake3 PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
set_target_properties(blake3 PROPERTIES
VERSION ${PROJECT_VERSION}
SOVERSION 0
C_VISIBILITY_PRESET hidden
)
# optional SIMD sources

50
c/blake3.h
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@ -4,6 +4,28 @@
#include <stddef.h>
#include <stdint.h>
#if !defined(BLAKE3_API)
# if defined(_WIN32) || defined(__CYGWIN__)
# if defined(BLAKE3_DLL)
# if defined(BLAKE3_DLL_EXPORTS)
# define BLAKE3_API __declspec(dllexport)
# else
# define BLAKE3_API __declspec(dllimport)
# endif
# define BLAKE3_PRIVATE
# else
# define BLAKE3_API
# define BLAKE3_PRIVATE
# endif
# elif __GNUC__ >= 4
# define BLAKE3_API __attribute__((visibility("default")))
# define BLAKE3_PRIVATE __attribute__((visibility("hidden")))
# else
# define BLAKE3_API
# define BLAKE3_PRIVATE
# endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
@ -38,20 +60,20 @@ typedef struct {
uint8_t cv_stack[(BLAKE3_MAX_DEPTH + 1) * BLAKE3_OUT_LEN];
} blake3_hasher;
const char *blake3_version(void);
void blake3_hasher_init(blake3_hasher *self);
void blake3_hasher_init_keyed(blake3_hasher *self,
const uint8_t key[BLAKE3_KEY_LEN]);
void blake3_hasher_init_derive_key(blake3_hasher *self, const char *context);
void blake3_hasher_init_derive_key_raw(blake3_hasher *self, const void *context,
size_t context_len);
void blake3_hasher_update(blake3_hasher *self, const void *input,
size_t input_len);
void blake3_hasher_finalize(const blake3_hasher *self, uint8_t *out,
size_t out_len);
void blake3_hasher_finalize_seek(const blake3_hasher *self, uint64_t seek,
uint8_t *out, size_t out_len);
void blake3_hasher_reset(blake3_hasher *self);
BLAKE3_API const char *blake3_version(void);
BLAKE3_API void blake3_hasher_init(blake3_hasher *self);
BLAKE3_API void blake3_hasher_init_keyed(blake3_hasher *self,
const uint8_t key[BLAKE3_KEY_LEN]);
BLAKE3_API void blake3_hasher_init_derive_key(blake3_hasher *self, const char *context);
BLAKE3_API void blake3_hasher_init_derive_key_raw(blake3_hasher *self, const void *context,
size_t context_len);
BLAKE3_API void blake3_hasher_update(blake3_hasher *self, const void *input,
size_t input_len);
BLAKE3_API void blake3_hasher_finalize(const blake3_hasher *self, uint8_t *out,
size_t out_len);
BLAKE3_API void blake3_hasher_finalize_seek(const blake3_hasher *self, uint64_t seek,
uint8_t *out, size_t out_len);
BLAKE3_API void blake3_hasher_reset(blake3_hasher *self);
#ifdef __cplusplus
}

2
c/libblake3.pc.in
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@ -9,4 +9,4 @@ Version: @PROJECT_VERSION@
Requires:
Libs: -L${libdir} -lblake3
Cflags: -I${includedir}
Cflags: -I${includedir} @BLAKE3_PKGCONFIG_CFLAGS@