Fix API visibility for libsquashfs.so

This commit adds a "predef.h" header to libsquashfs that exposes two
macros, SQFS_API and SQFS_INTERNAL that are used to explicilty set
the visibiliy of stuff that ends up in libsquashfs to default or
hidden.

For compatibillity with Windows which may at some point eventually be
considered, the SQFS_API define is set to dllexport IF the cpp symbol
SQFS_BUILDING_DLL is defined and set to import otherwise.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 7 insertions, 4 deletions

diff --git a/include/sqfs/super.h b/include/sqfs/super.h
index 0df1691..6593555 100644
--- a/include/sqfs/super.h
+++ b/include/sqfs/super.h
@@ -9,6 +9,8 @@
 
 #include "config.h"
 
+#include "sqfs/predef.h"
+
 #include <stdint.h>
 #include <stddef.h>
 
@@ -71,14 +73,15 @@ extern "C" {
 #endif
 
 /* Returns 0 on success. Prints error messages to stderr on failure. */
-int sqfs_super_init(sqfs_super_t *super, size_t block_size, uint32_t mtime,
-		    E_SQFS_COMPRESSOR compressor);
+SQFS_API int sqfs_super_init(sqfs_super_t *super, size_t block_size,
+			     uint32_t mtime,
+			     E_SQFS_COMPRESSOR compressor);
 
 /* Returns 0 on success. Prints error messages to stderr on failure. */
-int sqfs_super_write(sqfs_super_t *super, int fd);
+SQFS_API int sqfs_super_write(sqfs_super_t *super, int fd);
 
 /* Returns 0 on success. Prints error messages to stderr on failure. */
-int sqfs_super_read(sqfs_super_t *super, int fd);
+SQFS_API int sqfs_super_read(sqfs_super_t *super, int fd);
 
 #ifdef __cplusplus
 }