libpsl.h.in: Decorate public symbols for export

Introduce a macro, PSL_API, which is used by the compiler to instruct the
linker to export the public symbols, such as __declspec (dllexport) on
Visual Studio.

include/libpsl.h.in

@@ -40,6 +40,16 @@
 #define PSL_VERSION_PATCH @LIBPSL_VERSION_PATCH@
 #define PSL_VERSION_NUMBER @LIBPSL_VERSION_NUMBER@
 
+#if defined (BUILDING_PSL) && defined (HAVE_VISIBILITY)
+# define PSL_API __attribute__ ((__visibility__("default")))
+#elif  defined (BUILDING_PSL) && defined (_MSC_VER) && !defined (PSL_STATIC)
+# define PSL_API __declspec(dllexport)
+#elif defined (_MSC_VER) && !defined (PSL_STATIC)
+# define PSL_API __declspec(dllimport)
+#else
+# define PSL_API
+#endif
+
 #ifdef  __cplusplus
 extern "C" {
 #endif
@@ -77,90 +87,112 @@ typedef enum {
 typedef struct _psl_ctx_st psl_ctx_t;
 
 /* frees PSL context */
+PSL_API
 void
 	psl_free(psl_ctx_t *psl);
 
 /* frees memory allocated by libpsl routines */
+PSL_API
 void
 	psl_free_string(char *str);
 
 /* loads PSL data from file */
+PSL_API
 psl_ctx_t *
 	psl_load_file(const char *fname);
 
 /* loads PSL data from FILE pointer */
+PSL_API
 psl_ctx_t *
 	psl_load_fp(FILE *fp);
 
 /* retrieves builtin PSL data */
+PSL_API
 const psl_ctx_t *
 	psl_builtin(void);
 
 /* retrieves most recent PSL data */
+PSL_API
 psl_ctx_t *
 	psl_latest(const char *fname);
 
 /* checks whether domain is a public suffix or not */
+PSL_API
 int
 	psl_is_public_suffix(const psl_ctx_t *psl, const char *domain);
 
 /* checks whether domain is a public suffix regarding the type or not */
+PSL_API
 int
 	psl_is_public_suffix2(const psl_ctx_t *psl, const char *domain, int type);
 
 /* checks whether cookie_domain is acceptable for domain or not */
+PSL_API
 int
 	psl_is_cookie_domain_acceptable(const psl_ctx_t *psl, const char *hostname, const char *cookie_domain);
 
 /* returns the longest not registrable domain within 'domain' or NULL if none found */
+PSL_API
 const char *
 	psl_unregistrable_domain(const psl_ctx_t *psl, const char *domain);
 
 /* returns the shortest possible registrable domain part or NULL if domain is not registrable at all */
+PSL_API
 const char *
 	psl_registrable_domain(const psl_ctx_t *psl, const char *domain);
 
 /* convert a string into lowercase UTF-8 */
+PSL_API
 psl_error_t
 	psl_str_to_utf8lower(const char *str, const char *encoding, const char *locale, char **lower);
 
 /* does not include exceptions */
+PSL_API
 int
 	psl_suffix_count(const psl_ctx_t *psl);
 
 /* just counts exceptions */
+PSL_API
 int
 	psl_suffix_exception_count(const psl_ctx_t *psl);
 
 /* just counts wildcards */
+PSL_API
 int
 	psl_suffix_wildcard_count(const psl_ctx_t *psl);
 
 /* returns mtime of PSL source file */
+PSL_API
 time_t
 	psl_builtin_file_time(void);
 
 /* returns SHA1 checksum (hex-encoded, lowercase) of PSL source file */
+PSL_API
 const char *
 	psl_builtin_sha1sum(void);
 
 /* returns file name of PSL source file */
+PSL_API
 const char *
 	psl_builtin_filename(void);
 
 /* returns name of distribution PSL data file */
+PSL_API
 const char *
 	psl_dist_filename(void);
 
 /* returns library version string */
+PSL_API
 const char *
 	psl_get_version(void);
 
 /* checks library version number */
+PSL_API
 int
 	psl_check_version_number(int version);
 
 /* returns whether the built-in data is outdated or not */
+PSL_API
 int
 	psl_builtin_outdated(void);
 

src/Makefile.am

@@ -7,7 +7,11 @@ CLEANFILES = suffixes_dafsa.c
 lib_LTLIBRARIES = libpsl.la
 
 libpsl_la_SOURCES = psl.c lookup_string_in_fixed_set.c
-libpsl_la_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include -DPSL_DISTFILE=\"$(PSL_DISTFILE)\"
+libpsl_la_CPPFLAGS =	\
+	-I$(top_srcdir)/include	\
+	-I$(top_builddir)/include	\
+	-DPSL_DISTFILE=\"$(PSL_DISTFILE)\"	\
+	-DBUILDING_PSL
 # include ABI version information
 libpsl_la_LDFLAGS = -version-info $(LIBPSL_SO_VERSION)
 if WITH_LIBICU