shared libpq for wasm client

src/interfaces/libpq/fe-auth.c

@@ -1168,6 +1168,7 @@ char *
 pg_fe_getusername(uid_t user_id, PQExpBuffer errorMessage)
 {
 	char	   *result = NULL;
+#if !defined(__EMSCRIPTEN__)
 	const char *name = NULL;
 
 #ifdef WIN32
@@ -1191,7 +1192,9 @@ pg_fe_getusername(uid_t user_id, PQExpBuffer errorMessage)
 	else if (errorMessage)
 		appendPQExpBuffer(errorMessage, "%s\n", pwdbuf);
 #endif
-
+#else
+	const char *name = WASM_USERNAME;
+#endif
 	if (name)
 	{
 		result = strdup(name);

src/interfaces/libpq/fe-connect.c

@@ -2015,6 +2015,7 @@ PQsetdbLogin(const char *pghost, const char *pgport, const char *pgoptions,
 static int
 connectNoDelay(PGconn *conn)
 {
+#if !defined(__EMSCRIPTEN__)
 #ifdef	TCP_NODELAY
 	int			on = 1;
 
@@ -2029,7 +2030,7 @@ connectNoDelay(PGconn *conn)
 		return 0;
 	}
 #endif
-
+#endif
 	return 1;
 }
 
@@ -2150,6 +2151,9 @@ connectFailureMessage(PGconn *conn, int errorno)
 static int
 useKeepalives(PGconn *conn)
 {
+#if defined(__EMSCRIPTEN__)
+return 0;
+#else
 	char	   *ep;
 	int			val;
 
@@ -2159,6 +2163,7 @@ useKeepalives(PGconn *conn)
 	if (*ep)
 		return -1;
 	return val != 0 ? 1 : 0;
+#endif
 }
 
 #ifndef WIN32
@@ -2385,13 +2390,14 @@ pqConnectDBStart(PGconn *conn)
 	 * Nobody but developers should see this message, so we don't bother
 	 * translating it.
 	 */
+#if !defined(__EMSCRIPTEN__)
 	if (!pg_link_canary_is_frontend())
 	{
 		appendPQExpBufferStr(&conn->errorMessage,
 							 "libpq is incorrectly linked to backend functions\n");
 		goto connect_errReturn;
 	}
-
+#endif
 	/* Ensure our buffers are empty */
 	conn->inStart = conn->inCursor = conn->inEnd = 0;
 	conn->outCount = 0;

src/interfaces/libpq/legacy-pqsignal.c

@@ -30,6 +30,7 @@
  *
  * libpq itself does not use this.
  */
+#if !defined(__EMSCRIPTEN__)
 pqsigfunc
 pqsignal(int signo, pqsigfunc func)
 {
@@ -53,3 +54,4 @@ pqsignal(int signo, pqsigfunc func)
 	return signal(signo, func);
 #endif
 }
+#endif // __EMSCRIPTEN__