PGSQL and POD_SQL: don't include pg_config.h

Even if that header file is available, we better consider it private,
and don't include it.  The information about whether SSL support is
enabled is now missing (`USE_(OPEN)SSL`), and it seems there is no
alternative way to get it (`PQinitSSL()` is always defined), so we
remove it from the PHP info.  Furthermore, the `PG_VERSION` and
`PG_VERSION_STR` macros are no longer available, but as of libpq 9.1
there is `PQlibVersion()` which allows us to construct `PG_VERSION` in
a most likely backwards compatible manner.  The additional information
available through `PG_VERSION_STR` is lost, though, so we define
`PGSQL_LIBPQ_VERSION_STR` basically as alias of `PGSQL_LIBPQ_VERSION`,
and deprecate it right away.

Since we are now requiring at least libpq 9.1, we can remove some
further compatibility code and additional checks.

Regarding the raised requirements: official support for PostGreSQL 9.0
ended on 2015-10-08, and even CentOS 7 already has PostGreSQL 9.2, so
this is not supposed to be too much of an issue.

5 files changed, 27 insertions, 23 deletions

diff --git a/ext/pdo_pgsql/config.m4 b/ext/pdo_pgsql/config.m4
index 7655357de4..80ffd97ac2 100644
--- a/ext/pdo_pgsql/config.m4
+++ b/ext/pdo_pgsql/config.m4
@@ -24,7 +24,6 @@ if test "$PHP_PDO_PGSQL" != "no"; then
     AC_MSG_RESULT([$PG_CONFIG])
     PGSQL_INCLUDE=`$PG_CONFIG --includedir`
     PGSQL_LIBDIR=`$PG_CONFIG --libdir`
-    AC_DEFINE(HAVE_PG_CONFIG_H,1,[Whether to have pg_config.h])
   else
     AC_MSG_RESULT(not found)
     if test "$PHP_PDO_PGSQL" = "yes"; then
@@ -38,9 +37,6 @@ if test "$PHP_PDO_PGSQL" != "no"; then
         if test -r "$i/$j/libpq-fe.h"; then
           PGSQL_INC_BASE=$i
           PGSQL_INCLUDE=$i/$j
-          if test -r "$i/$j/pg_config.h"; then
-            AC_DEFINE(HAVE_PG_CONFIG_H,1,[Whether to have pg_config.h])
-          fi
         fi
       done
 
@@ -70,10 +66,7 @@ if test "$PHP_PDO_PGSQL" != "no"; then
   old_LDFLAGS=$LDFLAGS
   LDFLAGS="-L$PGSQL_LIBDIR $LDFLAGS"
 
-  AC_CHECK_LIB(pq, PQprepare,, AC_MSG_ERROR([Unable to build the PDO PostgreSQL driver: a newer libpq is required]))
-  AC_CHECK_LIB(pq, PQexecParams,, AC_MSG_ERROR([Unable to build the PDO PostgreSQL driver: a newer libpq is required]))
-  AC_CHECK_LIB(pq, PQescapeStringConn,, AC_MSG_ERROR([Unable to build the PDO PostgreSQL driver: a newer libpq is required]))
-  AC_CHECK_LIB(pq, PQescapeByteaConn,, AC_MSG_ERROR([Unable to build the PDO PostgreSQL driver: a newer libpq is required]))
+  AC_CHECK_LIB(pq, PQlibVersion,, AC_MSG_ERROR([Unable to build the PDO PostgreSQL driver: at least libpq 9.1 is required]))
 
   LIBS=$old_LIBS
   LDFLAGS=$old_LDFLAGS
diff --git a/ext/pdo_pgsql/config.w32 b/ext/pdo_pgsql/config.w32
index 12ba8b7a07..cda62a64db 100644
--- a/ext/pdo_pgsql/config.w32
+++ b/ext/pdo_pgsql/config.w32
@@ -7,9 +7,6 @@ if (PHP_PDO_PGSQL != "no") {
 			CHECK_HEADER_ADD_INCLUDE("libpq-fe.h", "CFLAGS_PDO_PGSQL", PHP_PDO_PGSQL + "\\include;" + PHP_PHP_BUILD + "\\include\\pgsql;" + PHP_PHP_BUILD + "\\include\\libpq;")) {
 		EXTENSION("pdo_pgsql", "pdo_pgsql.c pgsql_driver.c pgsql_statement.c");
 
-		if (CHECK_HEADER_ADD_INCLUDE("pg_config.h", "CFLAGS_PDO_PGSQL", PHP_PDO_PGSQL + ";" + PHP_PHP_BUILD + "\\include\\pgsql;" + PHP_PHP_BUILD + "\\include\\libpq;")) {
-			ADD_FLAG('CFLAGS_PDO_PGSQL', "/D HAVE_PG_CONFIG_H");
-		}
 		if (X64) {
 			ADD_FLAG('CFLAGS_PDO_PGSQL', "/D HAVE_PG_LO64=1");
 		}
diff --git a/ext/pdo_pgsql/pdo_pgsql.c b/ext/pdo_pgsql/pdo_pgsql.c
index 815d1ceb88..047329d3cb 100644
--- a/ext/pdo_pgsql/pdo_pgsql.c
+++ b/ext/pdo_pgsql/pdo_pgsql.c
@@ -26,11 +26,6 @@
 #include "php_pdo_pgsql.h"
 #include "php_pdo_pgsql_int.h"
 
-#ifdef HAVE_PG_CONFIG_H
-#undef SIZEOF_OFF_T
-#include <pg_config.h>
-#endif
-
 /* {{{ pdo_pgsql_functions[] */
 static const zend_function_entry pdo_pgsql_functions[] = {
 	PHP_FE_END
@@ -96,11 +91,12 @@ PHP_MSHUTDOWN_FUNCTION(pdo_pgsql)
  */
 PHP_MINFO_FUNCTION(pdo_pgsql)
 {
+	char buf[16];
+
 	php_info_print_table_start();
 	php_info_print_table_row(2, "PDO Driver for PostgreSQL", "enabled");
-#ifdef HAVE_PG_CONFIG_H
-	php_info_print_table_row(2, "PostgreSQL(libpq) Version", PG_VERSION);
-#endif
+	pdo_libpq_version(buf, sizeof(buf));
+	php_info_print_table_row(2, "PostgreSQL(libpq) Version", buf);
 	php_info_print_table_end();
 }
 /* }}} */
diff --git a/ext/pdo_pgsql/pgsql_driver.c b/ext/pdo_pgsql/pgsql_driver.c
index 685a64e451..31d1bf59f7 100644
--- a/ext/pdo_pgsql/pgsql_driver.c
+++ b/ext/pdo_pgsql/pgsql_driver.c
@@ -30,7 +30,6 @@
 #include "pdo/php_pdo_error.h"
 #include "ext/standard/file.h"
 #undef SIZEOF_OFF_T
-#include "pg_config.h" /* needed for PG_VERSION */
 #include "php_pdo_pgsql.h"
 #include "php_pdo_pgsql_int.h"
 #include "zend_exceptions.h"
@@ -377,6 +376,20 @@ static char *pdo_pgsql_last_insert_id(pdo_dbh_t *dbh, const char *name, size_t *
 	return id;
 }
 
+void pdo_libpq_version(char *buf, size_t len)
+{
+	int version = PQlibVersion();
+	int major = version / 10000;
+	if (major >= 10) {
+		int minor = version % 10000;
+		snprintf(buf, len, "%d.%d", major, minor);
+	} else {
+		int minor = version / 100 % 100;
+		int revision = version % 100;
+		snprintf(buf, len, "%d.%d.%d", major, minor, revision);
+	}
+}
+
 static int pdo_pgsql_get_attribute(pdo_dbh_t *dbh, zend_long attr, zval *return_value)
 {
 	pdo_pgsql_db_handle *H = (pdo_pgsql_db_handle *)dbh->driver_data;
@@ -390,9 +403,12 @@ static int pdo_pgsql_get_attribute(pdo_dbh_t *dbh, zend_long attr, zval *return_
 			ZVAL_BOOL(return_value, H->disable_prepares);
 			break;
 
-		case PDO_ATTR_CLIENT_VERSION:
-			ZVAL_STRING(return_value, PG_VERSION);
+		case PDO_ATTR_CLIENT_VERSION: {
+			char buf[16];
+			pdo_libpq_version(buf, sizeof(buf));
+			ZVAL_STRING(return_value, buf);
 			break;
+		}
 
 		case PDO_ATTR_SERVER_VERSION:
 			if (PQprotocolVersion(H->server) >= 3) { /* PostgreSQL 7.4 or later */
@@ -458,8 +474,8 @@ static int pdo_pgsql_get_attribute(pdo_dbh_t *dbh, zend_long attr, zval *return_
 					(char*)PQparameterStatus(H->server, "DateStyle"));
 
 			ZVAL_STR(return_value, str_info);
-		}
 			break;
+		}
 
 		default:
 			return 0;
diff --git a/ext/pdo_pgsql/php_pdo_pgsql_int.h b/ext/pdo_pgsql/php_pdo_pgsql_int.h
index 5d80e32205..07dfa8ce27 100644
--- a/ext/pdo_pgsql/php_pdo_pgsql_int.h
+++ b/ext/pdo_pgsql/php_pdo_pgsql_int.h
@@ -107,4 +107,6 @@ enum pdo_pgsql_specific_constants {
 php_stream *pdo_pgsql_create_lob_stream(zval *pdh, int lfd, Oid oid);
 extern const php_stream_ops pdo_pgsql_lob_stream_ops;
 
+void pdo_libpq_version(char *buf, size_t len);
+
 #endif /* PHP_PDO_PGSQL_INT_H */