build: improve our use of glib's version macros to catch more bugs

We were setting GLIB_VERSION_MAX_ALLOWED to 2.34, since we provide
reimplementations of a few 2.34 functions in nm-glib-compat.h. But
this was turning off warnings for the 2.34+ APIs we *didn't* have
compat versions of too.

Fix this by setting MAX_ALLOWED to 2.32 (same as MIN_REQUIRED), and
defining macros to wrap calls to compat-ified functions and disable
deprecation warnings around them.

This points out several places where we were accidentally using 2.34
APIs without noticing, which need to be fixed now.

Makefile.am

@@ -57,7 +57,7 @@ cscope:
 	cscope -b -q -R -Iinclude -ssrc -slibnm-glib -slibnm-util -scli/src;
 
 libgsystem_srcpath := libgsystem
-libgsystem_cflags := $(GLIB_CFLAGS) -I$(srcdir)/libgsystem
+libgsystem_cflags := $(filter-out -DGLIB_VERSION%,$(GLIB_CFLAGS)) -I$(srcdir)/libgsystem
 libgsystem_libs = $(GLIB_LIBS)
 include libgsystem/Makefile-libgsystem.am
 noinst_LTLIBRARIES = libgsystem.la

configure.ac

@@ -254,12 +254,10 @@ AM_CONDITIONAL(HAVE_DBUS_GLIB_100, test "${have_dbus_glib_100}" = "yes")
 PKG_CHECK_MODULES(GLIB, gio-unix-2.0 >= 2.32 gmodule-2.0)
 
 dnl GLIB_VERSION_MIN_REQUIRED should match the version above.
-dnl GLIB_VERSION_MAX_ALLOWED should be the largest version for which there
-dnl is a GLIB_CHECK_VERSION check. We currently have to use
-dnl G_ENCODE_VERSION(2,34) here rather than GLIB_VERSION_2_34, because
-dnl GLib 2.32 did not handle future version defines correctly.
-
-GLIB_CFLAGS="$GLIB_CFLAGS -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_32 '-DGLIB_VERSION_MAX_ALLOWED=G_ENCODE_VERSION(2,34)'"
+dnl GLIB_VERSION_MAX_ALLOWED should be set to the same version;
+dnl nm-glib-compat.h will cause it to be overridden for the functions
+dnl we have compat versions of.
+GLIB_CFLAGS="$GLIB_CFLAGS -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_32 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32"
 
 AC_SUBST(GLIB_CFLAGS)
 AC_SUBST(GLIB_LIBS)

include/nm-glib-compat.h

@@ -55,6 +55,40 @@ g_type_ensure (GType type)
 			_destroy (_p); \
 	} G_STMT_END
 
+/* These are used to clean up the output of test programs; we can just let
+ * them no-op in older glib.
+ */
+#define g_test_expect_message(log_domain, log_level, pattern)
+#define g_test_assert_expected_messages()
+
+#else
+
+/* We build with -DGLIB_MAX_ALLOWED_VERSION set to 2.32 to make sure we don't
+ * accidentally use new API that we shouldn't. But we don't want warnings for
+ * the APIs that we emulate above.
+ */
+
+#define g_type_ensure(t) \
+	G_STMT_START { \
+		G_GNUC_BEGIN_IGNORE_DEPRECATIONS \
+		g_type_ensure (t); \
+		G_GNUC_END_IGNORE_DEPRECATIONS \
+	} G_STMT_END
+
+#define g_test_expect_message(domain, level, format...) \
+	G_STMT_START { \
+		G_GNUC_BEGIN_IGNORE_DEPRECATIONS \
+		g_test_expect_message (domain, level, format); \
+		G_GNUC_END_IGNORE_DEPRECATIONS \
+	} G_STMT_END
+
+#define g_test_assert_expected_messages_internal(domain, file, line, func) \
+	G_STMT_START { \
+		G_GNUC_BEGIN_IGNORE_DEPRECATIONS \
+		g_test_assert_expected_messages_internal (domain, file, line, func); \
+		G_GNUC_END_IGNORE_DEPRECATIONS \
+	} G_STMT_END
+
 #endif
 
 #endif  /* NM_GLIB_COMPAT_H */

tui/newt/Makefile.am

@@ -1,4 +1,5 @@
 AM_CPPFLAGS= \
+	-I$(top_srcdir)/include \
 	$(GLIB_CFLAGS) \
 	$(NEWT_CFLAGS) \
 	$(NULL)

tui/newt/nmt-newt-types.h

@@ -21,6 +21,7 @@
 
 #include <glib-object.h>
 #include <newt.h>
+#include "nm-glib-compat.h"
 
 G_BEGIN_DECLS
 

tui/newt/nmt-newt-utils.c

@@ -26,6 +26,7 @@
 #include <errno.h>
 #include <stdarg.h>
 #include <unistd.h>
+#include <sys/wait.h>
 
 #include <glib/gi18n-lib.h>
 
@@ -350,11 +351,21 @@ nmt_newt_edit_string (const char *data)
 		goto done;
 	}
 
+#if GLIB_CHECK_VERSION (2, 34, 0)
+	G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 	if (!g_spawn_check_exit_status (status, &error)) {
 		nmt_newt_message_dialog (_("Editor failed: %s"), error->message);
 		g_error_free (error);
 		goto done;
 	}
+	G_GNUC_END_IGNORE_DEPRECATIONS
+#else
+	if (WIFEXITED (status)) {
+		if (WEXITSTATUS (status) != 0)
+			nmt_newt_message_dialog (_("Editor failed with status %d"), WEXITSTATUS (status));
+	} else if (WIFSIGNALED (status))
+		nmt_newt_message_dialog (_("Editor failed with signal %d"), WTERMSIG (status));
+#endif
 
 	if (!g_file_get_contents (filename, &new_data, NULL, &error)) {
 		nmt_newt_message_dialog (_("Could not re-read file: %s"), error->message);