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When g-ir-scanner is used by another project, than that project might have the GLIB_VERSION_* macros defined. This is useful to ensure that only intended glib API is used. The project might then also pass the CFLAGS to g-ir-scanner, without filtering those defines out. This can lead to compiler warnings. For example, NetworkManager sets the version macros to GLIB_VERSION_2_40 and thus gets these warnings /NetworkManager/tmp-introspect66917zc4/NM-1.0.c: In function ‘dump_object_type’: /NetworkManager/tmp-introspect66917zc4/NM-1.0.c:252:13: warning: Not available before 2.70 252 | if (G_TYPE_IS_FINAL (type)) | ^~~~~~~~~~~~~~~~~ /NetworkManager/tmp-introspect66917zc4/NM-1.0.c: In function ‘dump_fundamental_type’: /NetworkManager/tmp-introspect66917zc4/NM-1.0.c:370:13: warning: Not available before 2.70 370 | if (G_TYPE_IS_FINAL (type)) | ^~~~~~~~~~~~~~~~...
