build: Add generated enumeration files to BUILT_SOURCES

Dependency tracking in Automake is a side effect of compilation. This
means two things:

  * headers are ignored when it comes to building dependencies, even
    when listed inside sources for a binary target
  * generated headers included inside source files are not used
    as a dependency until compilation of the source file completes
    successfully

If binary target L depends on a source file C, and that source file
includes a generated header H, there is no guarantee that the header
H will be available by the time source file C is built, because the
dependency is extracted from C itself, not from the list of sources.
Additionally, any header H does not count towards the dependency
resolution because headers are only used for ancillary features, like
extracting tags.

For this reason, Automake has `BUILT_SOURCES`.

This is a bit of obscure corner of Automake that trips up many who are
not practitioners of the Dark Arts.

More information is available here:

https://www.gnu.org/software/automake/manual/html_node/Built-Sources-Example.html#Built-Sources-Example

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libtracker-sparql/Makefile.am b/src/libtracker-sparql/Makefile.am
index 5a96f8186..34cc893b7 100644
--- a/src/libtracker-sparql/Makefile.am
+++ b/src/libtracker-sparql/Makefile.am
@@ -102,7 +102,8 @@ vapi_DATA =                                            \
 	tracker-sparql-$(TRACKER_API_VERSION).deps
 
 BUILT_SOURCES =                                        \
-	libtracker_sparql_intermediate_vala_la_vala.stamp
+	libtracker_sparql_intermediate_vala_la_vala.stamp \
+	$(ENUM_SOURCES)
 
 MAINTAINERCLEANFILES =                                 \
 	tracker-sparql-$(TRACKER_API_VERSION).vapi     \