vala: improve support, especially builddir vs. srcdir.

This change fixes https://bugs.gnu.org/13002.

* NEWS: mention these changes.
* bin/automake.in: generated C files go in builddir, not srcdir.
Distribute the header files generated from VAPI files.
* t/vala-libs-distcheck.sh: new test for `make distcheck' of a
Vala library.
* t/vala-libs-vpath.sh: new test for a VPATH build of a Vala library.
* t/vala-libs.sh: add local VAPIs used as external --package to test.

* t/vala-recursive-setup.sh: we need to make
maintainer-clean at one point to remove stamp files to avoid
confusing a VPATH build performed after a non-VPATH build.
* t/vala-non-recursive-setup.sh: likewise.

* t/vala-parallel.sh: some test paths need changing to take into
account that generated C files now go in builddir.
* t/vala-per-target-flags.sh: likewise.
* t/vala-recursive-setup.sh: likewise.
* t/vala-vpath.sh: likewise.

1 files changed, 6 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 9c69e48d1..010cd3756 100644
--- a/NEWS
+++ b/NEWS
@@ -81,6 +81,10 @@ New in ?.?.?:
 
   - valac argument matching more precise, to avoid garbage in DIST_COMMON.
 
+  - Support for Vala in VPATH builds fixed so that both freshly-generated and
+    distributed C files work, and operation is more reliable with or without
+    an installed valac.
+
 * Distribution
 
   - new variable AM_DISTCHECK_DVI_TARGET, to allow overriding the
@@ -91,6 +95,8 @@ New in ?.?.?:
   - Removed function up_to_date_p in lib/Automake/FileUtils.pm.
     We believe this function is completely unused.
 
+  - Support for in-tree Vala libraries improved.
+
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 New in 1.16.2: