[PATCH 2/3] Vala: Add and test rebuild rules for generated header and vapi files

[Jürg Billeter]

valac will generate additional files when using, for example, -H in
VALAFLAGS. We need to recognize these options and add appropriate
rebuild rules to fix parallel build.

Signed-off-by: Jürg Billeter <address@hidden>
---
 automake.in      |   26 ++++++++++++++++++++++++++
 tests/vala2.test |    6 ++++++
 2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/automake.in b/automake.in
index be52505..a2b735f 100755
--- a/automake.in
+++ b/automake.in
@@ -5951,6 +5951,32 @@ sub lang_vala_finish_target ($$)
         }
     }
 
+  # Add rebuild rules for generated header and vapi files
+  my $flags = var ($derived . '_VALAFLAGS');
+  if ($flags)
+    {
+      my $lastflag = '';
+      foreach my $flag ($flags->value_as_list_recursive)
+       {
+         if (grep (/$lastflag/, ('-H', '-h', '--header', '--internal-header',
+                                 '--vapi', '--internal-vapi', '--gir')))
+           {
+             my $headerfile = $flag;
+             $output_rules .= "$headerfile: ${derived}_vala.stamp\n".
+               "address@hidden test -f \$@; then :; else \\\n".
+               "\t  rm -f ${derived}_vala.stamp; \\\n".
+               "\t  \$(MAKE) \$(AM_MAKEFLAGS) ${derived}_vala.stamp; \\\n".
+               "\tfi\n";
+
+             # valac is not used when building from dist tarballs
+             # distribute the generated files
+             push_dist_common ($headerfile);
+             $clean_files{$headerfile} = MAINTAINER_CLEAN;
+           }
+         $lastflag = $flag;
+       }
+    }
+
   my $compile = $self->compile;
 
   # Rewrite each occurrence of `AM_VALAFLAGS' in the compile
diff --git a/tests/vala2.test b/tests/vala2.test
index a6efba9..bfa38cd 100755
--- a/tests/vala2.test
+++ b/tests/vala2.test
@@ -44,6 +44,7 @@ END
 
 cat > 'src/Makefile.am' <<'END'
 bin_PROGRAMS = zardoz
+zardoz_VALAFLAGS = -H zardoz.h
 zardoz_CFLAGS = $(GOBJECT_CFLAGS)
 zardoz_LDADD = $(GOBJECT_LIBS)
 zardoz_SOURCES = zardoz.vala
@@ -67,6 +68,11 @@ $AUTOMAKE -a
 
 ./configure || Exit 77
 $MAKE
+
+# test rebuild rules
+rm src/zardoz.h
+$MAKE -C src zardoz.h
+
 $MAKE distcheck
 $MAKE distclean
 mkdir build
-- 
1.6.3