[vala/staging] build: Use --use-header for libraries

[Rico Tzschichholz <ricotz src gnome org>]

commit e8a7efa282eb1fd0fe186ffb2f26a79106a05f05
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Apr 24 13:52:27 2017 +0200

    build: Use --use-header for libraries
    
    Reduces the size of generated c-sources while avoiding redefinitions.

 ccode/Makefile.am   |    1 +
 codegen/Makefile.am |    1 +
 gee/Makefile.am     |    1 +
 vala/Makefile.am    |    1 +
 4 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/ccode/Makefile.am b/ccode/Makefile.am
index 3e384d7..fb4c66a 100644
--- a/ccode/Makefile.am
+++ b/ccode/Makefile.am
@@ -83,6 +83,7 @@ ccode.vapi ccode.vala.stamp: $(libvalaccode_la_VALASOURCES)
                --vapidir $(top_srcdir)/vapi --pkg gobject-2.0 \
                --vapidir $(top_srcdir)/gee --pkg gee \
                --pkg config \
+               --use-header \
                -H valaccode.h \
                --library ccode \
                $^
diff --git a/codegen/Makefile.am b/codegen/Makefile.am
index e0e3ec9..e8575ab 100644
--- a/codegen/Makefile.am
+++ b/codegen/Makefile.am
@@ -61,6 +61,7 @@ codegen.vapi codegen.vala.stamp: $(libvalaccodegen_la_VALASOURCES)
                --vapidir $(top_srcdir)/gee --pkg gee \
                --vapidir $(top_srcdir)/ccode --pkg ccode \
                --vapidir $(top_srcdir)/vala --pkg vala \
+               --use-header \
                -H valacodegen.h \
                --library codegen \
                $^
diff --git a/gee/Makefile.am b/gee/Makefile.am
index 60ffe54..e51f8b5 100644
--- a/gee/Makefile.am
+++ b/gee/Makefile.am
@@ -43,6 +43,7 @@ gee.vapi gee.vala.stamp: $(libgee_la_VALASOURCES)
                $(VALAFLAGS) \
                -C \
                --vapidir $(top_srcdir)/vapi --pkg gobject-2.0 \
+               --use-header \
                -H valagee.h \
                --library gee \
                $^
diff --git a/vala/Makefile.am b/vala/Makefile.am
index 5048a07..30e3ca1 100644
--- a/vala/Makefile.am
+++ b/vala/Makefile.am
@@ -187,6 +187,7 @@ vala.vapi vala.vala.stamp: $(libvala_la_VALASOURCES)
                --vapidir $(top_srcdir)/vapi --pkg gmodule-2.0 --pkg gobject-2.0 \
                --vapidir $(top_srcdir)/gee --pkg gee \
                --pkg config \
+               --use-header \
                -H vala.h \
                --library vala \
                $^