vala: enable the use of vapigen by packages with vala support

Now that gobject-introspection is supported, generation of .vapi
files for develeloping Vala code against gobject-based libraries
should be supported as well.

(From OE-Core rev: 1e2739169fe0db8c6727f3c17dc79e3846033d62)

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/vala/vala.inc

@@ -3,6 +3,9 @@ DESCRIPTION = "Vala is a C#-like language dedicated to ease GObject programming.
 Vala compiles to plain C and has no runtime environment nor penalities whatsoever."
 SECTION = "devel"
 DEPENDS = "bison-native flex-native libxslt-native glib-2.0"
+
+# vala-native contains a native version of vapigen, which we use instead of the target one
+DEPENDS_append_class-target = " vala-native"
 BBCLASSEXTEND = "native"
 HOMEPAGE = "http://vala-project.org"
 LICENSE = "LGPLv2.1"
@@ -15,3 +18,34 @@ inherit autotools pkgconfig upstream-version-is-even
 
 FILES_${PN} += "${datadir}/${BPN}-${SHRT_VER}/vapi ${libdir}/${BPN}-${SHRT_VER}/"
 FILES_${PN}-doc += "${datadir}/devhelp"
+
+do_configure_prepend_class-target() {
+        # Write out a vapigen wrapper that will be provided by pkg-config file installed in target sysroot
+        # The wrapper will call a native vapigen
+        cat > ${B}/vapigen-wrapper << EOF
+#!/bin/sh
+vapigen-${SHRT_VER} "\$@"
+EOF
+        chmod +x ${B}/vapigen-wrapper
+}
+
+# Vapigen wrapper needs to be available system-wide, because it will be used
+# to build vapi files from all other packages with vala support
+do_install_append_class-target() {
+        install -d ${D}${bindir}/
+        install ${B}/vapigen-wrapper ${D}${bindir}/
+}
+
+
+SYSROOT_PREPROCESS_FUNCS_append_class-target += "vapigen_sysroot_preprocess"
+
+vapigen_sysroot_preprocess() {
+        # Put vapigen wrapper into target sysroot so that it can be used when building vapi files.
+        sysroot_stage_dir ${D}${bindir} ${SYSROOT_DESTDIR}${bindir}
+
+        # Also, tweak the vapigen name in vapigen pkgconfig file, so that it picks up our
+        # wrapper.
+        sed -i \
+           -e "s|vapigen=.*|vapigen=${bindir}/vapigen-wrapper|" \
+           ${SYSROOT_DESTDIR}${datadir}/pkgconfig/vapigen-${SHRT_VER}.pc
+}

meta/recipes-devtools/vala/vala/0001-vapigen.m4-use-PKG_CONFIG_SYSROOT_DIR.patch

@@ -0,0 +1,38 @@
+From dbb1c58e86f2af4613f3ac9571d9b163d4bca675 Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex.kanavin@gmail.com>
+Date: Fri, 23 Oct 2015 16:13:54 +0300
+Subject: [PATCH] vapigen.m4: use $PKG_CONFIG_SYSROOT_DIR
+
+This is necessary in cross-compiling environments, where directories
+returned by pkg-config should be prefixed with sysroot location.
+
+Upstream-Status: Pending [review in oe-core list]
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ vapigen/vapigen.m4 | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/vapigen/vapigen.m4 b/vapigen/vapigen.m4
+index 2c435e7..6228991 100644
+--- a/vapigen/vapigen.m4
++++ b/vapigen/vapigen.m4
+@@ -82,12 +82,12 @@ AC_DEFUN([VAPIGEN_CHECK],
+ 
+   AS_CASE([$enable_vala],
+     [yes], [
+-      VAPIGEN=`$PKG_CONFIG --variable=vapigen $vapigen_pkg_name`
+-      VAPIGEN_MAKEFILE=`$PKG_CONFIG --variable=datadir $vapigen_pkg_name`/vala/Makefile.vapigen
++      VAPIGEN=$PKG_CONFIG_SYSROOT_DIR`$PKG_CONFIG --variable=vapigen $vapigen_pkg_name`
++      VAPIGEN_MAKEFILE=$PKG_CONFIG_SYSROOT_DIR`$PKG_CONFIG --variable=datadir $vapigen_pkg_name`/vala/Makefile.vapigen
+       AS_IF([test "x$2" = "x"], [
+-          VAPIGEN_VAPIDIR=`$PKG_CONFIG --variable=vapidir $vapigen_pkg_name`
++          VAPIGEN_VAPIDIR=$PKG_CONFIG_SYSROOT_DIR`$PKG_CONFIG --variable=vapidir $vapigen_pkg_name`
+         ], [
+-          VAPIGEN_VAPIDIR=`$PKG_CONFIG --variable=vapidir_versioned $vapigen_pkg_name`
++          VAPIGEN_VAPIDIR=$PKG_CONFIG_SYSROOT_DIR`$PKG_CONFIG --variable=vapidir_versioned $vapigen_pkg_name`
+         ])
+     ])
+ 
+-- 
+2.1.4
+

meta/recipes-devtools/vala/vala_0.30.1.bb

@@ -1,6 +1,8 @@
 require ${BPN}.inc
 
-SRC_URI += " file://0001-git-version-gen-don-t-append-dirty-if-we-re-not-in-g.patch"
+SRC_URI += " file://0001-git-version-gen-don-t-append-dirty-if-we-re-not-in-g.patch \
+             file://0001-vapigen.m4-use-PKG_CONFIG_SYSROOT_DIR.patch \
+"
 
 SRC_URI[md5sum] = "cc2eb2384fc10038b643753d734a5a51"
 SRC_URI[sha256sum] = "23add78e5c6a5e6df019d4a885c9c79814c9e0b957519ec8a4f4d826c4e5df2c"