package/opencv4: propagate internal dependencies

Commit e22994378553 (package/opencv4: BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
requires BR2_PACKAGE_OPENCV4_LIB_DNN) forgot to propagate the dependency
to the internal stitching option, and to the contrib options dpm, face,
and xobjdetect, causing unmet dependencies warning (unfortunately, not
errors) such as:

    $ KCONFIG_SEED=0x9F66F854 make randconfig
    WARNING: unmet direct dependencies detected for BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
      Depends on [n]: BR2_PACKAGE_OPENCV4 [=y] && !BR2_TOOLCHAIN_USES_UCLIBC [=y] && BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS [=y]
      Selected by [y]:
      - BR2_PACKAGE_OPENCV4_LIB_STITCHING [=y] && BR2_PACKAGE_OPENCV4 [=y]
      - BR2_PACKAGE_OPENCV4_CONTRIB_LIB_XOBJDETECT [=y] && BR2_PACKAGE_OPENCV4_CONTRIB [=y]

Propagate the dependencies.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Woodrow Douglass <wdouglass@carnegierobotics.com>
Cc: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit b553c9123b9fff5e7a97c19668bee20b15c1d736)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/opencv4-contrib/Config.in

@@ -95,18 +95,30 @@ config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_DNNS_EASILY_FOOLED
 
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_DPM
 	bool "dpm"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # opencv4 objdetect
+	depends on !BR2_TOOLCHAIN_USES_UCLIBC # opencv4 objdetect
 	select BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
 	help
 	  Deformable Part Model -- Felzenszwalb's Cascade with
 	  deformable parts object recognition code.
 
+comment "dpm needs a glibc or musl toolchain"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # opencv4 objdetect
+	depends on BR2_TOOLCHAIN_USES_UCLIBC # opencv4 objdetect
+
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_FACE
 	bool "face"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # opencv4 objdetect
+	depends on !BR2_TOOLCHAIN_USES_UCLIBC # opencv4 objdetect
 	select BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
 	help
 	  Face Recognition -- Face recognition techniques: Eigen, Fisher
 	  and Local Binary Pattern Histograms LBPH methods.
 
+comment "face needs a glibc or musl toolchain"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # opencv4 objdetect
+	depends on BR2_TOOLCHAIN_USES_UCLIBC # opencv4 objdetect
+
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_FREETYPE
 	bool "freetype"
 	help
@@ -317,12 +329,18 @@ config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_XIMGPROC
 
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_XOBJDETECT
 	bool "xobjdetect"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # opencv4 objdetect
+	depends on !BR2_TOOLCHAIN_USES_UCLIBC # opencv4 objdetect
 	select BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
 	help
 	  Boosted 2D Object Detection -- Uses a Waldboost cascade and
 	  local binary patterns computed as integral features for 2D
 	  object detection.
 
+comment "xobjdetect needs a glibc or musl toolchain"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # opencv4 objdetect
+	depends on BR2_TOOLCHAIN_USES_UCLIBC # opencv4 objdetect
+
 config BR2_PACKAGE_OPENCV4_CONTRIB_LIB_XPHOTO
 	bool "xphoto"
 	select BR2_PACKAGE_OPENCV4_LIB_PHOTO

package/opencv4/Config.in

@@ -201,6 +201,8 @@ config BR2_PACKAGE_OPENCV4_LIB_SHAPE
 
 config BR2_PACKAGE_OPENCV4_LIB_STITCHING
 	bool "stitching"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # objdetect
+	depends on !BR2_TOOLCHAIN_USES_UCLIBC # objdetect
 	select BR2_PACKAGE_OPENCV4_LIB_CALIB3D
 	select BR2_PACKAGE_OPENCV4_LIB_FEATURES2D
 	select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
@@ -209,6 +211,10 @@ config BR2_PACKAGE_OPENCV4_LIB_STITCHING
 	  Include opencv_stitching (images stitching) module into the
 	  OpenCV build.
 
+comment "stitching needs a glibc or musl toolchain"
+	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_USES_UCLIBC
+
 config BR2_PACKAGE_OPENCV4_LIB_SUPERRES
 	bool "superres"
 	select BR2_PACKAGE_OPENCV4_LIB_IMGPROC