[host dependencies] add support in the scripts (#16627)

This contains all the docs and scripts changes from #16479,
without any of the ports changes, for easier CR

6 files changed, 35 insertions, 13 deletions

diff --git a/scripts/buildsystems/msbuild/vcpkg-general.xml b/scripts/buildsystems/msbuild/vcpkg-general.xml
index 49865e74e..5c84aa0da 100644
--- a/scripts/buildsystems/msbuild/vcpkg-general.xml
+++ b/scripts/buildsystems/msbuild/vcpkg-general.xml
@@ -65,6 +65,9 @@
   <StringProperty Name="VcpkgTriplet" DisplayName="Triplet" Category="Conditional" Subtype="Text"
                   Description="Specifies the triplet used by Vcpkg. Does not include the '-static' suffix that may be added by the 'Use static libraries' flag." />
 
+  <StringProperty Name="VcpkgHostTriplet" DisplayName="Host Triplet" Category="Conditional" Subtype="Text"
+                  Description="Specifies the host triplet used by Vcpkg. If empty, this will be automatically determined." />
+
   <StringProperty Name="VcpkgAdditionalInstallOptions" DisplayName="Additional Options" Category="General" Subtype="Text"
                   Description="Additional command line options to be passed to the underlying vcpkg tool when installing in manifest mode." />
 
diff --git a/scripts/buildsystems/msbuild/vcpkg.targets b/scripts/buildsystems/msbuild/vcpkg.targets
index 074d35d90..b99011324 100644
--- a/scripts/buildsystems/msbuild/vcpkg.targets
+++ b/scripts/buildsystems/msbuild/vcpkg.targets
@@ -30,6 +30,10 @@
 
     <VcpkgConfigSubdir Condition="'$(VcpkgNormalizedConfiguration)' == 'Debug'">debug\</VcpkgConfigSubdir>
     <VcpkgApplocalDeps Condition="'$(VcpkgApplocalDeps)' == ''">true</VcpkgApplocalDeps>
+
+    <_ZVcpkgHostTripletParameter Condition="'$(VcpkgHostTriplet)' != ''">"--host-triplet=$(VcpkgHostTriplet)"</_ZVcpkgHostTripletParameter>
+    <_ZVcpkgExecutable>$([System.IO.Path]::Combine($(VcpkgRoot), 'vcpkg.exe'))</_ZVcpkgExecutable>
+
     <ProjectStateLine>VcpkgTriplet=$(VcpkgTriplet):$(ProjectStateLine)</ProjectStateLine>
   </PropertyGroup>
 
@@ -77,7 +81,7 @@
   <Target Name="VcpkgInstallManifestDependencies" BeforeTargets="ClCompile"
           Condition="'$(VcpkgEnabled)' == 'true' and '$(VcpkgEnableManifest)' == 'true' and '$(VcpkgManifestInstall)' == 'true'"
           Inputs="@(_ZVcpkgInstallManifestDependenciesInputs)"
-          Outputs="$(TLogLocation)VcpkgInstallManifest$(VcpkgTriplet).read.1u.tlog;$(VcpkgInstalledDir).msbuildstamp-$(VcpkgTriplet)">
+          Outputs="$(TLogLocation)VcpkgInstallManifest$(VcpkgTriplet).read.1u.tlog;$(VcpkgInstalledDir).msbuildstamp-$(VcpkgTriplet).$(VcpkgHostTriplet).stamp">
     <Message Text="Installing vcpkg dependencies to $(VcpkgInstalledDir)" Importance="High" />
     <MakeDir Directories="$(TLogLocation)" />
     <ItemGroup>
@@ -85,15 +89,15 @@
       <_VcpkgItemToDelete Include="$(VcpkgInstalledDir).msbuildstamp-*" />
     </ItemGroup>
     <Delete Files="@(_VcpkgItemToDelete)" />
-    <Message Text="%22$([System.IO.Path]::Combine($(VcpkgRoot), 'vcpkg.exe'))%22 install --x-wait-for-lock --triplet %22$(VcpkgTriplet)%22 --vcpkg-root %22$(VcpkgRoot)\%22 %22--x-manifest-root=$(VcpkgManifestRoot)\%22 %22--x-install-root=$(VcpkgInstalledDir)\%22 $(VcpkgAdditionalInstallOptions)"
+    <Message Text="%22$(_ZVcpkgExecutable)%22 install $(_ZVcpkgHostTripletParameter) --x-wait-for-lock --triplet %22$(VcpkgTriplet)%22 --vcpkg-root %22$(VcpkgRoot)\%22 %22--x-manifest-root=$(VcpkgManifestRoot)\%22 %22--x-install-root=$(VcpkgInstalledDir)\%22 $(VcpkgAdditionalInstallOptions)"
           Importance="High" />
-    <Exec Command="%22$([System.IO.Path]::Combine($(VcpkgRoot), 'vcpkg.exe'))%22 install --x-wait-for-lock --triplet %22$(VcpkgTriplet)%22 --vcpkg-root %22$(VcpkgRoot)\%22 %22--x-manifest-root=$(VcpkgManifestRoot)\%22 %22--x-install-root=$(VcpkgInstalledDir)\%22 $(VcpkgAdditionalInstallOptions)"
+    <Exec Command="%22$(_ZVcpkgExecutable)%22 install $(_ZVcpkgHostTripletParameter) --x-wait-for-lock --triplet %22$(VcpkgTriplet)%22 --vcpkg-root %22$(VcpkgRoot)\%22 %22--x-manifest-root=$(VcpkgManifestRoot)\%22 %22--x-install-root=$(VcpkgInstalledDir)\%22 $(VcpkgAdditionalInstallOptions)"
           StandardOutputImportance="High" />
-    <WriteLinesToFile File="$(TLogLocation)VcpkgInstallManifest$(VcpkgTriplet).read.1u.tlog"
+    <WriteLinesToFile File="$(TLogLocation)VcpkgInstallManifest$(VcpkgTriplet).$(VcpkgHostTriplet).read.1u.tlog"
                       Lines="@(_VcpkgInstallManifestDependenciesInputs -> '^%(Identity)')"
                       Encoding="Unicode"
                       Overwrite="true"/>
-    <Touch Files="$(VcpkgInstalledDir).msbuildstamp-$(VcpkgTriplet)" AlwaysCreate="true" />
+    <Touch Files="$(VcpkgInstalledDir).msbuildstamp-$(VcpkgTriplet).$(VcpkgHostTriplet).stamp" AlwaysCreate="true" />
 
     <CreateProperty Value="false">
       <Output TaskParameter="ValueSetByTask" PropertyName="Link_MinimalRebuildFromTracking" />
diff --git a/scripts/buildsystems/vcpkg.cmake b/scripts/buildsystems/vcpkg.cmake
index c830644e9..9bdf6573e 100644
--- a/scripts/buildsystems/vcpkg.cmake
+++ b/scripts/buildsystems/vcpkg.cmake
@@ -578,6 +578,11 @@ if(VCPKG_MANIFEST_MODE AND VCPKG_MANIFEST_INSTALL AND NOT Z_VCPKG_CMAKE_IN_TRY_C
         message(STATUS "Running vcpkg install")
 
         set(Z_VCPKG_ADDITIONAL_MANIFEST_PARAMS)
+
+        if(DEFINED VCPKG_HOST_TRIPLET AND NOT VCPKG_HOST_TRIPLET STREQUAL "")
+            list(APPEND Z_VCPKG_ADDITIONAL_MANIFEST_PARAMS "--host-triplet=${VCPKG_HOST_TRIPLET}")
+        endif()
+
         if(VCPKG_OVERLAY_PORTS)
             foreach(Z_VCPKG_OVERLAY_PORT IN LISTS VCPKG_OVERLAY_PORTS)
                 list(APPEND Z_VCPKG_ADDITIONAL_MANIFEST_PARAMS "--overlay-ports=${Z_VCPKG_OVERLAY_PORT}")
diff --git a/scripts/cmake/vcpkg_common_definitions.cmake b/scripts/cmake/vcpkg_common_definitions.cmake
index 897d30832..b505f3693 100644
--- a/scripts/cmake/vcpkg_common_definitions.cmake
+++ b/scripts/cmake/vcpkg_common_definitions.cmake
@@ -18,6 +18,10 @@ VCPKG_TARGET_IMPORT_LIBRARY_SUFFIX       import library suffix for target (same
 VCPKG_FIND_LIBRARY_PREFIXES              target dependent prefixes used for find_library calls in portfiles
 VCPKG_FIND_LIBRARY_SUFFIXES              target dependent suffixes used for find_library calls in portfiles
 VCPKG_SYSTEM_LIBRARIES                   list of libraries are provide by the toolchain and are not managed by vcpkg
+TARGET_TRIPLET                           the name of the current triplet to build for
+CURRENT_INSTALLED_DIR                    the absolute path to the installed files for the current triplet
+HOST_TRIPLET                             the name of the triplet corresponding to the host
+CURRENT_HOST_INSTALLED_DIR               the absolute path to the installed files for the host triplet
 ```
 
 CMAKE_STATIC_LIBRARY_(PREFIX|SUFFIX), CMAKE_SHARED_LIBRARY_(PREFIX|SUFFIX) and CMAKE_IMPORT_LIBRARY_(PREFIX|SUFFIX) are defined for the target
diff --git a/scripts/ports.cmake b/scripts/ports.cmake
index 62ee9f6aa..4adb48149 100644
--- a/scripts/ports.cmake
+++ b/scripts/ports.cmake
@@ -79,6 +79,9 @@ if(CMD MATCHES "^BUILD$")
         endforeach()
     endif()
 
+    set(HOST_TRIPLET "${_HOST_TRIPLET}")
+    set(CURRENT_HOST_INSTALLED_DIR "${_VCPKG_INSTALLED_DIR}/${HOST_TRIPLET}" CACHE PATH "Location to install final packages for the host")
+
     set(TRIPLET_SYSTEM_ARCH "${VCPKG_TARGET_ARCHITECTURE}")
     include("${SCRIPTS}/cmake/vcpkg_common_definitions.cmake")
     include("${SCRIPTS}/cmake/execute_process.cmake")
diff --git a/scripts/vcpkg.schema.json b/scripts/vcpkg.schema.json
index c485aa415..215f5dd9c 100644
--- a/scripts/vcpkg.schema.json
+++ b/scripts/vcpkg.schema.json
@@ -128,6 +128,10 @@
             "$ref": "#/definitions/identifier"
           }
         },
+        "host": {
+          "type": "boolean",
+          "default": false
+        },
         "default-features": {
           "type": "boolean",
           "default": true
@@ -190,9 +194,6 @@
       "description": "A package feature that can be activated by consumers.",
       "type": "object",
       "properties": {
-        "name": {
-          "$ref": "#/definitions/identifier"
-        },
         "description": {
           "$ref": "#/definitions/description-field"
         },
@@ -208,7 +209,6 @@
         "^\\$": {}
       },
       "required": [
-        "name",
         "description"
       ],
       "additionalProperties": false
@@ -279,10 +279,13 @@
           }
         },
         "features": {
-          "description": "An array of features supported by the package",
-          "type": "array",
-          "items": {
-            "$ref": "#/definitions/feature"
+          "description": "An object of features supported by the package",
+          "type": "object",
+          "patternProperties": {
+            "^\\$": {},
+            "^[a-z-]+": {
+              "$ref": "#/definitions/feature"
+            }
           }
         },
         "default-features": {