CMake: Add instructions to re-use host artifacts for target builds

We don't want to build the host Qt configuration every single time we
do a cross-build in Coin.
Coin learned some new qt5.git platform configuration options, which
allow specifying a dependency between a host Coin configuration and a
target one.

This means we can specify a host macOS config as a dependency when
building iOS, and the host artifacts for all dependent repos
(qtbase, qtsvg, qtdeclarative, etc) will be installed into
/home/qt/work/install (as specified by the
{{.AgentWorkingDir}}/install location).

Same for Linux + Android and Linux + qemu.

Modify the qtbase Coin instructions to use these installed host
artifacts if such a dependency is present (platformDependency is not
null). The target artifacts will be installed into a subfolder of the
host installation, called 'target', e.g. /home/qt/work/install/target.

If a dependency is not present, continue to build a host Qt before
doing a target build. This allows gradual conversion of configurations
in case if some of them don't work, or if the dependencies.yaml have
not propagated far enough for all new repos to use the new
instructions.
In this case the locations of the artifacts are different
host - /home/qt/work/install/host
target - /home/qt/work/install/target

Task-number: QTBUG-85623
Change-Id: I33539f4376034539fb7db80293dc4d39dcb9539b
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

coin/instructions/cmake_cross_compilation_module_build_instructions.yaml

@@ -6,33 +6,39 @@ instructions:
     directory: build
   - type: ChangeDirectory
     directory: "{{.BuildDir}}/build"
-  - type: MakeDirectory
-    directory: host
   - type: MakeDirectory
     directory: target
-  - type: SetBuildDirectory
-    directory: "{{.SourceDir}}/build/host"
-  - type: ChangeDirectory
-    directory: "{{.BuildDir}}"
-  - type: EnvironmentVariable
-    variableName: COIN_CMAKE_ARGS
-    # The lack of space between the non qtbase configure args and the rest of the args is important!
-    variableValue: "{{.Env.NON_QTBASE_CONFIGURE_ARGS}} -DBUILD_TESTING=OFF {{.SourceDir}}"
-  - !include "{{qt/qtbase}}/call_host_cmake.yaml"
-  - type: ExecuteCommand
-    command: "{{.Env.ENV_PREFIX}} cmake --build . --parallel -v"
-    maxTimeInSeconds: 6000
-    maxTimeBetweenOutput: 1200
-    userMessageOnFailure: >
-      Failed to build sources. In the current state bug can be everywhere.
-  - type: EnvironmentVariable
-    variableName: COIN_CMAKE_INSTALL_SCRIPT_PATH
-    variableValue: "{{.InstallDir}}/host"
-  - !include "{{qt/qtbase}}/call_host_install.yaml"
-  - type: EnvironmentVariable
-    variableName: DESTDIR
-    variableValue: "{{.InstallRoot}}"
-  - !include "{{qt/qtbase}}/call_host_install.yaml"
+  - type: Group
+    instructions:
+      - type: MakeDirectory
+        directory: host
+      - type: SetBuildDirectory
+        directory: "{{.SourceDir}}/build/host"
+      - type: ChangeDirectory
+        directory: "{{.BuildDir}}"
+      - type: EnvironmentVariable
+        variableName: COIN_CMAKE_ARGS
+        # The lack of space between the non qtbase configure args and the rest of the args is important!
+        variableValue: "{{.Env.NON_QTBASE_CONFIGURE_ARGS}} -DBUILD_TESTING=OFF {{.SourceDir}}"
+      - !include "{{qt/qtbase}}/call_host_cmake.yaml"
+      - type: ExecuteCommand
+        command: "{{.Env.ENV_PREFIX}} cmake --build . --parallel -v"
+        maxTimeInSeconds: 6000
+        maxTimeBetweenOutput: 1200
+        userMessageOnFailure: >
+          Failed to build sources. In the current state bug can be everywhere.
+      - type: EnvironmentVariable
+        variableName: COIN_CMAKE_INSTALL_SCRIPT_PATH
+        variableValue: "{{.InstallDir}}/host"
+      - !include "{{qt/qtbase}}/call_host_install.yaml"
+      - type: EnvironmentVariable
+        variableName: DESTDIR
+        variableValue: "{{.InstallRoot}}"
+      - !include "{{qt/qtbase}}/call_host_install.yaml"
+    enable_if:
+      condition: property
+      property: platformDependency
+      equals_value: null
   - type: EnvironmentVariable
     variableName: DESTDIR
     variableValue: ""

coin/instructions/cmake_cross_compilation_qtbase_build_instructions.yaml

@@ -6,35 +6,41 @@ instructions:
     directory: build
   - type: ChangeDirectory
     directory: "{{.BuildDir}}/build"
-  - type: MakeDirectory
-    directory: host
   - type: MakeDirectory
     directory: target
-  - type: SetBuildDirectory
-    directory: "{{.SourceDir}}/build/host"
-  - type: ChangeDirectory
-    directory: "{{.BuildDir}}"
-  - type: ExecuteCommand
-    command: "{{.Env.ENV_PREFIX}} cmake {{.Env.CONFIGURE_ARGS}} -DCMAKE_INSTALL_PREFIX:PATH={{.InstallDir}}/host -DBUILD_TESTING=OFF {{.SourceDir}}"
-    executeCommandArgumentSplitingBehavior: SplitAfterVariableSubstitution
-    maxTimeInSeconds: 6000
-    maxTimeBetweenOutput: 1200
-    userMessageOnFailure: >
-      Failed to call cmake.
-  - type: ExecuteCommand
-    command: "{{.Env.ENV_PREFIX}} cmake --build . --parallel -v"
-    maxTimeInSeconds: 6000
-    maxTimeBetweenOutput: 1200
-    userMessageOnFailure: >
-      Failed to build sources. In the current state bug can be everywhere.
-  - type: EnvironmentVariable
-    variableName: COIN_CMAKE_INSTALL_SCRIPT_PATH
-    variableValue: "{{.BuildDir}}"
-  - !include "{{qt/qtbase}}/call_host_install.yaml"
-  - type: EnvironmentVariable
-    variableName: DESTDIR
-    variableValue: "{{.InstallRoot}}"
-  - !include "{{qt/qtbase}}/call_host_install.yaml"
+  - type: Group
+    instructions:
+      - type: MakeDirectory
+        directory: host
+      - type: SetBuildDirectory
+        directory: "{{.SourceDir}}/build/host"
+      - type: ChangeDirectory
+        directory: "{{.BuildDir}}"
+      - type: ExecuteCommand
+        command: "{{.Env.ENV_PREFIX}} cmake {{.Env.CONFIGURE_ARGS}} -DCMAKE_INSTALL_PREFIX:PATH={{.InstallDir}}/host -DBUILD_TESTING=OFF {{.SourceDir}}"
+        executeCommandArgumentSplitingBehavior: SplitAfterVariableSubstitution
+        maxTimeInSeconds: 6000
+        maxTimeBetweenOutput: 1200
+        userMessageOnFailure: >
+          Failed to call cmake.
+      - type: ExecuteCommand
+        command: "{{.Env.ENV_PREFIX}} cmake --build . --parallel -v"
+        maxTimeInSeconds: 6000
+        maxTimeBetweenOutput: 1200
+        userMessageOnFailure: >
+          Failed to build sources. In the current state bug can be everywhere.
+      - type: EnvironmentVariable
+        variableName: COIN_CMAKE_INSTALL_SCRIPT_PATH
+        variableValue: "{{.BuildDir}}"
+      - !include "{{qt/qtbase}}/call_host_install.yaml"
+      - type: EnvironmentVariable
+        variableName: DESTDIR
+        variableValue: "{{.InstallRoot}}"
+      - !include "{{qt/qtbase}}/call_host_install.yaml"
+    enable_if:
+      condition: property
+      property: platformDependency
+      equals_value: null
   - type: EnvironmentVariable
     variableName: DESTDIR
     variableValue: ""
@@ -42,8 +48,22 @@ instructions:
     directory: "{{.SourceDir}}/build/target"
   - type: ChangeDirectory
     directory: "{{.BuildDir}}"
+  - type: AppendToEnvironmentVariable
+    variableName: TARGET_CONFIGURE_ARGS
+    variableValue: " -DQT_HOST_PATH={{.AgentWorkingDir}}/install"
+    disable_if:
+      condition: property
+      property: platformDependency
+      equals_value: null
+  - type: AppendToEnvironmentVariable
+    variableName: TARGET_CONFIGURE_ARGS
+    variableValue: " -DQT_HOST_PATH={{.InstallDir}}/host"
+    enable_if:
+      condition: property
+      property: platformDependency
+      equals_value: null
   - type: ExecuteCommand
-    command: "{{.Env.TARGET_ENV_PREFIX}} cmake {{.Env.TARGET_CONFIGURE_ARGS}} -DQT_HOST_PATH={{.InstallDir}}/host -DCMAKE_INSTALL_PREFIX:PATH={{.InstallDir}}/target -DBUILD_TESTING=OFF {{.SourceDir}}"
+    command: "{{.Env.TARGET_ENV_PREFIX}} cmake {{.Env.TARGET_CONFIGURE_ARGS}} -DCMAKE_INSTALL_PREFIX:PATH={{.InstallDir}}/target -DBUILD_TESTING=OFF {{.SourceDir}}"
     executeCommandArgumentSplitingBehavior: SplitAfterVariableSubstitution
     maxTimeInSeconds: 6000
     maxTimeBetweenOutput: 1200