coin: Build standalone examples in a separate build directory

Previously configurations with -make examples in their configure args
were building examples as part of the Qt library build. This has some
downsides:
- we don't build examples as a separate project, thus not ensuring
  that we build examples as our users would
- qt cmake deployment api can't be used due to various limitations in
  our tooling

Use the new qtbase instructions to instead build examples as a
separate project in a separate build directory, after Qt is built and
installed. This is similar to how we build standalone tests.

The new instructions are activated by the StandaloneExamples features.
It is opt-in as opposed to standalone tests, so we can disable the
feature in case any regressions happen.

Task-number: QTBUG-90820
Task-number: QTBUG-96232
Change-Id: I71b37b91ed09bcc0797841adf0df84cc0b111fd7
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

coin/platform_configs/cmake_platforms.yaml

@@ -12,7 +12,7 @@ Configurations:
     Id: 'ubuntu-22.04-documentation'
     Template: 'qtci-linux-Ubuntu-22.04-x86_64-51'
     Compiler: 'GCC'
-    Features: ['Sccache', 'Documentation', 'UseConfigure', 'DoNotRunTests']
+    Features: ['Sccache', 'Documentation', 'UseConfigure', 'DoNotRunTests', 'StandaloneExamples']
     Configure arguments: '-make examples -developer-build -c++std c++20 -linker gold -qtlibinfix TestInfix -qtnamespace TestNamespace'
     Environment variables: ['NON_QTBASE_CMAKE_ARGS=-DFFMPEG_DIR={{.Env.FFMPEG_DIR}} -DQT_DEPLOY_FFMPEG=TRUE']
 -
@@ -43,7 +43,7 @@ Configurations:
     Id: 'ubuntu-24.04-arm64-documentation'
     Template: 'qtci-linux-Ubuntu-24.04-aarch64-50'
     Compiler: 'GCC'
-    Features: ['Documentation', 'UseConfigure', 'DoNotRunTests']
+    Features: ['Documentation', 'UseConfigure', 'DoNotRunTests', 'StandaloneExamples']
     Configure arguments: '-make examples -developer-build -c++std c++20 -linker gold -qtlibinfix TestInfix -qtnamespace TestNamespace -qpa offscreen\;xcb'
     Environment variables: ['NON_QTBASE_CMAKE_ARGS=-DFFMPEG_DIR={{.Env.FFMPEG_DIR}}']
 -
@@ -73,7 +73,7 @@ Configurations:
     Id: 'ubuntu-24.04-x64-documentation'
     Template: 'qtci-linux-Ubuntu-24.04-x86_64-50'
     Compiler: 'GCC'
-    Features: ['Sccache', 'Documentation', 'UseConfigure', 'DoNotRunTests']
+    Features: ['Sccache', 'Documentation', 'UseConfigure', 'DoNotRunTests', 'StandaloneExamples']
     Configure arguments: '-make examples -developer-build -c++std c++20 -linker gold -qtlibinfix TestInfix -qtnamespace TestNamespace'
     Environment variables: ['NON_QTBASE_CMAKE_ARGS=-DFFMPEG_DIR={{.Env.FFMPEG_DIR}} -DQT_DEPLOY_FFMPEG=TRUE']
 -
@@ -241,7 +241,7 @@ Configurations:
     Id: 'windows-11_23H2-mingw13-developer-build'
     Template: 'qtci-windows-11_23H2-x86_64-52'
     Compiler: 'Mingw'
-    Features: ['Sccache', 'WarningsAreErrors', 'UseConfigure']
+    Features: ['Sccache', 'WarningsAreErrors', 'UseConfigure', 'StandaloneExamples']
     Configure arguments: '-developer-build -release -force-debug-info -separate-debug-info -make examples'
     Environment variables: [
         'Path={{.Env.MINGW_PATH}}\bin;{{.Env.Path}}',

coin/platform_configs/cmake_platforms_qemu.yaml

@@ -7,7 +7,7 @@ Configurations:
     Target arch: 'armv7'
     Compiler: 'GCC'
     Platform dependency: 'ubuntu-22.04'
-    Features: ['Sccache', 'UseConfigure', 'Insignificant']
+    Features: ['Sccache', 'UseConfigure', 'Insignificant', 'StandaloneExamples']
     Environment variables: [
         'TARGET_CONFIGURE_ARGS=-release -force-debug-info -developer-build -no-warnings-are-errors -make examples -qt-harfbuzz -device linux-imx7-g++ -device-option "CROSS_COMPILE={{.Env.QEMUARMV7_TOOLCHAIN_CROSS_COMPILE}}" -device-option "DISTRO_OPTS=hard-float boot2qt" -no-feature-forkfd_pidfd',
         'TARGET_CMAKE_ARGS=-DCMAKE_TOOLCHAIN_FILE={{.Env.QEMUARMV7_TOOLCHAIN_FILE}} -DQT_FORCE_BUILD_TOOLS=ON',

coin/platform_configs/macos.yaml

@@ -114,7 +114,7 @@ Configurations:
         Id: 'macos-14-x86_64-developer-build'
         Template: 'qtci-macos-14-x86_64-105'
         Compiler: 'Clang'
-        Features: ['Sccache', 'DoNotRunTests', 'WarningsAreErrors', 'UseConfigure']
+        Features: ['Sccache', 'DoNotRunTests', 'WarningsAreErrors', 'UseConfigure', 'StandaloneExamples']
         Configure arguments: '-developer-build -release -force-debug-info -no-pch -no-framework -qtnamespace TestNamespace -make examples'
         Environment variables: [
             'CMAKE_ARGS=-DOPENSSL_ROOT_DIR={{.Env.OPENSSL_DIR}}',

coin/platform_configs/nightly_ubuntu_22_04_xwayland.yaml

@@ -4,7 +4,7 @@ Configurations:
     # cmake_platforms.yaml
     Template: 'qtci-linux-Ubuntu-22.04-x86_64-50'
     Compiler: 'GCC'
-    Features: ['Sccache', 'Documentation', 'TestDocs', 'UseConfigure']
+    Features: ['Sccache', 'Documentation', 'TestDocs', 'UseConfigure', 'StandaloneExamples']
     Configure arguments: '-make examples -developer-build -c++std c++20 -qtlibinfix TestInfix -qtnamespace TestNamespace'
 -
     Id: 'Ubuntu-22.04-xwayland-host'