cmake-qemu.bbclass: make it more usable

Make the cmake-qemu.bbclass more usable:
- Drop the CMAKE_EXEWRAPPER_ENABLED variable (which does not make much
  sense without the second commit of the original patch series).
- Inherit qemu to make the cmake-qemu a drop in replacement for cmake.

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes-recipe/cmake-qemu.bbclass b/meta/classes-recipe/cmake-qemu.bbclass
index 76b748f340688c298c9e881445f5b6f7a598b63f..46a89e2827be418872155aa74ce6f9b9c4fda923 100644 (file)
--- a/meta/classes-recipe/cmake-qemu.bbclass
+++ b/meta/classes-recipe/cmake-qemu.bbclass
@@ -5,18 +5,22 @@
 #
 # Not all platforms are supported by Qemu. Using qemu-user therefore
 # involves a certain risk, which is also the reason why this feature
-# is not activated by default.
+# is not part of the main cmake class by default.
+#
+# One use case is the execution of cross-compiled unit tests with CTest
+# on the build machine. If CMAKE_EXEWRAPPER_ENABLED is configured,
+#   cmake --build --target test
+# works transparently with qemu-user. If the cmake project is developed
+# with this use case in mind this works very nicely also out of an IDE
+# configured to use cmake-native for cross compiling.
 
-inherit qemu
+inherit qemu cmake
 
-CMAKE_EXEWRAPPER_ENABLED:class-native = "False"
-CMAKE_EXEWRAPPER_ENABLED:class-nativesdk = "False"
-CMAKE_EXEWRAPPER_ENABLED ?= "${@bb.utils.contains('MACHINE_FEATURES', 'qemu-usermode', 'True', 'False', d)}"
-DEPENDS:append = "${@' qemu-native' if d.getVar('CMAKE_EXEWRAPPER_ENABLED') == 'True' else ''}"
+DEPENDS:append:class-target = "${@' qemu-native' if bb.utils.contains('MACHINE_FEATURES', 'qemu-usermode', True, False, d) else ''}"
 
 cmake_do_generate_toolchain_file:append:class-target() {
-    if [ "${CMAKE_EXEWRAPPER_ENABLED}" = "True" ]; then
-        # Write out a qemu wrapper that will be used as exe_wrapper so that camake
+    if [ "${@bb.utils.contains('MACHINE_FEATURES', 'qemu-usermode', 'True', 'False', d)}" ]; then
+        # Write out a qemu wrapper that will be used as exe_wrapper so that cmake
         # can run target helper binaries through that. This also allows to execute ctest.
         qemu_binary="${@qemu_wrapper_cmdline(d, '${STAGING_DIR_HOST}', ['${STAGING_DIR_HOST}/${libdir}','${STAGING_DIR_HOST}/${base_libdir}'])}"
         echo "#!/bin/sh" > "${WORKDIR}/cmake-qemuwrapper"