feat(cmakev2/test): add simple executable test

Add a simple test_executable that links to all discovered components.
This is intended to verify if the component sources can be compiled
using the command `cmake --build build/ --target test_executable`. The
ldgen is not yet integrated, so the test_executable is not actually
created or linked. However, this process can be used to check if the
components are compiled.

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>

tools/cmakev2/test/CMakeLists.txt

@@ -11,8 +11,11 @@ project(cmakev2
     VERSION 1.2.3
     LANGUAGES C CXX ASM)
 
+add_custom_target(flash)
+
 idf_project_init()
 
+
 # Test component priority
 function(test_component_priority)
     # Set the idf component to be replaced with a testing component of higher
@@ -202,6 +205,12 @@ function(test_include_component)
     endif()
 endfunction()
 
+function(test_executable)
+    add_executable(test_executable components/component1/component1.c)
+    idf_build_library(INTERFACE test_executable_lib)
+    target_link_libraries(test_executable PRIVATE test_executable_lib)
+endfunction()
+
 # Run tests
 test_component_priority()
 test_idf_version()
@@ -211,6 +220,7 @@ test_idf_build_library()
 test_kconfig()
 test_project_properties()
 test_include_component()
+test_executable()
 __dump_all_properties()
 __generate_project_info()