build system: generate the partition table by default for linux target

This fixes the issue that "idf.py partition-table" had to be run
manually in order for the partition table to be generated, when
building for linux target.

components/esp_partition/host_test/partition_api_test/CMakeLists.txt

@@ -7,5 +7,3 @@ set(COMPONENTS main)
 list(APPEND EXTRA_COMPONENT_DIRS "$ENV{IDF_PATH}/tools/mocks/freertos/")
 
 project(partition_api_test)
-
-add_dependencies(partition_api_test.elf partition-table)

components/esp_partition/host_test/partition_api_test/README.md

@@ -8,9 +8,8 @@ Source the IDF environment as usual.
 
 Once this is done, build the application:
 ```bash
-idf.py build partition-table
+idf.py build
 ```
-Note that for the time being, `partition-table` target needs to be built manually.
 
 # Run
 ```bash

components/nvs_flash/host_test/nvs_host_test/CMakeLists.txt

@@ -8,5 +8,3 @@ set(COMPONENTS main)
 list(APPEND EXTRA_COMPONENT_DIRS "$ENV{IDF_PATH}/tools/mocks/freertos/")
 
 project(nvs_host_test)
-
-add_dependencies(nvs_host_test.elf partition-table)

components/partition_table/CMakeLists.txt

@@ -96,6 +96,24 @@ else()
         "Either change partition table in menuconfig or create this input file.")
 endif()
 
+if(${target} STREQUAL "linux" AND EXISTS ${partition_csv})
+    # partition-table target is normally invoked as a dependency of 'flash' target.
+    # However, when building for "linux" target, 'flash' target doesn't exist,
+    # so we need to attach the partition table build to the executable target.
+    #
+    # The problem is that the executable target is not yet defined
+    # when the component CMakeLists.txt file is evaluated, so we
+    # can only get it as a generator expression. But generator expressions
+    # can't be used in 'add_dependencies':
+    # https://gitlab.kitware.com/cmake/cmake/-/issues/19467
+    #
+    # Therefore attach partition-table to the internal __idf_build_target
+    # target. This is a hack, since that target name is an implementation detail
+    # of the build system.
+
+    add_dependencies(__idf_build_target partition-table)
+endif()
+
 # Add signing steps
 if(CONFIG_SECURE_SIGNED_APPS_ECDSA_SCHEME)
     if(CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES)

components/spiffs/host_test/CMakeLists.txt

@@ -22,4 +22,5 @@ set_property(
     DIRECTORY
     APPEND PROPERTY ADDITIONAL_CLEAN_FILES "../image.bin")
 
-add_dependencies(host_test_spiffs.elf partition-table image.bin)
+
+add_dependencies(host_test_spiffs.elf image.bin)