Esp-idf: CMAKE Build fails on component folder (IDFGH-1178)

[bmakovecki]

Environment

• Development Kit: ESP32-DevKitC
• IDF version : v4.0-dev-546-gad3b820e7
• Build System: CMake
• Compiler version: xtensa-esp32-elf-gcc (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a5) 5.2.0
• Operating System: Windows
• Project to build: nvs_value_test.zip

Problem Description

Build process fails during compilation:
In file included from ../components/test/test.cpp:1:0:
../components/test/include/test.h:3:17: fatal error: nvs.h: No such file or directory

Expected Behavior

Build successful. Same as building with make.

Steps to reproduce

1. idf.py build => fails
2. make app => succeed

Code to reproduce this issue

nvs_value_test.zip

[projectgus]

Hi @bmakovecki,

In the CMake build system, components need to declare their dependencies (apart from some common dependencies).

If you add this line before register_component() in component/test/CMakeLists.txt, it will build:

```
set(COMPONENT_REQUIRES nvs_flash)
````

(Note: There is also COMPONENT_PRIV_REQUIRES if a header is only used to build the component, but not needed to include that component's public headers. Full details here: https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system-cmake.html#when-writing-a-component

[TimeWarDoctor]

Made a copy of esp-idf\components\esp-eth and named the folder ethernet and it would build.