David Woodhouse 841d9664d3 Fix build system to relink when source files change
- Make copy_file_if_changed() return bool indicating if file was copied
- Track sources_changed in copy_src_tree() to detect when source files change
- Only update build_info timestamp when sources/config/version change
- Exclude generated files (build_info_data.h) from sources_changed tracking
- Add build_info_data.h to ignore_targets to prevent copying from resources
- Track changes to generated headers (defines.h, esphome.h, version.h)
- Check for config_hash or version changes to trigger rebuild
- Pretty-print build_info.json with indentation and trailing newline
- Update mock_copy_file_if_changed to return True by default

This fixes the issue where changing a source file would recompile the .o
file but not relink the final program executable.
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2025-07-17 22:40:28 +12:00
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Description
ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
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