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serial: CONFIG_USB_CDC_ACM adds file to library

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It is possible to use the UART abstraction for USB communications
without any of the dedicated UART drivers being enabled. This currently
causes a compilation error because CMake throws an error if a library
has no sources. The empty file forces there to be at least one file in
the library when `CONFIG_USB_CDC_ACM` is enabled.

Removing `select CONFIG_SERIAL_HAS_DRIVER` from `CONFIG_USB_CDC_ACM` is
not a valid solution as this symbol is required by `CONFIG_UART_CONSOLE`
and therefore `USB_UART_CONSOLE`.

Fixes #31067.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This commit is contained in:
Jordan Yates 2021-01-01 15:25:38 +10:00 • committed by Carles Cufí
commit 8e2b2fe595
1 changed files with 1 additions and 0 deletions
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drivers/serial/CMakeLists.txt
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@ -36,6 +36,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_XLNX_UARTLITE uart_xlnx_uartlite.c)
zephyr_library_sources_ifdef(CONFIG_UART_XMC4XXX uart_xmc4xxx.c)
zephyr_library_sources_ifdef(CONFIG_UART_NPCX uart_npcx.c)
zephyr_library_sources_ifdef(CONFIG_UART_APBUART uart_apbuart.c)
zephyr_library_sources_ifdef(CONFIG_USB_CDC_ACM ${ZEPHYR_BASE}/misc/empty_file.c)
zephyr_library_sources_ifdef(CONFIG_USERSPACE uart_handlers.c)