i'm sure i'm missing something obvious, but i'm perusing "include/config_distro_bootcmd.h" for the first time, and i can understand the *principle* behind:
/* * A note on error handling: It is possible for BOOT_TARGET_DEVICES to * reference a device that is not enabled in the U-Boot configuration, e.g. * it may include MMC in the list without CONFIG_CMD_MMC being enabled. Given * that BOOT_TARGET_DEVICES is a macro that's expanded by the C pre-processor * at compile time, it's not possible to detect and report such problems via * a simple #ifdef/#error combination. Still, the code needs to report errors. * The best way I've found to do this is to make BOOT_TARGET_DEVICES expand to * reference a non-existent symbol, and have the name of that symbol encode * the error message. Consequently, this file contains references to e.g. * BOOT_TARGET_DEVICES_references_MMC_without_CONFIG_CMD_MMC. Given the * prevalence of capitals here, this looks like a pre-processor macro and * hence seems like it should be all capitals, but it's really an error * message that includes some other pre-processor symbols in the text. */
but, still, how is that name resolved to the corresponding error message? what am i missing here?
rday